pioneer file type cd receiver - xr-a700 doesn't spin disc

[go]

hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay. it
plays cd correctly for first 5-10 seconds, after that, noise comes up,
and music get less noticeable. within about 40 seconds, both music
ang noise are gone, the player seems can not find the disc anymore!
so i decided to open it up, try to clean the laser lens, after this,
the player doesn't recognize any cds, i can see the laser head up and
down twice, then it ejects the disc. the cd just doesn't spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I need to
adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[Mark D. Zacharias]

The most common items on recent pioneers have been spindle motors, pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without too much
trouble, but on a problem such as this a do-it-yourself-er is really just
shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...

hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay. it
plays cd correctly for first 5-10 seconds, after that, noise comes up,
and music get less noticeable. within about 40 seconds, both music
ang noise are gone, the player seems can not find the disc anymore!
so i decided to open it up, try to clean the laser lens, after this,
the player doesn't recognize any cds, i can see the laser head up and
down twice, then it ejects the disc. the cd just doesn't spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I need to
adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[go77306]

It appears the spindle motor works - since the music came out for about
30 seconds.

The pickup is the thing move the laser lens back and forth? if that is
the pickup, probably this is the problem - my theory is, it only plays a
few seconds, for the first few seconds, the lens bed doesn't need to
move too much to the back (or just no need to move), as time goes on,
the lens needs to be moved a little bit back in order to keep focusing
on the track, since something wrong with the pickup (motor or track,
etc), the lens bed is still in the original place, so it lose the focus.
what do you think?

btw, how to test if a motor is good? how much voltage should I use to
test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out myself.

Thanks!


Mark D. Zacharias wrote:

The most common items on recent pioneers have been spindle motors, pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without too much
trouble, but on a problem such as this a do-it-yourself-er is really just
shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...

hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay. it
plays cd correctly for first 5-10 seconds, after that, noise comes up,
and music get less noticeable. within about 40 seconds, both music
ang noise are gone, the player seems can not find the disc anymore!
so i decided to open it up, try to clean the laser lens, after this,
the player doesn't recognize any cds, i can see the laser head up and
down twice, then it ejects the disc. the cd just doesn't spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I need to
adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[go77306]

finally I took the pickup out of the changer, I know why the lens bed
cannot move back and forth - one of the plastic gear wheel is bad, it is
not broken, but it can not roate freely. where can I find a replacement?

BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer parts
if I want to replace the pickup?

Thanks


go77306 wrote:

It appears the spindle motor works - since the music came out for about
30 seconds.

The pickup is the thing move the laser lens back and forth? if that is
the pickup, probably this is the problem - my theory is, it only plays a
few seconds, for the first few seconds, the lens bed doesn't need to
move too much to the back (or just no need to move), as time goes on,
the lens needs to be moved a little bit back in order to keep focusing
on the track, since something wrong with the pickup (motor or track,
etc), the lens bed is still in the original place, so it lose the focus.
what do you think?

btw, how to test if a motor is good? how much voltage should I use to
test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out myself.

Thanks!


Mark D. Zacharias wrote:

The most common items on recent pioneers have been spindle motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without too
much
trouble, but on a problem such as this a do-it-yourself-er is really just
shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...

hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay. it
plays cd correctly for first 5-10 seconds, after that, noise comes up,
and music get less noticeable. within about 40 seconds, both music
ang noise are gone, the player seems can not find the disc anymore!
so i decided to open it up, try to clean the laser lens, after this,
the player doesn't recognize any cds, i can see the laser head up and
down twice, then it ejects the disc. the cd just doesn't spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I need to
adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[Mark D. Zacharias]

Only Pioneer parts would work. Besides, replacing the pickup would introduce
a whole new set of variables.

There's no good reason why a conventional circular plastic gear would have
this problem unless the teeth are chewed, which can be seen pretty easily.

The pickup usually has a spring-loaded rack-gear. I think I'd look closely
at that. May just have slipped a tooth or something.


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:g%fvb.130661$HoK.20926@news01.bloor.is.net.cable.rogers.com...

finally I took the pickup out of the changer, I know why the lens bed
cannot move back and forth - one of the plastic gear wheel is bad, it is
not broken, but it can not roate freely. where can I find a replacement?

BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer parts
if I want to replace the pickup?

Thanks


go77306 wrote:
It appears the spindle motor works - since the music came out for about
30 seconds.

The pickup is the thing move the laser lens back and forth? if that is
the pickup, probably this is the problem - my theory is, it only plays a
few seconds, for the first few seconds, the lens bed doesn't need to
move too much to the back (or just no need to move), as time goes on,
the lens needs to be moved a little bit back in order to keep focusing
on the track, since something wrong with the pickup (motor or track,
etc), the lens bed is still in the original place, so it lose the focus.
what do you think?

btw, how to test if a motor is good? how much voltage should I use to
test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out myself.

Thanks!


Mark D. Zacharias wrote:

The most common items on recent pioneers have been spindle motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without too
much
trouble, but on a problem such as this a do-it-yourself-er is really
just
shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and
spam
have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...

hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay. it
plays cd correctly for first 5-10 seconds, after that, noise comes up,
and music get less noticeable. within about 40 seconds, both music
ang noise are gone, the player seems can not find the disc anymore!
so i decided to open it up, try to clean the laser lens, after this,
the player doesn't recognize any cds, i can see the laser head up and
down twice, then it ejects the disc. the cd just doesn't spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I need to
adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[go77306]

Yes, few teeth are chewed... it has two set of gears, the upper set is
big, the lower set is small, few teeth on the upper set are chewed.. I
think I can use kenife to fix the upper teeth, even remove the bad
teeth, since the lower set would work also, right?

thanks


Mark D. Zacharias wrote:

Only Pioneer parts would work. Besides, replacing the pickup would introduce
a whole new set of variables.

There's no good reason why a conventional circular plastic gear would have
this problem unless the teeth are chewed, which can be seen pretty easily.

The pickup usually has a spring-loaded rack-gear. I think I'd look closely
at that. May just have slipped a tooth or something.


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:g%fvb.130661$HoK.20926@news01.bloor.is.net.cable.rogers.com...

finally I took the pickup out of the changer, I know why the lens bed
cannot move back and forth - one of the plastic gear wheel is bad, it is
not broken, but it can not roate freely. where can I find a replacement?

BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer parts
if I want to replace the pickup?

Thanks


go77306 wrote:

It appears the spindle motor works - since the music came out for about
30 seconds.

The pickup is the thing move the laser lens back and forth? if that is
the pickup, probably this is the problem - my theory is, it only plays a
few seconds, for the first few seconds, the lens bed doesn't need to
move too much to the back (or just no need to move), as time goes on,
the lens needs to be moved a little bit back in order to keep focusing
on the track, since something wrong with the pickup (motor or track,
etc), the lens bed is still in the original place, so it lose the focus.
what do you think?

btw, how to test if a motor is good? how much voltage should I use to
test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out myself.

Thanks!


Mark D. Zacharias wrote:


The most common items on recent pioneers have been spindle motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without too
much
trouble, but on a problem such as this a do-it-yourself-er is really

just

shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and

spam

have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...


hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay. it
plays cd correctly for first 5-10 seconds, after that, noise comes up,
and music get less noticeable. within about 40 seconds, both music
ang noise are gone, the player seems can not find the disc anymore!
so i decided to open it up, try to clean the laser lens, after this,
the player doesn't recognize any cds, i can see the laser head up and
down twice, then it ejects the disc. the cd just doesn't spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I need to
adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[Mark D. Zacharias]

Well, I'm not picturing it exactly, but I'm familiar with Pioneer mechanisms
of the past few years.
I'll see if I can look up the gears.

mz



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:agnvb.173$IC%1.4@twister01.bloor.is.net.cable.rogers.com...

Yes, few teeth are chewed... it has two set of gears, the upper set is
big, the lower set is small, few teeth on the upper set are chewed.. I
think I can use kenife to fix the upper teeth, even remove the bad
teeth, since the lower set would work also, right?

thanks


Mark D. Zacharias wrote:

Only Pioneer parts would work. Besides, replacing the pickup would
introduce
a whole new set of variables.

There's no good reason why a conventional circular plastic gear would
have
this problem unless the teeth are chewed, which can be seen pretty
easily.

The pickup usually has a spring-loaded rack-gear. I think I'd look
closely
at that. May just have slipped a tooth or something.


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:g%fvb.130661$HoK.20926@news01.bloor.is.net.cable.rogers.com...

finally I took the pickup out of the changer, I know why the lens bed
cannot move back and forth - one of the plastic gear wheel is bad, it is
not broken, but it can not roate freely. where can I find a
replacement?

BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer parts
if I want to replace the pickup?

Thanks


go77306 wrote:

It appears the spindle motor works - since the music came out for about
30 seconds.

The pickup is the thing move the laser lens back and forth? if that is
the pickup, probably this is the problem - my theory is, it only plays
a
few seconds, for the first few seconds, the lens bed doesn't need to
move too much to the back (or just no need to move), as time goes on,
the lens needs to be moved a little bit back in order to keep focusing
on the track, since something wrong with the pickup (motor or track,
etc), the lens bed is still in the original place, so it lose the
focus.
what do you think?

btw, how to test if a motor is good? how much voltage should I use to
test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out
myself.

Thanks!


Mark D. Zacharias wrote:


The most common items on recent pioneers have been spindle motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without too
much
trouble, but on a problem such as this a do-it-yourself-er is really

just

shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and

spam

have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...


hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay. it
plays cd correctly for first 5-10 seconds, after that, noise comes
up,
and music get less noticeable. within about 40 seconds, both music
ang noise are gone, the player seems can not find the disc anymore!
so i decided to open it up, try to clean the laser lens, after this,
the player doesn't recognize any cds, i can see the laser head up and
down twice, then it ejects the disc. the cd just doesn't spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I need to
adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[go]

sorry, I was wrong, the upper set engaged with the rotor, and the
lower set engaged with anothe gear, so I cannot cut the chewed teeth,
I think I can use cutter/knife to 'fix' it, the wrost/last thing I can
do is to use some gule to 'melt/stick' the chewed teeth, then use
kenife to 'make' teeth.

thanks!


"Mark D. Zacharias" <mzacharias@yis.us> wrote in message news:<bpkqii$1ovq3k$1@ID-180484.news.uni-berlin.de>...

Only Pioneer parts would work. Besides, replacing the pickup would introduce
a whole new set of variables.

There's no good reason why a conventional circular plastic gear would have
this problem unless the teeth are chewed, which can be seen pretty easily.

The pickup usually has a spring-loaded rack-gear. I think I'd look closely
at that. May just have slipped a tooth or something.


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:g%fvb.130661$HoK.20926@news01.bloor.is.net.cable.rogers.com...
finally I took the pickup out of the changer, I know why the lens bed
cannot move back and forth - one of the plastic gear wheel is bad, it is
not broken, but it can not roate freely. where can I find a replacement?

BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer parts
if I want to replace the pickup?

Thanks


go77306 wrote:
It appears the spindle motor works - since the music came out for about
30 seconds.

The pickup is the thing move the laser lens back and forth? if that is
the pickup, probably this is the problem - my theory is, it only plays a
few seconds, for the first few seconds, the lens bed doesn't need to
move too much to the back (or just no need to move), as time goes on,
the lens needs to be moved a little bit back in order to keep focusing
on the track, since something wrong with the pickup (motor or track,
etc), the lens bed is still in the original place, so it lose the focus.
what do you think?

btw, how to test if a motor is good? how much voltage should I use to
test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out myself.

Thanks!


Mark D. Zacharias wrote:

The most common items on recent pioneers have been spindle motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without too
much
trouble, but on a problem such as this a do-it-yourself-er is really
just
shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and
spam
have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...

hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay. it
plays cd correctly for first 5-10 seconds, after that, noise comes up,
and music get less noticeable. within about 40 seconds, both music
ang noise are gone, the player seems can not find the disc anymore!
so i decided to open it up, try to clean the laser lens, after this,
the player doesn't recognize any cds, i can see the laser head up and
down twice, then it ejects the disc. the cd just doesn't spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I need to
adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[go77306]

Hmm... I fixed the teeth, but the loader still doesn't recognize any
cds.. what should I do?


Mark D. Zacharias wrote:

Well, I'm not picturing it exactly, but I'm familiar with Pioneer mechanisms
of the past few years.
I'll see if I can look up the gears.

mz



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:agnvb.173$IC%1.4@twister01.bloor.is.net.cable.rogers.com...

Yes, few teeth are chewed... it has two set of gears, the upper set is
big, the lower set is small, few teeth on the upper set are chewed.. I
think I can use kenife to fix the upper teeth, even remove the bad
teeth, since the lower set would work also, right?

thanks


Mark D. Zacharias wrote:


Only Pioneer parts would work. Besides, replacing the pickup would

introduce

a whole new set of variables.

There's no good reason why a conventional circular plastic gear would

have

this problem unless the teeth are chewed, which can be seen pretty

easily.

The pickup usually has a spring-loaded rack-gear. I think I'd look

closely

at that. May just have slipped a tooth or something.


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:g%fvb.130661$HoK.20926@news01.bloor.is.net.cable.rogers.com...


finally I took the pickup out of the changer, I know why the lens bed
cannot move back and forth - one of the plastic gear wheel is bad, it is
not broken, but it can not roate freely. where can I find a

replacement?

BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer parts
if I want to replace the pickup?

Thanks


go77306 wrote:


It appears the spindle motor works - since the music came out for about
30 seconds.

The pickup is the thing move the laser lens back and forth? if that is
the pickup, probably this is the problem - my theory is, it only plays

a

few seconds, for the first few seconds, the lens bed doesn't need to
move too much to the back (or just no need to move), as time goes on,
the lens needs to be moved a little bit back in order to keep focusing
on the track, since something wrong with the pickup (motor or track,
etc), the lens bed is still in the original place, so it lose the

focus.

what do you think?

btw, how to test if a motor is good? how much voltage should I use to
test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out

myself.

Thanks!


Mark D. Zacharias wrote:



The most common items on recent pioneers have been spindle motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without too
much
trouble, but on a problem such as this a do-it-yourself-er is really

just


shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and

spam


have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...



hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay. it
plays cd correctly for first 5-10 seconds, after that, noise comes

up,

and music get less noticeable. within about 40 seconds, both music
ang noise are gone, the player seems can not find the disc anymore!
so i decided to open it up, try to clean the laser lens, after this,
the player doesn't recognize any cds, i can see the laser head up and
down twice, then it ejects the disc. the cd just doesn't spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I need to
adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[go77306]

I was trying to figure out the voltage of the testpoint, but I couldn't
find the test point! I only see 2 controls on the main board, one is
VR101 and another is marked T.BAL. There is a marker 'RF' printed on
the board, it looks like the RF is point to the 17th foot of IC10 which
is M1593FP. I tested the voltage of it, it is constantly 2.36V, well,
during the arm sucks the CD in, it sometimes changed to 2.38/2.40 V, but
most of the time it is 2.36V. According the FAQ, if the focus is
locked, the RF testpoint should get about 1 volt, am I checking the
worng sopt? do you have any idea of what the VR101 is for?

According to FAQ, there should be lots of controls on the board, not
sure why mine only has two? BTW, FAQ says there is a mirror to reflect
the laser beam, but I couldn't find the mirror on my board...

any idea?

Thanks!



go77306 wrote:

Hmm... I fixed the teeth, but the loader still doesn't recognize any
cds.. what should I do?


Mark D. Zacharias wrote:

Well, I'm not picturing it exactly, but I'm familiar with Pioneer
mechanisms
of the past few years.
I'll see if I can look up the gears.

mz



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:agnvb.173$IC%1.4@twister01.bloor.is.net.cable.rogers.com...

Yes, few teeth are chewed... it has two set of gears, the upper set is
big, the lower set is small, few teeth on the upper set are chewed.. I
think I can use kenife to fix the upper teeth, even remove the bad
teeth, since the lower set would work also, right?

thanks


Mark D. Zacharias wrote:


Only Pioneer parts would work. Besides, replacing the pickup would


introduce

a whole new set of variables.

There's no good reason why a conventional circular plastic gear would


have

this problem unless the teeth are chewed, which can be seen pretty


easily.

The pickup usually has a spring-loaded rack-gear. I think I'd look


closely

at that. May just have slipped a tooth or something.


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and
spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:g%fvb.130661$HoK.20926@news01.bloor.is.net.cable.rogers.com...


finally I took the pickup out of the changer, I know why the lens bed
cannot move back and forth - one of the plastic gear wheel is bad,
it is
not broken, but it can not roate freely. where can I find a


replacement?

BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer
parts
if I want to replace the pickup?

Thanks


go77306 wrote:


It appears the spindle motor works - since the music came out for
about
30 seconds.

The pickup is the thing move the laser lens back and forth? if
that is
the pickup, probably this is the problem - my theory is, it only
plays


a

few seconds, for the first few seconds, the lens bed doesn't need to
move too much to the back (or just no need to move), as time goes on,
the lens needs to be moved a little bit back in order to keep
focusing
on the track, since something wrong with the pickup (motor or track,
etc), the lens bed is still in the original place, so it lose the


focus.

what do you think?

btw, how to test if a motor is good? how much voltage should I
use to
test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out


myself.

Thanks!


Mark D. Zacharias wrote:



The most common items on recent pioneers have been spindle motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it
without too
much
trouble, but on a problem such as this a do-it-yourself-er is really


just


shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and


spam


have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...



hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay. it
plays cd correctly for first 5-10 seconds, after that, noise comes


up,

and music get less noticeable. within about 40 seconds, both music
ang noise are gone, the player seems can not find the disc anymore!
so i decided to open it up, try to clean the laser lens, after
this,
the player doesn't recognize any cds, i can see the laser head
up and
down twice, then it ejects the disc. the cd just doesn't spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I
need to
adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[Mark D. Zacharias]

I e-mailed this info from work, but just in case you didn't get it:


1. pinion gear (very small - on sled motor) PNW2055
2. gear 1 PNW2052
3. gear 2 PNW2053
4. gear 3 PNW2054


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311210755.701af5cf@posting.google.com...

sorry, I was wrong, the upper set engaged with the rotor, and the
lower set engaged with anothe gear, so I cannot cut the chewed teeth,
I think I can use cutter/knife to 'fix' it, the wrost/last thing I can
do is to use some gule to 'melt/stick' the chewed teeth, then use
kenife to 'make' teeth.

thanks!


"Mark D. Zacharias" <mzacharias@yis.us> wrote in message
news:<bpkqii$1ovq3k$1@ID-180484.news.uni-berlin.de>...
Only Pioneer parts would work. Besides, replacing the pickup would
introduce
a whole new set of variables.

There's no good reason why a conventional circular plastic gear would
have
this problem unless the teeth are chewed, which can be seen pretty
easily.

The pickup usually has a spring-loaded rack-gear. I think I'd look
closely
at that. May just have slipped a tooth or something.


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:g%fvb.130661$HoK.20926@news01.bloor.is.net.cable.rogers.com...
finally I took the pickup out of the changer, I know why the lens bed
cannot move back and forth - one of the plastic gear wheel is bad, it
is
not broken, but it can not roate freely. where can I find a
replacement?

BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer
parts
if I want to replace the pickup?

Thanks


go77306 wrote:
It appears the spindle motor works - since the music came out for
about
30 seconds.

The pickup is the thing move the laser lens back and forth? if that
is
the pickup, probably this is the problem - my theory is, it only
plays a
few seconds, for the first few seconds, the lens bed doesn't need to
move too much to the back (or just no need to move), as time goes
on,
the lens needs to be moved a little bit back in order to keep
focusing
on the track, since something wrong with the pickup (motor or track,
etc), the lens bed is still in the original place, so it lose the
focus.
what do you think?

btw, how to test if a motor is good? how much voltage should I use
to
test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out
myself.

Thanks!


Mark D. Zacharias wrote:

The most common items on recent pioneers have been spindle motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without
too
much
trouble, but on a problem such as this a do-it-yourself-er is
really
just
shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and
spam
have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...

hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay.
it
plays cd correctly for first 5-10 seconds, after that, noise comes
up,
and music get less noticeable. within about 40 seconds, both
music
ang noise are gone, the player seems can not find the disc
anymore!
so i decided to open it up, try to clean the laser lens, after
this,
the player doesn't recognize any cds, i can see the laser head up
and
down twice, then it ejects the disc. the cd just doesn't spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I need
to
adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[go77306]

Thanks! I received it in Email. I fix the teeth, the gear now can
rotate freely. But it still doesn't recongnize... do you know where is
the RF testpoint of that board? (MKM-X81)? I only see 2 controls on the
board, one is labled VR101 and another is T.BAL (Tracking Balance?, does
it has anything to do with foucusing?) Just FYI, the main IC is M1593FP.

Thanks


Mark D. Zacharias wrote:

I e-mailed this info from work, but just in case you didn't get it:


1. pinion gear (very small - on sled motor) PNW2055
2. gear 1 PNW2052
3. gear 2 PNW2053
4. gear 3 PNW2054


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311210755.701af5cf@posting.google.com...

sorry, I was wrong, the upper set engaged with the rotor, and the
lower set engaged with anothe gear, so I cannot cut the chewed teeth,
I think I can use cutter/knife to 'fix' it, the wrost/last thing I can
do is to use some gule to 'melt/stick' the chewed teeth, then use
kenife to 'make' teeth.

thanks!


"Mark D. Zacharias" <mzacharias@yis.us> wrote in message

news:<bpkqii$1ovq3k$1@ID-180484.news.uni-berlin.de>...

Only Pioneer parts would work. Besides, replacing the pickup would

introduce

a whole new set of variables.

There's no good reason why a conventional circular plastic gear would

have

this problem unless the teeth are chewed, which can be seen pretty

easily.

The pickup usually has a spring-loaded rack-gear. I think I'd look

closely

at that. May just have slipped a tooth or something.


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:g%fvb.130661$HoK.20926@news01.bloor.is.net.cable.rogers.com...

finally I took the pickup out of the changer, I know why the lens bed
cannot move back and forth - one of the plastic gear wheel is bad, it

is

not broken, but it can not roate freely. where can I find a

replacement?

BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer

parts

if I want to replace the pickup?

Thanks


go77306 wrote:

It appears the spindle motor works - since the music came out for

about

30 seconds.

The pickup is the thing move the laser lens back and forth? if that

is

the pickup, probably this is the problem - my theory is, it only

plays a

few seconds, for the first few seconds, the lens bed doesn't need to
move too much to the back (or just no need to move), as time goes

on,

the lens needs to be moved a little bit back in order to keep

focusing

on the track, since something wrong with the pickup (motor or track,
etc), the lens bed is still in the original place, so it lose the

focus.

what do you think?

btw, how to test if a motor is good? how much voltage should I use

to

test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out

myself.

Thanks!


Mark D. Zacharias wrote:


The most common items on recent pioneers have been spindle motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without

too

much
trouble, but on a problem such as this a do-it-yourself-er is

really

just

shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and

spam

have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...


hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay.

it

plays cd correctly for first 5-10 seconds, after that, noise comes

up,

and music get less noticeable. within about 40 seconds, both

music

ang noise are gone, the player seems can not find the disc

anymore!

so i decided to open it up, try to clean the laser lens, after

this,

the player doesn't recognize any cds, i can see the laser head up

and

down twice, then it ejects the disc. the cd just doesn't spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I need

to

adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[Mark D. Zacharias]

Don't mess with any of the adjustments. It won't fix anything, and might
complicate things later.

It's difficult trying to troubleshoot by proxy like this. You may have
introduced an unrelated problem in your earlier efforts, for example.

A circuit problem is unlikely, unless you shorted out something, in which
case you might have a small fuse or IC protector bad.

Which gets us back to basic CD troubleshooting. You need to determine if the
laser focus search is being done, and that the laser "lights up" when it's
supposed to. This "light" is invisible to the naked eye, but if you are able
to look deep inside the lens during focus-search, from an angle, and not too
close, you should see a small red dot when the laser is turned ON.
Or you can use a camcorder to view the laser - the lens will appear as a
white spot in the viewfinder when tirned ON.

I'm leaning towards a bad pickup at this point, but as I say, there's the
potential for other variables from your earlier efforts, which I can't
account for.

Let us know what you find.


Mark Z.
--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:l%Hvb.298$B04.153@twister01.bloor.is.net.cable.rogers.com...

Thanks! I received it in Email. I fix the teeth, the gear now can
rotate freely. But it still doesn't recongnize... do you know where is
the RF testpoint of that board? (MKM-X81)? I only see 2 controls on the
board, one is labled VR101 and another is T.BAL (Tracking Balance?, does
it has anything to do with foucusing?) Just FYI, the main IC is M1593FP.

Thanks


Mark D. Zacharias wrote:

I e-mailed this info from work, but just in case you didn't get it:


1. pinion gear (very small - on sled motor) PNW2055
2. gear 1 PNW2052
3. gear 2 PNW2053
4. gear 3 PNW2054


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311210755.701af5cf@posting.google.com...

sorry, I was wrong, the upper set engaged with the rotor, and the
lower set engaged with anothe gear, so I cannot cut the chewed teeth,
I think I can use cutter/knife to 'fix' it, the wrost/last thing I can
do is to use some gule to 'melt/stick' the chewed teeth, then use
kenife to 'make' teeth.

thanks!


"Mark D. Zacharias" <mzacharias@yis.us> wrote in message

news:<bpkqii$1ovq3k$1@ID-180484.news.uni-berlin.de>...

Only Pioneer parts would work. Besides, replacing the pickup would

introduce

a whole new set of variables.

There's no good reason why a conventional circular plastic gear would

have

this problem unless the teeth are chewed, which can be seen pretty

easily.

The pickup usually has a spring-loaded rack-gear. I think I'd look

closely

at that. May just have slipped a tooth or something.


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and
spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:g%fvb.130661$HoK.20926@news01.bloor.is.net.cable.rogers.com...

finally I took the pickup out of the changer, I know why the lens bed
cannot move back and forth - one of the plastic gear wheel is bad, it

is

not broken, but it can not roate freely. where can I find a

replacement?

BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer

parts

if I want to replace the pickup?

Thanks


go77306 wrote:

It appears the spindle motor works - since the music came out for

about

30 seconds.

The pickup is the thing move the laser lens back and forth? if that

is

the pickup, probably this is the problem - my theory is, it only

plays a

few seconds, for the first few seconds, the lens bed doesn't need to
move too much to the back (or just no need to move), as time goes

on,

the lens needs to be moved a little bit back in order to keep

focusing

on the track, since something wrong with the pickup (motor or track,
etc), the lens bed is still in the original place, so it lose the

focus.

what do you think?

btw, how to test if a motor is good? how much voltage should I use

to

test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out

myself.

Thanks!


Mark D. Zacharias wrote:


The most common items on recent pioneers have been spindle motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without

too

much
trouble, but on a problem such as this a do-it-yourself-er is

really

just

shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and

spam

have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...


hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay.

it

plays cd correctly for first 5-10 seconds, after that, noise comes

up,

and music get less noticeable. within about 40 seconds, both

music

ang noise are gone, the player seems can not find the disc

anymore!

so i decided to open it up, try to clean the laser lens, after

this,

the player doesn't recognize any cds, i can see the laser head up

and

down twice, then it ejects the disc. the cd just doesn't spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I need

to

adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[go77306]

Thanks, Mark!

I bought another as-is Pioneer: CCS-406 off ebay... no suprise, the
internal construction is exactly the same as XR-A700. The CD-Player has
exactly same problem! first 10 seconds is ok, after that, noise comes.

I took the pickup unit off, Yeah, the teeth are ok, but the pinion gear
is not sitting in the correctly position: it almost off the sled motor:

The correct position should be:

<-----> <- pinion gear
< | ><--------------------> <- gear 2
<--|--><-------------------->
|===========|
| |
| |
| | <- Sled motor
| |
| |
|===========|



The pinion gear on CCS-406 almost off the motor:

<----->
< > <- pinion gear
<--|--><--------------------> <- gear 2
| <-------------------->
|
|===========|
| |
| |
| | <- Sled motor
| |
| |
|===========|



Now I rememebr that the XR-A700's pinion gear was also off too, this
explains why the teeth were chewed!

OK, I just push the pinion gear back into the correct position, and put
it back to the machine, it worked!!! My theory works..

Unfortunately, it seems I introducted some other unrelated problems to
XR-A00 in my earlier effforts... Since the pikup is exactly same, I
double checked the actions of focus, the working pickup (CCS-406) never
move the lens up and down, and once I put the cd in, the cd just spins.
I put 1.5v DC to the spindle motor, it spins.. so the motor is good.
what could be the problem? why the cd doesn't spin?

You said there could be a fuse or IC protector is bad.... where is that?

Sorry, this reply is very long, but I really appericate your help!


Thanks!





Mark D. Zacharias wrote:

Don't mess with any of the adjustments. It won't fix anything, and might
complicate things later.

It's difficult trying to troubleshoot by proxy like this. You may have
introduced an unrelated problem in your earlier efforts, for example.

A circuit problem is unlikely, unless you shorted out something, in which
case you might have a small fuse or IC protector bad.

Which gets us back to basic CD troubleshooting. You need to determine if the
laser focus search is being done, and that the laser "lights up" when it's
supposed to. This "light" is invisible to the naked eye, but if you are able
to look deep inside the lens during focus-search, from an angle, and not too
close, you should see a small red dot when the laser is turned ON.
Or you can use a camcorder to view the laser - the lens will appear as a
white spot in the viewfinder when tirned ON.

I'm leaning towards a bad pickup at this point, but as I say, there's the
potential for other variables from your earlier efforts, which I can't
account for.

Let us know what you find.


Mark Z.
--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:l%Hvb.298$B04.153@twister01.bloor.is.net.cable.rogers.com...

Thanks! I received it in Email. I fix the teeth, the gear now can
rotate freely. But it still doesn't recongnize... do you know where is
the RF testpoint of that board? (MKM-X81)? I only see 2 controls on the
board, one is labled VR101 and another is T.BAL (Tracking Balance?, does
it has anything to do with foucusing?) Just FYI, the main IC is M1593FP.

Thanks


Mark D. Zacharias wrote:


I e-mailed this info from work, but just in case you didn't get it:


1. pinion gear (very small - on sled motor) PNW2055
2. gear 1 PNW2052
3. gear 2 PNW2053
4. gear 3 PNW2054


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311210755.701af5cf@posting.google.com...


sorry, I was wrong, the upper set engaged with the rotor, and the
lower set engaged with anothe gear, so I cannot cut the chewed teeth,
I think I can use cutter/knife to 'fix' it, the wrost/last thing I can
do is to use some gule to 'melt/stick' the chewed teeth, then use
kenife to 'make' teeth.

thanks!


"Mark D. Zacharias" <mzacharias@yis.us> wrote in message

news:<bpkqii$1ovq3k$1@ID-180484.news.uni-berlin.de>...


Only Pioneer parts would work. Besides, replacing the pickup would

introduce


a whole new set of variables.

There's no good reason why a conventional circular plastic gear would

have


this problem unless the teeth are chewed, which can be seen pretty

easily.


The pickup usually has a spring-loaded rack-gear. I think I'd look

closely


at that. May just have slipped a tooth or something.


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and

spam

have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:g%fvb.130661$HoK.20926@news01.bloor.is.net.cable.rogers.com...


finally I took the pickup out of the changer, I know why the lens bed
cannot move back and forth - one of the plastic gear wheel is bad, it

is


not broken, but it can not roate freely. where can I find a

replacement?


BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer

parts


if I want to replace the pickup?

Thanks


go77306 wrote:


It appears the spindle motor works - since the music came out for

about


30 seconds.

The pickup is the thing move the laser lens back and forth? if that

is


the pickup, probably this is the problem - my theory is, it only

plays a


few seconds, for the first few seconds, the lens bed doesn't need to
move too much to the back (or just no need to move), as time goes

on,


the lens needs to be moved a little bit back in order to keep

focusing


on the track, since something wrong with the pickup (motor or track,
etc), the lens bed is still in the original place, so it lose the

focus.


what do you think?

btw, how to test if a motor is good? how much voltage should I use

to


test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out

myself.


Thanks!


Mark D. Zacharias wrote:



The most common items on recent pioneers have been spindle motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without

too


much
trouble, but on a problem such as this a do-it-yourself-er is

really


just


shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and

spam


have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...



hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay.

it


plays cd correctly for first 5-10 seconds, after that, noise comes

up,


and music get less noticeable. within about 40 seconds, both

music


ang noise are gone, the player seems can not find the disc

anymore!


so i decided to open it up, try to clean the laser lens, after

this,


the player doesn't recognize any cds, i can see the laser head up

and


down twice, then it ejects the disc. the cd just doesn't spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I need

to


adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[go77306]

BTW, I will check if I can see the red dot/white dot after I clean up
the mess... thanks!

go77306 wrote:

Thanks, Mark!

I bought another as-is Pioneer: CCS-406 off ebay... no suprise, the
internal construction is exactly the same as XR-A700. The CD-Player has
exactly same problem! first 10 seconds is ok, after that, noise comes.

I took the pickup unit off, Yeah, the teeth are ok, but the pinion gear
is not sitting in the correctly position: it almost off the sled motor:

The correct position should be:

-----> <- pinion gear
| ><--------------------> <- gear 2
--|--><--------------------
|===========|
| |
| |
| | <- Sled motor
| |
| |
|===========|



The pinion gear on CCS-406 almost off the motor:

-----
- pinion gear
--|--><--------------------> <- gear 2
| <--------------------
|
|===========|
| |
| |
| | <- Sled motor
| |
| |
|===========|



Now I rememebr that the XR-A700's pinion gear was also off too, this
explains why the teeth were chewed!

OK, I just push the pinion gear back into the correct position, and put
it back to the machine, it worked!!! My theory works..

Unfortunately, it seems I introducted some other unrelated problems to
XR-A00 in my earlier effforts... Since the pikup is exactly same, I
double checked the actions of focus, the working pickup (CCS-406) never
move the lens up and down, and once I put the cd in, the cd just spins.
I put 1.5v DC to the spindle motor, it spins.. so the motor is good.
what could be the problem? why the cd doesn't spin?

You said there could be a fuse or IC protector is bad.... where is that?

Sorry, this reply is very long, but I really appericate your help!


Thanks!





Mark D. Zacharias wrote:

Don't mess with any of the adjustments. It won't fix anything, and might
complicate things later.

It's difficult trying to troubleshoot by proxy like this. You may have
introduced an unrelated problem in your earlier efforts, for example.

A circuit problem is unlikely, unless you shorted out something, in which
case you might have a small fuse or IC protector bad.

Which gets us back to basic CD troubleshooting. You need to determine
if the
laser focus search is being done, and that the laser "lights up" when
it's
supposed to. This "light" is invisible to the naked eye, but if you
are able
to look deep inside the lens during focus-search, from an angle, and
not too
close, you should see a small red dot when the laser is turned ON.
Or you can use a camcorder to view the laser - the lens will appear as a
white spot in the viewfinder when tirned ON.

I'm leaning towards a bad pickup at this point, but as I say, there's the
potential for other variables from your earlier efforts, which I can't
account for.

Let us know what you find.


Mark Z.
--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:l%Hvb.298$B04.153@twister01.bloor.is.net.cable.rogers.com...

Thanks! I received it in Email. I fix the teeth, the gear now can
rotate freely. But it still doesn't recongnize... do you know where is
the RF testpoint of that board? (MKM-X81)? I only see 2 controls on the
board, one is labled VR101 and another is T.BAL (Tracking Balance?, does
it has anything to do with foucusing?) Just FYI, the main IC is
M1593FP.

Thanks


Mark D. Zacharias wrote:


I e-mailed this info from work, but just in case you didn't get it:


1. pinion gear (very small - on sled motor) PNW2055
2. gear 1 PNW2052
3. gear 2 PNW2053
4. gear 3 PNW2054


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and
spam
have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311210755.701af5cf@posting.google.com...


sorry, I was wrong, the upper set engaged with the rotor, and the
lower set engaged with anothe gear, so I cannot cut the chewed teeth,
I think I can use cutter/knife to 'fix' it, the wrost/last thing I can
do is to use some gule to 'melt/stick' the chewed teeth, then use
kenife to 'make' teeth.

thanks!


"Mark D. Zacharias" <mzacharias@yis.us> wrote in message


news:<bpkqii$1ovq3k$1@ID-180484.news.uni-berlin.de>...


Only Pioneer parts would work. Besides, replacing the pickup would


introduce


a whole new set of variables.

There's no good reason why a conventional circular plastic gear would


have


this problem unless the teeth are chewed, which can be seen pretty


easily.


The pickup usually has a spring-loaded rack-gear. I think I'd look


closely


at that. May just have slipped a tooth or something.


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and


spam

have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:g%fvb.130661$HoK.20926@news01.bloor.is.net.cable.rogers.com...


finally I took the pickup out of the changer, I know why the lens
bed
cannot move back and forth - one of the plastic gear wheel is
bad, it


is


not broken, but it can not roate freely. where can I find a


replacement?


BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer


parts


if I want to replace the pickup?

Thanks


go77306 wrote:


It appears the spindle motor works - since the music came out for


about


30 seconds.

The pickup is the thing move the laser lens back and forth? if
that


is


the pickup, probably this is the problem - my theory is, it only


plays a


few seconds, for the first few seconds, the lens bed doesn't
need to
move too much to the back (or just no need to move), as time goes


on,


the lens needs to be moved a little bit back in order to keep


focusing


on the track, since something wrong with the pickup (motor or
track,
etc), the lens bed is still in the original place, so it lose the


focus.


what do you think?

btw, how to test if a motor is good? how much voltage should I use


to


test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out


myself.


Thanks!


Mark D. Zacharias wrote:



The most common items on recent pioneers have been spindle motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without


too


much
trouble, but on a problem such as this a do-it-yourself-er is


really


just


shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses
and


spam


have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...



hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay.


it


plays cd correctly for first 5-10 seconds, after that, noise
comes


up,


and music get less noticeable. within about 40 seconds, both


music


ang noise are gone, the player seems can not find the disc


anymore!


so i decided to open it up, try to clean the laser lens, after


this,


the player doesn't recognize any cds, i can see the laser head up


and


down twice, then it ejects the disc. the cd just doesn't
spin. I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I
need


to


adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[Mark D. Zacharias]

Probably in or near the main part of the power supply.

Mark Z.

You said there could be a fuse or IC protector is bad.... >where is that?

--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:y8Qvb.156304$HoK.73317@news01.bloor.is.net.cable.rogers.com...

Thanks, Mark!

I bought another as-is Pioneer: CCS-406 off ebay... no suprise, the
internal construction is exactly the same as XR-A700. The CD-Player has
exactly same problem! first 10 seconds is ok, after that, noise comes.

I took the pickup unit off, Yeah, the teeth are ok, but the pinion gear
is not sitting in the correctly position: it almost off the sled motor:

The correct position should be:

-----> <- pinion gear
| ><--------------------> <- gear 2
--|--><--------------------
|===========|
| |
| |
| | <- Sled motor
| |
| |
|===========|



The pinion gear on CCS-406 almost off the motor:

-----
- pinion gear
--|--><--------------------> <- gear 2
| <--------------------
|
|===========|
| |
| |
| | <- Sled motor
| |
| |
|===========|



Now I rememebr that the XR-A700's pinion gear was also off too, this
explains why the teeth were chewed!

OK, I just push the pinion gear back into the correct position, and put
it back to the machine, it worked!!! My theory works..

Unfortunately, it seems I introducted some other unrelated problems to
XR-A00 in my earlier effforts... Since the pikup is exactly same, I
double checked the actions of focus, the working pickup (CCS-406) never
move the lens up and down, and once I put the cd in, the cd just spins.
I put 1.5v DC to the spindle motor, it spins.. so the motor is good.
what could be the problem? why the cd doesn't spin?

You said there could be a fuse or IC protector is bad.... where is that?

Sorry, this reply is very long, but I really appericate your help!


Thanks!





Mark D. Zacharias wrote:

Don't mess with any of the adjustments. It won't fix anything, and might
complicate things later.

It's difficult trying to troubleshoot by proxy like this. You may have
introduced an unrelated problem in your earlier efforts, for example.

A circuit problem is unlikely, unless you shorted out something, in
which
case you might have a small fuse or IC protector bad.

Which gets us back to basic CD troubleshooting. You need to determine if
the
laser focus search is being done, and that the laser "lights up" when
it's
supposed to. This "light" is invisible to the naked eye, but if you are
able
to look deep inside the lens during focus-search, from an angle, and not
too
close, you should see a small red dot when the laser is turned ON.
Or you can use a camcorder to view the laser - the lens will appear as a
white spot in the viewfinder when tirned ON.

I'm leaning towards a bad pickup at this point, but as I say, there's
the
potential for other variables from your earlier efforts, which I can't
account for.

Let us know what you find.


Mark Z.
--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:l%Hvb.298$B04.153@twister01.bloor.is.net.cable.rogers.com...

Thanks! I received it in Email. I fix the teeth, the gear now can
rotate freely. But it still doesn't recongnize... do you know where is
the RF testpoint of that board? (MKM-X81)? I only see 2 controls on the
board, one is labled VR101 and another is T.BAL (Tracking Balance?, does
it has anything to do with foucusing?) Just FYI, the main IC is
M1593FP.

Thanks


Mark D. Zacharias wrote:


I e-mailed this info from work, but just in case you didn't get it:


1. pinion gear (very small - on sled motor) PNW2055
2. gear 1 PNW2052
3. gear 2 PNW2053
4. gear 3 PNW2054


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and
spam
have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311210755.701af5cf@posting.google.com...


sorry, I was wrong, the upper set engaged with the rotor, and the
lower set engaged with anothe gear, so I cannot cut the chewed teeth,
I think I can use cutter/knife to 'fix' it, the wrost/last thing I can
do is to use some gule to 'melt/stick' the chewed teeth, then use
kenife to 'make' teeth.

thanks!


"Mark D. Zacharias" <mzacharias@yis.us> wrote in message

news:<bpkqii$1ovq3k$1@ID-180484.news.uni-berlin.de>...


Only Pioneer parts would work. Besides, replacing the pickup would

introduce


a whole new set of variables.

There's no good reason why a conventional circular plastic gear would

have


this problem unless the teeth are chewed, which can be seen pretty

easily.


The pickup usually has a spring-loaded rack-gear. I think I'd look

closely


at that. May just have slipped a tooth or something.


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and

spam

have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:g%fvb.130661$HoK.20926@news01.bloor.is.net.cable.rogers.com...


finally I took the pickup out of the changer, I know why the lens
bed
cannot move back and forth - one of the plastic gear wheel is bad,
it

is


not broken, but it can not roate freely. where can I find a

replacement?


BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer

parts


if I want to replace the pickup?

Thanks


go77306 wrote:


It appears the spindle motor works - since the music came out for

about


30 seconds.

The pickup is the thing move the laser lens back and forth? if
that

is


the pickup, probably this is the problem - my theory is, it only

plays a


few seconds, for the first few seconds, the lens bed doesn't need
to
move too much to the back (or just no need to move), as time goes

on,


the lens needs to be moved a little bit back in order to keep

focusing


on the track, since something wrong with the pickup (motor or
track,
etc), the lens bed is still in the original place, so it lose the

focus.


what do you think?

btw, how to test if a motor is good? how much voltage should I use

to


test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out

myself.


Thanks!


Mark D. Zacharias wrote:



The most common items on recent pioneers have been spindle motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without

too


much
trouble, but on a problem such as this a do-it-yourself-er is

really


just


shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses
and

spam


have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...



hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay.

it


plays cd correctly for first 5-10 seconds, after that, noise
comes

up,


and music get less noticeable. within about 40 seconds, both

music


ang noise are gone, the player seems can not find the disc

anymore!


so i decided to open it up, try to clean the laser lens, after

this,


the player doesn't recognize any cds, i can see the laser head up

and


down twice, then it ejects the disc. the cd just doesn't spin.
I
then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I
need

to


adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[go77306]

hmmm, I think the power supply is ok. I pluged in the good pickup unit
from CCS-406 to XR-A700, it workedso, I think the problem is somehwere
on the pockup unit..


Mark D. Zacharias wrote:

Probably in or near the main part of the power supply.

Mark Z.



You said there could be a fuse or IC protector is bad.... >where is that?


--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:y8Qvb.156304$HoK.73317@news01.bloor.is.net.cable.rogers.com...

Thanks, Mark!

I bought another as-is Pioneer: CCS-406 off ebay... no suprise, the
internal construction is exactly the same as XR-A700. The CD-Player has
exactly same problem! first 10 seconds is ok, after that, noise comes.

I took the pickup unit off, Yeah, the teeth are ok, but the pinion gear
is not sitting in the correctly position: it almost off the sled motor:

The correct position should be:

-----> <- pinion gear
| ><--------------------> <- gear 2
--|--><--------------------
|===========|
| |
| |
| | <- Sled motor
| |
| |
|===========|



The pinion gear on CCS-406 almost off the motor:

-----
- pinion gear
--|--><--------------------> <- gear 2
| <--------------------
|
|===========|
| |
| |
| | <- Sled motor
| |
| |
|===========|



Now I rememebr that the XR-A700's pinion gear was also off too, this
explains why the teeth were chewed!

OK, I just push the pinion gear back into the correct position, and put
it back to the machine, it worked!!! My theory works..

Unfortunately, it seems I introducted some other unrelated problems to
XR-A00 in my earlier effforts... Since the pikup is exactly same, I
double checked the actions of focus, the working pickup (CCS-406) never
move the lens up and down, and once I put the cd in, the cd just spins.
I put 1.5v DC to the spindle motor, it spins.. so the motor is good.
what could be the problem? why the cd doesn't spin?

You said there could be a fuse or IC protector is bad.... where is that?

Sorry, this reply is very long, but I really appericate your help!


Thanks!





Mark D. Zacharias wrote:


Don't mess with any of the adjustments. It won't fix anything, and might
complicate things later.

It's difficult trying to troubleshoot by proxy like this. You may have
introduced an unrelated problem in your earlier efforts, for example.

A circuit problem is unlikely, unless you shorted out something, in

which

case you might have a small fuse or IC protector bad.

Which gets us back to basic CD troubleshooting. You need to determine if

the

laser focus search is being done, and that the laser "lights up" when

it's

supposed to. This "light" is invisible to the naked eye, but if you are

able

to look deep inside the lens during focus-search, from an angle, and not

too

close, you should see a small red dot when the laser is turned ON.
Or you can use a camcorder to view the laser - the lens will appear as a
white spot in the viewfinder when tirned ON.

I'm leaning towards a bad pickup at this point, but as I say, there's

the

potential for other variables from your earlier efforts, which I can't
account for.

Let us know what you find.


Mark Z.
--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:l%Hvb.298$B04.153@twister01.bloor.is.net.cable.rogers.com...


Thanks! I received it in Email. I fix the teeth, the gear now can
rotate freely. But it still doesn't recongnize... do you know where is
the RF testpoint of that board? (MKM-X81)? I only see 2 controls on the
board, one is labled VR101 and another is T.BAL (Tracking Balance?, does
it has anything to do with foucusing?) Just FYI, the main IC is

M1593FP.

Thanks


Mark D. Zacharias wrote:



I e-mailed this info from work, but just in case you didn't get it:


1. pinion gear (very small - on sled motor) PNW2055
2. gear 1 PNW2052
3. gear 2 PNW2053
4. gear 3 PNW2054


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and

spam

have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311210755.701af5cf@posting.google.com...



sorry, I was wrong, the upper set engaged with the rotor, and the
lower set engaged with anothe gear, so I cannot cut the chewed teeth,
I think I can use cutter/knife to 'fix' it, the wrost/last thing I can
do is to use some gule to 'melt/stick' the chewed teeth, then use
kenife to 'make' teeth.

thanks!


"Mark D. Zacharias" <mzacharias@yis.us> wrote in message

news:<bpkqii$1ovq3k$1@ID-180484.news.uni-berlin.de>...



Only Pioneer parts would work. Besides, replacing the pickup would

introduce



a whole new set of variables.

There's no good reason why a conventional circular plastic gear would

have



this problem unless the teeth are chewed, which can be seen pretty

easily.



The pickup usually has a spring-loaded rack-gear. I think I'd look

closely



at that. May just have slipped a tooth or something.


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and

spam


have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:g%fvb.130661$HoK.20926@news01.bloor.is.net.cable.rogers.com...



finally I took the pickup out of the changer, I know why the lens

bed

cannot move back and forth - one of the plastic gear wheel is bad,

it

is



not broken, but it can not roate freely. where can I find a

replacement?



BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer

parts



if I want to replace the pickup?

Thanks


go77306 wrote:



It appears the spindle motor works - since the music came out for

about



30 seconds.

The pickup is the thing move the laser lens back and forth? if

that

is



the pickup, probably this is the problem - my theory is, it only

plays a



few seconds, for the first few seconds, the lens bed doesn't need

to

move too much to the back (or just no need to move), as time goes

on,



the lens needs to be moved a little bit back in order to keep

focusing



on the track, since something wrong with the pickup (motor or

track,

etc), the lens bed is still in the original place, so it lose the

focus.



what do you think?

btw, how to test if a motor is good? how much voltage should I use

to



test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out

myself.



Thanks!


Mark D. Zacharias wrote:




The most common items on recent pioneers have been spindle motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it without

too



much
trouble, but on a problem such as this a do-it-yourself-er is

really



just



shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses

and

spam



have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...




hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay.

it



plays cd correctly for first 5-10 seconds, after that, noise

comes

up,



and music get less noticeable. within about 40 seconds, both

music



ang noise are gone, the player seems can not find the disc

anymore!



so i decided to open it up, try to clean the laser lens, after

this,



the player doesn't recognize any cds, i can see the laser head up

and



down twice, then it ejects the disc. the cd just doesn't spin.

I

then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I

need

to



adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!

 

[Mark D. Zacharias]

OK, so if you plugged in the other pickup (I assume it was the entire
traverse assembly with motors etc) and it worked, then you've eliminated a
circuit problem, and now it's down to a pickup problem or some other problem
with that traverse unit - a bad limit switch or shorted spindle motor for
example.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:Hvdwb.8917$X2W1.5022@news04.bloor.is.net.cable.rogers.com...

hmmm, I think the power supply is ok. I pluged in the good pickup unit
from CCS-406 to XR-A700, it workedso, I think the problem is somehwere
on the pockup unit..


Mark D. Zacharias wrote:
Probably in or near the main part of the power supply.

Mark Z.



You said there could be a fuse or IC protector is bad.... >where is
that?


--
Please reply only to Group. I regret this is necessary. Viruses and spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:y8Qvb.156304$HoK.73317@news01.bloor.is.net.cable.rogers.com...

Thanks, Mark!

I bought another as-is Pioneer: CCS-406 off ebay... no suprise, the
internal construction is exactly the same as XR-A700. The CD-Player has
exactly same problem! first 10 seconds is ok, after that, noise
comes.

I took the pickup unit off, Yeah, the teeth are ok, but the pinion gear
is not sitting in the correctly position: it almost off the sled motor:

The correct position should be:

-----> <- pinion gear
| ><--------------------> <- gear 2
--|--><--------------------
|===========|
| |
| |
| | <- Sled motor
| |
| |
|===========|



The pinion gear on CCS-406 almost off the motor:

-----
- pinion gear
--|--><--------------------> <- gear 2
| <--------------------
|
|===========|
| |
| |
| | <- Sled motor
| |
| |
|===========|



Now I rememebr that the XR-A700's pinion gear was also off too, this
explains why the teeth were chewed!

OK, I just push the pinion gear back into the correct position, and put
it back to the machine, it worked!!! My theory works..

Unfortunately, it seems I introducted some other unrelated problems to
XR-A00 in my earlier effforts... Since the pikup is exactly same, I
double checked the actions of focus, the working pickup (CCS-406) never
move the lens up and down, and once I put the cd in, the cd just spins.
I put 1.5v DC to the spindle motor, it spins.. so the motor is good.
what could be the problem? why the cd doesn't spin?

You said there could be a fuse or IC protector is bad.... where is that?

Sorry, this reply is very long, but I really appericate your help!


Thanks!





Mark D. Zacharias wrote:


Don't mess with any of the adjustments. It won't fix anything, and
might
complicate things later.

It's difficult trying to troubleshoot by proxy like this. You may have
introduced an unrelated problem in your earlier efforts, for example.

A circuit problem is unlikely, unless you shorted out something, in

which

case you might have a small fuse or IC protector bad.

Which gets us back to basic CD troubleshooting. You need to determine
if

the

laser focus search is being done, and that the laser "lights up" when

it's

supposed to. This "light" is invisible to the naked eye, but if you are

able

to look deep inside the lens during focus-search, from an angle, and
not

too

close, you should see a small red dot when the laser is turned ON.
Or you can use a camcorder to view the laser - the lens will appear as
a
white spot in the viewfinder when tirned ON.

I'm leaning towards a bad pickup at this point, but as I say, there's

the

potential for other variables from your earlier efforts, which I can't
account for.

Let us know what you find.


Mark Z.
--
Please reply only to Group. I regret this is necessary. Viruses and
spam
have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:l%Hvb.298$B04.153@twister01.bloor.is.net.cable.rogers.com...


Thanks! I received it in Email. I fix the teeth, the gear now can
rotate freely. But it still doesn't recongnize... do you know where
is
the RF testpoint of that board? (MKM-X81)? I only see 2 controls on
the
board, one is labled VR101 and another is T.BAL (Tracking Balance?,
does
it has anything to do with foucusing?) Just FYI, the main IC is

M1593FP.

Thanks


Mark D. Zacharias wrote:



I e-mailed this info from work, but just in case you didn't get it:


1. pinion gear (very small - on sled motor) PNW2055
2. gear 1 PNW2052
3. gear 2 PNW2053
4. gear 3 PNW2054


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and

spam

have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311210755.701af5cf@posting.google.com...



sorry, I was wrong, the upper set engaged with the rotor, and the
lower set engaged with anothe gear, so I cannot cut the chewed
teeth,
I think I can use cutter/knife to 'fix' it, the wrost/last thing I
can
do is to use some gule to 'melt/stick' the chewed teeth, then use
kenife to 'make' teeth.

thanks!


"Mark D. Zacharias" <mzacharias@yis.us> wrote in message

news:<bpkqii$1ovq3k$1@ID-180484.news.uni-berlin.de>...



Only Pioneer parts would work. Besides, replacing the pickup would

introduce



a whole new set of variables.

There's no good reason why a conventional circular plastic gear
would

have



this problem unless the teeth are chewed, which can be seen pretty

easily.



The pickup usually has a spring-loaded rack-gear. I think I'd look

closely



at that. May just have slipped a tooth or something.


Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses and

spam


have rendered my regular e-mail address useless.


"go77306" <go77306@yahoo.com> wrote in message
news:g%fvb.130661$HoK.20926@news01.bloor.is.net.cable.rogers.com...



finally I took the pickup out of the changer, I know why the lens

bed

cannot move back and forth - one of the plastic gear wheel is bad,

it

is



not broken, but it can not roate freely. where can I find a

replacement?



BTW, I saw a complete lens pickup at local electronic store ($45
canadian dollars), is it generic parts? or I have to use pioneer

parts



if I want to replace the pickup?

Thanks


go77306 wrote:



It appears the spindle motor works - since the music came out for

about



30 seconds.

The pickup is the thing move the laser lens back and forth? if

that

is



the pickup, probably this is the problem - my theory is, it only

plays a



few seconds, for the first few seconds, the lens bed doesn't need

to

move too much to the back (or just no need to move), as time goes

on,



the lens needs to be moved a little bit back in order to keep

focusing



on the track, since something wrong with the pickup (motor or

track,

etc), the lens bed is still in the original place, so it lose the

focus.



what do you think?

btw, how to test if a motor is good? how much voltage should I
use

to



test if it is working? 3 volts? or even less?

since this is a $20 purchase, i don't mind to try everything out

myself.



Thanks!


Mark D. Zacharias wrote:




The most common items on recent pioneers have been spindle
motors,
pickups,
and flex cables.
Not familiar with your particular model.
Seems to me a tech could do the troubleshooting and fix it
without

too



much
trouble, but on a problem such as this a do-it-yourself-er is

really



just



shooting in the dark most of the time.

Mark Z.



--
Please reply only to Group. I regret this is necessary. Viruses

and

spam



have rendered my regular e-mail address useless.


"go" <go77306@yahoo.com> wrote in message
news:39340804.0311191941.7223f9ad@posting.google.com...




hi:

i bought an as-is pioneer xr-a700 25 disc cd changer from ebay.

it



plays cd correctly for first 5-10 seconds, after that, noise

comes

up,



and music get less noticeable. within about 40 seconds, both

music



ang noise are gone, the player seems can not find the disc

anymore!



so i decided to open it up, try to clean the laser lens, after

this,



the player doesn't recognize any cds, i can see the laser head
up

and



down twice, then it ejects the disc. the cd just doesn't spin.

I

then use the compressed air to clean the lens again, with zero
success. What could be the problem? is the dirty lens? or I

need

to



adjust the bed? Can someone help me out?

The other functions work great - radio/aux/tape are just fine.

Thanks!