problems with my Adcom CD player

Shaun · Feb 20, 2011

Hello,

I have a used ADCOM GCD-700 5 disk CD player that was given to me and it is
overly sensitive to vibrations, bumps and slight scratches on the CDs. I've
mounted it on vibration absorbing rubber and this has greatly impoved its
bump and vibration sensitivity, but it is still very sensitive to the
slightest mark or scratch on cds. How can I cure this.

thanks in advance,

Shaun

Tim Schwartz · Feb 20, 2011

On 2/20/2011 3:13 PM, Shaun wrote:

Hello,

I have a used ADCOM GCD-700 5 disk CD player that was given to me and it is
overly sensitive to vibrations, bumps and slight scratches on the CDs. I've
mounted it on vibration absorbing rubber and this has greatly impoved its
bump and vibration sensitivity, but it is still very sensitive to the
slightest mark or scratch on cds. How can I cure this.

thanks in advance,

Shaun

Shaun,

If this machine is as old as I think it is, then its not worth putting
any serious money into it. There is likely a manufacturing date on the
machine that will give the month and year it was made. Make sure if
there are any transit screws on the bottom they are removed or in the
released position.

You could try cleaning the lens and the disc platter. You'd have to
open the machine to do this. the lens is about the size of a pencil
eraser, and is on a suspension, so be gentle with it. I use a cotton
swab moistened with lens cleaning fluid, though Windex will probably do.
I also clean off the platter that the disc sits on while spinning.
I've seen enough debris build up on the platter over time that it no
longer lets the disc sit flat, and that can cause all kinds of grief.
Again, a moistened swab or slightly damp cloth is all you need to clean it.

Beyond that, you are likely to have a worn out laser, which is likely
to be more expensive to replace than the machine is worth.

Regards,
Tim Schwartz
Bristol Electronics

Jeff Liebermann · Feb 20, 2011

On Sun, 20 Feb 2011 14:13:20 -0600, "Shaun" <rowl@nomail.com> wrote:

I have a used ADCOM GCD-700 5 disk CD player that was given to me and it is
overly sensitive to vibrations, bumps and slight scratches on the CDs. I've
mounted it on vibration absorbing rubber and this has greatly impoved its
bump and vibration sensitivity, but it is still very sensitive to the
slightest mark or scratch on cds. How can I cure this.

First, clean out any crud from the laser head assembly. If that
doesn't improve things, replace it. That's a 1997 vintage machine so
parts may be tricky to find... Oh, too easy:
<http://www.adcomparts.com/part.php?item=46001400>
However, I don't think it's worth $50 to fix something that old.

More:
<http://www.fixya.com/support/p134391-adcom_gcd_700_5_disc_cd_changer>
<http://www.fixya.com/support/t648590-adcom_gcd_700_tracking_problems>

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Shaun · Feb 20, 2011

"Tim Schwartz" <tim@bristolnj.com> wrote in message
news:ijs5q6$u71$1@news.eternal-september.org...

On 2/20/2011 3:13 PM, Shaun wrote:
Hello,

I have a used ADCOM GCD-700 5 disk CD player that was given to me and it
is
overly sensitive to vibrations, bumps and slight scratches on the CDs.
I've
mounted it on vibration absorbing rubber and this has greatly impoved its
bump and vibration sensitivity, but it is still very sensitive to the
slightest mark or scratch on cds. How can I cure this.

thanks in advance,

Shaun

Shaun,

If this machine is as old as I think it is, then its not worth putting any
serious money into it. There is likely a manufacturing date on the
machine that will give the month and year it was made. Make sure if there
are any transit screws on the bottom they are removed or in the released
position.

You could try cleaning the lens and the disc platter. You'd have to open
the machine to do this. the lens is about the size of a pencil eraser,
and is on a suspension, so be gentle with it. I use a cotton swab
moistened with lens cleaning fluid, though Windex will probably do. I also
clean off the platter that the disc sits on while spinning. I've seen
enough debris build up on the platter over time that it no longer lets the
disc sit flat, and that can cause all kinds of grief. Again, a moistened
swab or slightly damp cloth is all you need to clean it.

Beyond that, you are likely to have a worn out laser, which is likely to
be more expensive to replace than the machine is worth.

Regards,
Tim Schwartz
Bristol Electronics

This CD player is a higher quality model and one of the only multidisk units
that uses high quality components. Mechanically it's not made very well
though, but the electronic audio stages are all class A, so it's worth my
time and some money to try to fix it.

Thanks for your reply.

Shaun

Shaun · Feb 20, 2011

"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:4673m6prr0ls8tlmj1kaaa2rid3sbapos7@4ax.com...

On Sun, 20 Feb 2011 14:13:20 -0600, "Shaun" <rowl@nomail.com> wrote:

I have a used ADCOM GCD-700 5 disk CD player that was given to me and it
is
overly sensitive to vibrations, bumps and slight scratches on the CDs.
I've
mounted it on vibration absorbing rubber and this has greatly impoved its
bump and vibration sensitivity, but it is still very sensitive to the
slightest mark or scratch on cds. How can I cure this.

First, clean out any crud from the laser head assembly. If that
doesn't improve things, replace it. That's a 1997 vintage machine so
parts may be tricky to find... Oh, too easy:
http://www.adcomparts.com/part.php?item=46001400
However, I don't think it's worth $50 to fix something that old.

More:
http://www.fixya.com/support/p134391-adcom_gcd_700_5_disc_cd_changer
http://www.fixya.com/support/t648590-adcom_gcd_700_tracking_problems

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Thanks for the links, I'll probably order a new laser head for it, but first
I'll lake it apart and clean the lenses.

Shaun

Mark Zacharias · Feb 21, 2011

"Shaun" <rowl@nomail.com> wrote in message
news:yOh8p.17738$D94.1575@newsfe20.iad...

"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:4673m6prr0ls8tlmj1kaaa2rid3sbapos7@4ax.com...
On Sun, 20 Feb 2011 14:13:20 -0600, "Shaun" <rowl@nomail.com> wrote:

I have a used ADCOM GCD-700 5 disk CD player that was given to me and it
is
overly sensitive to vibrations, bumps and slight scratches on the CDs.
I've
mounted it on vibration absorbing rubber and this has greatly impoved its
bump and vibration sensitivity, but it is still very sensitive to the
slightest mark or scratch on cds. How can I cure this.

First, clean out any crud from the laser head assembly. If that
doesn't improve things, replace it. That's a 1997 vintage machine so
parts may be tricky to find... Oh, too easy:
http://www.adcomparts.com/part.php?item=46001400
However, I don't think it's worth $50 to fix something that old.

More:
http://www.fixya.com/support/p134391-adcom_gcd_700_5_disc_cd_changer
http://www.fixya.com/support/t648590-adcom_gcd_700_tracking_problems

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Thanks for the links, I'll probably order a new laser head for it, but
first I'll lake it apart and clean the lenses.

Shaun

Absolutely clean it. Should help.

Mark Z.

Arfa Daily · Feb 21, 2011

"Shaun" <rowl@nomail.com> wrote in message
news:yOh8p.17738$D94.1575@newsfe20.iad...

"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:4673m6prr0ls8tlmj1kaaa2rid3sbapos7@4ax.com...
On Sun, 20 Feb 2011 14:13:20 -0600, "Shaun" <rowl@nomail.com> wrote:

I have a used ADCOM GCD-700 5 disk CD player that was given to me and it
is
overly sensitive to vibrations, bumps and slight scratches on the CDs.
I've
mounted it on vibration absorbing rubber and this has greatly impoved its
bump and vibration sensitivity, but it is still very sensitive to the
slightest mark or scratch on cds. How can I cure this.

First, clean out any crud from the laser head assembly. If that
doesn't improve things, replace it. That's a 1997 vintage machine so
parts may be tricky to find... Oh, too easy:
http://www.adcomparts.com/part.php?item=46001400
However, I don't think it's worth $50 to fix something that old.

More:
http://www.fixya.com/support/p134391-adcom_gcd_700_5_disc_cd_changer
http://www.fixya.com/support/t648590-adcom_gcd_700_tracking_problems

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Thanks for the links, I'll probably order a new laser head for it, but
first I'll lake it apart and clean the lenses.

Shaun

KSS240A lasers should be available from many sources for much less than $50.
This is a very 'bog-standard' laser made by Sony, and used in many
manufacturers' products over the years, as well as their own. Try to make
sure if you get one from a cheaper source, that it is a genuine Sony one
though. Of all of the KSS series replacement lasers, I've found the '240 to
be probably the most critical, when used in most manufacturers' machines.

Arfa

Jeff Liebermann · Feb 21, 2011

On Mon, 21 Feb 2011 02:10:14 -0000, "Arfa Daily"
<arfa.daily@ntlworld.com> wrote:

KSS240A lasers should be available from many sources for much less than $50.
This is a very 'bog-standard' laser made by Sony, and used in many
manufacturers' products over the years, as well as their own. Try to make
sure if you get one from a cheaper source, that it is a genuine Sony one
though. Of all of the KSS series replacement lasers, I've found the '240 to
be probably the most critical, when used in most manufacturers' machines.

Oops. I didn't recognize the Sony part number. Plenty all over the
web
<http://www.google.com/images?hl=en&q=KSS-240A>
and $17-$31 on eBay.
<http://shop.ebay.com/i.html?_nkw=kss-240a>

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

N_Cook · Feb 21, 2011

Shaun <rowl@nomail.com> wrote in message
news:yOh8p.17738$D94.1575@newsfe20.iad...

"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:4673m6prr0ls8tlmj1kaaa2rid3sbapos7@4ax.com...
On Sun, 20 Feb 2011 14:13:20 -0600, "Shaun" <rowl@nomail.com> wrote:

I have a used ADCOM GCD-700 5 disk CD player that was given to me and it
is
overly sensitive to vibrations, bumps and slight scratches on the CDs.
I've
mounted it on vibration absorbing rubber and this has greatly impoved
its
bump and vibration sensitivity, but it is still very sensitive to the
slightest mark or scratch on cds. How can I cure this.

First, clean out any crud from the laser head assembly. If that
doesn't improve things, replace it. That's a 1997 vintage machine so
parts may be tricky to find... Oh, too easy:
http://www.adcomparts.com/part.php?item=46001400
However, I don't think it's worth $50 to fix something that old.

More:
http://www.fixya.com/support/p134391-adcom_gcd_700_5_disc_cd_changer
http://www.fixya.com/support/t648590-adcom_gcd_700_tracking_problems

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Thanks for the links, I'll probably order a new laser head for it, but
first
I'll lake it apart and clean the lenses.

Shaun

Then after cleaning and before ditching. Find the "power pot" ,measure
resistance with a DVM , "both ways" in case of a difference, so you can get
back to that value. Change the value , no more than 5 percent, to see if it
improves error proneness

Arfa Daily · Feb 22, 2011

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:ijtmjf$g22$1@news.eternal-september.org...

Shaun <rowl@nomail.com> wrote in message
news:yOh8p.17738$D94.1575@newsfe20.iad...

"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:4673m6prr0ls8tlmj1kaaa2rid3sbapos7@4ax.com...
On Sun, 20 Feb 2011 14:13:20 -0600, "Shaun" <rowl@nomail.com> wrote:

I have a used ADCOM GCD-700 5 disk CD player that was given to me and
it
is
overly sensitive to vibrations, bumps and slight scratches on the CDs.
I've
mounted it on vibration absorbing rubber and this has greatly impoved
its
bump and vibration sensitivity, but it is still very sensitive to the
slightest mark or scratch on cds. How can I cure this.

First, clean out any crud from the laser head assembly. If that
doesn't improve things, replace it. That's a 1997 vintage machine so
parts may be tricky to find... Oh, too easy:
http://www.adcomparts.com/part.php?item=46001400
However, I don't think it's worth $50 to fix something that old.

More:
http://www.fixya.com/support/p134391-adcom_gcd_700_5_disc_cd_changer
http://www.fixya.com/support/t648590-adcom_gcd_700_tracking_problems

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Thanks for the links, I'll probably order a new laser head for it, but
first
I'll lake it apart and clean the lenses.

Shaun

Then after cleaning and before ditching. Find the "power pot" ,measure
resistance with a DVM , "both ways" in case of a difference, so you can
get
back to that value. Change the value , no more than 5 percent, to see if
it
improves error proneness

It's not quite that straightforward on a '240, as there are three pots on
there, and considerable interaction between them. I would not recommend
touching them, as at least one of them is *extremely* critical in its
setting to get the thing to play at all.

Arfa

N_Cook · Feb 22, 2011

Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:msF8p.28752$Xf4.24541@newsfe13.ams2...

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:ijtmjf$g22$1@news.eternal-september.org...
Shaun <rowl@nomail.com> wrote in message
news:yOh8p.17738$D94.1575@newsfe20.iad...

"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:4673m6prr0ls8tlmj1kaaa2rid3sbapos7@4ax.com...
On Sun, 20 Feb 2011 14:13:20 -0600, "Shaun" <rowl@nomail.com> wrote:

I have a used ADCOM GCD-700 5 disk CD player that was given to me and
it
is
overly sensitive to vibrations, bumps and slight scratches on the
CDs.
I've
mounted it on vibration absorbing rubber and this has greatly impoved
its
bump and vibration sensitivity, but it is still very sensitive to the
slightest mark or scratch on cds. How can I cure this.

First, clean out any crud from the laser head assembly. If that
doesn't improve things, replace it. That's a 1997 vintage machine so
parts may be tricky to find... Oh, too easy:
http://www.adcomparts.com/part.php?item=46001400
However, I don't think it's worth $50 to fix something that old.

More:

http://www.fixya.com/support/p134391-adcom_gcd_700_5_disc_cd_changer

http://www.fixya.com/support/t648590-adcom_gcd_700_tracking_problems

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Thanks for the links, I'll probably order a new laser head for it, but
first
I'll lake it apart and clean the lenses.

Shaun

Then after cleaning and before ditching. Find the "power pot" ,measure
resistance with a DVM , "both ways" in case of a difference, so you can
get
back to that value. Change the value , no more than 5 percent, to see if
it
improves error proneness

It's not quite that straightforward on a '240, as there are three pots on
there, and considerable interaction between them. I would not recommend
touching them, as at least one of them is *extremely* critical in its
setting to get the thing to play at all.

Arfa

Which implies 3 analoguey things that could drift over time. I would take 3x
0.1 percent measurements and tabulate some twiddlings v drop-out time of a
known bad ie deliberately scratched track on a CD. As last legs anyway,
nothing to loose except a bit of time

Shaun · Feb 24, 2011

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:ijvrhs$oe5$1@news.eternal-september.org...

Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:msF8p.28752$Xf4.24541@newsfe13.ams2...

"N_Cook" <diverse@tcp.co.uk> wrote in message
news:ijtmjf$g22$1@news.eternal-september.org...
Shaun <rowl@nomail.com> wrote in message
news:yOh8p.17738$D94.1575@newsfe20.iad...

"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:4673m6prr0ls8tlmj1kaaa2rid3sbapos7@4ax.com...
On Sun, 20 Feb 2011 14:13:20 -0600, "Shaun" <rowl@nomail.com> wrote:

I have a used ADCOM GCD-700 5 disk CD player that was given to me
and
it
is
overly sensitive to vibrations, bumps and slight scratches on the
CDs.
I've
mounted it on vibration absorbing rubber and this has greatly
impoved
its
bump and vibration sensitivity, but it is still very sensitive to
the
slightest mark or scratch on cds. How can I cure this.

First, clean out any crud from the laser head assembly. If that
doesn't improve things, replace it. That's a 1997 vintage machine
so
parts may be tricky to find... Oh, too easy:
http://www.adcomparts.com/part.php?item=46001400
However, I don't think it's worth $50 to fix something that old.

More:

http://www.fixya.com/support/p134391-adcom_gcd_700_5_disc_cd_changer

http://www.fixya.com/support/t648590-adcom_gcd_700_tracking_problems

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

Thanks for the links, I'll probably order a new laser head for it, but
first
I'll lake it apart and clean the lenses.

Shaun

Then after cleaning and before ditching. Find the "power pot" ,measure
resistance with a DVM , "both ways" in case of a difference, so you can
get
back to that value. Change the value , no more than 5 percent, to see
if
it
improves error proneness

It's not quite that straightforward on a '240, as there are three pots on
there, and considerable interaction between them. I would not recommend
touching them, as at least one of them is *extremely* critical in its
setting to get the thing to play at all.

Arfa

Which implies 3 analoguey things that could drift over time. I would take
3x
0.1 percent measurements and tabulate some twiddlings v drop-out time of a
known bad ie deliberately scratched track on a CD. As last legs anyway,
nothing to loose except a bit of time

I'm sure I can find a few CDs that are scratched in my collection.

shaun

problems with my Adcom CD player

Shaun

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