Compact disc doesn't spin

G

GARY

Guest
On a Sharp Mini Component System (model CD-C420), the compact disc
turns very slowly or moves only about 1" and then stops.

How can I check to see if something is slipping? Is there a belt?
 
GARY wrote:
On a Sharp Mini Component System (model CD-C420), the compact disc
turns very slowly or moves only about 1" and then stops.

How can I check to see if something is slipping? Is there a belt?
Click to expand...
I would doubt there is any belt. More likely the spindle motor's
lubrication has dried up too much.

In some cases these motors can be taken apart and relubed, but this is
not a job for the squeamish! Too many things can go wrong...

I'd attempt it on my own gear, and have been successful, but I fix
things all day long, so have lots of practice in taking things apart in
such a way that they are likely to work when I put them back together.

John :-#)#

--
(Please post followups or tech enquiries to the newsgroup)
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, Video Games)
www.flippers.com
"Old pinballers never die, they just flip out."
 
GARY wrote:
On a Sharp Mini Component System (model CD-C420), the compact disc
turns very slowly or moves only about 1" and then stops.

How can I check to see if something is slipping? Is there a belt?
Click to expand...
That is because you did not finalize the CD-R. Put the CD-R back in the
computer and use Windows to finalize the disk.
 
GARY wrote:

On a Sharp Mini Component System (model CD-C420), the compact disc
turns very slowly or moves only about 1" and then stops.

How can I check to see if something is slipping? Is there a belt?
Click to expand...
Maybe the disc is not recognized because the lens is dirty or the laser too
weak.

Does this happen with real CDs or only with CD-R? The latter is reflecting
less light and thus causes more problems.


Stefan
 
They are real CDs (which contain music, audio-books, etc); they are
not recordable CDs (CD-Rs).
 
On Mon, 07 Mar 2011 20:29:27 -0800, GARY wrote:

On a Sharp Mini Component System (model CD-C420), the compact disc turns
very slowly or moves only about 1" and then stops.

How can I check to see if something is slipping? Is there a belt?
Click to expand...
No belt, direct drive. Any error code on the display like LO1 RO1 ?



--
Live Fast, Die Young and Leave a Pretty Corpse
 
No error-code.

After the 3 discs are cycled over the lens, the display says "No
Disc".
 
After the 3 discs are cycled over the lens,
the display says "No Disc".
Click to expand...
Logic suggests that the player is not "seeing" the disks. You might have
problems with the laser other than it being dirty.
 
On Tue, 08 Mar 2011 10:36:44 -0800, GARY wrote:

No error-code.

After the 3 discs are cycled over the lens, the display says "No Disc".
Click to expand...
You've got problems in the logic portion. If it were a laser problem the
disc would rotate and the sled would slide the laser block in and out
looking for a disc ID. A logic failure might mean a total failure of
this initialization procedure. There may be a small switch or optical
sensor telling the logic control that there are discs loaded. I think I
would start there given the symptoms.



--
Live Fast, Die Young and Leave a Pretty Corpse
 
On Mar 8, 2:54 am, Christen Alex <clamchell...@yahoo.com.au> wrote:
GARY wrote:
On a Sharp Mini Component System (model CD-C420), the compact disc
turns very slowly or moves only about 1" and then stops.

How can I check to see if something is slipping?  Is there a belt?

That is because you did not finalize the CD-R. Put the CD-R back in the
computer and use Windows to finalize the disk.
Click to expand...
If you read the previous post, you'll see it is NOT a computer and the
discs are NOT CD-Rs.
 
To Christian Alex:

If you read the previous posts, you'll see it is NOT a computer and
the
discs are NOT CD-Rs.
 
"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2011.03.08.21.19.58@lmao.lol.lol...
On Tue, 08 Mar 2011 10:36:44 -0800, GARY wrote:

No error-code.

After the 3 discs are cycled over the lens, the display says "No Disc".

You've got problems in the logic portion. If it were a laser problem the
disc would rotate and the sled would slide the laser block in and out
looking for a disc ID.
Click to expand...
Often not the case, Meat. Many players will not start to spin the disc up or
move the laser down its slides, unless focus lock is obtained, The movement
of about an inch is often an attempt to move the disc to a different spot to
retry the initial focusing operation, in case the original spot on the disc
was dirty or damaged. This small movement of the disc may be carried out
just the once, or several times before it gives up and declares there to be
no disc ...

Just as a matter of interest, why has the OP started a new thread, instead
of continuing with his original, also called "Compact disc doesn't spin"
started two days ago ?

Arfa
 
"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:_QAdp.112493$P95.86409@newsfe05.ams2...
"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2011.03.08.21.19.58@lmao.lol.lol...
On Tue, 08 Mar 2011 10:36:44 -0800, GARY wrote:

No error-code.

After the 3 discs are cycled over the lens, the display says "No Disc".

You've got problems in the logic portion. If it were a laser problem the
disc would rotate and the sled would slide the laser block in and out
looking for a disc ID.

Often not the case, Meat. Many players will not start to spin the disc up
or move the laser down its slides, unless focus lock is obtained, The
movement of about an inch is often an attempt to move the disc to a
different spot to retry the initial focusing operation, in case the
original spot on the disc was dirty or damaged. This small movement of the
disc may be carried out just the once, or several times before it gives up
and declares there to be no disc ...

Just as a matter of interest, why has the OP started a new thread, instead
of continuing with his original, also called "Compact disc doesn't spin"
started two days ago ?

Arfa
Click to expand...
Beg ya pardon. Actually called "Disc tray won't open"

Arfa
 
The original problem was the disc tray wouldn't open.

After that posting, I removed the top of the unit and discovered that
4 discs had been inserted (instead of only 3). By removing the extra
disc, the disc tray then would open..

Since the original problem had been solved, I started a new thread
describing the new problem: the compact disc wouldn't spin.
 
"GARY" <gcotterl@co.riverside.ca.us> wrote in message
news:d5c765b8-246e-412e-b11b-fbec33273027@j13g2000pro.googlegroups.com...
The original problem was the disc tray wouldn't open.

After that posting, I removed the top of the unit and discovered that
4 discs had been inserted (instead of only 3). By removing the extra
disc, the disc tray then would open..

Since the original problem had been solved, I started a new thread
describing the new problem: the compact disc wouldn't spin.
Click to expand...
Okey dokey. But as you already said this in the original thread, that's
where I posted my original reply regarding this 'new' problem. Did you see
that ?

Arfa
 
GARY wrote:

After that posting, I removed the top of the unit and discovered that
4 discs had been inserted (instead of only 3). By removing the extra
disc, the disc tray then would open..
Click to expand...
Maybe the additional disc that was jammed bent, scratched or broke off part
of the optical system? The lens should be able to slightly move in all
directions. When started, the player usually first tries to adjust the focus
by moving the lens up and down. Does it do that?
 
On Mar 9, 2:51 am, Stefan Heimers <stefan.use...@heimers.ch> wrote:
GARY wrote:
After that posting, I removed the top of the unit and discovered that
4 discs had been inserted (instead of only 3).  By removing the extra
disc, the disc tray then would open..

Maybe the additional disc that was jammed bent, scratched or broke off part
of the optical system? The lens should be able to slightly move in all
directions. When started, the player usually first tries to adjust the focus
by moving the lens up and down. Does it do that?
Click to expand...

Yes, the lens move up and down.
 
On Mar 9, 2:51 am, Stefan Heimers <stefan.use...@heimers.ch> wrote:
GARY wrote:
After that posting, I removed the top of the unit and discovered that
4 discs had been inserted (instead of only 3).  By removing the extra
disc, the disc tray then would open..

Maybe the additional disc that was jammed bent, scratched or broke off part
of the optical system? The lens should be able to slightly move in all
directions. When started, the player usually first tries to adjust the focus
by moving the lens up and down. Does it do that?
Click to expand...
Yes, the lens moves up and down.
 
On Wed, 09 Mar 2011 01:36:57 +0000, Arfa Daily wrote:

"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2011.03.08.21.19.58@lmao.lol.lol...
On Tue, 08 Mar 2011 10:36:44 -0800, GARY wrote:

No error-code.

After the 3 discs are cycled over the lens, the display says "No
Disc".

You've got problems in the logic portion. If it were a laser problem
the disc would rotate and the sled would slide the laser block in and
out looking for a disc ID.

Often not the case, Meat. Many players will not start to spin the disc
up or move the laser down its slides, unless focus lock is obtained, The
movement of about an inch is often an attempt to move the disc to a
different spot to retry the initial focusing operation, in case the
original spot on the disc was dirty or damaged. This small movement of
the disc may be carried out just the once, or several times before it
gives up and declares there to be no disc ...

Just as a matter of interest, why has the OP started a new thread,
instead of continuing with his original, also called "Compact disc
doesn't spin" started two days ago ?

Arfa
Click to expand...
I must be thinking of a DVD. Looking at this portable player with a
window to see the disk as soon as the lid is closed the disc rotates
and then the sled moves in and out. Been too long since I've worked on a
CD player to remember if they do the same I guess.



--
Live Fast Die Young, Leave A Pretty Corpse
 
"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2011.03.09.20.48.12@lmao.lol.lol...
On Wed, 09 Mar 2011 01:36:57 +0000, Arfa Daily wrote:

"Meat Plow" <mhywatt@yahoo.com> wrote in message
news:pan.2011.03.08.21.19.58@lmao.lol.lol...
On Tue, 08 Mar 2011 10:36:44 -0800, GARY wrote:

No error-code.

After the 3 discs are cycled over the lens, the display says "No
Disc".

You've got problems in the logic portion. If it were a laser problem
the disc would rotate and the sled would slide the laser block in and
out looking for a disc ID.

Often not the case, Meat. Many players will not start to spin the disc
up or move the laser down its slides, unless focus lock is obtained, The
movement of about an inch is often an attempt to move the disc to a
different spot to retry the initial focusing operation, in case the
original spot on the disc was dirty or damaged. This small movement of
the disc may be carried out just the once, or several times before it
gives up and declares there to be no disc ...

Just as a matter of interest, why has the OP started a new thread,
instead of continuing with his original, also called "Compact disc
doesn't spin" started two days ago ?

Arfa

I must be thinking of a DVD. Looking at this portable player with a
window to see the disk as soon as the lid is closed the disc rotates
and then the sled moves in and out. Been too long since I've worked on a
CD player to remember if they do the same I guess.



No, no. You're quite right. Some players do just go ahead and spin the disc
Click to expand...
up regardless, but by far the most common scheme is to first home the laser,
which is usually just a little shuffle if it's already home, then to obtain
focus, and when that is achieved, spin up the disc and get the tracking
servo locked before finally starting to read data to extract the timing for
the spindle servo. Once all of that is acomplished, the TOC is read in.

Arfa
 
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