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?

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?

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?

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?

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".

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".

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 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.

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" wrote in message
news
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

"Arfa Daily" wrote in message
...


"Meat Plow" wrote in message
news
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


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" wrote in message
...
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.


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..

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 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?


Yes, the lens move up and down.

On Mar 9, 2:51*am, Stefan Heimers 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?

Yes, the lens moves up and down.

On Wed, 09 Mar 2011 01:36:57 +0000, Arfa Daily wrote:

"Meat Plow" wrote in message
news
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.



--
Live Fast Die Young, Leave A Pretty Corpse

"Meat Plow" wrote in message
news
On Wed, 09 Mar 2011 01:36:57 +0000, Arfa Daily wrote:

"Meat Plow" wrote in message
news
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
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

On Thu, 10 Mar 2011 02:09:10 +0000, Arfa Daily wrote:

"Meat Plow" wrote in message
news
On Wed, 09 Mar 2011 01:36:57 +0000, Arfa Daily wrote:

"Meat Plow" wrote in message
news 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 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

Got it. I always assumed the laser needed a spin to focus. Working on
those things back in the 80's when they first hit the market and the vast
majority were warranty items it was more time effective to just shotgun
the entire mechanism than to spend more than 10 minutes troubleshooting.
I made the most money per piece with a horribly low minimum wage salary.
And the facility was well stocked with factory replacements. So it was
check a mental flow chart, if it was a tweak or a mechanical problem that
could be buttoned up in 15 minutes then it actually got some repair.
Otherwise it was pulled and replaced. So even though countless boxed units
from several retail chains made it to my work area, I didn't have the
time to get real intimate with the workings. By the 90's I switch from
consumer to pro audio repair for a friend who did Yamaha warranty. Better
pay and I got to spend more time with power amps, synths, etc...



--
Live Fast Die Young, Leave A Pretty Corpse

On Mar 8, 5:29*am, 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?

first things first. get a q tip and moisten it with some isopropyl
alcohol or tape head cleaner. gently clean the lens and try again.
if no joy, then you may need to replace the ribbon cable or optical
block. some units come with the whole motor/sled/block and pcb as one,
others not.
In some cases, a bad spindle motor can give what you describe. common
in cheap dvd players. If the psu strains as the dic tries to spin,
then more so!

-B