Hi!

I have the above mentioned CD player, pulled from a soggy cardboard box on
trash day, along with some computer monitors and other stuff. The monitors
have all been fine apart from some cleaning and the VCR has been working
fine after I got it dried out. That leaves me with the CD player. It looks
to be in awfully good condition for its age (not a scratch anywhere on it,
not even on the display panel) and it powers right up with no problem. At
present it has no problem reading the index of a disc, and it will play the
middle and end of a disc with no problems. The only thing it won't do is
play the beginning of a disc. I can see the spindle motor spin up and down
and I can hear the laser sled moving around from time to time as the motor
speeds up and down.

I can only see one thing that's amiss when all of this is going on. The
spindle motor seems to be having some moderate degree of difficulty coming
up to speed. It seems to do so for the most part, but it takes what I feel
is a rather long time. I am thinking that the spindle motor could be
partially shorted and in need of a cleaning. I cannot check the temperatures
of any driver components at present, because the components are on "the
wrong side" of the boards.

What I'm looking for is anyone who might have a CD player similar to this
one in working order, for reference purposes. I'm curious how quickly the
spindle motor in your player takes to come up to speed. If there is anyone
out there who has seen a similar problem (like what are my chances...but
there's no harm in asking...) with this player?

Thanks in advance for any thoughts, tips, etc!

William

Don't have any past experience with yours, but could be caused by the
Servo Output IC. Chase the cables that lead from the drive to the main
board, I'm sure the Servo IC will stick out like a sore thumb from
there. Also check in that vicinity for signs of resistors that may have
changed color, most likely not obvious with the naked eye, best to
check them for tolerance. They should be resistors in the circuit
between the IC and the motor itself.

It's not the servo IC. Maybe a lubrication issue, many old Technics models,
including I THINK yours, used direct-drive spindle motors.
The sled drive wormscrews got bad lube and bad belts as well. Of course the
optic should be cleaned.

Mark Z.

"majortom" wrote in message
oups.com...
Don't have any past experience with yours, but could be caused by the
Servo Output IC. Chase the cables that lead from the drive to the main
board, I'm sure the Servo IC will stick out like a sore thumb from
there. Also check in that vicinity for signs of resistors that may have
changed color, most likely not obvious with the naked eye, best to
check them for tolerance. They should be resistors in the circuit
between the IC and the motor itself.

The SLP101 has a linear motor tracking sled, so the lubrication of the guide rails is critical.
Takes a very specific grease/oil(Panasonic molytone) to make it work properly. Probably the
cause of the problem. With the unit unpowered, picking up the front of the unit 2-3" should
make the laser slide smoothly from front to back, and vice versa picking up the back end.
Otherwise, needs lube.

--
Stephen Sank, Owner & Ribbon Mic Restorer
Talking Dog Transducer Company
http://stephensank.com
5517 Carmelita Drive N.E.
Albuquerque, New Mexico [87111]
505-332-0336
Auth. Nakamichi & McIntosh servicer
Payments preferred through Paypal.com
"Mark D. Zacharias" wrote in message ...
It's not the servo IC. Maybe a lubrication issue, many old Technics models,
including I THINK yours, used direct-drive spindle motors.
The sled drive wormscrews got bad lube and bad belts as well. Of course the
optic should be cleaned.

Mark Z.

"majortom" wrote in message
oups.com...
Don't have any past experience with yours, but could be caused by the
Servo Output IC. Chase the cables that lead from the drive to the main
board, I'm sure the Servo IC will stick out like a sore thumb from
there. Also check in that vicinity for signs of resistors that may have
changed color, most likely not obvious with the naked eye, best to
check them for tolerance. They should be resistors in the circuit
between the IC and the motor itself.

"majortom" writes:

Don't have any past experience with yours, but could be caused by the
Servo Output IC. Chase the cables that lead from the drive to the main
board, I'm sure the Servo IC will stick out like a sore thumb from
there. Also check in that vicinity for signs of resistors that may have
changed color, most likely not obvious with the naked eye, best to
check them for tolerance. They should be resistors in the circuit
between the IC and the motor itself.

More likely cause is that the spindle motor is partially shorted. See:

http://repairfaq.ece.drexel.edu/sam/cdfaq.htm#cdpwspmm

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.

"William R. Walsh" writes:

Hi!

I have the above mentioned CD player, pulled from a soggy cardboard box on
trash day, along with some computer monitors and other stuff. The monitors
have all been fine apart from some cleaning and the VCR has been working
fine after I got it dried out. That leaves me with the CD player. It looks
to be in awfully good condition for its age (not a scratch anywhere on it,
not even on the display panel) and it powers right up with no problem. At
present it has no problem reading the index of a disc, and it will play the
middle and end of a disc with no problems. The only thing it won't do is
play the beginning of a disc. I can see the spindle motor spin up and down
and I can hear the laser sled moving around from time to time as the motor
speeds up and down.

I can only see one thing that's amiss when all of this is going on. The
spindle motor seems to be having some moderate degree of difficulty coming
up to speed. It seems to do so for the most part, but it takes what I feel
is a rather long time. I am thinking that the spindle motor could be
partially shorted and in need of a cleaning. I cannot check the temperatures
of any driver components at present, because the components are on "the
wrong side" of the boards.

What I'm looking for is anyone who might have a CD player similar to this
one in working order, for reference purposes. I'm curious how quickly the
spindle motor in your player takes to come up to speed. If there is anyone
out there who has seen a similar problem (like what are my chances...but
there's no harm in asking...) with this player?

Thanks in advance for any thoughts, tips, etc!

It may be a partially shorted spindle motor - very common in many CD players.

See: http://repairfaq.ece.drexel.edu/sam/cdfaq.htm#cdpwspmm

The spindle motor has to spin faster on the inner tracks and can't make it.

I doubt it's the servo IC as someone else mentioned. Could be mechanical
though - deteriorated rubber parts, gummed up grease, etc.

--- sam | Sci.Electronics.Repair FAQ Mirror: http://repairfaq.ece.drexel.edu/
Repair | Main Table of Contents: http://repairfaq.ece.drexel.edu/REPAIR/
+Lasers | Sam's Laser FAQ: http://repairfaq.ece.drexel.edu/sam/lasersam.htm
| Mirror Sites: http://repairfaq.ece.drexel.edu/REPAIR/F_mirror.html

Note: These links are hopefully temporary until we can sort out the excessive
traffic on Repairfaq.org.

Important: Anything sent to the email address in the message header above is
ignored unless my full name is included in the subject line. Or, you can
contact me via the Feedback Form in the FAQs.

Hi!

Thanks to everyone for their excellent tips. I was leaning toward a shorted
spindle motor, but the fact that the index was always read successfully made
me wonder if that was really the problem.

Cleaning the lens gave very little improvement and I did make sure it could
slide back and forth freely. I started in to disconnecting all the cabling
leading to the CD player mechanism and just as a guess, I reseated all of
the connectors before taking the whole thing out to deal with the spindle
motor. I couldn't see anything wrong with any of them, but the player is
working perfectly now. There is no hesitation to spin up now, and the
seeking seems to happen very quickly.

I have never seen a player made quite like this one. It seems that the
spindle motor servo controller is mounted to a circuit board that the
spindle motor is also soldered directly to.

William