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Old 28th April 2013, 06:32 PM   #1
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Default Sony CDP-101 spindle motor

is there someone of you who had repaired this problem ?
when I turn on my CD player SONY CDP-101, the spindle motor spins very fast and spins from turning on the CD player without any chance to stop it.
I have changed IC-201 (CX-193 - disc motor servo) without luck, the IC-201 is OK.
does anyone know the right answer what is wrong?
thank you
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Old 28th April 2013, 07:16 PM   #2
Salar is offline Salar  Germany
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When it spins very fast when a CD is inserted, E-F Balance might be off.
This happened to me, whe I tried to align a Sony-based nakamichi player.
Maybe, with a balanced power supply, one supply does not work.
But I am, not a technician.
I was very, very surprised to see one CDP-101 in a shop called "Haus der Musik" in Bonn, Germany.
It was September 2012.
They do not sell used gear and it stood there like they had forgotten to sell it for 30 years. Contacted them later to ask for a price but they never mailed back.
Maybe a chace for you to get a working one...

Last edited by Salar; 28th April 2013 at 07:22 PM.
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Old 28th April 2013, 07:58 PM   #3
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I think I forgot to write the spindle motor spins straight from turning on CD player (pressing POWER button). normally from turning on the CD player the spindle motor does not run, then after loading CD in tray and detecting CD the spindle motor begins to spin with constant speed to load TOC and then by pressing PLAY button spins again.
but in my case it spins straight from turning on the CD player without a chance to stop it. it does not depend on if the CD is in the tray or not. it runs and runs
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Old 28th April 2013, 09:23 PM   #4
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written before hifi_sk's last post...

Manual in German and English, and Sony's own "Troubleshooting Guide", are available at There's a supplement at the end of the service manual with revisions and later circuit mods.

There are a few possible causes of your problem. This machine uses a LED and phototransistor to sense the presence of a disk, so spinning may not be an indication that other parts of the start-up procedure have completed successfully. Was the machine working before this fault appeared? If not, or you don't know, then you should start by making sure as far as you can that the mechanics are properly adjusted and moving freely as shown in the service manual. Then keep following the manual through laser and focus check, until you get to the adjustments that need the machine to be playing, which you can't do if your fault is also present in "adjustment mode".

There is an explanation in the manual of the role of the PLL clock, and in particular its free-running frequency, but I don't quite follow what it means. Normally, the disk speeds up until the data rate matches the PLL frequency. Initially, until the PLL locks, the free-running frequency is used. Until it locks onto what, I wonder, and when? Anyway, you might check the PLL is running.

Somewere on the net there's a little list of common faults and solutions, made IIRC by a service engineer, but I've lost the link.

My CDP101 spins fast at the end of its "getting totally lost" procedure, initiated occasionally when searching for distant tracks. Once the disk reaches take-off speed, it lifts it up, flings it forward, and jams it in the opening drawer. Maybe yours starts from the totally lost position. If the chip you just replaced were at fault, the machine should have ejected after 6 seconds.

There's lots of subcircuits involved in the start-up procedure, so unless someone is familiar with this particular problem, I can only suggest that you check power supply voltages and then soldier on through the troubleshooting guide.

There were two failing electrolytics in my power supply, btw. Access is a nightmare. The glue used to stick wires and caps in place has become corrosive, so you should remove it as much as you can, and particularly away from metal. It can eat the tin off a pin all the way through the board and out the other side of the joint, so watch out for that whilst you're in there.

Last edited by PlasticIsGood; 28th April 2013 at 09:27 PM.
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Old 29th April 2013, 06:51 AM   #5
Mooly is offline Mooly  United Kingdom
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Check the four supplies are correct at the motor itself. Confirm that the motor control input pin is at zero volts. If those are OK and the motor still spins then there is an internal problem in the hall effect motor.

Q202 should be on with the collector at zero volts DC. In that condition the motor is braked.
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Old 29th April 2013, 08:01 PM   #6
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many thanks for your advices. i am busy in work, have a family but evenings when little princess sleep i can for a while measuring on CDP.
so i observed today almost everything around the IC-201 and i measure these :
on IC-201:
-pin 6 is 5,4V instead of 0V
-pin 21 is 5,7V instead of 0V
-pin 23 is is 0V instead of 1,3V
-pin 24 is 0V instead of of 0,4V
-in all other pins is voltage OK

i have measure even 2 pins i suggest is in relation with spindle motor driver on IC-101:
-pin 31 (DISC STOP) - 4,15V OK
-pin 19 (BRAKE) - 0,66V OK

voltage on Q202:
-collector - 0V OK
-base - 0,66V OK

voltage on Q201:
-collector - 0V OK
-base - 0,66V OK

i dont know what else, next on the target is IC-202 or IC-203
voltage on supplies of servo amp board on pins of CNJ1 are OK but on +/- 10V pins is :
-14,5V on pin where should be -10V
+13V on pin where should be +10V
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Old 30th April 2013, 06:21 AM   #7
Mooly is offline Mooly  United Kingdom
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Some of the supplies are unregulated which is why the -/+10 volt rails appear high. That's normal.

You have zero on collector of Q202. That means that the fault is to the right of that transistor. Pin 7 of IC202 should also be zero. If it is, and the motor has the four supplies I mentioned earlier correctly applied, then the motor is faulty.
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Old 30th April 2013, 07:11 PM   #8
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hello again,
today measurement on BSL motor board the supplies are OK:
- (-14,12V) on -10V
- (+12,5V) on +10V
- (-11,8V) on -12V
- (+11,9V) on +12V
- BSL RED (pin7 on IC-202) - (-9,4V)

also on pin7 on IC-202 is -9,4V on inpunts opamp (pin 5,6) is voltage OK (0V)
do you think the IC-202 is fault?
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Old 1st May 2013, 01:55 AM   #9
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Pin6 of ic201 should be 0V when player is stopped, and 5.2V when playing.

If pin5 ic202 is 0V, then the output voltage will reduce until the current into R230 matches that coming out of R227.

This immediate cause of the problem does not necessarily incriminate ic201, which may be getting bad input.

Are you sure that spinning is the only thing going on? If the start-up procedure is also attempting to complete, then that pin6 might change as a result of some other fault.

That's why I wonder whether the machine was working before this fault occured. If the laser's dead there's probably no point in continuing, for example. Likewise if it's an abandoned basket-case with multiple defects.
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Old 1st May 2013, 06:41 AM   #10
Mooly is offline Mooly  United Kingdom
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Its a strange result, the numbers not quite making sense. You have to measure pin 6 of IC201 as Plastic mentions above, which should be zero in stop mode. Its pin 6 (of the opamp) reading zero that doesn't ring true given that the output is hard toward the negative rail.
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