Sony CDP-101 spindle motor - Page 2 - diyAudio
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Old 1st May 2013, 05:10 PM   #11
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No, it doesn't add up. If pin5 of ic202 is 0V then it seems to me that pin6 becomes a virtual ground. The 540uA of current arriving from R227 must all pass through R230, because any passing through R229 would result in a non-zero voltage at the inverting input. But then the output would be -30V. So I assume there are actually voltages at the inputs, but perhaps below the range used for the measurement. Or AC perhaps.

All that may turn out to be OK, eventually. For the moment, if pin6 ic202 is connected to ground, that should defeat the signal from pin6 ic201, and stop the motor. Then attention should shift to the inputs to ic201

If the machine is oblivious to its motor problem, it should try to complete its start-up procedure if a disk is present. Once it fails to complete because it can't read, it should eject after a few seconds.

The manual suggests a preliminary check for focus operation and laser output, by blocking the light to the disk-detecting phototransistor at start-up. It would be reassuring if that test were done before trying to unravel the ic201 problem.

Also, if anyone can find that list of service points I mentioned, it may be that failure of ic201 was a common fault. I've looked and looked because I want it myself...
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Old 2nd May 2013, 06:27 PM   #12
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I really like this heavy machine,but sometimes I miss the RESET button :-)
I have once again measured the voltage on disconnected connector CNJ36 from BSL board,the voltage is the same so the BSL board is OK. There is one pin called BSL, this is output from pin7 opamp of IC-202 (as you written) this voltage I thing is regulator for the right speed and rotation of spindle motor. I have measured -9,44V, regullar voltage should be not over 5V (I only think) and thats the reason the motor spins too fast and maybe wrong direction.
On inputs of these opamp pin5 and 6 of IC-202 is the voltage OK. when I take a look on schematic there is only R227,R229,R230 and C210 it could be wrong or IC-202 at all.
But there is wrong voltage on pin6 of IC-201 (5,4V instead of 0V), this pin is an output from "LOGIC" inside of IC-201.
On IC-101 the signal DISC STOP (pin31) is OK 4,15V and signal Brake (pin19) is OK 0.66V.
I do not know how goes the start-up procedure, may be is the process fault and the procedure do not goes to the end and it stucks somwhere in "circle"
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Old 2nd May 2013, 07:13 PM   #13
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And you have changed IC201 I think.

It can help with faults like this to go around every pin (and I mean every one ) on the IC with a scope and make sure that whatever is expected really is there.

Worth checking around Q201. With 0.6 volts on the base the AC signal to pin 8 of IC201 should be removed.
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Old 2nd May 2013, 07:36 PM   #14
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Yes you are right, and most important is experiences and skills with elektronics. those I do not have, scope I do not have also. I just tought, it is frequently fault as STK 6922 and it can be easy recovered.
voltage on base of Q201 (0,66V) is correct as in schematic shown
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Old 3rd May 2013, 07:44 AM   #15
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Difficult without a scope. You can try shorting Q201 C to E to see if any change. Are all the other DC voltages correct on IC 201 ?
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Old 4th May 2013, 07:59 PM   #16
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today shorted C and E of Q201, motor spins without any change. all other DC voltages on IC-201 are OK
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Old 5th May 2013, 03:36 AM   #17
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I've just noticed you have no RFCK/4. What do you have on ic503 pins 27, 14, 15, 16?

It looks like ic503 and ic504 have their labels mixed up in my manual.
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Old 5th May 2013, 07:05 AM   #18
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Quote:
Originally Posted by PlasticIsGood View Post
I've just noticed you have no RFCK/4. What do you have on ic503 pins 27, 14, 15, 16?

It looks like ic503 and ic504 have their labels mixed up in my manual.
Well spotted re RFCK.
It really needs a scope to go around the IC.
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Old 5th May 2013, 07:36 AM   #19
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I want to say very very thank you for your patience and good will to help me to solve the problem on distance.
I have measured today the IC-503 with multimeter on 20V DC range with these results:
- pin 27 (RFCK/4) - 0,03V
- pin 14 - 0,6V
- pin 15 - 1,99V
- pin 16 - 1,78V
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Old 5th May 2013, 08:54 AM   #20
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I have got a frequency meter purchased from China and I have measured also frequency on pin16 of IC-503 and its OK - 8,641MHh so the X-502 should be OK
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