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Old 9th December 2015, 10:25 AM   #21
hifiboy is offline hifiboy  Germany
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Default PDT won't work

Hi, my PDT recently developed the following error: when switching on the mains, the motor starts running and will not stop. CD can be loaded but will not be read. Display shows zeros and error is shown. I checked inside and realised that there is the motor control signal MCS is at 5 V constant which explains that the motor is running always at full speed. No PWM of the MCS signal as would be expected. Anyone having observed and repaired this error/misbehaviour before?

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Old 15th December 2015, 09:20 AM   #22
amc184 is offline amc184  New Zealand
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In this type of player I've seen a few things cause this:
  • Blown motor driver
  • Loss of clock to decoder IC
  • Bad decoder IC

If the MSC signal is not valid it's probably one of the second two. Check that the crystal is oscillating.
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Old 6th January 2016, 10:55 AM   #23
hifiboy is offline hifiboy  Germany
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I observed the loss of clock to decoder IC. I changed the SA7220 and the crystal. It starts spinning and reading now.However, music reproduction stops suddenly while playing the CD. I observed that the CD is then spinning very fast. The CD player would not respond to any command stop, play etc. The swab/ssm pin is always high. Switching on/off solves the problem. It starts fine but then stops after some time, the CD spins fast, no response to commands etc. Could it be the decoder IC? Thanks for your help!
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Old 9th January 2016, 10:27 PM   #24
amc184 is offline amc184  New Zealand
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I'd have a look at the buffered clock signal out of the SAA7220 to the SAA7210 during the fault.
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Old 9th January 2016, 11:29 PM   #25
hifiboy is offline hifiboy  Germany
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I did that. I observed a stable clock. I did change also the SAA7210. No change. The fault is still there. I observed that sometimes while in stop position, the CD wiil suddenly start spinning w/o pushing a button. The swab/ssm signal (pin 20 of MAB 8441) jumps from L to H. Any ideas?
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Old 11th January 2016, 11:04 AM   #26
elcid is offline elcid  Italy
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have you checked the micro switch on the tray?
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Old 30th June 2019, 12:01 PM   #27
Toronto is offline Toronto  Canada
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Hi my PCD 3 having similar issues.It would play certain CD's one day then it won't.I can hear a slight clicking noise.When its does play its works perfectly.
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Old 17th July 2019, 12:22 PM   #28
Toronto is offline Toronto  Canada
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Default Read out

On the screen it also reads 99 or 00...it would play a cd one day then it wont.
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Old 18th July 2019, 10:26 AM   #29
QSerraTico_Tico is offline QSerraTico_Tico  Europe
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Replace electrolytics on laser board underside swingarm-laser
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