Sony CDP-557 ESD erratic behaviour - diyAudio
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Old 14th April 2006, 12:57 PM   #1
Lourens is offline Lourens  Europe
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Default Sony CDP-557 ESD erratic behaviour

Dear all,

Seeking for some help solving strange problems with my brothers 557 (in original state).
First symptoms were: play-back stops without any obvious cause, after some rattling (mechanical) noise from the cdp-mechanism, it slows down to stand-still in a few seconds (music had stopped at the moment the noise started). Display reads: DISC*MEMO.
Starting again sometimes results in uninterrupted playback, but mostly in the same error after about 2-3 minutes.
Moving this heavyweight from his place to mine at first seemed to cure things. It even played on ‘repeat’ successfully for 24 hours or so. But after a few days the same problems popped up again.
Sony Netherlands wasn’t willing to accept the machine for repair (too old.....) nor to provide a service manual as an alternative (not available....).

Next step was to bring it to a well known Dutch repair and modification expert. At his place it played for weeks without any problem at all... He had no clue of what could cause those at other places.
Finally a friend in yet another city gave it a try. First weeks: no problems; then - at intervals: the Disc*Memo obstruction. Thorough cleaning and lubrication of all moving parts seemed to help, but after a few weeks another symptom occurred. Playback was ok, but the drawer didn’t open anymore. Pushing the in-out button only stops play back. Until yesterday, now it plays ok again....

Any suggestions to solve the problems are very welcome!

TIA
Lourens
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Old 15th April 2006, 12:49 PM   #2
Lourens is offline Lourens  Europe
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Default please help!

Nobody?

Of course it also would be really helpful to have a service manual!

best regards
Lourens
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Old 15th April 2006, 01:16 PM   #3
Vidalgo is offline Vidalgo  Israel
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Hi,
You can get service manual from here
It's not free, but very cheap.
Hope it will help.
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Old 16th April 2006, 06:50 PM   #4
Lourens is offline Lourens  Europe
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Thanks, Vidalgo!
Ordered it right away.

sjalom
Lourens
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Old 16th April 2006, 08:40 PM   #5
Vidalgo is offline Vidalgo  Israel
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Probably, one of microswitches (there are at least 3, in each CD mechanism) sometimes has lossed contact, it's can be aging problem. Only idea.
Also, good point is to check tray motor driver IC. At least visual inspection of solder joints, and overheating check (just with finger).
Time to check electrolytics?
And check your mail
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Old 16th April 2006, 08:42 PM   #6
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New laser?
I have the manual too.
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Old 16th April 2006, 09:03 PM   #7
Netlist is offline Netlist  Belgium
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Here's a tip:
Check for poor solder joint on pin 30 of IC101.
Just blank resolder it, even if it looks good.

/Hugo
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Old 16th April 2006, 09:59 PM   #8
Vidalgo is offline Vidalgo  Israel
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Quote:
Originally posted by Netlist
Here's a tip:
Check for poor solder joint on pin 30 of IC101.
Just blank resolder it, even if it looks good.
/Hugo
Time bomb?
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Old 17th April 2006, 06:51 PM   #9
Netlist is offline Netlist  Belgium
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At that age, yes. Careful inspection and resoldering of critical components is a must. Voltage regulators, IC's, coils and even normal TO92 transistors are to be redone.

/Hugo
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Old 17th April 2006, 07:23 PM   #10
Lourens is offline Lourens  Europe
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Thanks for all the tips. Will keep you posted!

best regards
Lourens
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