Philips CD850 MK1 skipping on some CDs

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richtoy
Berichten: 3
Lid geworden op: 27 dec 2017, 20:59

13 mei 2018, 20:41

Hi,

I have a Philips CD850 MK1 that skips and skates on CDs that play fine in other players. Brand or very clean CDs play OK. I changed some "out of value/high esr" axial caps on the main board and that improved the situation slightly but the problem persists, slightly dirty CDs that play fine in all other players skip in the CD850.

Can anyone suggest where else I could look? PSU voltages are all ok.

Thanks!
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bramjacobse
Berichten: 1487
Lid geworden op: 22 aug 2014, 09:02
Locatie: Almere-Haven
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14 mei 2018, 06:55

Hi Richtoy,

very carefully clean the laser lens
Did you replace capicitors 2521 (47uF ) lasersupply.

Afbeelding

Check for bad, cold & cracked solder joints

Gr Bram
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bramjacobse
Berichten: 1487
Lid geworden op: 22 aug 2014, 09:02
Locatie: Almere-Haven
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14 mei 2018, 10:54

Also check the disc-clamper , there could be a dent under the ball-bearing

Possible small dent at red dot.
Afbeelding

Regards Bram
Laatst gewijzigd door bramjacobse op 14 mei 2018, 15:12, 1 keer totaal gewijzigd.
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movieman
Berichten: 12533
Lid geworden op: 17 mar 2008, 22:42
Locatie: Zuid-Limburg

14 mei 2018, 11:38

You could put some new grease under the clamper as well...

The small axial electrolytic capacitors often cause malfunctions in these players. Bad solder joints are most likely to be found in the PSU: voltageregulators, diodes, resistors.
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bramjacobse
Berichten: 1487
Lid geworden op: 22 aug 2014, 09:02
Locatie: Almere-Haven
Contacteer:

27 mei 2018, 09:19

Hello richtoy,

Any luck, did you fix the problem..?

Regards Bram
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