Marantz CD94 /Philips CD960 need repair help !

[gasper]

Hallo !

I have aquired this wonderful old CD from relatives and am trying to fix it.

Wld need advice where too look

Beside belts and bulbs which seem peanuts this one has a serious problem:

After warm up the relay at the output switches off after clicking a lot and
the audio output ist gone.
Sometimes the disc in the CDM1 continues normal spinning and the time meter
steps normally forward.
Sometimes the disc stops simultaneously when the relay starts to click and
the display shows disk error
message.

Would like to know which errors this wonderful machine develops after time
because I would like
to fix it for personal use in my hifi.

Basic electronic skills and equipment i do have.

Thanks for your help.

 

[Bob]

Hallo !

I have aquired this wonderful old CD from relatives and am trying to
fix it.
Wld need advice where too look

<snip>

Might want to check for fractured solder joints in the power supply on the
larger transistors, or in the case of my Philips CD880, the solder joints on
the pins where the power transformer plugged into the supply board had
fractured, causing an intermittent / fading display or the drive would stop.
Resoldered all the pins, and my CD880 has been running (and sounding) fine
since.

Since it fails when warm, you might also want to get some freeze spray, and
spray the transistors in the power supply section when it fails, to see if
you can determine if one of them is failing. But I would still give the
circuit boards a good visual inspection for bad solder joints, since the
player has gone through a lot of thermal cycling over the years. Don't know
about the CD94/CD960, but my CD880 does run warm, and the heat up - cool
down cycles caused the connections to fail on the power transformer
connectors.

Hope this helps.

Bob.