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Sony CDX-A20 10-disc changer *DEAD*

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nacho-nacho man!

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May 31, 1996, 3:00:00 AM5/31/96
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I have been working on trying to get my changer to work but I'm stuck. The
changer itself now seems to be dead - I had accidently gotten the ribbon cables
in the path of the CD shuttle and a couple got broken.

So, I ripped a ribbon cable out of a dot matrix printer, cut it to size, stripped
the leads (that was fun), and replaced the damaged ribbon cable. Now when I
turn the unit on, the display lights up but is blank for about 5 seconds or so,
then goes to the "normal operation" mode - but nothing actually happens. The
backlit panel comes on on the remote commander and everything, but it doesn't appear
as if the circuitry in the changer is getting any juice (the two CD-indicator LEDs
are dark).

I unplugged one of the ribbon cables that I replaced and I get E-99 blinking, and
when I plug it back in, it goes away. So that cable is probably good. However,
the second cable instigates NO CHANGE in the dead behavior of the unit whether its
inserted or unplugged. Naturally, I am of the opinion that there's something
wrong with the cable or the terminators.

Can ANYONE provide me with any kind of schematics, test voltages, or waveforms I
can look for? I have test equipment but no schematics. I'm really getting sick of
looking at this thing and am ALMOST (but not quite) ready to fork out some dough to
a SONY dealer to fix it.


thanks


eric

Sam Goldwasser

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Jun 1, 1996, 3:00:00 AM6/1/96
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Have you actually confirmed that your 'new' ribbon cables are making proper
contact - with an ohmmeter? Assuming that the thing worked better before
the cables were cut, then there are only two possibilities: your replacements
aren't quite right or something was damaged by the 'event' or through later
actions.

I know, not much help but at least eliminate the obvious.

--- sam

nacho-nacho man!

unread,
Jun 3, 1996, 3:00:00 AM6/3/96
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> Have you actually confirmed that your 'new' ribbon cables are making proper
> contact - with an ohmmeter?

I checked to make sure there was continuity through the ribbon cables
themselves, but didn't do this same check with the cables plugged into their
receptacles on the circuit boards. The reason I didn't do this is because
in order to get at one of the cable receptacles, you have to disassemble the
whole chassis of the CD changer to get at the underside of the board - not
a fun thing to go through, but it's appearing that it may be a necessary
step.

eric

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