"Tom Miller" wrote in message
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"Arfa Daily" wrote in message
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wrote in message
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I don't know specifically, but will check my service manuals on CD for
this one.
Any particular problem you are addressing? I may also have service
bullitens.

Dan


It has no 'proper' output. A bit of hum-y noise and that's it. Display is
normal. Appears to tune normally, but I'm sure it isn't. Looks like a PSU
problem or maybe a rail getting dragged down somewhere by a leaky rail
decoupling cap as used to be common on all sorts of Pan gear back in the
day. I picked one of the IF processor chips at random and looked up the
data sheet on it to find the Vcc pin. The sheet claimed a Vcc of 14
volts, but there's actually only about 5 volts on the pin. I tried
following the print back, but it rapidly starts jumping around the board
on wire links and print 'splits'. It's really not worth spending the time
on trying to trace where the rail comes from, and what decouplers are
hanging across it, but it would of course be a very simple fix with the
benefit of a schematic. If all else fails, I can get a download copy for
$4.99 of the 'net, but cheapskate as I am ... d;-)

Arfa
Have you checked the power supply bulk capacitors for a high esr cap? Sure
sounds like it could be an issue.


First check, always. Nothing jumping out. Main rail off the reccy is there
and looks about as ripple-free as you would expect pre the regulators ...

Arfa