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Michael Michael is offline
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Posts: 17
Default Sony KV-2781R -- B+ regulator problem

dkuhajda:

Thanks for the reply. You tweaked some memory here -- I just can't isolate
where and when I've seen a bad main filter cap before but it was a good
while
back.

In any event, I checked the cap (560uFd/200V stubby with 90 degree offset
pins) out of cct and it tests good for C and ESR (although I appreciate that
static
testing might not show everything). The cap is connected directly to the
main bridge rectifier. There's no RC filter network; it's just the bridge
rectifier -
filter capacitor - 1.6A fuse - STR3035 regulator. I would have thought the
6 V ripple not all that bad -- the SCC552U-A (SAMS) schematic shows 8.8 V
ripple at the same point.

I don't have anything in stock to sub it with so it will take some time to
try that out. But I wanted to check with you again on this before I order a
replacement. Have you seen these check good yet not be functioning
properly?

Michael




wrote in message
oups.com...

Replace the bad main filter capacitor. 6V ripple is way too much for
that set.