OK. Well that basically tells us that the problem is not the protector, or
probably its feed either, so it will be necessary to start checking the
output voltages of IC502, which is where it gets complicated, because as
it
only stays on a second or two, before dropping back to standby, you don't
have long to evaluate what is appearing on the chip's outputs. As it is
also
possible that the input voltages never have time to reach their normal
running level, it takes a degree of experience to determine if output pins
that are reading low in that second or two, are *heading* for the right
level ...
For an e-mail direct to me, use
Arfa
Ok. What do you recommend as my next step? Should I try and measure the
voltages on all 14 pins and post the results?
You should have the schematic that covers this part of the machine now, and
all of the voltages are printed at the pins of IC502. However, as I said,
it's probably going to be difficult for you to interpret what you're seeing
in the brief time it remains out of standby, but you can give it a try, and
I'll see if anything leaps out at me.
Arfa