Mark said:
The Power pin runs the speaker relay driver. It's not the B+ power for
the micro.
I'm looking at the 525 schematic, so the notation may be a little
different.
Try looking at Q925, your 5.6 volt regulator. Maybe no DC input to it at
all. (cracked circuit board is very common on these - and very hard to
see. You'll need a magnifying glass.)
Mark Z.
Mark, Thanks, I do not get anything at q925. I do not get a relay latch
in the power supply board rly901 that sends 120v ac to the big power
transformer. I believe q922 gets its input v from one of the output
windings from this transformer? A couple of possible clues could be that
if I disconnect the large ribbon cable from the display to the main
board my relays power and I do see 12v out of q925. I did replace q706
on the microprocessor board. I does look like the storage capacitor is
open here also and I have not replaced it. I am assuming that this is
only for memory storage and will only affect memory storage but the unit
still should operate?
Thanks much for your help,
Gary