Re: Flash Gordon problems rectifier board?

On Jan 28, 9:13 pm, Pinballed <probass...@xxxxxxxxxxxx> wrote:
Ok, 600 ohm resistor...(R1) is measuring low, around 527 ohms. That
goes to  +43VDC. Which now measures a bit higher around 44.7VDC.  R2
is supposed to be 25ohms but it's measuring 27 ohms.That goes to the
Sw IL and according to my schematics should measure 6.5 VDC and is
currently measuring at 7.7 VDC. Also, the CR5,6,7,and 8 do whatever
they do and I'm supposed to get 11.9VDC reading on test point 3 but I
get more like 15VDC. The AC at test point 4 reads 6.7VAC so thats well
within proper limits so that's supposed to mean my transformer is
good. The 600 ohm ceramic resistor gets pretty freaking hot and looks
to have slightly toasted the board... I mean ever so slightly, but you
can see a difference in hue. Not worried the board's shot...it isnt
but that resistor probably is. My question is...can something as
simple as that resistor (600ohm at R2) running low and those diodes
and poss the bridge rectifiers all in conjunction there, screw with my
solenoid driver board, frying my C23 caps WAYYY to quickly and
therefore my mpu gets to 2 flashes and then says...FU to me?
Because thats what I HOPE it is for petes sake!  Sheesh. I was going
over the boards and such over and over again until FINALLY...just
yesterday the damn thing got to all 7 flashes and booted up ready to
go. Lasting for about 20 minutes...which gives me enough time to 'go
over' the other boards and do some tests and see that everything seems
to be functioning properly. Only to die out and go BACK to only giving
me 2 flashes (which makes the game useless to make sure all my other
boards are happenning...and all the test points are giving me either
proper or slightly higher than normal readings) and then I'm back to
square one scratching my head and screaming into my pillow at night.

Any help would be very appreciated

Stan

Sounds more like a problem with a socketed IC on the MPU board. I
would remove the chips and use either contact cleaner or alcohol put
on a q-tip to go over the sockets, blow them out with compressed air.
Then sand the legs of the IC's with 400 to 600 grit sand paper, being
very carefull due to the fragile nature of those.

Tim

Tim
.

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