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Power Drift - monitor/board help please!

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shrunkenmaster:


--- Quote from: baritonomarchetto on February 18, 2014, 10:53:10 am ---Try googling for your board and see if other working PCB's have actually your empy connectors connected.
You can also see what the connectors "names" are and check the manual for reference  ;)
Have you ever seen your board working?

--- End quote ---

Thanks my good man, I've cleared up the connectors now. The cab was in this state when I acquired it.

Over on UKVAC, it was suggested I check pin 18 on the 68000's to see if the board is resetting. I picked up a logic probe today and on the CMOS setting - Pin 18 shows:

1) Synchronized flashing LO (Green) and PULSE (Yellow), with pulsing HI (Red)

2) Steady LO (Green)

3) Steady LO (Green)

I've visually inspected both boards and they look good - no visible broken traces, badly seated chips.

Any ideas of what to do next? Any help much appreciated, as I'm new to the diagnostic side of things.



Sky25es:

Push the test switch (open the coin door. There must be a volumen control and 2 switches. It's the second) and verify if the test menu is displayed.

Where does the "crackling" sound come from ? The monitor, PCB Assy or from the PSU ?

shrunkenmaster:

The crackling is just in the speakers. I already tried the test buttons, nothing.

I've just got a logic probe and checked the 68000's - the board is stuck in a reset loop, so I'll be sending it to a chap who specialises in Sega boards.

mgb:

Are you sending it to Ken Westerfield at irepairsega?

shrunkenmaster:

It's going to Mark at http://retroclinic.com here in the UK.

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