Arkanoid pcb coin up

PSU14

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Ok, I have reached the point where I'm getting frustrated and its time to ask for help. I bought a non-bootleg arkanoid pcb a while back, put it in storage, now I'm finally getting around to setting it up. Put the wiring harness in the cab, powered it up and game runs well enough to tease me, but won't coin up.

I removed the wiring from the coin mech, and crossed "coin switch" wire (parts side 8) with ground wire (parts side 1) with no coin up. Took the multimeter to those two wires, and got 4.86V. At the board's power harness (H), I got 4.88V and 12.10V. The wiring harness does not have wires at the edge 11 (service switch and tilt switch). I read through the following threads without any luck:

http://forums.arcade-museum.com/showthread.php?t=287750
http://forums.arcade-museum.com/showthread.php?t=150975

So, I have continuity between part side edge 8 and pin 17 on the red PC030CM. I redid the solder for the PC030CM. None of the legs appear to broken.

Any thoughts on what to do next? Am I overlooking anything obvious? Thanks in advance
 
4.88v is a bit low, is that what you're at one of the ICs on the main board? Wondering if you need to adjust up your power supply.
 
Just tested at IC4 next to the PC030, even lower at 4.61V. Time to tinker some more, fingers crossed. Thank you
 
What's your power supply putting out at the power pins connector? Might be that some component is grounding enough to drop the voltage but not so much to make it reset.

I hope its just your power supply is just not delivering enough juice, cause that's much easier to fix.
 
Power supply adjusted. 5.08V and 12.08V coming into the board. 5.04V at the coin switch wire/ground wire. 4.79V at IC4 and edge connector ground. Still no luck with the coin up
 
I'm still a noob at this but it does seem like some component may be dragging the voltage down. I imagine you checked for any broken traces or bent pins? Any of the ICs on the board warm/hot to the touch? Might need to have one of the more knowledgeable folks chime in.

You could also try adjusting up the voltage on the power supply to get that voltage at IC4 at 5.0v.
 
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