Hello,

Just picked up a High Speed.

This is one of two immediate issues.

Background info:

CPU board has acid damage only at the battery terminals.
Score display driver board has one burnt trace, and not in the machine ATM.
All score displays unplugged.
All playfield lights, switches and solenoids are OK, All tilt/slam switches OK. Flipper driver OK.

When I initially power the game on, I get a "0" on the CPU board, I hear a "boop" sound, GI comes on. Nothing afterwards.

If I turn the game off, using the power switch, then immediately turn it back on, the playfield light sequence works, rotating light, credits, etc. I can start a game and everything (except display and AUX sound (separate thread for AUX sound) works. I can play a full game, complete with multiball.

I'm guessing this has to do with one of two things:

1. Capacitor somewhere is defective
2. CPU battery area needs to be cleaned and new battery/NVRAM installed

Any hints? Please see the AUX sound thread if you can help there as well.

Thanks!!!!

Tim

Thanks for the reply barakandl.

I won't have the ability to test either power supply for a couple of days, but I do agree that the issue might be in the PSU. The issue may have caused an issue with the display driver board as well. Not sure if I should get a few caps on order from DigiKey.

Previous owner cut the capacitors on the flipper switches for some reason...

I am waiting to replace the fuses properly with the exact specified ones before I play with the machine further, to see if there is a power problem. I don't need further damage!

FWIW the flippers and pop bumpers all seem a little weak, not sure if that is related. Game is very playable however.

I'll study the schematics in the meantime. I'll replace the CMOS battery on the CPU board this weekend as well.

Tim

Thank You metallik,

I will be replacing the CPU battery bank this weekend.

I found the bad trace on my display board, so far, only one, adjacent to Molex connector J3, Pin 9 (left most pin). It connects R25 with pin 9 on U9 (UDN7180A) This explains the seller telling me one of the displays went bad. Not to bring this thread off in a tangent though!

Cheers,

Tim

I'm going over to K's in NH (near where I live) and having the board put on the bench.

If we can get the sound to come back, I'll have them put NVRAM on it or I'll order a kit and solder it.

Thanks,

Tim