Two Asteroids at the same time

jrich3031

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Hello everybody, I am looking for some guidance and tech knowledge help. I have two Asteroids projects going at the same time. I have recapped both PCB's, rebuilt both AR-1 boards to include the LM 305 regulator and transistor. Both machines have GO5-802 monitors that I have completely recapped and replaced the HV diode and HV adjustment pot @ 905 in both monitors. I also rebuilt the edge connectors and thoroughly cleaned the power supply's and installed new fuses and big blue in both. the cabinets seem solid now, and I have the +5V dead on to the pcb's.
OK, so for machine one: plays fine, accept for spiderwebs of extra lines all over the screen, which ARE NOT as bright as the graphics, but they are still everywhere. It also has extra lines, which ARE as bright as the graphics. when an asteroid explodes, the dots are connected. There are extra bright lines in the letters on all screens. this machine has no sound, until about 10 to 15 seconds of having the machine powered on. then there is only a blairing humm.
Machine 2: has great sound across the board. Graphics are all on the far right side of screen. they reach top to bottom, just compressed to the right side. Chassis transistor closest to rear of monitor frame gets scorching hot. voltage at Y axis on PCB is fluctuating, but the X axis is a continuous 12.64V. The blink flash on P1,P2 pulses in the spot killer LED.

Any help is very appreciated. I am thinking rom re-seat for machine 1 and X axis needs new transistors on machine 2. just my initial guess.
 
If you swap the boards do the problems move with the boards or stay with the cabinets?
 
swapping boards

the problems stay with the boards. I even mixed in an extra asteroids board to see, (the extra board is a dead clock). I may have done permanent damage to the transistor on machine 2. they are cheap though. Pretty positive my problems are PCB related.
 
Adjust brightness/contrast down on monitor (Not all PCBs have the exact same video signal output level). If the "extra lines" are brighter than (or as bright as) lines that SHOULD be there, you may have a PCB problem. First thing to do is try test mode. There should be a switch to enable it (RTM). If the switch has been removed, you can still enable it by jumpering the "TEST" (or "SELFTEST", I forget) test point lug on the PCB to any convienent GND test lug. Selftest will report if there is any EPROM or RAM error(s).
 
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