kiphartzell
New member
I have a PAT9000 that I am trying to get working. I recently acquired this unit and was able to briefly power up a known working Tempest board set for about 10 secs (working video on vector monitor) after which the PAT9000 now seems to constantly activate the power trip circuit. Since then, I haven't been able to get game power to work and according to the manual, all my voltages are faulty since all LEDs are lit when main power is on and game power is off.
My initial investigation found a burnt LM337 on the power trip card which has been subsequently replaced. I also recapped this card.
Even with a new LM337, I still have the voltage LEDs lit with game power off. When I try to apply game power (even with no game board hooked up) the Power Trip relays will not stay energized (will only briefly energize with the momentary toggle of "game power on" ). Looking over the schematics, it leads me to believe that there may still be a problem on the power trip card since that seems to drive the game power relay signal. An alternative may be a problem with the Switch Control PCB which seems to drive the +22v for energizing the coil in the relay.
Any suggestions on things to look at or try? I am not very familiar with the normal operation so I am just going by what the manual states as expected operation. Thanks.
My initial investigation found a burnt LM337 on the power trip card which has been subsequently replaced. I also recapped this card.
Even with a new LM337, I still have the voltage LEDs lit with game power off. When I try to apply game power (even with no game board hooked up) the Power Trip relays will not stay energized (will only briefly energize with the momentary toggle of "game power on" ). Looking over the schematics, it leads me to believe that there may still be a problem on the power trip card since that seems to drive the game power relay signal. An alternative may be a problem with the Switch Control PCB which seems to drive the +22v for energizing the coil in the relay.
Any suggestions on things to look at or try? I am not very familiar with the normal operation so I am just going by what the manual states as expected operation. Thanks.