Zitt
Member
Now that I received the donor captain's chair; I've begun checking out the board set in lue of a vector monitor.
I've hooked up an oscilloscope in X-Y mode to the X & Y outputs on the video cable - in a bench configuration. By Bench config; I have a 120VAC plugged into the transformer at 1&3 and measured the voltages 5, -5, 12, -12 on the PSU connector. All measured in range.
Other than X/Y (J3); no other cables are plugged in.
When the boardset is first powered up ( I removed the sound boards) the CPU board LED flashes once briefly. The Oscope shows a 45 degree line.
Pushing the test button; the led flashes intermittenly several times then goes out w/ no change to oscope.
I've run across a couple of simple troubleshooting tips - are there any more detailed simular to the pinball repair archives?
I've hooked up an oscilloscope in X-Y mode to the X & Y outputs on the video cable - in a bench configuration. By Bench config; I have a 120VAC plugged into the transformer at 1&3 and measured the voltages 5, -5, 12, -12 on the PSU connector. All measured in range.
Other than X/Y (J3); no other cables are plugged in.
When the boardset is first powered up ( I removed the sound boards) the CPU board LED flashes once briefly. The Oscope shows a 45 degree line.
Pushing the test button; the led flashes intermittenly several times then goes out w/ no change to oscope.
I've run across a couple of simple troubleshooting tips - are there any more detailed simular to the pinball repair archives?
