(Topic ID: 280201)

atari pinball voltages

By dobo

1 year ago



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  • 3 posts
  • 2 Pinsiders participating
  • Latest reply 1 year ago by dobo
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#1 1 year ago

I'm having trouble getting the right voltages at the display and credit. I get my -90V but I'm only getting +47V. I disconnect J19(credit) and get the same readings testing the display. Then I disconnect J17(display) and then get -90V and +61V. With that the credit display will work and is bright. But then I need to disconnect both and measure at the PCB. Where are test point on that board? How do I test the PCB voltages. I just got the board back from getting fixed and I'm just not sure. I know I'm losing Voltage with the display because if I disconnect the display I can get the credit to work. I'm just not sure how to test the PCB. Can someone help me? I need to check the outputs on the PCB. And then after that how do I trouble shoot the PCB or the display?

#2 1 year ago
Quoted from dobo:

I'm having trouble getting the right voltages at the display and credit. I get my -90V but I'm only getting +47V. I disconnect J19(credit) and get the same readings testing the display. Then I disconnect J17(display) and then get -90V and +61V. With that the credit display will work and is bright. But then I need to disconnect both and measure at the PCB. Where are test point on that board? How do I test the PCB voltages. I just got the board back from getting fixed and I'm just not sure. I know I'm losing Voltage with the display because if I disconnect the display I can get the credit to work. I'm just not sure how to test the PCB. Can someone help me? I need to check the outputs on the PCB. And then after that how do I trouble shoot the PCB or the display?

I'd check the square molex connector that connects to the light board/displays. Ohm out each wire to where it goes to the connector at the bottom of the PCB.

#3 1 year ago

How do I check 90v through out the whole machine? Aux board, transformer, and such.

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