(Topic ID: 251156)

Party Zone Row 2,3,4 ground short


By patrickvc

34 days ago



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  • 12 posts
  • 2 Pinsiders participating
  • Latest reply 30 days ago by patrickvc
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#1 34 days ago

I was working on a couple things on my PZ and after turning back on now I get this message on my dmd. After I disconnect the harness going to the mpu all the switches in the rows clear on row 2,3 and remove the cabinet switches harness it clears 4. When I activate any other switch when everything is hooked up the entire row shorts. Could the 2803a chip have gone bad? I checked every wire, switch, lamp. I can’t find anything touching

#3 34 days ago

I did and the entire row would activate when I would test. I changed the 2803 chip and got the ground short problems to go away but now I lost any registering on column 7. The ball troughs slings and a couple switches are out

#4 34 days ago

Which lm339 chip controls column 7 on a WPC mpu. I’m not seeing it in my manual

#6 33 days ago

Awesome thanks Pin Guy. I realized after reading a bunch I was wrong about the lm 339. Up the chain should be u14 as a possible culprit

#8 33 days ago

It was a socketed chip to begin with. I can see that u14 has already been changed by someone in the past. I will test just to make sure

#9 33 days ago

I just looked at the socket that had been replaced in the past and the hole for the chip looks questionable. I’ll pull the board tommorow and check points for continuity

#10 33 days ago

I really appreciate your help

#11 30 days ago

I have continuity between chip leg 13 and 206-6

#12 30 days ago

I changed the chip at u14. Everything is now working

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