(Topic ID: 260701)

Bench Testing Data East cpu board problem

By maddog14

4 years ago


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Topic Stats

  • 14 posts
  • 7 Pinsiders participating
  • Latest reply 3 years ago by thedefog
  • No one calls this topic a favorite

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#8 4 years ago
Quoted from Neal_W:

Yes.
IMO - First test would be to remove all chips that are in sockets (ROM/RAM/CPU,etc) and see if the 5v is OK.

Bingo. First order of business is to find out what is dragging your 5VDC down.
Any chip on the MPU board could be the culprit.
Start with the easy techniques as Neal_W mentioned by removing socketed chips.
After that, leave the board powered for a while. Place your finger on each chip. Does one of them seem abnormally hot?
After that, you are left with educated guesses, and removing chips one by one.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#11 4 years ago
Quoted from maddog14:

Does not look too proffesionally done. I bet it will come down to fixing previous work.

That is unfortunately the reality that I confront with almost all boards sent to me these days.
I'll often remove all prior rework, just to establish a known baseline of board function.
--
Chris Hibler - CARGPB #31
http://ChrisHiblerPinball.com/contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

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