(Topic ID: 23863)

Switch matrix trouble fuses 115-114 also..

By justjoe

11 years ago



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  • 3 posts
  • 2 Pinsiders participating
  • Latest reply 11 years ago by justjoe
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    #1 11 years ago

    As some of you know Ive been rebuilding the dr who I just picked up. I finally got all the parts needed and it booted up!
    The problem Im having is the switch matrix. No switches are working at all. Ive checked the driver board, good voltage at all of the tp points. Ive tested the switches, voltage going to them. I jumped the pins on the cpu board and nothing.. Maybe the U20-U14?
    It also boots up then tells me check fuses 114 and 115. The fuses are good....?

    Any ideas before I tear apart the cpu?

    #2 11 years ago

    If you jumped the switch matrix on the CPU board and nothing, you're problem is isolated to that board. I'm sure someone smarter than me can chime in on what chips to replace / test further up the food chain.

    #3 11 years ago

    Just ordered new U20 and U14 chips. Everything is pointing to it, so we will see.

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