(Topic ID: 219245)

Data East 5047-00 Rev C - High Voltage Values too high?

By crazi

5 years ago



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    #1 5 years ago

    Hi

    I'm checking a PSU board for a friend (long distance) so I don't have a proper DE game to check it in. His is a TMNT and I have a LAH. So I can connect voltage inputs (CN1 & CN2) and do output checks only. So:

    1) I have fixed the 5v issues and now reading 4.98v
    2) 12v +&- circuit is fine giving +13.65 and -13.60v

    The High Output section has been previously tampered with. Checked all components and they measure fine. Resoldered a few suspicious dry joints. Output voltages are a bit strange though.

    CN5

    Pin 1 Ground - Tick
    Pin 2 -98VDC (I get -114.6v) Suspicious
    Pin 3 -110VDC (I get -127.5v) Suspicious
    Pin 4 +68VDC (I get 70v) Tick
    Pin 5 +12 VDC (I get +12v) Tick
    Pin 6 +5 VDC (I got +4.98v) Tick
    Pin 7 key - Tick

    My input voltage on CN1-9 is 117vac

    So all is fine except a suspicious Pin 2 & 3. They are both about 17v too high.

    As mentioned tests are being done with no load connected (no displays connected or other PCB's).

    So my question is:

    1) Are these too high and would possibly damage the display boards when attached? If so what is the probable cause?
    or
    2) Are these two voltages within range and will work fine?

    Thanks
    Crazi

    #3 5 years ago

    The DMD schematic shows high voltage in as -120v. If that's the case my unloaded -125v to -127v from the PSU may be fine. And it shows the other high voltage as -108v where mine is -114v so again should be in tolerance. I think this board is now fine but would love for anyone whose got a Hook or TMNT etc who could do a quick voltage reading on your PSU High voltages?

    #5 5 years ago

    Yes it's a 1N5379B and seems to be testing fine on the DMM. Weird...

    #6 5 years ago

    Just for info. I modified the #00 in to my LAH #02 (CN7 is different) and turned on. Everything working 100% in attract mode. So the higher voltages are fine as they are in line with the DMD tolerance input voltages.

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