(Topic ID: 190025)

Black Hole - 5v issue on power supply FIXED

By frunch

6 years ago



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  • 4 posts
  • 2 Pinsiders participating
  • Latest reply 6 years ago by gdonovan
  • No one calls this topic a favorite

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#1 6 years ago

I've been doing all the suggested upgrades for the power supply board, ground mods, etc, and I'm finally ready to get the game going. I started by plugging in just the power supply board, and here's what i got:

TP1 (+60vdc, i have 69.5)
TP2 (+42vdc, i have +52)
TP3 is ground (and these measurements were taken using TP3 for reference)
TP4 (0.8vdc where it's supposed to be 5vdc)
TP5 (+8vdc, I'm getting 8.3vdc).

I plugged in J3 and suddenly i got 5vdc at TP4. Plug in J2 (CPU connector) and my +5 is gone again. Could anyone could send me a pic of J3 to the power supply board from their game? I think mine might be slightly off, in that pin 6 (+5vdc) is unoccupied, but pin 7(also +5vdc) has 2 wires going to it...

Thanks!

Edit: i have installed a 15,000 uf cap in place of the tall orange cap in the cabinet, all new bridge rectifiers.

IMAG2999.jpgIMAG2999.jpg

#2 6 years ago

Did you pickup this pin at Allentown?

#3 6 years ago

Nope, got it a couple weeks before Allentown. I found the problem, however! I'm a putz! I put the wrong transistor in at Q3. The one i installed was a pop bumper/driver transistor. Popped in the correct transistor at q3 and i now have my 5v!

#4 6 years ago

Very cool!

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