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(Topic ID: 258094)

Doctor Who F111 blows on power-up


By RocketFromTombs

10 months ago



Topic Stats

  • 7 posts
  • 3 Pinsiders participating
  • Latest reply 9 months ago by dsuperbee
  • No one calls this topic a favorite

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#1 10 months ago

Hey there everyone,
I have a Doctor Who that has been sitting for a few years that I want to get back into playing condition. I powered it up tonight, and F111 is blowing immediately upon power up. I pulled the power supply board and replaced BR4, put it back in the game, and the same thing happens. Any ideas?
Thanks,
Brian

#2 10 months ago

Unplug connectors involving F111. See if you have a board issue or a problem out in the game.

Was BR4 bad ?

LTG : )

#3 10 months ago

Could have a bad flasher, socket, or a short to flasher wiring.

LTG : )

#4 10 months ago

Okay, with no connectors plugged in to the board except for J102 (power), it's still blowing. I hadn't checked the original bridge when I changed it, just assumed it was bad, but I just used my DMM and it appears to be okay. I guess I have a short somewhere on the power supply board? (I didn't see anything obvious...)

#5 10 months ago
Quoted from RocketFromTombs:

I guess I have a short somewhere on the power supply board?

Yes.

Quoted from RocketFromTombs:

(I didn't see anything obvious...)

Shorted components can be invisible.

New BR4 good ? Then using your meter as best you can, go over the 20 volt section.

How's this ? 7812 -12V regulator ?

LTG : )

1 week later
#6 9 months ago

Alright, it took a while due to a busy holiday week, but I got it all fixed.
There was a trace from one of the AC inputs on BR4 that was shorted to ground (looked like a solder splash). Took a bit of searching to find it, but I got it. I replaced the 15,000 microfarad capacitors while I had the board out, they were original and a couple looked like they were starting to bulge. Put the board in the game, and it's alive! WOOHOO! I still have some issues with the mini playfield that I need to address (namely no motion CW or CCW) and a couple of opto switches that aren't registering, but aside from that, everything works, and I was actually able to play a game - it's been about 5 or 6 years since I got to do that!
Thanks so much for your help, I really appreciate it.
-Brian

#7 9 months ago
Quoted from RocketFromTombs:

Alright, it took a while due to a busy holiday week, but I got it all fixed.
There was a trace from one of the AC inputs on BR4 that was shorted to ground (looked like a solder splash). Took a bit of searching to find it, but I got it. I replaced the 15,000 microfarad capacitors while I had the board out, they were original and a couple looked like they were starting to bulge. Put the board in the game, and it's alive! WOOHOO! I still have some issues with the mini playfield that I need to address (namely no motion CW or CCW) and a couple of opto switches that aren't registering, but aside from that, everything works, and I was actually able to play a game - it's been about 5 or 6 years since I got to do that!
Thanks so much for your help, I really appreciate it.
-Brian

On the bi directional board under the pf that controls the mini pf is a cap. I am willing to bet it puked its guts out and took out some traces and possibly the chip on the board.

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