(Topic ID: 233192)

Original AFM Strobe Repair

By GLSP3022

5 years ago



Topic Stats

  • 10 posts
  • 4 Pinsiders participating
  • Latest reply 5 years ago by GLSP3022
  • Topic is favorited by 3 Pinsiders

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#1 5 years ago

I've brought a friends AFM back from the dead. Everything is now working but the strobe.
I've done the research online and on old Pinside topics and it seems to point to the poorly designed driver board. Putting 140v thru a 100v cap seems pretty dumb.
It seems there are several fixes.

My quesrions: 1) Are there any driver board rebuilt kits still available out there?

2) if not, what is the "best way" to repair this board?

Thanks!

#4 5 years ago

I wonder why someone couldn't build a board using today's high powered LEDs as a strobe. Low voltage and intense light.

#8 5 years ago
Quoted from pintechev:

Someone can. Just need to do it.
FWIW - that’s how the remake was done.

Interesting. Pretty sure Metallica does this too?

#9 5 years ago

After finally getting a chance to pull the strobe driver, I saw the small transformer/starter (in red) had completely fallen off the board. So I crafted new leads for it and resoldered.
I also removed caps C1 and C2 for replacement (yellow arrows). It looked like the end of C1 exploded. I'm going to replace them with 100uF 250v polarized caps but use a 1N4004 diode on the backside as suggested by an old pinside post from yonkiman

I'll start with this and see what happens.

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#10 5 years ago

I wanted to bring closure to this thread incase someone ran across it.
The strobe has been repaired and is working well. I replaced C1 and C2 with 250v 100uF polar capacitors. HOWEVER, you must also add 1N4004 diodes across the cap leads on the reverse side of the board. Banded side of diode to the negative lead of the cap.
Failure to add the diodes will cause the caps to pop.
As mentioned earlier, I also had to reattach the trigger transformer after it completely separated from the board.

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