(Topic ID: 187630)

Driver board A-12697-3

By Benhurr

2 years ago

Topic Stats

  • 21 posts
  • 5 Pinsiders participating
  • Latest reply 2 years ago by Benhurr
  • Topic is favorited by 2 Pinsiders


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There have been 11 images uploaded to this topic. (View topic image gallery).

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transformer schematic 2 (resized).jpg
transformer schematic 1 (resized).jpg
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#1 2 years ago

That my 1st William Demolition Man and got à problem on the driver board...ca you help me...the top right led is not shinning. Does someone know what do I test first

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#2 2 years ago

That's your 20v power supply LED. It lights up when that power supply is working. Take DVM (Digital Volt Meter) connect on led to ground (there is a ground pin on the power driver board) or a mounting screw for the board and connect the other lead to the 20v power supply lug on the power driver board. It is labeled (very small) next to the lug. See what voltage you have. If you don't have 20v or more than that power supply is not working and you will have to possibly look at the rectifier.

#3 2 years ago

Here is the pic of that 20v lug

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#4 2 years ago

Check the fuses first. Could be a blown

#5 2 years ago

Ok thank's a lot i test the power and don't have the 20V...but what did you call the rectification...is that it?

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#6 2 years ago

What did you call the rectifier ?

#7 2 years ago

They are diodes They are used for rectification from AC current to DC current Check your fuses first. Upper right side of the board. Use the DVM.

#8 2 years ago

Already test the fuses..all are ok and i've change 4 big black capacitors and five big grey Diodes but still have the problem..could it came from the parts i take in the pictures that i sent before?

#9 2 years ago

The rectifier for the 20v supply is BR4 and c11 is the corresponding capacitor
as you see here in the schematic Look also for a bad trace in the board burned or broken. Use the continuity tester on your DVM to check the traces.

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#10 2 years ago

Here is another shot of the drawing

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#11 2 years ago

Bridge rectifier: Big metal square thing, there are two on the first picture you posted. Replace the right one.
Capacitor: round black thing, also two of them on the first picture. Replace the top one.

#12 2 years ago

Already done what you say before...thank's you so much for drawing...I Will let you know what it was after check if there's no trace burned on the board.

#13 2 years ago

Yeah Cool you can PM me if you need another pic of the drawing.

#14 2 years ago

Thank's a lot...I found the problem. The BR4 ground trace who was broken...so the Led is shinning but now i've got another mystake.

It send me all balls but I don't test the contact in the launch rail...

But the big one is that any flipper works... what do I have to test first...searching for the flipptronic II board schematics wires diagrams

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#15 2 years ago

Test for voltage at all flipper coil lugs.

#16 2 years ago

So I check voltage on the driver board and i've got only 36volts when it might be 50volts...only 7.2volts comming from the Xformer secondary when it might be 9Vac...9.4Vac when it might be 13Vac and 14Vac normaly 16Vac from Xformer secondary...do not have the schematic of the schematic transformer...could someone send it to me
Thank's for your help

#17 2 years ago

This is from Jan 1995 WPC Schematic book. Does it have what you need and legible?


transformer schematic 1 (resized).jpg

transformer schematic 2 (resized).jpg

#18 2 years ago

Yes that's what I need but the problem is the sad quality that couldn't be possible to read wires colors...but I think I could find it whith a quick search on web pages
As well thank's for your help.

#19 2 years ago

Is this better? I'll zoom in. Let me know

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#20 2 years ago

Just checking...is it pinned for correct voltage? Here's a snippet from the 230v schematic.


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#21 2 years ago

Great, that's really better. i think it is correct pin because the pinball works correctly before.
thank's a lot

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