Help with F115 F116 J112 Opto 12v Problem on Who Dunnit

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I'm gettin the "check uses F115, F116, and opto 12V supply" error on
start-up with my Who Dunnit game. At first I figured it could be the
molex connectors, so I wigged nearly all the ones on the board. No
change. I then removed both fuse F115 and F116 and tested for
continuity - they're fine. I checked the various voltages test points:

TP1 - .5V not 12V
TP2 - 5V
TP3 - 12V
TP4 - .4V
TP6 - 70V not 50V
TP7 - 21V
TP8 - 16V not 18V

Also, the LED 7 is off.

>From looking at the WPC Power Driver Board schematic, it seems that
this would indicate a failure of the BR5 bridge rectifier. There is
also a 15,000 micro farad capacitor (C30) in the circuit.

What bothers me (aside from not being able to play my game) is that TP6
and TP8 are also out of spec. Could this indicate some larger problem
beyond simply the bridge rectifier?

Are there any other tests I should perform to isolate the problem?
Thanks in advance!

Fred

 

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Archived from groups: rec.games.pinball (More info?)

fred.collins@gmail.com wrote:

> TP1 - .5V not 12V
> Also, the LED 7 is off.
>
> From looking at the WPC Power Driver Board schematic, it seems that
> this would indicate a failure of the BR5 bridge rectifier.

I'm working on the exact same problem today on an IJ. Make sure that
you've got 9.8 VAC coming in at J112 to feed BR5. I didn't.

- Josh A.

 

[Guest]

Archived from groups: rec.games.pinball (More info?)

If you search previous posts you will see Who Dunnit is famous for
eating BR 5. This seems to be the only game that has this problem. When
you replace it be sure and add a heat sink to it. This cured the
problem for me.

Mike