(Topic ID: 189847)

Sega Baywatch no 32v

By splitskull

6 years ago



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#1 6 years ago

So my Sega Baywatch is blowing F7 fuse on PPBoard. so no 32v. No flashers and no coils.
Replacing the F7 going in diag and run test on cycling coils (or cycling flashers doesn't matter), will blow up the F7 fuse.
Running the cycling flashers test will cycle up some coils for some reason.

With game off I did a quick check on all Q transistors and cpu and they all look ok to me. (Q29 is the one switching the K1 relay in theory)
With game on and grounding the Q29 doesn't seem to get K1 relay to click. But instead blows the F7 fuse. (quite spectacular)
I checked PPBoard components and they all seem fine. No idea how to check the K1 relay, but everything else was ok.
Looked under the playfield for shorted wires going to any flashers and coils and did not find anything strange.
Don't have any hacked wires/connectors on boards, nothing toasted, or weird looking.

The game was working and I was the last one I played on it before buying it. The only thing I did back home is to remove all fuses and install the correct ones. Like I do in all the games. I had a mixed bag of wtf fuses. Like a 15A, 20A and one that was a simple wire soldered across the fuse ends...

Any idea on where to look next? To at least narrow it, if is something on boards (which one PPB or CPU) or is something under the playfield?

#2 6 years ago

check for a top side flasher twisted up. like one mounted on the metal ramps. I had one on a ramp blowing fuses. Took a minute to find....

#3 6 years ago
Quoted from barakandl:

check for a top side flasher twisted up. like one mounted on the metal ramps. I had one on a ramp blowing fuses. Took a minute to find....

checked all 5 top flashers. Nothing exposed wires touching ramps.

#4 6 years ago

To be more specific, running the cycling flashers test will cycle up 50V coils for some reason.

#5 6 years ago

Just in case someone has the same issue. One of the top playfield flashers was the issue. The screw that keeps the socket in place, cut into the orange wire and was grounding it to the ramp. Orange wire is POWER. (not like I thought, ground).

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