(Topic ID: 312044)

Bram Stoker's Dracula Fuse F104 Keeps blowing

By s000m

1 year ago

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  • 8 posts
  • 6 Pinsiders participating
  • Latest reply 1 year ago by s000m
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#1 1 year ago

Hi all,

I have recently done a cabinet restoration and as a result completely dissasembled the cabinet and back box to restore and re-decal the machine.

The issue I have is upon start up the machine blows F104.

If I unplug J107 the fuse does not blow. This is responsible for Solenoids 9 - 16. I have checked in the backbox and under the playfield but everytime I think I've found the problem (bare exposed wire, diode leg exposed, loose wire). The issue persists.

Initially I thought it was a LED mod I had in the slingshot star posts where a wire had come loose this didn't resolve the issue though.

I had it working for a while thinking I had resolved it but after lowering the backbox to install the side rails the issue came back. When troubleshooting this issue should I just be tracing the wires (Purple/Green, Purple/Orange, Purple/Yellow and Red/White). Or should I be looking everywhere.

I'm wondering if the wires being too taught did something...

As stated initially if the solenoids aren't connected (J107 removed) the fuse doesn't blow.

I'm running low on 3a Slo-Blows so I've purchased a resetable fuse and I'm just waiting on it to arrive to do some more troubleshooting.

Any tips on isolating this issue and resolving it would be greatly appreciated.

For context I have rottendog Driver board and CPU boards.

Any other information you think that would help, please ask.

Kind Regards,


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#2 1 year ago

Additionally. I ran through the solenoids looking at the resistance of each one and they all seem to fall within their expected values.

#3 1 year ago

I could be way off here but I seem to recall there was an issue with some RD boards if they were over tightened they grounded/ touched metal in certain areas in the backbox?

#4 1 year ago

GJM - I think the issue you are remembering is for system 6/7 - a hold down screw was touching something it should not have, and there was also some instances where the back of the board hit the ground plane. For the ground plane issue a piece of fish paper or some other insulator between the board and ground plane took care of the problem.

However, in the OP's case, it may not be a bad idea to pull the boards and look for arc marks on the ground plane.

#5 1 year ago

Seems like a short in the playfield solenoid circuit, maybe something touching ground. I’d check vio/orange circuit and look for short, desoldering portions of it to isolate problem.

Make sure coils are rotated the correct way… in some places if they are wrong the lugs can touch ground.

#6 1 year ago

Been a minute since I worked on BSD. I'd be tempted to solder one wire off all solenoids 9 through 16, leave J107 plugged in and see if it blows. If not, slowly add one solenoid at a time and power the game up until the fuse blows. Then, you'll have an idea as to which solenoid is the problem.

#7 1 year ago

Power off, J107 removed, test each pin on J107 for continuity to cabinet ground. The one that buzzes is going to be your problem child. Follow that wire.

#8 1 year ago

Hi all resolved it!

So the solenoid left slingshot coil was to blame for the short.

It may have been orientation or the coil itself. As I replaced the coil AND changed its orientation to reduce risk of shorting.

Thanks all for the replies and advice.

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