(Topic ID: 302229)

Black knight - connector 2J9 blows F2 fuse

By martymart

2 years ago


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  • 15 posts
  • 6 Pinsiders participating
  • Latest reply 2 years ago by frunch
  • Topic is favorited by 3 Pinsiders

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#1 2 years ago

I have been working through a number of issues on a Black knight. The latest issue I have encountered is the F2 fuse blowing once a game starts and connector 2J9 is connected. When this connector is disconnected the fuse does not blow and I can play a full game

Looking at the manual it looks to control mainly magnet relays, coin door lock out and bell.

I am not sure where to start looking with this, any advice on where to start on this one is greatly appreciated.

#4 2 years ago
Quoted from Schwaggs:

Remove J2-9
With the game off, measure the resistance to the coil side lug of the F2 fuse holder on the power board for each of the pins in the J2-9 connector. This is an easy way to measure the resistance of the wiring and the various coils. If you find one that is less than 5 ohms, you know where to start looking for either a bad coil, bad diode, or shorted wiring.
Pin 1 Q35 - Special Relay
Pin 2 Q37 - Nothing
Pin 3 Q39 - Nothing
Pin 4 Q41 - Nothing
Pin 5 Q43 - Bell
Pin 6 Q45 - Coin Lockout
Pin 7 Q33 - Right Magnet Relay
Pin 8 - Key
Pin 9 Q31 - Left Magnet Relay

Thanks for sharing this process, this looks a much quicker and easier way to diagnose this type of issue.

Found the issue, this one has a issue with the Bell coil.

#6 2 years ago

Thank you everyone for your help so far.

I have now resolved the F2 fuse issue. I found that the bell solenoid was faulty. I replaced it with a new one and now I can play a fully functional game.

However I played around 5 games and then had what looked to be a reset. After that I lost all the displays. I have checked all the fuses and made sure all the cables were seated properly. All of these look ok.

Any ideas on where to look next to fix this next problem.

Thanks in advance.

#9 2 years ago

Replaced the header pins on the CPU board and at this stage everything looks to be holding up ok for the moment. It looked like a heap of cold and cracked solder joints.

Hopefully can now close this one out.

Thank you everyone for your help.

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