(Topic ID: 287727)

Bally Viking Pop bumper Solenoid Not Firing

By FatPanda

3 years ago


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  • 13 posts
  • 4 Pinsiders participating
  • Latest reply 3 years ago by Quench
  • No one calls this topic a favorite

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#5 3 years ago
Quoted from FatPanda:

Testing with the machine on, pin 10 grounded, DMM in DCV, J5 unplugged.

R29 top leg 5.17V
Bottom leg .78 V

CR12 non-banded side .796V
Banded side 18.4 mV

Cheers, these readings say you have a short circuit at the Q12 transistor - likely Q12 itself. Specifically between the transistors "Base" leg and the "Emitter" leg. This short is stopping the Q12 transistor from actually switching on.
--- Remove the ground jumper from pin 10 of U3. Now what voltage do you measure at the non-banded side of diode CR12? Should be around 0.3 volts.
--- Can you post the part number on the Q12 transistor, just in case it's the wrong part.
--- Post a picture of the back of the board around Q12 in case our eagle eyes spot an accidental solder short.

#7 3 years ago
Quoted from FatPanda:

The transistor was replaced before me

Did you use a TIP102 transistor or something else?

#13 3 years ago
Quoted from FatPanda:

I replaced the transistor and it works!

Great!

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