(Topic ID: 221396)

Pinbot Fuse F2 blows after 3 seconds but not when J11 is disconnected


By Bumper

1 year ago



Topic Stats

  • 4 posts
  • 2 Pinsiders participating
  • Latest reply 1 year ago by wayout440
  • No one calls this topic a favorite

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#1 1 year ago

My Pinbot worked fine, but now when I switch it on fuse F2 (4A SB) on power supply blows after 3 seconds, it does not blow when I disconnect J11 from the CPU board. When J11 is disconnected the visor test works but it does not kick out ball and the ramp stays raised up.
I tested across all coils connecting to J11 and they all measure above 4 ohm.

What is the next step I should take to figure out the cause?

#2 1 year ago
Quoted from Bumper:

My Pinbot worked fine, but now when I switch it on fuse F2 (4A SB) on power supply blows after 3 seconds, it does not blow when I disconnect J11 from the CPU board. When J11 is disconnected the visor test works but it does not kick out ball and the ramp stays raised up.
I tested across all coils connecting to J11 and they all measure above 4 ohm.
What is the next step I should take to figure out the cause?

Most likely a shorted driver transistor since it blows just after power up. Check all of them that run through J11. Q22,23,24,25,30,31,32,33

TIP122/102: Put the black lead of your DMM on the center lead or on the metal tab of the transistor. Put the red lead of your DMM on each of the two outside legs of the transistor. You should get a reading of .4 to .6 volts. Any other value, and the transistor is bad and will need to be replaced.

#3 1 year ago

Thank you sooo much!

It was Q33, I checked all coils under the play field but forgot checking the knocker in the back box.
I replaced the TIP102 transistor and the AE-23-800-02 coil by a SG-23 850-DC coil that I had laying around.

Everything is working now!

#4 1 year ago

Excellent!

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