(Topic ID: 146073)

Simpsons Data East Solenoid Issue

By brainmegaphone

5 years ago

Topic Stats

  • 6 posts
  • 2 Pinsiders participating
  • Latest reply 5 years ago by brainmegaphone
  • No one calls this topic a favorite


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#1 5 years ago


Working on a game for a friend - the downside is that the game isn't in my possession and therefore I need to make the most out of each time I go over there...

I got the game running and playing - it has a new rottendog MPU. The only remaining problems are that one of the cooling towers pop bumper doesn't fire (switch works and scores but no bounce) and the right drop target doesn't reset.

My plan based on research (looking for recommendations or confirmation)-

Note that I've already confirmed all fuses and fuse holders are correct/stable.

1. I will start by testing the transistors on the new MPU to make sure they aren't shorted. I am hoping this isn't the case since the board is brand new... but such is life.

2. Next would be a power test across the two applicable coils.

3. Next would be to cut diode end and test it.

I'm wondering - if the MPU transistors are shorted should I just replace the coils? With a brand new MPU having a blown transistor can I assume something in the coil likely is bad assuming no other wiring shorts are present?

Should I be doing anything to the PPB for this repair other than reheating solder joints?

Thanks in advance for advice.

#2 5 years ago

First thing to do is ground the trigger wire at the driver to see if it pops or not. If it works, problem is upstream (driver transistor and backwards, board problem) if it doesn't work, problem is downstream (connector, wiring, coil, lack of coil voltage). Note it also won't be a solenoid fuse if no solenoid voltage at just one coil alone - you'd have more coils out than just the one. Generically speaking, for most pinball systems.

#3 5 years ago

When you say "ground the trigger wire at the driver" what exactly do you mean?

#4 5 years ago

Coils all have power constantly applied, the driver transistor acts as a switch to complete the circuit to to fire the coil. First, you will have to identify the coil number for the bumper in question, referring to the manual. For example, the right turbo bumper is indicated as coil number 18 with the control line (CPU to coil) indicated as BLU-ORG CPU CN19-3. This info can also be found on the displays during the the coil test. In this example, I would locate the blue wire with orange stripe attached to CPU connector CN19 pin 3. Using a test jumper wire, momentarily making a ground connection to this pin on the connector should fire the coil. If it fires, the coil is functional and getting power, and all the wiring is good back to CPU connector CN19. Determining if you have an upstream or downstream problem is essential to quickly identifying which part of the circuit contains the fault.

#5 5 years ago

Excellent - thank you for the clarification - I've tracked down the respective transistors to test and will follow your recommendations to isolate the issue!

#6 5 years ago

Note that I meant I've tracked down the coil numbers - I realize your instructions were to ground the coil wire on the CPUboardand not the transistor itself.

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