Mr. Pinball Tip:

One way to test Bally solid state solenoids and their drive transistors is to attach a test clip to ground and then use the other end of the clip to ground the large metal tab of each transistor you wish to test. In some ways this is easier than using the test button on the front door. It makes it easy to retest a specific solenoid, and it helps you verify the correct transistor.

This technique does you no good if the transistor is bad, the solenoid is bad, or the connection to the solenoid is bad.
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