Quoted from Vin-bot:I replaced it with a 2.5mdl fuse and when I powered up the machine it was fine, but once I went to the test menu.. the fuse blowed.
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The following is pure speculation on the single statement quoted above.
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This points to the special solenoid (playfield) trigger switches. These are connected at 1J18. Disconnect this connector and try again. If the fuse blows with 1J18 disconnected then you have a board problem in the special solenoid trigger circuits. If the fuse does NOT blow with 1J18 disconnected you have a stuck special solenoid trigger switch.
When you enter test, one (or more) solenoid should lock on (you can hear this) and then with the sustained current the fuse will blow. If you do not hear a solenoid lock on then it is possible that the affected solenoid is shorted (presumably melted) and does not generate a magnetic field.
Quoted from rotordave:Also - could be the photo but looks like you have some acid damage to the board. Look at U44. Hey - that could work fine for years, just keep an eye on it.
Some? I think that looks fairly extensive to me. I shudder to think what it looks like to the left of the image if that is what is visible at U44 and surrounding areas.
Totally unrelated to any quoted text above ... that board came from a Road Kings. It is System 11 (nothing) and compatible with Pinbot but one segment of the diagnostic digit display will blink as the diagnostic LED would ordinarily blink.