One pin of the 12-pin transformer input connector on the power supply board has burnt (a common failure on the GI pins), and an identical board-side header is hard to find.
Burnt GI pin on the Data East power supply header: move it to a spare pin
Cause: Heat from a poor connection on a high-current GI pin.
Checks
- Look at the back of the board: the centre pins of this header are not used, and a spare pin there can take the place of the burnt one.
- Check the solder joints of the whole header for cracks.
Fix
- Jumper the burnt pin's pad to an unused pin on the header, move the matching wire in the plug to that position, and mark the plug so it cannot be fitted wrongly.
- Replace the plug's burnt terminals, and reflow the header joints.
This connector carries transformer AC; unplug the game before working on it.
Systems
Related tips
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Source: Pinball Repair help group!! (Facebook group)