Holding the flipper button up for a few seconds blows the flipper fuse. Earlier the same flipper chattered (machine-gunned) when held.

Flipper blows its fuse when held up: end-of-stroke switch not opening

Cause: The end-of-stroke (EOS) switch is not opening when the flipper reaches the top, so the coil stays on full power until the fuse blows. A burnt or failing EOS switch can also cause chattering; an open hold winding is the other common cause of chatter.

Checks

• Hold the flipper up and watch the EOS switch: it must open at full stroke. Arcing there shows a bad switch.
• Check the coil's hold winding and diode with a meter.

Fix

• Replace the EOS switch and gap it so it opens cleanly at the end of the stroke.

Systems

• Stern MPU-100

Games

• Magic

Source: Pinball Repair help group!! (Facebook group)