General illumination and flashers work but none of the CPU-controlled inserts light.

All controlled lamps out, GI fine: blown lamp supply fuse by the big filter cap

Cause: The 8 A slow-blow fuse in the backbox above the large filter capacitor (blue and white wires) had blown; it feeds all the controlled lamps.

Checks

• Test that fuse out of circuit; it is easy to miss.
• Check its fuse clips grip properly.
• If the new fuse blows again, test the bridge rectifier and the large filter capacitor in that circuit.

Fix

• Replace the fuse. If it keeps blowing, replace the faulty bridge rectifier or filter capacitor.

Systems

• Data East CPU Version 3

Games

• Tales from the Crypt

Related tips

• Every CPU-controlled lamp is out
• Bulb spares: #44 for CPU lamps, #47 for general illumination
• Dot matrix shows lines or lights solid, and no CPU lamps work
• How the CPU-controlled lamp matrix is wired
• Which DMD brands are hit by a blown lamp fuse
• A group of general illumination lamps is out
• General illumination dead or dim
• One controlled lamp never lights, bulb is good

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