Bottom panel fuses on System 1

The bottom panel fuses cover backbox GI (6.3 V AC), playfield GI, the CPU lamps (DC), the 25 V DC coil supply and the 69 V AC display feed. More fuses sit under the playfield, usually for the pop bumpers and big coils such as drop target banks. The coil and lamp supplies use 5 amp slow-blow fuses (page 33) and the GI a 10 amp normal-blow (page 34).

The bottom panel carries 120 volt line power; unplug the game before touching the transformers, line filter or fuse block.

Systems

• Gottlieb System 1

Related tips

• What is on the System 1 bottom panel
• Bottom panel fuse keeps blowing
• Testing a bottom panel bridge rectifier
• The two System 1 transformers
• Spare diodes, capacitors and other parts for System 1
• Replacement bridge rectifiers
• Coil, CPU lamp and GI supplies
• Power supply bring-up, step 1: inputs

Source: Gottlieb System 1 Pinball Repair from 1977 to 1980, Clay Harrell (pinrepair.com)