Williams 1979 Service Bulletins
#WMSSB79
13 page collection of Service Bulletins for early solid state
Williams pinball machines on the following topics:
- Driver Board resistor updates
- Master Display Board special repair procedures
- General Illumination fuse card modification
- HOT TIP. LUCKY SEVEN, WORLD CUP, DISCO FEVER playfield switch modifications.
- Level 3 CPU modifications
- Power Transformer labeling corrections
- ROM & PROM Summary chart
10 oz