Star Tech Journal

Bally Truck Stop Modifications
Ed Schmidt, Service Department
Bally /Williams
Chicago, Illinois
SUBJECT
Prototype to production game changes.
SYMPTOM
CHANGE
Rom Error: Intermittent game lock-up. This
Capacitor Change Affecting The n.vo Upper
Bally Flipper Assemblies: Remove the exist-
ing disc capacitor (.01 uF, lKV) wired paral-
condition occurs only in the multi-player
mode on proto 1 and 2 memory game roms
02 and 03. This condition exists from game
serial number 180000 to 182700.
SOLUTION
To correct, install new game roms, Proto 3
(12 Dec 88) on the control PC board at
positions 02 and 03.
CHANGE
Fuse Change: The flipper power supply PC
board F2 fuse value has been increased from
4 amp slow blow to 5 amp slow blow. NOTE:
The flipper power supply PC board is located
on the upper right hand comer of the back
box.
CHANGE
Play.field Fuse Value: The playfleld fuse pro-
tecting the slingshot and truck stop (upper
left vertical kicker) coils must be a 2 amp
slow blow. Note: This fuse is located on the
wiring side of the playfleld approximately
two inches to the left the lower left flipper
assembly. The fuse clip wire colors are
brown on one side and red with white trace
on the other side.
lel to the end-of-stroke switch. Install the
Williams capacitor (yellow), 2.2 uF, 250 V,
wired parallel to the end-of-stroke switch.
The Williams capacitor part number is
5045-12098-00. See Figure 1 below for.
proper Williams capacitor installation:
EtJS
sw1n:.1-1
BRACKe---~
2.2.v'I
C.APliCf rr? P.
Figure 1
Williams Capacitor Installation
A. Using a cable tie,
secure the 2.2 uF cap to the
E-0-S (U shaped) switch bracket.
B. Solder 2.2 uF cap wires
to the E-0-S switch as drawn.