Star Tech Journal

S*TJ
APRIL1981
4
\Vlllams General lllunination Mod
by Todd Erickson
Note:
The game will be slightly
dimmer. (Here is a helpful hint
to use while shopping pins.
Install the new bulbs in the
playtield and place the used
ones in the head where they
are more accessible.) •
Many of the Williams pinballs have been burning out the general
illumination lamps prematurely. The #44 bulbs are rated at 3,000 hours
at 6.3 volts. Even a small over voltage will cut the life sharply. To
lengthen bulb life, it is necessary to lower the voltage. This is done by
the following change, using a lO0V 35 amp bridge rectifier screwed to
the sheet metal in the head for a heat sink.
1 MOUNT BRIDGE
RECTIFIER
FUSE CARD
+
AC
-
__,
J2) DISCONNECT FROM
~ ~ BOTTOM OF 20A
FUSE CLIP AND
SOLDER TO BRIDGE
3
SOLDER WIRE FROM
BRIDGE TO BOTTOM OF
20A FUSE CLIP
6TI·17
6BR3
6FI
20A
1-----<1
6.3 VAC
' - - - - - 6.3 VAC RETURN
6Tl·19
Midway
"RalltX'' Monitor
Fuse Ratilg
To prevent intermittent fuse
blowing, change the 117V line and
monitor fuses located at the bottom
of the cabinet to two amp slow
blow.
*********
Midway "Pac-Man"
Cocktail Table
Static PCB
SUBJECT: Static PC., T.V. Picture
Fails to Flip.
(two player game)
1. When installing a static unit in a
cocktail table check position
"R" on static unit for proper
ground jumper.
2. The logic board must be
lowered before installing static
unit.
FROM
TRANSFORMER
YELLOW
YELLOW
v,--
Unsolder the yellow wire from
the bottom of the 20A fuse clip
and solder to the bridge
positive (+) and negative (-)
terminals.
Solder the yellow wire
attached to the bridge AC
terminals to the bottom of the
20A fuse clip.
• •
• •
• •
• •
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