3
STAR•TECH JOURNAL/MAY 1982
FIEID SERVICE
TIPS
WILLIAMS "HYPERBALL" NOTES
WILLIAMS PCB
INTERCHANGEABILITY
NOTE: The board revision is on
the trace side on the bottom near the edge
connectors inside a box. On the com-
ponent side it is on the bottom, furthest
from the connectors. [Q]
This circuit is very similar to the
type used on "Missile Command" and is
very reliable.
ATARI "CENTIPEDE"
BOARD REVISIONS
BY DAVID "ROCK" BOG REES
JCS COIN MACHINES
DAYTON,OH
Williams "Hyperball" Service Notes
The ball shooter circuit on Williams'
"Hyperball" has a fuse change. On earlier
games a 15-amp fuse was used. This was
changed to a 4-amp slow blow fuse. On
the sticker inside the light box it still
indicates a 15-amp replacement. This
should be changed to eliminate confusion.
The auger motor jams with the
slightest amount oflint from the playfield.
If your auger motor has a metal fan
instead of a plastic one, then you need the
kit from Williams - Part No. K-509-2.
Williams Video Board
Interchangeability
Contrary to popular belief, "Defender"
and "Stargate" CPU/Video Boards are
not interchangeable. However, "Stargate"
and "Robotron" CPU/Video Boards are
the same and can be switched with no
problems.
Atari's "Centipede" Board Revisions
Some problems may occur with the track
ball even after new -02 steering boards
have been installed and resistors R83-86
and RI 30-13 3 have been changed to
6.8k. This can be checked in test mode by
spinning the ball hard to the left. The
moving image will move backwards and
then "lock up" with eight images flickering
even after the ball has stopped moving.
This problem is caused by revision "A-
F" which has no capacitors in the input to
LC. LS157. "G" revision boards have
capacitors and resistors arranged so that
the object displayed in any mode will be in
the direction in which the ball is traveling.
This requires a lot of work and should be
done only on a game in the shop in case
any problems arise with cutting traces,
etc.
*
NEW INPUT
PROTECTION
CIRCUIT FOR
WELLS-GARDNER
COLORX-Y
DISPIAY
This display contains an additional small
printed-circuit board (PCB). The PCB is
mounted in "piggy-back" style on top of
the Deflection PCB.
The input protection board was
added to protect the fuses in the display
from damaging input voltage conditions.
Without this board, the display fuses
might blow in the event of an intermittent
or long-term game PCB failure. With this
board, the screen will momentarily go
blank if the average X- or Y-axis voltage( s)
exceed a certain level. The screen then
automatically recovers for normal game
play and earning when the voltage( s)
return to normal.
If this display is used in Atari
"Tempest" games, be sure to correctly
adjust the X and Y SIZE and CTR video
pots on the "Tempest" Analog Vector-
Generator (main) PCB. The instructions
for these adjustments are printed on the
"Tempest" schematics - Sheet 2, Side B
- 3rd printing or later. Improper adjust-
ment may cause the screen to go blank
during normal game play.
*
STERN
"TURTLES"
UPDATE KIT
Stem has released an update kit for their
video game, "Turtles". The kit is a 9-chip
program change enhancing the game play.
The new program makes it easier for the
player to score, adds color, and improves
overall game appeal. Also the video images
are changed. The beetles are now race
cars which adds considerably to the
excitement of the game.
The "Turtle" update kits are avail-
able, at no charge, from your Stem
distributor (with return of original roms).
Order Kit #RBI.
*
NEWPORT
JOYSTICK
REPLACEMENT
SOLUTION
Newport Joysticks mod. 125
(black color)
Subject:
Intermittent contact on leafswitches on
early 1982 shipments. Small particles of
the white Delrin(plastic) contactor, which
moves the contacts, is being rubbed off by
the edge of the leaf contact. This plastic
dust settles between the contacts.
Solution:
Call or write: Newport Machine Design,
P.O. Box 418, Bishop, CA 93514, 714-
873-4431. They will send you a whole
new shaft assembly from the New Joystick
mod. 125A (golden color) with a perma-
nently attached large knob, heavier rear
bushing, larger spring and shallower
contactor. This will solve the problem.
STAR*TECH JOURNALNOLUME 4, NUMBER 3/MAY 1982/COPYRIGHT 1982 BY STAR*TECH JOURNAL, INC. STAR*TECH JOURNAL IS PUBLISHED 12 TIMES A
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