Star Tech Journal

S•TJ DECEMBER 1981 14
Operators!
Mechanics!
Are you searching for a
painless way to upgrade
your ability to repair the
Electronic games you
operate ... the games you
depend on for your
livelihood?
Randy Fromm's Arcade
Schools offers 46 hours
of comprehensive, practi-
cal training in electronic
amusement repair for
mechanics and operators.
You don't need an
oscilloscope ... to be
successful at repairing
Solid-State games. The
course stresses the
efficient use of test
equipment like the Logic
Probe
and
Digital
Multimeter; relatively in-
expensive equipment that
operators and mechanics
can easily afford .
Is the course expensive?
Not really. The tuition fee
of $400.00 includes over
$7 5.00 worth of textbooks,
databooks, and other
materials.
Randy Fromm's Arcade
School will not teach you
how to repair a jukebox,
electromechanical pinball
or vending machine. You
will learn about diodes,
transistors, power supplies,
electronic pinball, video
games (including a special
session on video games
that use the X-Y monitor
system), cross referencing
semiconductor replace-
ment parts, using a logic
probe, and more.
San Diego Arcade School
61 23 El Cajon Blvd.
San Diego, CA 92115
714/286-0172
Dallas Arcade School
11857 Judd Ct.
Dallas, TX 75243
214/231-3307
ROCK-OLA
INTERMITTANT * PROBLEMS* AND* SOLUTIONS
PROBLEM:
A few operators have reported occassional intermittant problems with
Rock-Ola Microcomputer Controlled Phonographs . These problems may
include one or more of the following :
a) Magazine keeps on scanning and never stops.
b) Gripper arm tries to pick up a record in the home position.
c) Mechanism keeps on playing the same record over and over.
d) Proper amount of credits are shown on the credit display window but
selection keyboard is inoperative.
CAUSE:
These problems are brought on by strong static discharges causing:
1) Latch up of I.C. 405 (CMOS Hex Buffer CD4050) on Newer Type Logic
Board (R.M.C. Part No. 53560-A).
2) Latch up of LC. 401A (CMOS Hex Inverter CD4069) on Logic Filter
Board No. 2 (R.M.C. Part No. 53555-A).
When either LC. malfunctions, the oscillator waveform will be improper and
the microprocessor will not operate correctly.
SOLUTION:
This problem can be corrected by disconnecting the tan wire from pin 10 of
Socket S401 at the Mechanism Logic Connector or at the Logic Filter Board
as the case may be. This lead acts as a pick-up antenna for the static inter-
ference and the troubles do not occur when it is disconnected.
NOTE:
This change should be incorporated only on those machines where newer types
of Credit and Pop Meter boards OR Credit and Pop Meter filter boards are
being used. These boards have new self-contained oscillator circuits and do not
require the oscillator signal from the Mechanism Logic Boards.
GOTTLIEB
SYSTEM 80 * PROM * LIST
SOUND PROM
GAME
SPIDERMAN
GAME PROM
653/1
653/2
PANTHERA
652/1X
652/2X
652
CIRCUS
654/1
654/2
654
COUNTERFORCE
656/1
656/2
656
STAR RACE
657/1
657/2
657
JAMES BOND
658 (TIME)
658 X (3 BALL-5 BALL)
658F
TIME LINE
659
659E
FORCE II
661/1
661E
PINK PANTHER
664/1
664E
MARS
666
666/S1
666/S2
VOLCANO
667/1 B
667A/X (FOREIGN)
667/S1
667/S2
667 (FOREIGN)
653
COURTESY OF GOTTLIEB'S TECHNICAL NEWSLETTER ··o N TARGET"