Play Meter

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San Diego learns
Gottlieb's system
San Diego operators and technicians
learned about Gottlieb's "System 80"
pingames at a one -day seminar held
on April29 . The class was sponsored
by Betson Pacific and was held at the
King's Inn.
Gottlieb's Field Service Engineer
George Offshack thoroughly de -
scribed the new pinball system ,
despit e the lack of a sample game for
demonstration purposes . Schematics
and troubleshooting guides were
distributed to all who attended . A
buffet lunch was also provided .
Bally, Midway set
electronics class
Bally Pinball Division and Midway
Manufacturing will sponsor an elec-
tronic flipper and video school on
August 11 - 15 at the Howard
Johnson 's International O'Hare in
Schiller Park , Illinois . Class size will
be limited and will be filled on a first
come , first served basis.
For further details or to place
reservations, call 800/ 323-3555 in
the continental United States ; in
Illinois . call 312-825-6431.
SERVICE TIP:
Tailgunner 2
The two nine pin plugs to the audio
P.C. board look the same. One plug
has + 5 , + 25 , -25 volts , while the
other has 5 volts only .
You should mark these plugs
before removing them from the P . C.
board so they can be easily differ-
entiated . This will avoid the extensive
damage that would result from
getting these interchanged .
- Wayne Conner. Betson Pacific
Jim Smith of Sega Centers sees Instructor Fromm show how the digital
multimeter is used in amusement games repair.
Arcade school a success
San Diego Arcade School held its
first session on "Practical Solid-State
Amusement Repair" the week of
June 9th , 1980 . Nine students
attended the class , which ran
through Saturday , eight hours a day .
"The class was quite successful ,"
said Rand y Fromm , PLAY METER
technical editor who instructs the
school. "I am grateful for the extra -
ordinary cooperation extended to the
school by the coin amusement
industry ," he added. "With only a
single exception , every manufacturer
th at I contacted for materials and
information was extremely he lpful. "
During the class , students learned
about basic electro nic theory , diodes
and transistors, power supplies ,
I
Figure 1
I
video gam e monitors , e lectronic
pinball, and more . Cinemetronics
sponsored a special presentation on
service techniques and the theory of
operation of their Vectorbeam moni-
tor games . a Rip Off game was used
as a demonstration unit .
The use of a closed-circuit tele-
vision camera with a close-up lens
brought service techniques and other
valuable information to the monitors
on each student's be nch , with the
student able to see , up close, th e
critical service test point that are
necessary in servicing electronic
games .
A fall and winter schedu le is
planned for the San Diego Arcade
School .
•
Coin switch sensing
J Figure 2
Double Coin Slot
NC • Normally closed
NO • Normally open
CORRECTION
An ite m in the Technical Topics
section of PLAY METER , June 15,
1980 included an incorrect part
number for GE varistor MOV-11. The
article concerned retrofitting some of
th e older model RMC phonographs
("Varistor installation how-to ," page
76) . The correct General Electric part
number is V56ZA8 . The correct part
number does occur on the RMC
drawing, kit 11 52551. PLAY METER
apologizes for any confusion caused
by the June typographical error .
C ·Common
Si ngle Coin Slot
Some video game manufacturers use a single coin sense input to the logic
system from a double coin slot door .
Figure 1 shows the different coin switch configurations. As you can
see, in the double switch arrangement , the switches are not wired
identically .
This can be confusing when troubleshooting games utilizing this set-up
[Exidy Star Fire , Vectorbeam Warriors , C inematronics Tail Gunner] .
Figure 2 illustrates a typical single sense input to the game electronics.
- courtesy , Star-Tech Jo urnal, Merchantville , New Jersey