Star Tech Journal

Issue: 1990-April - Vol 12 Issue 2

Repair Techniques On Videotape
These secrets have allowed one man to be the sole repairman for over 4,000
video games and pinball machines. For video games and pinballs. Save money!
Repair your own games on location! These videotapes are designed to teach the
person with little or no knowledge of electronics how to make a good repair and
fix some of the more common problems likely to be found in a game which has
stopped working. These are not courses in electronics, but explain how to rec-
ognize easy to repair problems and how to make a professional looking high
reliability repair.
• Video game monitor repairs and adjustments (:31) $29.95
• Video game repairs (:36) $29.95
• Pinball repairs (:44) $29.95
• How to use a volt-meter (1 :51) $29.95
• How to use an oscilloscope (1 :07) $29.95
• How to use a logic probe and logic pulser (:53) $29.95
• How to solder like a pro (1 :30) $29.95
with lots of timesaving circuit board repair techniques.
FAILURE MODES
These tapes show all of the different ways electronic components fail. They also
showthebestwaytofindeachtypeoffailure,andthebestcureforeachproblem.
Gain 30 years of experience under your belt fast!
• All About resistors (1 :00) $29.95
• All About capacitors (1 :28) $29.95
• All About inductors pt. 1 (includes inductors, transformers, flybacks,
pinball coils, solenoids) $29.95
• All About inductors pt. II (includes magnetic clutches, relays of all types)
(:58) $29.95
• All About diodes (includes rectifiers, SC R's, triacs, LED's) (:55) $29.95
• All About transistors (:56) $29.95
• How to Read schematics pt. I (covers monitors, how to find monitor
problems with wiring diagrams, gives symptoms, where to look,
covers both Raster Scan and XV monitors) (:56) $29.95
• How to troubleshoot digital lntergrated Circuits (includes micro proces
-sors, what goes wrong and how to find it, how to use the best literature
on IC's and where to get it) (1 :45) $29.95
OUR NEWEST TAPES
• How to select and hire the best electronic technician $29.95
• Electrical contacts, connectors, connections and problems-symptoms
and good cures $29.95
REMOVE IC's FASTER!
• Salvages 100's of good IC's per hour
• Won, damage IC's or circuit boards
• Removes 6 - 40 pin IC's
• Complete set of 8 desoldering tools
• Order Now! $89.85
Send payment with order or add $2.00 for COD
VIDEO REPAIR SCHOOL
PO Box 813S, Selmer, TN 38375
(601) 287-1594
Original PCB & Header
Breakthru (H) - $95
Champion Baseball (V) - $45
Choplifter (H) - $95
Commando (V) - $95
Double Dragon (H) - $295
Double Dragon II (H) - $395
Double Dribble (H) - $95
Empire City (H) - $145
Eswat (H) - $695
Express Raiders (H) - $95
Gauntlet (H) - $75
Golden Axe (H) - $695
Kick and Run (H) - $95
Kung Fu Master (H) - $95
Last Mission (V) - $95
Main Event (H) - $195
Moon Patrol (H) - $75
Rampage (H) - $145
Shootout (H) - $95
Sidearms (H) - $95
Time Soldier (H) - $145
Track and Field (H) - $95
Victory Road (V) - $75
WWF (H) - $895
Xenophobe (H)- $145
New Redemption
Klondike Single Pusher - New
Skeeballs·- New
A
Alpha-Omega Amusements
6 Sutton Place
Edison, NJ 08817
201/287-4990
We are looking for route people. Great op for
advancement. Full bene's. Call Frank "The Crank".
Call for prices on any game
Nintendo Dual Cabinet Interference Cure
James Beck
Greater Southern Distributing
Atlanta, Georgia
A common complaint heard from dual-cabinet
converters ...
PROBLEM
I am trying to convert a Nintendo dual cabi-
net (sit down) to two JAMMA wired games,
one is Eswat, the other UN Squadron. The
problem is interference between, I think, the
two monitors.
I have used shielding between the monitors
(metal), separate power supplies, and sepa-
rate isolation transformers. I have also tried
getting a little more distance between the
monitors.
ing onto these signals, but the difference
causes a magnetic "beating" of frequencies
in the fields.
This beating is the ripple you see. The verti-
cal sync is most noticeable because it is at a
low enough frequency our eyes can perceive
it. In the original game this was no problem
because the two sides of the board set used
the same master oscillator. The only solu-
If I pull one monitor out about 6 more inches,
the problem stops ...
The yokes are about 5 inches apart. If I pull
one monitor out about 6 more inches the
problem stops, this is great but it makes it
very difficult to close the cabinet! Any help
would be greatly appreciated.
SOLUTION
The problem you're experiencing was cov-
ered here and in STAR*TECH Joumalin the
past year (by me), but I'll recover the quick
version here.
The problem is caused by the magnetic flux
of the yokes being so close together. The sync
signals that produced by two different
boards (even of the same type) are a little dif-
ferent. The monitors have no problem lock-
tion I can give you is to ust as much shield-
ing as possible between the two yokes.
In the cocktail games you must make sheet
metal cones to fit over the yoke assemblies
and silicon them in place. In the uprights
you can get away with a sheet between the
monitors.
Make sure you ground the shields to earth
ground and the chassis.
NOTE
Eswat is a System 16 Sega pinout PCB but
in the Sega USA kit they have included a
Sega to JAMMA interface board and a
JAMMA harness.

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