Star Tech Journal

Issue: 1990-August - Vol 12 Issue 6

National Technical Seminar Outline
SI'AR,it'TECH Journal's well received national technical seminar program offers advancing
technicians a way to increase their level of expertise. Hundreds of industry techs have
received valuable training across the country. The student critiques are overwhelmingly
favourable (over 93% rate the seminar excellent overall). While the program is constantly
updated to stay current with industry technical trends, the following outline is in effect.
STAR*TECH JOURNAL SEMINAR PROGRAM
1: RuNoowN ON MINIMUM REQUIRED TEST EQUIPMENT
FOR COIN-OP REPAIRS.
a. What it takes to get the job done.
2:
TROUBLESHOOTING VIA PHONE.
a: Getting good information.
b: Question checklist.
3:
POWER SUPPLIES.
a: Linear
1: Low Voltage
2: High Voltage
3: Common failures
b: Switch Mode Supplies
1: Single Voltage Supply
2: Multivoltage Supply
3: Common Failures
c: Useful Tips
d: Semi-Conductor replacements
4: MONITORS (CONCENTRATING ON THE NEW W-G K7000
& liANTAREX MC9000 ).
a: B+ regulation and failures
b: Horizontal Output Section
c: Vertical Output Section
d: RGB Amplification and Blanking
e: CRT Operation and Rejuvenation
f: Common Failures
g: Useful Tips
5:
Lome
a: Input Circuitry
1: Switch
2: Opto
3: Analog
GAME PCB
b: Video Output Circuits
1: Look Up Table RGB
2: D-ARGB
c: CPU Systems (Concentrating on 68000, Z80,
6502)
1: Basic CPU requirements
2: Differences between CPUs
3: Troubleshooting Trashed Kernals
4: Useful Tips
d: Cross reference list for common RAMs and
other Logic Devices
6: BUILDING AND
USING
CPU NO-OP ADAPTERS.
7: BUILD YouR OwN MONITOR PATTERN GENERATOR.
a: How to add color inversion and patterns
8 : IIANDs
ON LAB
a: Switch Mode PIS Operation
b: Monitor Operation
c: Logic Operation
Cautions, Precautions & Observations
Piggy Back PCBs, CPU Sockets, WG Med Res, Surface Mount Caution,
CRT Blaster, Wms Test Rom, Cabinet Alert
James Beck
Greater Southern Distributing
Atlanta, Georgia
CABINET ALERT
SURFACE MOUNT CAUTION
Watch out! Some HS-9 cabinets have been
miswired so the "earth" ground going to the
monitor is connected to neutral and neutral is
connected to ground. That isn't too much of a
problem as long as the outlet is wired OK other-
wise YOU could get knocked for a loop. The main
symptom that you can visibly see is a definite
"Hum Bar" in the video due to the hot returning
via ground.
Surface mount I C's should NOT be screwed with
by anyone but a qualified tech that has access to
the PROPER rework tools.
WMs Tm RoM
This new "Williams Test ROM" being sold by a
second source for close to $100 is NO better than
having a known good set of F-14 ROMs laying
around.
CRT BLASTER
Heath Kit sells a good CRT rejuvinator for close
to $100 that does everything the $450 B&K
Precision does and all you have to do is solder it
together. It will payforitselfthefirst time you use
it.
WG
MEDIUM RESOLUTION
Wells-Gardner K7000 monitors that have been
adapted to "Medium Res" (i.e. 24 KHz) blow
horizontal drive transformers right and left.
CPU
SOCKETS
Manufacturers should socket their CPU's so it is
easier to plug your ICE system into the suckers
without having to either destroy or thermally
stress the CPU.
PIGGY BACK PCB
Manufacturers who stick their ROM boards on
top of the CPU board with connectors that make
it impossible to troubleshoot the CPU board
without special extenders should be subjected to
a close-range thermo-nuclear blast.

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