Star Tech Journal

Issue: 1992-June - Vol 14 Issue 4

June 1992
STAR*TECH Jouma/
GTIVIDEO
~EW SOFTWARE
MARs BILL
WHITE-OUT
ACCEPTORS
CONDITION
Service Department
Drew's Inc.
Spartanburg, South Carolina
Don Powell
Don's Video Repair
Shelbyville, Tennessee
SEMINAR PROGRAM
ADDITION
REPAIRING VIDEO CARD GAMES
& 8 LINE MACHINES
Date: June 20th, 1992
Place: Shelbyville, TN
NEW SOFTWARE
SYMPI'OM
"K" software available for the
VFM 5-S Stackerless Bill Accep-
tor.
GTI games with no reset or
screen is raster only (white-out).
ANTI-STRINGING/ALARM
Low or missing 12Vac.
Instructor: Don Powell
SOLUTION
Comments from previous
attendees:
Time: 9:30 am - 5:00 pm
Tuition: $195 ($225 walk-up)
CAUSE
This will shut off the bill acceptor
for 15 minutes, if someone tries to
string a bill. Also signals an ex-
ternal alarm system. For further
information about the alarm, call
your distributor.
~,
Replace the 12Vac transformer.
Or, do away with the Ac on the
board altogether.
MODIFICATION
Stacker kits are finally available.
These will convert VFM 5-S bill
acceptors into a stacker unit.
This will greatly help with secu-
rity!
Install ajumper from pin 2 ofU51
to right side ofR21. Then remove
R21.
200 Bill Stacker Kit
400 Bill Stacker Kit
600 Bill Stacker Kit
1,000 Bill Stacker Kit
LAW
Contact your distributor for pric-
ing and availablity.
MURPHY'S
"The program was very infor-
mative. I learned quite a bit in
only one day." TN
"Excellent seminar and in-
structor. Recommended." IL
"I enjoyed the course, it taught
me alot. The instructor gave
many valuable tips." TN
#1404
"I'd rate the instructor and the
course very good overall." PA
The one who least
wants to play
is the one
who will win.
"I soaked up alot of informa-
tion, money well spent." TN
• • • Fotrtl6re irtt~nnatio11 call·· •
· 609/662-108()/ • •
> .• · ot'fax . .
>609/662--0537
A
DVERTIS
N
0/NJ 'flC4/M 0/NJ@/J!)§'fl/JfWa
609/662-1080
OR FAX
609/662-0537
G
.
?
To receive an information
package, send registration
and tuition payment to: S*TJ,
PO Box 1065, Merchantville,
NJ 08109. Make checks pay-
able to ST AR*TECH Journal.
June 1992
STAR*TECH Joumal
TROUBLESHOOTING MONITORS WITH
AN AUDIO GENERATOR
(PART 1)
Gary A. Hughes
General Coin Distributors
Portland, Oregon
The coin machine industry seems to create its own
seasons and times. Which means that some of us are
just getting around to Spring cleaning, and others
are putting the final touches on their Fall house-
keeping, and some are just getting around to the one
scheduled for February of '89.
SUBJECT
SELECTION
Part of the problem is that big pile of monitors in the
corner that aren't fixed but may be repairable.
Until we know for sure they will continue to take up
space and cost us time & money.
A usable generator should put out both sine anr
square waves, the sine being the one most used-
here. It should have a variable output from the
millivolts up to about 10-12 Vpp. A frequency range
ofl0 Hz to l00kHz is adequate, most will go higher.
My shop uses a Leader LAG-120B, which does a
good job. For your monitor bench, great sensitivity
and incredible bandwidth are not needed. If that
saves you any money it's good to know.
T'SHOOTING VERSATILITY
One of the most useful tools for your video bench is
an audio function generator, also known as a sine
and square wave generator .
Coupling this tool with
your trusty 'scope you can:
• Check electrolytics in
circuit
0
• Check flybacks in or
out of circuit
• Check entire horizontal
circuit in seconds
• Check diodes and
transistor junctions
• Decide whether to repair
or junk chassis before
you tie up precious hours!
• •

II D
Figure 1 Connections
~~~@)~
0
• • • • • •


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