Classic Mode

Star Tech Journal

Issue: 1989-April - Vol 11 Issue 2

~Bally/Midway Ram-
page Rolling Video
Video Monitor
Capacitor Types
Matt J. Mccullar
Forum Fair Arcade
Arlington, Texas
Bruce Jellison
Automatic Vending & Games
Bangor, Maine
PROBLEM
PROBLEM
Recently I was working on a Rampage whose
picture continually rolled either up or down,
depending on where the vertical hold pot
was set. Adjusting the pot would slow down
the rolling, but not stop it. For some reason
the monitor would not lock onto the picture
and hold it steady.
Regarding James Beck's article on Monitor
Width Size Change in the January issue of
STARnECH JoumaL If the original cap is
replaced with a general replacement type
such as a polyester, it will usually fail in a
short time due to dielectric heating
SOLUTION
The replacement must be an equivelent
polypropylene type designed for high a-c
current and low dissipation factor. I got my
replacements direct from Wells Gardner.
They have a minimum order policy so you
must order several.
SOLUTION
My first thought was a bad vertical hold pot,
but eventually I looked down at the com-
~'puter assembly and noticed that its video
output connector was seated cock-eyed in
its socket. I pushed it back in and the
monitor zoomed in and locked on the picture
perfectly! Apparently the loose socket was
still making contact with the color signals,
but the vertical sync signal on the very end
of the connector no longer reached the pin.
Since this has happened on more than a
couple occasions, anytime I find a monitor
with a rolling picture I check the video cable
from the computer to the monitor.
000
NOTE
Sprague makes a 'type 715P Orange Drop
thatis suitable. I have found few distributors
that stock this series however, so it is
usually a special order. By the way I have
only found the .15 value in former Williams
Moon Patrols.
Rowe Hot Line
Phonos, MBAs
Please make the following correction
in last month's Journal concerning
the Rowe Hot Line. The Hot Line
printed in the Journal is for products
built in Rowe Grand Rapids only and
includes the coin-operated phono-
graph and the bill changers. All other
tech assistance specifically on vend-
ing should be called into Whippany.
Merit Pubtime
Cricket Pwr Supply
Preniier Hot Shots
Ball Launch Eject
Patrick Groom
Harry Liaros Vending
Buffalo, New York
Service Department
Premier Technology
Bensenville, Illinois
PROBLEM
PROBLEM
We have occasionally received calls on our
Merit Pubtime Cricket games where the 1-4
PLAYER and the 15-B lights are out. The
problem has been with the 7 A switcher from
Penn-Ray. The 12v supply is missing.
Ball launch assembly does not eject a ball
with enough velocity.
SOLUTION
This is usually caused by either a cold joint
or not enough solder to one or both leads of
toroid coil Ll. Resoldering this coil corrects
the problem. I also recommend applying RV
silicon cement to keep the coil from vibrating
loose again (and it will).
Toei Monitor
Vertical Deflection
Ronnie Belitz
Lark Amusement
Bristol, Tennessee
SYMPTOM
The problem I had was that the vertical
deflection on a Toei monitor was folded over
so bad that half the screen looked like you
were looking at it in a mirror.
SOLUTION
After much t'shooting, I fmally found the
problem. It was caused by C55 which caused
the vertical sweep to start in the wrong place.
After replacement with an equivalent ca-
pacitor, things were back to normal.
SOLUTION
Set screws in one or both wheel inserts is
loose or not tightened in flat of gear and shaft
assembly.
1. Tum game power off, referring to the
exploded view, remove in this sequence,
items 9, 21, 1, 3 and 5. This will now expose
item 6, wheel insert and item 7, set screw. f"",
2. Loosen the set screw for the wheel insert
Uiat turns freely on its shaft without any
resistance, carefully pry up the wheel insert
off of the gear and shaft assembly, item 11.
3. Observe the flat part of the exposed shaft
and reinsert the wheel insert so that the set
screw hole is aligned with the flat portion of
the shaft. Tighten the set screwwith a 5/64"
allen head right angle wrench. Rotating the
wheel insert now will also rotate the other
wheel insert. Tighten securely both set
screws and replace removed parts in reverse
order.
4. The procedure is now complete, power up
the machine and if any difficulties arise,
please feel free to call the Premier Hotline at
1-800-444-0761.
000

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