Star Tech Journal

Issue: 1988-April - Vol 10 Issue 2

7
e
Interniark Competition Basketball Display
Mohamed Salem
Service Manager
Bowling & Billiard Supplies
Dallas, Texas
MAIN PROBLEM
Display blanks out.
SOLUTIONS
We had a lot of service and call time on this
particular game. For various reasons: such
as loose connectors, bad power supply, dirty
sensors, etc., this machine needed constant
attention. We got all of these problems fixed
and it's going great now; of course we had to
do some modifications of our own.
a
1

April 1988
POWER SUPPLY UPGRADE
First of all, we switched to an 11 amp power
supply instead of 8 amps. In doing so, we
needed to measure +Svdc on the board,
which is very difficult without removing the
board housing. I recommend to measure it
on the coin door input, it is faster and easier.
By placing (-) lead of the volt meter on the
white wire of the start button, and the (+)
lead on the coin switch's gray wire, we can
measure an accurate board voltage without
removing anything. The necessary adjust-
ments can be made at this time.
DISPLAYS
Now we come to the most troublesome area,
which is the display LEDs. They derive their
voltage from the solenoid control board via a
step-down transformer. Due to constant
pounding, the transformer breaks loose:
causing flaky chassis ground.
RECTIFIER FAILURE
Another problem that pertains to this circuit
is CR-1 's ( 15 volt de bridge rectifier) constant
failure; therefore, we bypassed this whole
circuit (transformer, bridge and filter). By
cutting the gray wire out of J2, pin 6 on the
solenoid control board, and wiring it directly
to the 11 amp power supply's +12vdc termi-
nal, the failure prone parts were eliminated.
Up until this point, we have had no more
blanking-out problems.
Sega Shinobi Kit Switches
Customer Service Dept.
Sega Enterprises
San Jose, California
PROBLEM
Sega has identified a possible problem with
a batch of Shinobi kit pushbutton switches.
.
SYMPTOM
Intermittent operation.
SOLUTION
Although the problem of intermittent con-
tact is not universal in nature, they are
acting in the following manner:
(A) They are implementing a change over to
open-blade pushbutton switches effective
immediately in factory production.
(B) Upon calling and receiving an RMA# from
Sega Customer Service Department, you
may return any defective switches for re-
placement at no charge. This option is avail-
able to distributors only. Operators should
contact their distributors for proper action.
Tai to Operation Wolf Gun Problen1s
Jim Ennis
Fun City Arcade
Ocean City, Maryland
I would like to start this article by saying that
Taito's Operation Woiflooks like an excellent
piece of equipment as far as player appeal
and earnings go. Unfortunately, a game is
only as good as it works.
PROBLEMS
The main problem, that I have encountered
with this game, has been with the gun as-
sembly, and so far, I have more problems
than I do solutions.
The first thing that happened to our game
was that the gun just fell apart! The bolts
under the gun base assembly loosened from
one week of normal play and just fell (to the
floor) apart! I know it's supposed to last
longer than one week!
Next, the self-locking nut (Ml2) came un-
locked and permitted the gun to be spun
around until the wiring was destroyed and
the gun can now be lifted up and out (as per
the "How To Replace The Gun Assembly"
instructions) to be carried home and
mounted by one of our players.
Thirdly, the gears in the gun, that give you
that fabulous recoil action, stripped away to
nothing. They then made a lot of noise but no
action. At the time, the distributors natu-
rally had no replacement parts because the
game was new. (We all know this tired old
story by heart).
Also, after a short period of time, the grenade
or rocket button fails. There are, also, no
replacements for these either.
SOLUTIONS
As far as solutions go, here are some things
that I have tried and can suggest:
1. Locktite on all the bolts and nuts should
be applied before (preventive maintenance)
they fall apart (which they will) and this
should save you some time and trouble.
2. Go down to your local hardware store and
get a standard doorbell button. It will fit
exactly in place and replace the grenade
button (last longer too).
3. As for the stripped gears, you can only -
take that up with your distributor and hope
for a replacement gun.
GOOD NEWS
Now for the good news: It seems that these
problems only exist in the early production
games. The last games we received had the
bolts Locktited, and the gears seemed much
more quiet. I believe that they have short-
ened the stroke on the plunger, so that there
is less movement and less strain on the
motor and gear assembly.
A SUGGESTION
My wish for this month (I get one, don't I?)
would be that the manufacturers do a little
more field testing for quality and durability;
not just earnings. It would, without doubt,
save operators money, make the game more
popular and reduce headaches all around. It A
seems, to me, that this would benefit every- •
one. Including distributors, who look like
they're stuck between a rock and a hard
place in these situations.

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