A. Cleaning
Asteroids
1.
Leaf Switch Replacement
The exterior of the game cabinet and the metal
and acrylic surfaces may be cleaned with any non
abrasive household cleaner. If desired, special coin
machine cleaners that leave no residue can be ob
tained from your distributor.
Do not
dry-wipe any of
the acrylic panels, because any dust can scratch the
surface and result in fogging the plastic.
B. Fuse Replacement
This game contains six fuses— all on the power
supply assembly (not including the TV monitor
fuses). Replace fuses only with the same type as
listed in Figure 18 of this manual. See the
Quadrascan TV monitor manual, TM-146, for the
monitor fuse data.
C. Opening the Control
Panel
Prior to repairing or replacing any switch on the
control panel or prior to removing the TV monitor,
unplug the game. Then open the coin door.
Reach through the opening and remove both sets
of wing nuts, split lock washers, and flat washers,
located on the underside of the control panel (see
Figure 8). The two carriage bolts will remain in the
control panel.
Lift up on the control panel and tilt it towards you.
Be sure that the acrylic TV monitor shield does not
fall on you.
The top edge of the control panel acts as
a retainer strip for the shield: once the control panel
is opened, the shield is free and could slide out
under its own power.
All five of these leaf switches operate on 5 volts at
a very low current. Therefore, pitting of these
switches would be extremely rare. Probably the only
reason that pitting would occur is in very high-
humidity locations.
Don’t burnish the switches.
Burnishing them
removes their plating, thus increasing the corrosion
of the contacts.
The best method of cleaning the
switch contacts is to wipe them with a non-abrasive
surface.
A business card works very well.
To replace any switch, remove both of its screws
with a Phillips-head screwdriver— see Figure 8.
If the white button itself needs to be replaced,
turn the stamped nut with a wrench in a
counterclockwise direction, as seen from the inside
of the control panel. The white ring on the outside of
the control panel should not spin, due to its design.
2. LED Switch Replacement
The light-emitting diode (LED) switches on the
control panel have a very low failure rate. In case a
switch should ever be suspect, first test it per the
description that follows. To replace the switch, refer
to Figure 8.
1.
Remove the wires from the suspected switch.
2. Set multimeter to ohms scale. Set ohms scale
to R x 1, then zero the meter.
3. Connect multimeter leads to appropriate LED
switch contacts (see Figure 8 for designation of
switch contacts and meter lead placement).
4. Check contacts (push and release the switch
button) for closed and open continuity.
5.
If the contacts do not operate sharply or always
remain closed or open, then replace the LED
switch as outlined in the figure.
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