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SECTION 8
MECHANICAL ADJUSTMENTS
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SWITCHES
There are different types of switches used throughout the
game. The switch blades are made of a highly conductive
spring type metal in various lengths, thickness, and form.
Each switch is designed to satisfy specific operation condi-
tions such as bounce, current carrying capacity, speed of
operation, etc. Therefore, it is important to replace a
blade with another of the same kind. When adjusting
blades, never kink or bend sharply, as this causes fatigue
which leads to fractures. Adjust blades with a sweeping,
bowing motion, with a switch adjusting tool or duck bill
pliers.
When switch adjustments are called for, before forming
blades on any machine, check that the screws holding the
switch stacks are down very tight. This is recommended
because plastic spacers in the switch stacks will occa-
sionally shrink by drying out causing a poor adjustment.
With the exception of a few instances, all blade type
switches should have at least 1/32 inch between the con-
tact points and should follow thru for at least 1/32 inch
beyond the point at which the contacts close. This follow
thru action provides a wiping motion between the con-
tacts keeping them clean and insuring good contact be-
tween the points.
To adjust blade type switches properly, first adjust the
actuating blade (usually, the longer one) with relation to
the part that it contacts. Then set the gap and follow thru
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by adjusting the other blade.
SWITCH CONTACTS
With the exception of flipper button and end of stroke
switches, all blade switch contacts are gold-plated and
must NOT be burnished or filed. To clean the contacts,
close them on a clean piece of paper (e.g. business card)
and wipe gently until the contacts are clean.
For the flipper button switches, remove tarnish by filing
with a contact file and then burnishing. Do the same for
the flipper end-of-stroke switch contacts.
DO NOT file or burnish any other contacts.
Severely pitted contacts should be replaced as an assem-
bly. Switch contacts should only be adjusted when they
cause a malfunction or do not score properly.
ROLL-OVER LANE SWITCHES
Playfield lane switches are operated by a roll-over wire
form which is actuated by the ball. Before the switch is
adjusted, the wire should be centered in the playfield slot.
The long blade closest to the playfield should be adjusted
..,
to hold the wire form up. Check this condition with the
playfield down. Then, with the playfield up, adjust the
short blade for 1/16 inch clearance. Depress the wire
form to its maximum depression with the ball and check
for 1/32 inch follow thru. To prevent switch vibration a
back-up blade is used. It should be parallel and just barely
in contact with the short blade.
FLIPPER
Flippers are controlled by the flipper push buttons at each
side of the cabinet. The flipper coil consists of two wind-
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ings: A pull-in winding and a lighter gauge hold-in wind-
ing. The hold-in winding is normally bypassed by a closed
switch.
The pull-in winding produces a strong stroke. However, if
this winding were to remain energized by the player it
would overheat. To reduce this high current, the hold
winding is put in series with the pull-in winding by open-
ing the end-of-stroke switch.
This switch should be adjusted so that the long blade is
moved by the flipper pawl assembly for about the last 1/8
inch of movement.
With the plunger completely
depressed manually, both switches should be adjusted for
a 3/32 inch gap. The short blade should have a 1/32 inch
follow thru.
NEVER LUBRICATE THE PLUNGER.
The only
lubrication required is the link assembly with the special
coin machine lubricant.
Weak or sluggish flipper action can be due to dirty or
improperly adjusted contact points, worn out coil sleeve,
loose or broken bushing, incorrect coil or shorted diodes,
worn ouefiber links, weak or broken return spring, loose
coil between the retaining bracket and coil stop, or loose
screws. Check all of the above to correct.
PLUMB BOB TILT
The plumb bob tilt can be made sensitive by raising the
plumb bob on the shaft. It can also be made less sensitive
by lowering the bob on the shaft.
SUPER SLAM TILT
The super slam tilt on the coin door is adjustable. The
normal adjustment is contacts open 1/32 inch.
PLA YFIELD TILT
The playfield tilt is adjustable by forming the switch con-
tacts. Closing the gap will make the tilt more sensitive.
ROLL TILT
The roll tilt in the cabinet box can be raised (more sensi-
tive) or lowered (less sensitive) at the front pivot slot.
SECTION 9
SPARE PARTS
The parts used on the solid state DISCO FEVER are stan-
dard Williams parts. Refer to Figure 12 for identification
of various playfield parts and adjustments.
PLA YFIELD CARE
The playfield on this machine has an improved finish with
excellent wearing properties. DO NOT clean the board
with water, water soap solutions, or harsh abrasives .
Avoid using steel wool, kitchen cleansers, or abrasive
hand soap. Water will weaken the adhering of the paint to
the board and abrasives shorten the board life.
A wax base cleaner with negligible abrasive qualities used
lightly, but frequently, will extend board life to its full
capabilities.
BACKGLASS REMOVAL
Unlock the key lock (Figure 1, - No.4) then lift the glass
up and out.
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