3. Printed Circuit and, Riveted Disc Units
Examples of these are the bonus, the player up, the ball
count, the coin and the 00-90 units. The force exerted
on the disc contacts by the rotor requires lubrication of
the disc contacts. Periodic maintenance must include an
inspection for the presence of lubrication and for contact
condi tion. Touching the contacts with the fingers should
resul t in a shiny trace on the finger. This, and absence
of contact pitting and dirt indicate a satisfactory oper-
ating condition. Contact pitting can be corrected with
a contact file and burnishing tool. Dirt shoul~ be re-
moved with a clean, lint free cloth. If contact 'cleaning
fluids are used to remove greasy dirt, a cloth must be
used to remove any chemical residue. Finally, apply Bally
coin machine lubricant to a clean cloth. Apply a thin film
to the contact surfaces.
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If, in trouble shooting, a rotor blade is suspected as the
source of the problem, it can be checked for proper ad-
justment. A blade exerting too little pressure can be
intermi ttant. A blade exerting too much
pressure may slow
or stop the rotor. A check for the force exerted by the
rotors can be made as follows: gently warp the disc or
printed circuit board away from the rotor. The rotor
blade should follow the disc or board for 1/3211 before
contact is broken. If it follows further, contact force
is too great. If it breaks contact too soon, contact
force is not great enough. Use a contact adjusting tool
to adjust the rotor blade pressure.
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4. Credi t Uni t
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The credit unit is used to store in memory the numer of
credi ts or games due a player. Credits are payed for or
won for high score, match feature or as a special game
feature. Improper adjustment of the credit unit can re-
sult in too many or too few credits issued to the player.
To check for proper adjustment of the credit unit: (See
Figure III-3)
a) Slowly hand actuate the step-up plunger. The step-up
arm must not engage the next tooth on the ratchet
(occasional engagement is acceptable). If the step-
up arm does1 gently bend the
base plate tab down (away
from the step-up solenoid) until hand actuation does
not cause consistent engagement of the next tooth on
the ratchet. This adjustment, properly made, prevents
mul tiple crediting when only one credit is due the
player.
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