Table 3-2 Explanation Of ~Start~ Flowchart - Canon NP-70 Service Manual

NP•70
3-11
Block
Actions Occurring
Due to the operation of MS3A, the delay hold path for K7 is activated — Q22 is
turned ON. This path is necessary so that relay K7 will be held active after the
deenergization of K6 (FL2 & 3 —OFF) and, thus, permit the drum approximately
one extra Revolution before it stops. The extra revolution permits the clearing of
charges from the drum and prolongs the effective life of the drum CdS material.
STEP 4S
Capacitor
C16 completes ifs discharging and the illumination lamps are turned OFF.
Additionally, Q21 is turned OFF so that opening of the conduction path between
K7 and Q22 will result in the turning OFF of Q22 and, thus, the deenergization of
K7.
STEP SS
The delay hold path for relay K7 is opened resulting in deenergization of the relay.
The drum will continue to turn, however, until the alternate path for voltage to
main motor M 1 (through MS4) is opened.
STEP 6S
The alternate path for voltage to M 1 is broken at this time and the motor, the AC
coronas, and the overall exposure lamp are turned OFF. The drum, due to
mo-
mentum, will turn until approximately 297° to complete its sixth revolution.
STEP
7S
The machine is now in STANDBY awaiting the depressing of the COPY button to
start copy operation.
END
Table 3-2
Explanation of START ~ Flowchart
© CANON INC..
Second Printing,lune, 1974