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TESS OPERATIONS 00900702905 CRESS
ST
G. Controlling the Belt Motor
1.
Outline
Figure 3-721 is a diagram showing the
control circuit for the belt motor (M2).
The belt motor is a 4-phase control step-
ping motor.
The CPU (Q1) on the ADF controller
PCB sends contro! pulse signals (A, A*, B,
B*) to the motor driver (Q4).
In response, the motor driver changes
the output timing of the pulse signals (MA,
MA*, MB, MB*) used for driving the motor to
rotate the belt motor clockwise or counter-
clockwise.
The motor driver is equipped with a lim-
iter function used to keep the motor supplied
with a specific current so that current greater
than specified will not flow.
If loads large enough to activate the lim-
iter function occur in succession, the belt
motor cannot rotate as specified, possibly
leading to feeding faults. Any feeding fault
will cause the ADF controller to flash the
Jam indicator on the controller and stop the
belt motor at the same time.
ADF contro HerPCB
$
+2av
Belt motor
Figure 3-721
3-80
COPYRIGHT © 1995 CANON INC,
CANON NP6OT2/NPSOT2F /NP6212 REV.1 SEPT. 1995 PRINTED IN JAPAN (IMPRIME AU JAPON)
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