Stopping The Hopper Motor In Response To A Rotation Error - Canon NP6330 Service Manual

CHAPTER 4 IMAGE FORMATION SYSTEM
C. Stopping the Hopper Motor in Response to a Rotation Error
If an excess load is imposed on the hopper motor (M4) and, as a result, variation
occurs in its rotation, the level of current entering the comparator circuit lowers and the
comparator circuit generates a negative voltage, causing the transistors Tr
turn off and stopping the hopper motor.
Since the developing assembly will not be supplied with toner while an error exists
in the motor, the "Add Toner indicator" will be indicated.
DC
controller
PCB
4-24
J106 J202
-5B HMD -11
*
Figure 4-203
COPYRIGHT © 1997 CANON INC.
±24VB
Tr
2
±5V
±5V
Tr
1
Comparator
Motor driver 1 PCB
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
and Tr
1
J206
-8
M4
Hopper motor
-7
to
2