C. Stopping the Hopper Motor in Response to a Rotation ErrorIf an excess load is imposed on the hopper motor (M4) and, as a result, variationoccurs in its rotation, the level of current entering the comparator circuit lowers and thecomparator circuit generates a negative voltage, causing the transistors Tr1 and Tr 2 toturn off and stopping the hopper motor.Since the developing assembly will not be supplied with toner while an error existsin the motor, the “Add Toner indicator” will be indicated.Figure 4-2034-24CHAPTER 4 IMAGE FORMATION SYSTEMCOPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)-5B -11HMD*J106 J202-8-7J206DCcontrollerPCB±5V±24VB±5VHopper motorM4ComparatorMotor driver 1 PCBTr2Tr 1
