Canon PC980 Service Manual - Page 41

CHAPTER 2 BASIC OPERATION D. Controlling the Main Motor (M1) 1. Outline Table 2-102 shows the functions of the main motor control circuit, and Figure 2-104 is a block diagram of the circuit. Item Power supply Description 24 VDC from the composite power supply. Drive signal Signal (MMD) from the DC controller PCB. Moving/drive parts Photosensitive drum, primary charging roller, developing assembly, transfer charging roller, pickup roller, vertical roller, registration roller, feeding assembly, fixing assembly, delivery roller, heat exhaust fan Control Executes on/off control. Executes constant speed rotation control. Error detection Issues 'E010'. Table 2-102 DC controller PCB J103 J203 -6 -3 J104 J204 -1 -7 +24V J205 J901 -4 24V -1 -3 GND -2 -2 MMD -3 -1 MLOCK -4 Phase control drive circuit Drive current Clock pulse generator Main motor (M1) Hall IC output MMCLK Composite power supply PCB Reference signal Main motor drive PCB Figure 2-104 COPYRIGHT © 1999 CANON INC. CANON PC800s/900s REV.0 AUG. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON) 2-5