Canon NP6218 H. Controlling the Primary Corona Roller Cleaning Mechanism, 4-20, Outline, charging

CHAPTER 4 IMAGE FORMATION SYSTEM

H. Controlling the Primary Corona Roller Cleaning Mechanism

1. Outline

The copier’s primary charging roller is equipped with an automatic cleaning mechanism.

The automatic cleaning mechanism cleans the primary charging roller during initial rotation(INTR) after having made 250 or more copies, i.e., after executing transfer roller release control five times.

2. Primary Charging Roller Cleaning Operation

The primary charging roller cleaning solenoid (SL4) on signal (PCLSLD) is generated under the control of the microprocessor (Q301) on the DC controller PCB. In response to the signal, the cleaning pad is butted against the roller for 2 sec, during which time the cleaning roller makes about 4 rotations.

Primary charging roller	Fulcrum Fulcrum Cleaning pad	Primary
cleaning solenoid		charging
		roller

Drum unit Drum

Figure 4-118

4-20 COPYRIGHT © 1997 CANON INC. CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)