Controlling The Primary Corona Roller Cleaning Mechanism; Outline; Primary Charging Roller Cleaning Operation - Canon NP6218 Service Manual

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
cleaning solenoid
4-20
Figure 4-118
COPYRIGHT © 1997 CANON INC.
Fulcrum Fulcrum Cleaning pad
Drum unit
CANON NP6218 REV. 0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Primary
charging
roller
Drum