Canon PC420 - Page 6

COPYRIGHT © 1998 CANON INC. CANON PC400/420/430,FC200/220 REV.0 JAN.1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
iv
CHAPTER 4 IMAGE FORMATION SYSTEM
I. PROCESS DESCRIPTION..........4-1
A. Outline ....................................4-1
B. Sequence of Image Formation
Operations (A4, 2 copies).......4-2
C. Primary Charging Control Circuit
................................................4-3
1. Outline ...............................4-3
2. Operations .........................4-4
D. Controlling Developing Bias....4-6
1. Outline ...............................4-6
2. Operations .........................4-8
E. Transfer Charging Control Circuit
..............................................4-10
1. Outline .............................4-10
2. Operations .......................4-11
F. Document Density Measurement
(AE; PC420/430/FC220).......4-14
1. Outline .............................4-14
2. Operations .......................4-14
3. Adjusting the AE Mechanism
(VR602, VR603) ..............4-15
II. CHARGING, DEVELOPING, AND
CLEANING SYSTEMS ..............4-17
A. Cartridge...............................4-17
1. Outline .............................4-17
III. MECHANICAL SYSTEM............4-18
A. Photosensitive Drum.............4-19
1. Cleaning the Drum...........4-19
B. Transfer Charging Roller.......4-20
1. Cleaning the Transfer
Charging Roller................4-20
2. Detaching the Transfer
Charging Roller................4-20
CHAPTER 5 PICK-UP/FEEDING SYSTEM
I. OUTLINE .....................................5-1
II. CONTROLLING THE PICK-UP
ROLLER.......................................5-2
A. PC420/430/FC220..................5-2
B. PC400/FC200.........................5-3
III. CONTROLLING THE
REGISTRATION ROLLER...........5-4
A. Outline ....................................5-4
B. Pick-Up/Feeding Timing Chart
(A4, 2 copies)..........................5-5
IV. CHECKING FOR JAMS...............5-6
A. Delivery Delay Jam.................5-6
1. PC420/430/FC220.............5-6
2. PC400/FC200....................5-6
B. Delivery Stationary Jam..........5-7
1. PC420/430/FC220.............5-7
2. PC400/FC200....................5-7
C. Pick-Up Delay Jam
(PC420/430/FC220)................5-8
D. Pick-Up Stationary Jam ..........5-9
1. PC420/430/FC220.............5-9
2. PC400/FC200....................5-9
E. Paper is present at the pick-up or
delivery sensor at time of power-
on or when the Copy Start key is
pressed...................................5-9
V. MECHANICAL SYSTEM............5-10
A. Pick-Up Roller Assembly.......5-11
1. Detaching the Pick-Up Roller
.........................................5-11
B. Registration Roller Assembly
..............................................5-14
1. Detaching the Registration
Roller Assembly...............5-14
C. Removing the Separation Pad
..............................................5-15
CHAPTER 6 FIXING SYSTEM
I. OUTLINE OF OPERATIONS.......6-1
A. Outline ....................................6-1
B. Controlling the Fixing Heater
Temperature............................6-3
C. Controlling the Supply Power to
the Fixing Heater ....................6-3
D. Protection Mechanisms ..........6-5
II. MECHANICAL SYSTEM..............6-6
A. Fixing Assembly......................6-7