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COPYRIGHT
©
1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 4
IMAGE FORMATION SYSTEM
I. OUTLINE OF THE PROCESSES............ 4-1
A. Outline ................................................ 4-1
B. Basic Sequence of Operations
(image formation system) .................. 4-2
C. Controlling the Intensity of the
Scanning Lamp .................................. 4-3
D. Controlling the Primary/Transfer Bias .. 4-6
E. Controlling the Developing/Separation
Static Eliminator Bias ......................... 4-7
F. Controlling the Blank Exposure Lamp ... 4-12
II. DEVELOPING ASSEMBLY/DRUM
CLEANER ASSEMBLY .......................... 4-14
A. Outline .............................................. 4-14
B. Detecting and Controlling
the Level of Toner ............................ 4-16
C. Monitoring the Waste Toner
Feeding Screw ................................. 4-17
D. Monitoring the Waste Toner Box ..... 4-18
E. Control by the Cleaner Thermistor... 4-20
F. Auto Density Adjustment (AE) ......... 4-21
III. DISASSEMBLY/ASSEMBLY ................. 4-23
A. Scanning Lamp Assembly ............... 4-24
B. Exposure Assembly ......................... 4-26
C. Drum Unit ......................................... 4-28
D. Primary Charging Assembly ............ 4-30
E. Transfer Charging Assembly ........... 4-31
F. Charging Wire .................................. 4-32
G. Developing Assembly....................... 4-37
This chapter discusses the principles of how images are formed. It also explains the timing at which the
various units involved in image formation are operated, and shows how they may be disassembled/
assembled and adjusted.