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II. SPECIFICATIONS ................................. I-2
A. Type ................................................. I-2
B. Construction ..................................... I-2
C. Pefformance .................................... I-3
D. Others .............................................. I-4
A. Externa1 View ................................... I-7
B. Cross-Sectional View ....................... I-8
IV. OPERATION .......................................... I-9
A. Control Panel ................................... I-9
B. Making Copies ................................. l-10
IMAGE FORMATION PROCESS ..........
A. Outline ...............................................
BASIC MECHANISMS ........................... 3-1
A. Functional Construction ...................
C. Inputs lo DC Controller ....................
D. Outputs from DC Conlroller ............. 3-8
E. Basic Sequence ............................... 3-I 1
ll. EXPOSURE SVSTEM ........................... 3-13
A. Varying the Reproduction Ratio.. ..... 3-13
B. Lens Drive Syiem ............................. 3-14
C. Scanner Drive System ..................... 3-18
D. Document Size Identification ........... 3-21
A. Outline .............................................. 3-24
B. Basic Sequence of Image
Formation ......................................... 3-25
C. Controlling the Scanning Lamp.. ...... 3-26
D. Controlling the Primaryflransfer
Corona Current and the Grid Bias
E. Controlling the Development Bias.. .. 3-30
F. Measuring the Document Density.. .. 3-33
2-1
2-1
3-l
3-4
C A N O N NP2120/2020 RN.1 DLC. 1592 PRIHTEO IN JAPAN [IMPRIME AU JAPONI
E. Making Two-Sided Copies ............... 1-I 0
F. Making Overlay Copies. ...................
V. WARNINGS AND ACTIONS TO TAKE
A. JAM Indicator ( 8% ) '........................ I-12
C. ADD TONER Indicator ( h ) .......... I-13
D. CONTROL CARD Indicator (w)
E. @glndicator.. ................................ l-13
VI. ROUTINE WORK BV THE USER .......... l-14
A. Blank Exposure Mechanism ............ 2-6
B. Ozone Filter ..................................... 2-6
G. Developing Assembly and Drum
Cleaning Unit ................................... 3-36
H. Blank Control ................................... 3-37
Controlling the Transfer Corona
Wire Cleaning Mechanism ............... 3-38
IV. PICK-UP/FEED SVSTEM ...................... 3-39
A. Outline .............................................. 3-39
B. Identifying the Cassette Size ........... 3-43
C. Fixing Assembly and Delivery
Assembly ......................................... 3-44
D. Error Detection Circuit (NP2020) ..... 3-47
E. Error Detection Circuit (NP2120) ..... 3-47a
F. Jam Detection .................................. 3-48
V. POWER SUPPLV ................................... 3-52
A. DC Power Supply ............................. 3-52
B. DC Power Supply for Options .......... 3-53
VI. SERVICE MODES ................................. 3-55
A. Outline.. ............................................ 3-55
B. Using the Service Mode ................... 3-56
VII. SELF DIAGNOSTIC MECHANISM ........ 3-57
l-12
... l-13
..................... 2-6
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