3. OPERATION AND TIMING
COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-92
a.
Procedure for Drum Surface Potential
Control at Power-On
Table 3-502
b.
Procedure for Computation and Associated Detail Codes
Step
1
2
3
4
5
6
7
8
9
Drum rotation
1st rotation
2nd rotation
3rd rotation
4th rotation
Computes based on measurements
Grid output
Vg1 (-300V) output
Vg2 (-700V) output
Laser output
V
FF
output
V
00
output
V
FF
output
V
00
output
Measures V
L
1’
Measures V
L
2’
Measures V
D
1’
Measures V
D
2’
Measures V
L
1
Measures V
L
2
Measures V
D
1
Measures V
D
2
Table 3-503
Step
1
2
Checks
Measured value
check
VD/VL check
(computed
based on
measured
value)
Detail code
xx01
xx02
xx03
xx04
xx10
xx11
xx12
xx13
xx14
xx15
xx16
xx17
Description of detail code
Difference of the measured value
of VD1 is 30 V or more
Difference of the measured value
of VD2 is 30 V or more
Difference of the measured value
of VL1 is 30 V or more
Difference of the measured value
of VL2 is 30 V or more
VD1 is 500 V or more and, in
addition, VD2 is 900 V or more
VD1 is 900 V or more and, in
addition, VD2 is 900 V or more
VD1 is 200 V or less and, in
addition, VD2 is 600 V or less
VD1 is 150 V or less and, in
addition, VD2 is 300 V or less
VD1 and VD2 both are 150 V or
less
VD1, VD2, VL1, and VL2 are all
10 V or less
Difference between VD1 and VL1
is 20 V or less and, in addition,
VD1 is 200 V; or, difference
between VD2 and VL2 is 20 V or
less and, in addition VD1 is 600
V or more
VL1 is 200 V or more and VL2 is
400 V or more
Possible cause
Potential circuit PCB (faulty)
DC controller PCB (faulty)
Pre-exposure lamp (faulty)
Pre-primary, primary charging
assembly (faulty)
HV2 PCB (faulty)
Primary charging assembly (faulty)
HV2 PCB (faulty)
Laser power adjustment (faulty)
Laser unit (faulty)
Video controller PCB (faulty)
Primary charging assembly (faulty)
HV2 PCB (faulty)
Potential control PCB (faulty)
Scanner (faulty)
Laser unit (faulty)
Video controller PCB (faulty)
Laser (fails to emit a beam)
Laser unit (faulty)
Video controller PCB (faulty)
Laser power adjustment (faulty)
Intensity at VFF (too high)
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