COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-93
3. OPERATION AND TIMING
Table 3-504
Step
3
4
5
6
7
Detail code
xx22
xx26
xx20
xx23
xx25
xx21
xx24
xx27
xx28
xx30
xx31
xx32
xx33
xx34
xx35
xx36
xx50
xx51
xx52
xx53
Description of detail code
Computed value of Vg is upper
limit (950 V) or more
Computed value of Vg is lower
limit (250 V) or less
V00 is upper limit (800 V) or
more
V00 is upper limit (950 V) or
more
V00 is lower limit (325 V) or less
VDC is upper limit (750 V) or
more
VDC is lower limit (950 V) or
more
VFF is upper limit (700 V) or
more
VFF is lower limit (0 V) or more
VD1 is upper limit (400 V) or
more
VD1 is lower limit (200 V) or less
VD2 is upper limit (800 V) or
more
VD2 is lower limit (500 V) or less
VL1 is upper limit (200 V) or
more
VL2 is upper limit (400 V) or
more
VL2 is lower limit (0 V) or less
Difference between previous VD
and newly computed VD is 30 V
or more
Difference between previous VG
and newly computed VG is 30 V
or more
V00 is upper limit (950 V) or
more
V00 is lower limit (325 V) or less
Possible cause
Photosensitive drum
(deterioration)
Laser output (inadequate)
Photosensitive drum (deterioration)
Laser output (inadequate)
Laser output (excessive)
Grid plate (faulty)
Photosensitive drum (deterioration)
Laser output (inadequate)
Laser output (excessive)
Grid plate (faulty)
Photosensitive drum
(deterioration)
Laser power adjustment (faulty)
Laser unit (faulty)
Video controller PCB (faulty)
Potential control PCB (faulty)
DC controller PCB (faulty)
Photosensitive drum
(deterioration)
Laser shutter (faulty operation)
Laser power adjustment (faulty)
Laser unit (faulty)
Video controller PCB (faulty)
Checks
Vg check
(computed
based on
measured value)
Laser output
value (V00)
check
(computed
based on
measured
value)
Developing bias
check (computed
based on
measured value)
Laser output
(VFF) check
(computed
based on
measured value)
VD/VL check
(computed
based on
measured
value)
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