Canon 1000 Service Manual page 137

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