Epc (Photosensitive Drum Potential Measurement) - Canon 1000 Service Manual

7. TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS

9. EPC (photosensitive drum potential measurement)

DISP COUNTER
ADJUST
FUNC
OPTION
TEST
DISP COUNTER
ADJUST
FUNC
OPTION
TEST
Item
EPC
POTOFSTY/M/C/K
OFFSET
V00-300V
V00-700V
VFF-300V
VFF-700V
COPYRIGHT © 2001 CANON INC.
7-268
<M> <S> 1/2
EPC
EPC
V
V00-300V-Y V00-300V-M
XX
VFF-300V-Y VFF-300V-M
XX
V00-700V-Y V00-700V-M
XX
VFF-700V-Y VFF-700V-M
XX
<M> <S> 2/2
EPC
EPC-Y EPC-M
xxx
POTOFSTY POTOFSTM
xxx
OFFSET-Y OFFSET-M
xx
Description
Executes potential measurement on the photo-
sensitive drum.
Indicates the offset value for the potential sen-
sor.
Executes offset adjustment on the potential
measurement circuit of the photosensitive drum.
Indicates the photosensitive drum surface
potential when the grid bias potential of the
primary charging assembly is –300 V and the
laser output is V00.
Indicates the photosensitive drum surface
potential when the grid bias potential of the
primary charging assembly is –700 V and the
laser output is V00.
Indicates the photosensitive drum surface
potential when the grid bias potential of the
primary charging assembly is –300 V and the
laser output is VFF.
Indicates the photosensitive drum surface
potential when the grid bias potential of the
primary charging assembly is –700 V and the
laser output is VFF.
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
<R>
V00-300V-C
XX XX
VFF-300V-C
XX XX
V00-700V-C
XX XX
VFF-700V-C
XX XX
<R>
READY
EPC-C EPC-K
xxx xxx
POTOFSTC POTOFSTK
xxx xxx
OFFSET-C OFFSET-K
xx xx
<P> <F>
V00-300V-K
XX
VFF-300V-K
XX XX
V00-700V-K
XX
VFF-700V-K
XX
<P> <F>
xxx
xxx
xx
Remarks
The potential measure-
ment data is used for the
next copying run.
The potential measure-
ment data is used for the
next copying run.
Approximate value:
250~350
Approximate value:
650~750
Approximate value:
10~150
Approximate value:
50~250