Canon 1000 Service Manual page 440

a. Checking the Transfer System
START
Is the test
YES
print considerably
light?
Is the
NO
locking/releasing
YES
operation of the
transfer blade
normal?
NO
Check the drive system of
the transfer blade.
Is uneven
NO
density or white
spots noted on TYPE=4
Test Prints?
Check the transfer blade.
Check the transfer belt.
NO
Check the environment sensor.
Check the latent static
image formation system.
7-4
b. Checking the Latent Static Image Formation System
START
Is the pre-exposure
lamp ON?
YES
Check HVT-1. Is the
setting for a specific
color for 'V00' of 'EPOT'
under 'DISPLAY' in service
mode within the
optimum
range?
YES
Is the
setting for a specific
color for 'VFF' of 'EPOT'
under 'DISPLAY' in service
mode within the
optimum
range?
YES
Check the developing system.
NO
Check the pre-
exposure lamp
and the
activation
circuit system.
NO
Optimum range
• Check the
VOO-Y 350~800
primary
VOO-M 350~800
output system.
VOO-C 350~800
• Check the
VOO-K 350~800
potential
VFF-Y 50~300
control system.
VFF-M 50~800
NO
VFF-C 50~800
VFF-K 50~800
• Check the laser
output system.
• Check the
potential
control system.
COPYRIGHT © 2001 CANON INC.2001200120012001CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
c. Checking the Developing System
START
Is the
setting for a specific
NO
color for 'DENS', 'SGNL',
and 'REF' of 'DENS' under
'DISPLAY' in service
mode within the
For Y/M/C, check
optimum range? Optimum range
• developing high-voltage system
SGNL-Y 700~912
• toner supply system
YES
SGNL-M
700~912
• color toner density sensor
DENS-C 700~912
REF-Y 377~848
REF-M 377~848
REF-C 377~848
Is the
setting for a specific
NO
color for 'SGNL-S' and 'REF-S'
of 'DENS' under 'DISPLAY'
in service mode within
the optimum
Optimum range For Y/M/C, check
range?
• developing high-voltage system
SGNL-S-Y 640~850
• toner supply system
YES
SGNL-S-M 640~850
• SALT sensor
SGNL-S-C 640~850
SGNL-S-K 192~389
REF-S-Y 464~544
REF-S-M
464~544
REF-S-C 464~544
REF-S-K 464~544
SGNL-D-Y
380~900
SGNL-D-M 380~900
SGNL-D-C
380~900
SGNL-D-K
300~720
Is a similar
YES
density fault noted
for all colors?
Check the HVT-3B PCB.
NO
YES
Is the fault noted
for Y and M only?
Check the HVT-3AR PCB.
NO
Check the HVT-3AL PCB.