Canon imageRUNNER ADVANCE C5500 Series Service Manual page 92

Note that since this machine has the high voltage circuits independent for each color, different biases can be applied for each
color.
Charging control superimposes an AC bias in addition to the primary charging DC bias using the Charging Roller adjacent charging
method.
■ Charging DC Bias
The setting value of the charging DC bias is determined by D-max control
image density can be achieved.
Related Service Mode
Display of the each color developing DC bias:
(Level 2) COPIER > Display > DENS > DEV-DC-Y
(Level 2) COPIER > Display > DENS > DEV-DC-M
(Level 2) COPIER > Display > DENS > DEV-DC-C
(Level 2) COPIER > Display > DENS > DEV-DC-K
Adjustment of the each color fogging removal potential:
COPIER > Adjust > V-CONT > VBACK-Y
COPIER > Adjust > V-CONT > VBACK-M
COPIER > Adjust > V-CONT > VBACK-C
COPIER > Adjust > V-CONT > VBACK-K
Adjustment of the each color contrast potential:
COPIER > Adjust > V-CONT > VCONT-Y
COPIER > Adjust > V-CONT > VCONT-M
COPIER > Adjust > V-CONT > VCONT-C
COPIER > Adjust > V-CONT > VCONT-K
Display of the each color primary charging DC voltage:
COPIER > Display > DENS > CHG-DC-Y
COPIER > Display > DENS > CHG-DC-M
COPIER > Display > DENS > CHG-DC-C
COPIER > Display > DENS > CHG-DC-K
■ Charging AC Bias Control
For AC bias, discharge current control is performed to calculate an appropriate Vpp (potential difference between the maximum
value and minimum value of the AC voltage waveform).
UN1
DC Controller PCB
UN77
Charging High-Voltage PCB (YMC)
78
Photosensitive Drum
Charging Roller
("D-max Control" on page 97) so that the optimal
2. Technology