Developing Assembly; Controlling The Developing Assembly Drive; Controlling The Developing Bias - Canon iR6570 series Service Manual

Chapter 7

7.7 Developing Assembly

7.7.1 Controlling the Developing Assembly Drive

The following shows the construction of the developing assembly drive control system:
The following signal is associated with the developing assembly control mechanism:
[1] Developing clutch drive signal; when '0', the drive of the main motor (M1) is transmitted to the developing assembly.

7.7.2 Controlling the Developing Bias

The following items are associated with the developing bias control system:
[1] Controlling the DC bias constant voltage
[2] Controlling the AC bias constant voltage
The following signals are used in association with the developing bias control mechanism:
[1] Developing DC bias current control signal; controls the DC component of the developing bias generated by the high-voltage power supply PCB.
[2] turns on/off the developing bias current output.
SERVICE MODE:
COPIER>ADJUST>DEVELOP>BIAS
(entering developing bias)
Enter the value indicated on the service label if you have initialized the DC controller PCB.
setting range: 0 (darker) to 600 (lighter)
COPIER> ADJUST> DEVELOP> HVT-DE
(entering offset value for developing high-voltage output of high-voltage unit)
Enter the value indicated on the label attached to the new high-voltage unit if you have replaced the DC controller PCB or initialized the RAM on the DC
controller PCB.
setting range: -100 (lighter) to +100 (darker)
COPIER> ADJUST> DEVELOP> D-HV-DE
(entering offset value for developing high-voltage output of DC controller PCB)
Enter the value indicated on the label attached to the DC controller PCB if you have replaced the DC controller PCB or initialized the RAM on the DC
controller PCB.
7-18
24V
DEV_CL_ON* [1]
DRUM_M_FG
DRUM_M_ON
M1
5V
0V
Developing clutch
F-7-22
HVT_DEV_BIAS
_DC [1]
HVT_DEV_BIAS
_DC [2]
F-7-23
CL1
AC output 1200Vpp
Developing cylinder
0009-4118
0009-4119