Canon iR5055, Service Manual

Page: 198 / 646

Chapter 7
7-14
reading reaches '250,000'.
7.6.3 Drum/Separation Claw Bias Control
0015-9606
iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
Since the separation claw contacts the drum, toner caught by the separation claw can fall in the feeder path as the machine is getting aged.
Such events can cause the soiled back or faulty images.
As a countermeasure, the machine supplies the AC bias voltage (Vpp430V) to the separation claw, which generates vibration to prevent the toner from accumulating
in the separation claw.
F-7-22
7.7 Developing Assembly
7.7.1 Controlling the Developing Assembly Drive
0015-4499
iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
The following shows the construction of the developing assembly drive control system:
F-7-23
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
0015-4500
iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
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
DC-CON
HVT
Separation
Claw AC
Bias PCB
Separation
Claw
CL1
Developing clutch
M1
DC controller PCB
DRUM_M_ON
0V
DRUM_M_FG
5V
DEV_CL_ON* [1]
24V
J108B
J108A