Drum/Separation Claw Bias Control; Developing Assembly; Controlling The Developing Assembly Drive; Controlling The Developing Bias - Canon iR5055 Series Service Manual

Chapter 7
reading reaches '250,000'.

7.6.3 Drum/Separation Claw Bias Control

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.
DC-CON

7.7 Developing Assembly

7.7.1 Controlling the Developing Assembly Drive

iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
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

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
7-14
Separation
Claw AC
HVT
Bias PCB
F-7-22
24V
DEV_CL_ON* [1]
DRUM_M_FG
DRUM_M_ON
M1 CL1
5V
0V
Developing clutch
F-7-23
Separation
Claw
0015-9606
0015-4499
0015-4500