Canon iR5055, Service Manual

Page: 193 / 646

Chapter 7
7-9
F-7-13
The following is the signal associated with the mechanism:
[1] Pre-exposure LED control signal; when '0', LED goes on
7.5.2 Primary Charging Mechanism
7.5.2.1 Overview
0015-4488
iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
The following items are associated with the primary charging control system:
1. turning on/off the primary corona current
2. controlling the constant current level of the primary corona current
3. controlling the constant voltage level of the grid bias (fixed to 850 V by a valista)
The following shows the construction of the control system associated with the primary charging control system:
F-7-14
The following signals are associated with the mechanism:
[1] Primary charging leakage detection signal; when '0', if the current is too high or too low
[2] Primary corona current control signal; used to control the primary charging current generated by the high-voltage PCB
[3] High-voltage remote signal; turning on/off the primary charging corona current output
7.5.2.2 Primary Charging Assembly Cleaning Mechanism
0015-4489
iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
The primary charging wire cleaning mechanism is turned on at the following timing, and the construction of the control system is as shown:
Timing of Cleaning
- when the wire cleaning mechanism is executed in user mode
- when the wire cleaning mechanism is executed in service mode:
COPIER>FUNCTION>CLEANING>WIRE-CLN*1
- after the end of cleaning, at the end of every 2,000 prints*2
- in a low temperature or high humidity environment, if the fixing roller is 160 deg C or less when the power is turned on
*1: The machine executes it when the primary charging wire or the transfer charging wire has been replaced.
*2: The default cleaning interval may be changed in service mode (COPIER> OPTION> BODY> W-CLN-P).
DC-CON
Pre-exposure lamp
24V
PRE_LED_ON* [1]
J103A
DC controller PCB
High-voltage PCB
PRIMARY-LEAK-
DETECT [1]
HVT-REMOTE [3]
Primary charging wire
Grid wire
HVT-PRIMARY [2]
J102A
J4502