Controlling The Transfer Charging Mechanism; Outline - Canon GP605 Service Manual

E.

Controlling the Transfer Charging Mechanism

1.

Outline

The transfer charging mechanism is controlled for the following:
[1] DC bias constant current
[2] Output to suit the environment (fuzzy control)
[3] Output correction at the trailing edge of paper
Figure 6-309 shows the construction of the transfer charging control system.
When '1', high voltage output is ready.
J510A
1
HVDC-EN
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
A voltage input between 0 and 12 V,
used to control the transfer current
output.
Figure 6-309 Construction of the Control System
COPYRIGHT © 1999 CANON INC.
Relay PCB
1 2 3 4
0 V
1
2
3
4
5
TR-CNT
6
TR-ERR
7
8
9
10
11
12
13
14
15
16
When an overcurrent or
an under current is
detected, '1'.
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 IMAGE FORMATION SYSTEM
T701
The transfer current varies as follows
according to the TR-CNT potential.
-650µA
Transfer charging wire
TR-CNT
3V
11V 12V
6-27