Controlling Transfer Charging; Outline; Controlling The Output To Suit The Environment (Fuzzy Control) - Canon Image Reader-A1 iR5000i Service Manual

3.5 Controlling Transfer Charging

3.5.1 Outline

The system used to control transfer charging serves the following functions:
1. Controlling the DC bias to a specific level of current.

2. Controlling the output to suit the environment (fuzzy control).

The following shows the construction of the control system related to the transfer charg-
ing control system.
J102A
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TR-LEAK-DETECT [1]
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11
TR-CNT [2]
12
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PR/TR-REMOTE [3]
16
The system uses the following signals:
[1] transfer charging leakage detection signal; '0' when an excessively high or low current
is detected.
[2] transfer charging current control signal; when about 3 V or higher and lower than 11 V,
the output of the transfer current turns ON; when about 12 V or higher, it turns OFF.
[3] high-voltage remote signal; turns on/off the transfer current output.
COPYRIGHT © 2001 CANON INC.
J4502
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F04-305-01
2000 2000 2000 2000 CANON iR5000i/iR6000i REV.0 JUNE 2001
CHAPTER 4 IMAGE FORMATION SYSTEM
The transfer current varies
as follows in keeping with
the potential of TR-CNT.
400µA
100µA
T4505
3V
11V 12V
TR -CNT
Transfer
charging wire
4-27 P