Canon IR2200, IR3300, IR2800 manual Detecting Errors, F06-303-01

CHAPTER 6 FIXING SYSTEM

3.3 Detecting Errors

The machine checks for the following in relation to its fixing temperature control mecha- nism:

1.Temperature control error by main thermistor (TH1)

2.Temperature control error by sub thermistor (TH2)

The following signals are used in association with errors:

[1]Fixing temperature detection signal 1 (M_TH2): voltage output according to the reading of the main thermistor.

[2]Fixing temperature detection signal 2 (S_TH2): voltage according to the reading of the sub thermistor.

[3]Main heater drive signal: when ‘1’, the main heater goes ON.

[4]Sub heater drive signal: when ‘2’, the sub heater goes ON.

[5]Relay drive signal (RLY_1): when ‘1’, the relay (RL1) on the main power supply PCB goes ON.

Switch PCB

RelayRL1

DC control PCB

Main power supply PCB

+5V[5]

Heater relay circuit

Fixing main heater (H1)

Fixing sub heater (H2)

Thermal switch (TP1)

Fixing main thermistor

TH1

TH2

Fixing sub thermistor

[1]

[2]

High- temperature detection circuit

A/D converter

(200V)

+5V

[4]

IC300

IC334

+5V

[3]

F06-303-01

COPYRIGHT © 2001 CANON INC. CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001 6-9 P