Canon GP335 Service Manual page 287
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Also See for GP335:
- Installation instructions (4 pages) ,
- Service manual (682 pages) ,
- Service handbook (200 pages)
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Fixing temperature
control
DC-
CPU
J113-B1
TH1
Image
processor
PCB
TH2
J114-B13
H2-D
J114-B12
H1-D
J114-B11
H1-ERR
SSR
J114-B14
H2-ERR
Figure 9-104 Error Monitoring Block of the Fixing Heater
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Main Thermistor Overheating Detection Block Diagram
Overheating
detection
circuit
230˚C
J114
-A7
Sub Thermistor Overheating/Open Cir cuit Detection Block Diagram
Phase signal
Open circuit detection: L
Overheating detection: H
J114
-A9
Overheating/
open detection
circuit
245˚C
J114
-A10
SSR Short Circuit Detection Block Diagram
Main heater
activation
detection
circuit
Sub heater
activation
detection
circuit
CHAPTER 9 FIXING SYSTEM
DC controller circuit
Hard relay off signal 1
(main thermistor error signal)
Timer circuit
Hard relay off signal 2
(sub thermistor error signal)
To DC-CPU
To DC-CPU
To DC-CPU
Timer circuit
Hard relay off signal 3
(SSR error signal)
Timer circuit
Main heater ON: H
Sub heater ON: H
To DC-CPU
Fixing
relay
drive
circuit
To DC-PC
to DC-CPU
to DC-CPU
9-11
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