Error Detection Circuit; Outline - Canon NP6330 Service Manual

CHAPTER 7 CONTROLS AND EXTERNALS
III. ERROR DETECTION CIRCUIT
A. Outline
The copier's power switch (SW1) is equipped with a relay which turns on in response
to the following to cut off the AC power to the DC power supply PCB:
Error in the scanning lamp
Error in the fixing heater
Reference:
The relay will also turn on to turn off the power switch when the copier is not
operated for a specific period of time set in user mode.
FU1
LA1
TSW1
TH1
H2
H1
7-6
COPYRIGHT © 1997 CANON INC.
Download Service Manual And Resetter Printer at http://printer1.blogspot.com
Lamp ON (LMPON)
Lamp
Lamp ON detection (LDT)
regulator
Power switch OFF (PWOFF*)
SW1
Fixing main heater ON detection (MSSRD)
Fixing sub heater ON detection (SSSRD)
SSR
Fixing main heater ON (MHRD)
Fixing sub heater ON (SHRD)
Figure 7-301
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
+24VB
Gate
array
(IC115)
+5V
Comparator
circuit
Fixing heater
Master
temperature
CPU
error
(IC116)
DC controller PCB
I/O
port
(IC109)