Motor Error Rotation Detection Circuit - Canon NP6251 Service Manual

Sub
thermistor
100/120V
TH2
TH1
H1
Main thermistor
220/240V
H1

4. Motor Error Rotation Detection Circuit

The motor error rotation detection circuit checks for an error (suspension of rotation)
in relation to the scanner motor (M3), RDF belt motor, and scanner original leading edge
sensor 2 (PS4).
In response to the motor error OFF detection signal (ENCODER ERROR), the gate
array resets the DC controller PCB.
RDF
M3
M3
drive
circuit
To RDF
COPYRIGHT © 1997 CANON INC.
Download service manual and resetter printer at http://printer1.blogspot.com
AC
driver
PCB
Main
Sub
H2
AC
driver
PCB
Figure 6-111
M3
M3
drive
circuit
Detection
circuit
PS4
Figure 6-112
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 FIXING SYSTEM
Main heater ON
Sub heater ON
SSR ON
Gate
SSR
array
ACTIVE
Overheating
detected
FUSER
TEMP
Overheating
ERROR
open circuit Timer
detection
+12V
Power supply
switch OFF
DC controller PCB
DC controller PCB
Gate
array
ENCODER
ERROR
Resetting
Resetting
IC
Error
Master
CPU
Master
CPU
6-17