![Canon NP6251 Service Manual Download Page 325](http://html.mh-extra.com/html/canon/np6251/np6251_service-manual_59699325.webp)
Figure 6-111
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.
Figure 6-112
RDF
DC controller PCB
M3
M3
M3
drive
circuit
M3
drive
circuit
PS4
To RDF
Detection
circuit
Gate
array
Resetting
IC
Master
CPU
ENCODER
ERROR
Resetting
Error
DC controller PCB
Gate
array
Overheating
detected
H1
H1
H2
TH1
TH2
Master
CPU
AC
driver
PCB
AC
driver
PCB
Timer
Main heater ON
Sub heater ON
Main
Sub
SSR ON
SSR
ACTIVE
FUSER
TEMP
ERROR
100/120V
220/240V
Power supply
switch OFF
Overheating
open circuit
detection
+12V
Sub
thermistor
Main thermistor
COPYRIGHT © 1997 CANON INC. CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 6 FIXING SYSTEM
6-17