Service Manual
Operating Principles
If the following conditions are detected, it will be judged that there is a fuser error (LCD displayed
“SERVICE REQ.
■
The warming-up period does not end within 150 sec.
■
The thermistor temperature drops to 122 degrees C.
The thermistor temperature exceeds 182 degrees C.
The thermostat cuts power if the temperature of the fusing section rises to an abnormally high level
(220 degrees C).
The thermostat fuse cuts power if the temperature of the fusing section rises toanabnormallyhigh
level (over 220 degrees C) and the thermostat did not move.
2.1.3.4 Scanner Motor Control
Figure 2-29 is the scanner motor control circuit. The scanner motor is driving, while the scanner
motor receives the SCANNER MOTOR ON signal.
and
are scanner motor
rotating speed setting signals. The printing resolution of this printer is 600
(dot per inch), then
is HIGH and
is LOW. In these settings, the scanner motor rotating speed is 8031 rpm.
Engine Controller Board
(MCU PWB)
SG
SCANNER MOTOR ON
RTN
ROS Unit
,------- ----------- . . . . . . . . . . . . . . . .
Scanner Assembly
~
- - -
8
:
9
Figure 2-29. Scanner
Motor
Motor Control
Rev.
2-17
