20-5.Mechanism And Control Of Fusing Roller Small-Amount Turning - Minolta Di450 Service Manual

H1
H2
TH1
TH2
20-5. Mechanism and Control of Fusing Roller Small-Amount
Turning
• If the Fusing Rollers remain stationary for more than 60 minute with the temperature con-
trol kept active, the areas of the two rollers in contact with each other are dented by heat
and pressure. To prevent this situation, the motor is automatically energized once in a
given period of time to turn the rollers 1/4 turns.
• The motor is energized once when the cumulative period of time counted, through which
the motor remains deenergized, reaches a predetermined value.
Motor Driven
Temperature Control ON
Fusing Roller
Temperature Control OFF
Fusing Motor
A + B = 55 minute
C: When the Front Door Interlock Switch is turned OFF and ON, or the Predrive OFF
Rear Sensor is deactivated and activated.
CONTROL SIGNAL
PWB-A PJ7A-8A
PWB-A PJ7A-11A
PWB-A PJ7A-9A
PWB-A PJ7A-12A
Warm-Up
ON
OFF
55 minute
M-74
ON OFF
L
L
Analog Input
Analog Input
Cumulative Period of Time Counted
55 minute
140 msecond
A
C
WIRING DIAGRAM
H 1 - A
H 1 - B
1 - B
1 - B
140 msecond
B
4002M572AA