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3: Operation
3-102
Colorwriter LSR 2000 Printer
Service Guide
•
When the power is turned on, a fixing unit error is found stored
in the DC controller.
•
Sixty seconds after the power is turned on, the value of the fixing
temperature detect signal (THI) sent to the CPU on the DC
controller has not changed.
•
After the fixing heater is turned on, any of the following
phenomena occur:
•
The temperature of the fixing heater does not reach 40
°
C
even after 130 seconds have elapsed.
•
The temperature of the fixing heater does not reach 60
°
C
even after 80 seconds have elapsed since it reached 40
°
C.
•
The temperature of the fixing heater does not reach 80
°
C
even after 80 seconds have elapsed since it reached 60
°
C.
•
The temperature of the fixing heater does not reach 100
°
C
even after 80 seconds have elapsed since it reached 80
°
C.
•
The temperature of the fixing heater does not reach 120
°
C
even after 80 seconds have elapsed since it reached 100
°
C.
•
The temperature of the fixing heater does not reach the
target value even after 160 seconds have elapsed since it
reached 120
°
C.
•
The temperature of the fixing heater decreases below 120
°
C
after it reaches the target value once.
•
The temperature of the fixing heater exceeds 200
°
C during the
STANDBY or PRINT period. (The fixing heater malfunctions).
•
When the THI signals are compared after changing the
sensitivity of the thermistor from the high range to the low
range, there is almost no difference recognized (the wiring for
the thermistor is broken).
Notes:
•
If a malfunction occurs in the fixing heater, do not turn on the
printer power switch for about 30 minutes. Even if the power
switch is turned on during this time period, the CPU assesses
that a fixing heater malfunction has occurred and the fixing
heater will not be turned on to prevent it from overheating.
•
OFF time measurement
The off-timer circuit on the DC controller PCB can measure
the elapse of time after the power is turned off. The measured
time is used to release fixing unit errors and the environment-
change correction control.