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Service Guide DOC-IT3000/4000
Chapter 2 Principles of Operation
2.4.06 Alarm Detection
At Power On
The inlet and outlet sensors are checked for their on and off states at power on time.
Inlet sensor on: Inlet jam error (Paper jam)
Outlet sensor on: Outlet jam error (Paper jam)
The thermistor sensor detects if the temperature of the fusing unit reaches the normal
temperature
within the specified time. When it does not reach the normal temperature within the specified time,
the thermistor sensor turns OFF the heater.
The fan sensor checks the rotation of the fan. When the fan is not in motion, it turns OFF of the
heater, and stops the fan.
When the paper cassette does not contain paper, and the power is turned ON, a sensor sends
no-paper information to the Control Unit (CU).
When the power supply is turned ON, the number of printed papers of the fusing unit and drum
cartridge is checked.
During Hopping Operations
Whenever the inlet sensor fails to detect paper within a predetermined period of time after a feed
command has been issued to the document table, a failure is counted. An inlet jam error (Paper
feed jam) is established.
During Paper Feeding Operations
If the leading part of the paper does not reach the outlet sensor within a predetermined period of
time after the start of feeding by the resist motor, a feed jam error is established.
During ADF Feeding
If the leading part of the paper does not reach the timing sensor within a predetermined period of
time after start of feeding by the resist motor, a feed jam error is established.
If the leading part of the paper does not reach the outlet sensor within a predetermined period of
time after the timing sensor is on, a feed jam error is established.
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Summary of Contents for DOC-IT3000
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