Page: 33
Service Guide OL830
Chapter 2 Principles of Operation
2.3.10 Sensor Functions
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 supply jam)
Outlet sensor on: Outlet jam error (paper eject jam)
The thermistor sensor detects if the fuser temperature reaches the desired temperature within the
specified time. If the desired temperature is not reached, the fuser is turned OFF.
The fan sensor circuitry checks for the rotation of the fan. If fan motion is not detected, the fuser is
turned OFF, and power is removed from the fan.
When an empty paper cassette has been detected, the Paper-End Sensor sends the PAPER
END signal to the Control Unit.
When the power supply is turned ON, the number of printed pages of the fusing unit and drum
cartridge is checked. If the Fuser or Drum life has been exceeded, this information is transmitted
to the Control Unit.
Hopping
Whenever the inlet sensor fails to detect paper within a predetermined time after a feed command
has been issued to the paper supply system, the failure is counted. The hopping operation is then
attempted up to three times. If the hopping operation still fails, an
INLET JAM ERROR
is displayed
on the Operation Panel.
Feeding
If the leading part of the paper does not reach the outlet sensor within a predetermined time after
the start of feeding by the resist motor, a
FEED JAM ERROR
will be displayed on the Operation
Panel.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
