SC TABLES
31 March, 1999
7-4
SC
No.
Type
Name
Occurrence conditions
Detection conditions
Cause
42
Type 2
Laser diode
error
LD error (abnormal laser
power output)
LD, LD control
board
43
Type 2
Synchronizat
ion detection
error
Synchronization detection
error of the optical unit
During polygon mirror
motor revolution
Synchronization
detection board, LD
control board
45
Type 2
Charge bias
short
A/D converted voltage
has been 4.8 V or more
for 240 ms.
Detection starts 60
ms after control starts
for this component.
There is a short
circuit in the charge
bias supply circuit
(due to deformed
terminals or
electrodes or
conductive foreign
matter)
46
Type 2
Paper
transfer
positive
current error
A/D converted voltage
has been 0.2 V or less for
240 ms.
Detection starts 60
ms after control starts
for this component.
There is a short
circuit in the paper
transfer bias supply
circuit (due to
deformed terminals
or electrodes or
conductive foreign
matter)
47
Type 2
Paper
transfer
negative bias
open
The PWM duty has been
50% or greater for 240
ms.
Detection starts 60
ms after control starts
for this component.
There is
disconnection in the
paper transfer bias
supply circuit. (Dirty
or deformed
electrodes)
48
Type 2
Paper
transfer
negative
current error
A/D converted voltage
has been 4.8 V or more
for 240 ms.
Detection starts 60
ms after control starts
for this component.
There is a short
circuit in the paper
transfer bias supply
circuit (due to
deformed terminals
or electrodes or
conductive foreign
matter)
49
Type 1
Pressure
roller reheat
timeout
When reheating, the
roller temperature does
not reach the reheat start
temperature (target
temperature -20
°
C) within
five minutes.
During reheating
Pressure roller
thermistor, pressure
roller lamp
connector, MCU
50
Type 1
Hot roller
reheat
timeout
When reheating, the
roller temperature does
not reach the reheat start
temperature (target
temperature -10
°
C) within
five minutes.
During reheating
Hot roller thermistor,
hot roller lamp
connector, MCU
51
Type 1
Pressure
roller lamp
full-power
operation
error
When full-power
operation occurs during
reheating, the main motor
is not running and the
difference between the
current temperature and
that of 60 seconds ago is
18
°
C or less.
No detection in the
event of a jam/door
open, SC, unit
absence, energy-
saving mode, or
fusing unit absence.
Pressure roller
thermistor, pressure
roller lamp
connector, MCU
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