SC TABLES
31 March, 1999
7-2
7.1.2 SC ERROR LIST
SC
No.
Type
Name
Occurrence conditions
Detection conditions
Cause
20
Type 2
Optional tray
unit error
The detection signal for
the 500 sheet paper tray
unit is abnormal.
Always monitored
The optional tray
unit connector has a
bad connection.
21
Type 1
Pressure
roller
thermistor
error
The roller temperature
has been at 0
°
C for five
seconds.
No detection in the
event of a jam/door
open, SC, unit
absence, energy-
saving mode, or lack
of fusing unit
Pressure roller
thermistor, MCU
22
Type 1
High
pressure
roller
temperature
The roller temperature
has been at 190
°
C or
higher for three seconds.
No detection in the
event of SC or lack of
fusing unit
Pressure roller
thermistor, MCU
23
Type 1
Low
pressure
roller
temperature
Reheating has been done
and the motor is not
running, or 60 seconds
have passed after the
main motor halted. Then,
the roller temperature has
been below 130ºC for 60
seconds
No detection in the
event of a jam/door
open, SC, unit
absence, energy-
saving mode, or lack
of fusing unit
Pressure roller
thermistor, MCU,
pressure roller lamp
connector
24
Type 1
Hot roller
thermistor
error
The roller temperature
has been 0
°
C for five
seconds.
No detection in the
event of a jam/door
open, SC, unit
absence, energy-
saving mode, or lack
of fusing unit
Hot roller thermistor,
MCU
25
Type 1
High hot
roller
temperature
The roller temperature
has been 190
°
C or higher
for three seconds.
No detection in the
event of SC or fusing
unit absence
Hot roller thermistor,
MCU
26
Type 1
Low hot
roller
temperature
Reheat has been done
and the motor is not
running, or 60 seconds
have passed after main
motor halt. Then, the
roller temperature has
been below 130ºC for 60
seconds
No detection in the
event of a jam/door
open, SC, unit
absence, energy-
saving mode, or
fusing unit absence
Hot roller thermistor,
MCU, hot roller
lamp connector
28
Type 2
Paper
transfer
positive bias
release error
The PWM duty has been
50% or higher for 240
ms. Or, the paper transfer
roller clutch does not
operate.
Detection starts 60
ms after control starts
for this component.
There is a
disconnection in the
paper transfer bias
supply circuit.
(Deformation of
terminals or springs,
dirty bearings)
When the
contact/separation
lever is normal: Bad
transfer roller
position sensor,
harness, or MCU
When the
contact/separation
lever is faulty: Bad
transfer roller clutch
or MCU
