31 March, 1999
SC TABLES
7-3
Trouble-
shooting
SC
No.
Type
Name
Occurrence conditions
Detection conditions
Cause
29
Type 2
Primary
transfer bias
open
The PWM duty has been
50% or higher for 240
ms.
Detection starts 60
ms after control starts
for this component.
There is a
disconnection in the
primary transfer bias
supply circuit. (Dirty
or deformed
electrodes)
31
Type 2
Supply bias
error
The voltage has been
higher than the
appropriate control
voltage for the target
voltage for 240 ms.
However, detection is
disabled when the
calculated control voltage
is 5 V or higher.
Detection starts 60
ms after control starts
for this component.
There is a short
circuit in the supply
bias supply circuit
(due to deformed
terminals or
electrodes or
conductive foreign
matter)
32
Type 2
Blade bias
error
The voltage has been
higher than the
appropriate control
voltage for the target
voltage for 240 ms.
However, detection is
disabled when the
calculated control voltage
is 5 V or higher.
Detection starts 60
ms after control starts
for this component.
There is a short
circuit in the blade
bias supply circuit.
33
Type 2
Charge
corona unit
bias open
The PWM duty has been
50% or higher for 240
ms.
Detection starts 60
ms after control starts
for this component.
There is
disconnection in the
charge corona unit
bias supply circuit.
(Dirty or deformed
electrodes)
34
Type 2
Charge
corona unit
grid bias
error
The voltage has been
higher than the
appropriate control
voltage for the target
voltage for 240 ms.
However, detection is
disabled when the
calculated control voltage
is 5 V or higher.
Detection starts 60
ms after control starts
for this component.
There is a short
circuit in the charge
corona unit grid bias
supply circuit (due
to deformed
terminals or
electrodes or
conductive foreign
matters).
35
Type 2
Main motor
error
Continuous unlock for
two seconds
Main motor, MCU
36
Type 2
PCU motor
error
Continuous unlock for
two seconds
PCU motor, MCU
38
Type 2
Revolver
motor error
Movement to the home
position took four or more
seconds. For black,
movement to the home
position took one second
or longer.
Revolver motor,
MCU, or incorrect
installation of color
development unit
39
Type 2
Polygon
mirror motor
error
Continuous unlock for
two seconds
Polygon mirror
motor, MCU
40
Type 2
ID sensor
error
The ID sensor output
voltage is not between
0.1 V and 1.1 V while the
ID sensor LED is off.
ID sensor calibration
ID sensor
41
Type 2
Transfer belt
H.P. sensor
error
No mark has been
detected for 500 ms
during PCU motor
operation.
Transfer belt H.P.
sensor, MCU
