Service manual

SC Tables
SM 6-7 D127/D128
Trouble –
shooting
No.
Definition
Symptom Possible Cause
302 B
High-voltage charge error
The maximum rate of PWM duty
(50%) occurs ten times in series
(20msec x 10)
This error doesn’t happen when the
front door (the inter lock) opens.
 Defective the MD
 Defective harness connected to
the HVP
355 D
P sensor error
SC350~354 happen on normal
operation. This error isn't displayed
on panel but left on the history as a
logging data.
 Disconnection of the harness to
P sensor
 Bad electrical contact of P
sensor CN
 Defective the BICU
 Defective the writing section
 Defective developer density
 Defective high-voltage PP
 Uncleanness of the P sensor
 Defective the P sensor
389 D
T sensor error warning
Detected the following value
T sensor output value < 0.2V
T sensor output value > 4.0V
10 times in series.
 Defective the T sensor
 Bad contact of the connector to
the T sensor
390 B
T sensor error
After SC389 detection and
executing SP2-992-001, This SC is
displayed.
In process flow, This SC occurs
when two times of T sensor output
value error are detected
consecutively.
 Defective T sensor
 Loose connection part