Ricoh B022, Руководство по обслуживанию, Страница: 831 / 878

SERVICE CALL CONDITIONS
B022/B027 7-4 SM
Code No. Symptom Possible Cause
Laser synchronization error 322 B
The main scan synchronization detector
board cannot detect the laser
synchronization signal for more than 10
consecutive 50 ms intervals.
•
Poor connection between the laser
synchronization detector board and
the SBCU board
•
Laser synchronization detector board
out of position
•
Laser synchronization detector board
defective
•
SBCU board defective
•
LD unit defective
LD drive current over 323 B
The LD drive board applies more than
100 mA to the LD.
•
LD unit defective (not enough power,
due to aging)
•
Poor connection between the LD unit
and the SBCU board
•
SBCU board defective
ID sensor error
355 C
The ID sensor detects one of the
following conditions:
•
Vsg
≤
2.5V
•
Vsg < 3.5V when the maximum
power level (256) is applied.
•
Vsp
≥
2.5V
•
(Vsg – Vsp) < 1.0V
•
The ID sensor power level required
to achieve standard output reaches
the maximum (256).
•
ID sensor defective
•
ID sensor harness damaged
•
Poor ID sensor connection
•
SBCU board defective
•
High voltage supply board defective
TD sensor error 390 D
The TD sensor outputs less than 0.5V
or more than 4.0V 10 times
consecutively during copying.
•
TD sensor abnormal
•
Poor connection of the PCU
Development bias leak 391 B
A development bias leak signal is
detected.
•
Poor connection of the PCU
•
High voltage supply board defective
TD sensor initial setting error 392 B
TD sensor output voltage falls out of the
adjustment range (2.0
±<>
0.2 V) after
the TD sensor initial setting has been
finished.
•
Someone forgot to remove the toner
seal of the PCU
•
ID sensor defective
•
TD sensor abnormal
•
Drum does not turn
•
Development roller does not turn
•
Poor connection of the PCU
401 B Transfer roller leak error 1
Transfer roller leak error 2 402 B
A transfer roller current leak signal is
detected.
The current feedback signal for the
transfer roller is not detected.
•
High voltage supply board defective
•
Poor connection of the PCU
•
Transfer/separation unit set
incorrectly
•
Transfer roller damaged
Separation bias leak error 411 B
A separation bias leak signal is
detected.
•
High voltage supply board defective
•
Poor connection of the PCU
•
Discharge plate defective
Toner supply motor leak error 490 B
Over 1 A supplied to the toner supply
motor for longer than 200 ms.
Toner supply motor defective
⇒
Rev. 11/2002