Ricoh B022, Руководство по обслуживанию, Страница: 852 / 878

SERVICE CALL CONDITIONS
B022/B027 7-6 SM
Code No. Symptom Possible Cause
Paper tray error 520 B
An error occurs (i.e motor error, or
sensor error, etc) for any paper tray.
•
A defective motor
•
A defective sensor
•
Too much load on the drive
mechanism
Fusing thermistor open 541 A
The fusing temperature detected by the
thermistor was below 0
°
C for 5
seconds.
The fusing temperature does not rise
+15
°
C (center) or +12
°
C (at the ends)
five times within 2 minutes after the
fusing lamps have been turned on.
•
Fusing thermistor defective or out of
position
•
Fusing lamp open
•
Fusing thermostat open
•
Power supply board defective
•
Poor connection of the fusing unit
Fusing temperature warm-up error 542 A
The fusing temperature does not reach
the standby temperature within 20
seconds after the main switch is turned
on.
•
Fusing thermistor defective or out of
position
•
Fusing lamp open
•
Fusing thermostat open
•
Power supply board defective
•
Poor connection of the fusing unit
Fusing overheat error 1 543 A
A fusing temperature of over 231
°
C is
detected for 5 second by the fusing
thermistor.
•
Fusing thermistor defective
•
Power supply board defective
•
SBCU board defective
Fusing overheat error 2 544 A
A fusing temperature of over 251
°
C is
detected by the fusing temperature
monitor circuit in the SBCU board.
•
Fusing thermistor defective
•
Power supply board defective
•
SBCU board defective
Fusing lamp remains on 545 A
After reaching the Ready temperature
(stand-by temperature) during warm-up,
the fusing lamp remains at full power
for 10 seconds without the hot roller
rotating.
Thermistor is out of position.
Unstable fusing temperature 546 A
The fusing temperature varies 50
°
C or
more within 1 second twice
continuously.
•
Thermistor defective
•
Poor connection of the fusing unit
•
Power supply unit defective
Zero cross signal malfunction 547 B
Zero cross signals are not detected
within a certain period.
•
Power supply board defective
•
SBCU board defective
Fusing unit set error 548 A
The machine does not detect the fusing
unit.
•
Poor connection of the fusing unit
•
The fusing unit is not installed
Exhaust fan motor error 590 B
The CPU detects an exhaust fan lock
signal for more than 5 seconds.
•
Poor connection of the exhaust fan
motor
•
Too much load on the motor drive
Communication break error between
SBCU and ADF 611 B
The SBCU receives a break signal from
the ADF main board.
•
Serial line connecting SBCU and
ADF unstable
•
External noise
•
ADF main board defective
•
SBCU board defective
Rev. 01/2003