Ricoh B079, Service Manual

Page: 206 / 948

SERVICE CALL CONDITIONS
B079/B082 4-8 SM
Code No. Symptom Possible Cause
LCT tray malfunction 510 C
1) The LCT lift sensor does not
activate for more than 18
seconds after the LCT lift motor
turned on.
2) The LCT lower limit sensor does
not activate for more than 18
seconds after the LCT lift motor
turned on.
3) The LCT lift sensor is already
activated when the LCT lift
motor turns on.
4) After the paper end sensor is
actuated while the tray is
raising, the upper limit sensor is
not actuated within 5 s. A
message is displayed to remind
the user to set the paper and
tray control halts. Resetting the
display is done by opening and
closing the LCT door.
5) The 4) state has been detected
3 times in succession.
LCT lift motor defective or
disconnected.
Upper limit sensor defective or
disconnected
Pick-up solenoid defective or
disconnected
Paper end sensor defective
520 Fusing/Feed-Out Motor Error C
The PLL lock signal remains LOW for 2
s while the feed development motor is
operating. Motor lock caused by overload.
Motor driver defective.
Fusing thermistor open 541 A
The fusing temperature detected by the
thermistor was below 7
°
C (44.6
o
F) for 5
seconds, or 2 seconds after reaching
45
o
C (113
o
F) the temperature does not
reach an additional 15
o
C (59
o
F) after
checking five times at 0.1 intervals.
Fusing thermistor disconnected
Fusing thermistor connector defective
Fusing thermistor damaged or warped
Fusing temperature –15% less than the
standard input voltage
Fusing temperature warm-up error 542 A
The fusing temperature does not reach
the fusing standby temperature of 45
o
C
(113
o
F) within 9 seconds for the B079
(35 cpm) 14 seconds for the B082 (45
cpm) after switching on the main power
or closing the front cover, or 40
seconds after reaching 50
o
C the fusing
roller does not reach warm-up
temperature.
Fusing lamp defective
Poor fusing unit connector
Thermistor warped or broken
Thermostat has tripped
BICU defective
Power supply board defective
Fusing overheat error (software
detection) 543 A
A fusing temperature of over 230 ° C
(446
o
F) is detected for 5 seconds by the
fusing thermistors at the center or at
either end of the fusing roller.
Power supply unit defective
I/O board (IOB) defective
BICU defective
Fusing thermistor defective