Ricoh Aficio AP-4510 G065, Service Manual, Page: 146 / 278

SERVICE CALL CONDITIONS
G065 4-8 SM
SC Level Symptom Possible Cause
Fusing temperature warm-up error 542 A
•
Fusing temperature does not
reach fusing standby temperature
of 45
°
C (113
°
F) within 14 s at
main power on or closing the front
cover.
•
20 seconds after reaching 50
°
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
Fusing temperature of over 230
°
C
(446
°
F) is detected for 5 s by the
fusing thermistors at center or either
end of the fusing roller.
•
Power supply unit defective
•
I/O board (IOB) defective
•
BICU defective
•
Fusing thermistor defective
Fusing overheat error (hardware
circuit detection) 544 A
Dual-monitor circuitry of the BICU
detects an extremely high
temperature of 240
°
C (464
°
F) and
trips the relay circuit off.
•
Power supply unit defective
•
I/O board (IOB) defective
•
BICU defective
•
Fusing thermistor defective
Fusing lamp remains on 545 A
After reaching warm-up temperature
with main motor on, the end fusing
lamp remains on at full power for 15
s, or the center fusing lamp remains
on at full power for 10s
•
Thermistor out of position.
Fusing ready temperature unstable 546 A
After reaching warm-up temperature,
temperature fluctuations of 50
°
C
(122
°
F) within 1 s occur 2 times or
more.
•
Thermistor connection loose
•
Fusing unit connector loose
Zero cross signal malfunction 547 B
The applied power supply ac
frequency detection is over 66 Hz or
below 45 Hz, and the zero cross
signals are not detected within 500
ms after the main power on.
•
Power supply board defective
•
Noise on the ac power line
Fusing unit installation error 548 A
The machine cannot detect the
fusing unit when the front cover and
right cover are closed.
•
Fusing unit is not installed, or is
installed incorrectly
•
Fusing unit connection loose
C
OMMUNICATION AND
C
ONTROL
Communication timeout error
between BICU and finisher or
mailbox 620 C
The BICU does not receive a
response after 3 attempts within 100
ms to send data to the finisher or
mailbox.
•
Serial line connecting BICU and
finisher unstable
•
External noise
•
BICU board and finisher main
board connection defective or
loose
•
Finisher main board defective
•
BICU board defective
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA