Ricoh A-C4 - Page 210

20 June 2005 SERVICE CALL CONDITIONS
4-9
Trouble-
shooting
LCT tray malfunction
1) One of the following has occurred:
2) The LCT lift sensor does not activate for more than 18 seconds after the LCT
lift motor turned on.
3) The LCT lower limit sensor does not activate for more than 18 seconds after
the LCT lift motor turned on.
4) The LCT lift sensor is already activated when the LCT lift motor turns on.
5) 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.
6) The 4) state has been detected 3 times in succession.
510 B
• LCT lift motor defective or disconnected.
• Upper limit sensor defective or disconnected
• Pick-up solenoid defective or disconnected
• Paper end sensor defective
Fusing/Feed-Out Motor Error 520 D
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
B003/B006 (35 cpm)]/14 seconds [for
the B004/B007 (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
Fusing overheat error (hardware circuit
detection)
544 A
The dual monitoring circuitry of the
BICU detects extremely high
temperature and tripped the relay
circuit off.
• Power supply unit defective
• I/O board (IOB) defective
• BICU defective
• Fusing thermistor defective