26 July 2002 SERVICE CALL
4-7
Trouble-
shooting
No.
Definition
Symptom Possible Cause
4th tray error 504 B
• The tray lift motor turns on. → The
top of the paper stack is not
detected for 18 seconds.
• The tray is set. → The top of the
paper stack is detected. → The
bottom plate is lowered. → The
stack detection is not cleared within
7 seconds. → These steps are
repeated 4 times.
• Defective paper height sensor
• Defective tray lift motor
Duplex unit communication error 515 D
• A connection error occurs.
• The signal is sent from the copier to
the duplex unit every 3 seconds
while paper is not transported by
the unit. However, the duplex unit
does not respond within 5 seconds.
• Defective duplex unit board
• Defective BICU
• Defective Ex-IOB
• Defective connection (Main unit -
Duplex unit)
Fusing unit motor 520 D
• The motor starts or changes speed.
→ The lock signal does not
continue for 1 second within a 3-
second interval.
• The motor starts. → The lock signal
is detected and operation proceeds
normally. → The lock signal is
interrupted for 1 second.
• Defective fusing unit motor
Paper feed motor error 521 D
• The motor starts or changes speed.
→ The lock signal does not
continue for 1 second within a 3-
second interval.
• The motor starts. → The lock signal
is detected and operation proceeds
normally. → The lock signal is
interrupted for 1 second.
• Defective paper feed motor
Thermistor disconnection (heating roller) 541 A
The fusing unit starts warm up to the
print ready temperature. → The
temperature does not reach 7°C for
10 seconds.
• Defective thermistor
• Thermistor loose connection
• Defective connector
Fusing warm-up timeout (heating roller) 542 A
The main switch is turned on or a
cover is closed. → The heating roller
does not reach the warm-up
temperature within 50 seconds.
• Defective lamp (loose connection,
thermostat failure, PSU, thermostat)
• Incorrect detection (loose thermistor
connection, fusing - drawer loose
connection)
Overheat error (heating roller) 543 A
The heating roller thermistor detects
220°C for 5 seconds.
• Short circuit
• Defective BICU board
• Defective PSU
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