Ricoh B051 Service Manual page 179

No.
Definition
504 B 4th tray error
• 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.
515 D Duplex unit communication error
• 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.
520 D Fusing unit motor
• 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.
521 D Paper feed motor error
• 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.
541 A Thermistor disconnection (heating roller)
The fusing unit starts warm up to the
print ready temperature. → The
temperature does not reach 7°C for
10 seconds.
542 A Fusing warm-up timeout (heating roller)
The main switch is turned on or a
cover is closed. → The heating roller
does not reach the warm-up
temperature within 50 seconds.
543 A Overheat error (heating roller)
The heating roller thermistor detects
220°C for 5 seconds.
SM
CÓPIA NÃO CONTROLADA
Symptom
4-7
CÓPIA NÃO CONTROLADA
Possible Cause
• Defective paper height sensor
• Defective tray lift motor
• Defective duplex unit board
• Defective BICU
• Defective Ex-IOB
• Defective connection (Main unit -
Duplex unit)
• Defective fusing unit motor
• Defective paper feed motor
• Defective thermistor
• Thermistor loose connection
• Defective connector
• Defective lamp (loose connection,
thermostat failure, PSU, thermostat)
• Incorrect detection (loose thermistor
connection, fusing - drawer loose
connection)
• Short circuit
• Defective BICU board
• Defective PSU
SERVICE CALL
B051/B052