Ricoh U-C1 B051 - Page 159

SERVICE CALL 26 July 2002
4-8
No.
Definition
Symptom Possible Cause
Low temperature error (heating roller) 544 A
During standby or operation, the
heating roller thermistor detects
100 °C or less for 5 seconds.
• Defective lamp (loose connection,
thermostat failure, PSU, thermostat)
• Incorrect detection (loose thermistor
connection, fusing - drawer loose
connection)
Full power error (heating roller) 545 A
Fusing unit warm-up is complete. →
The heating roller stops turning. →
The heating roller lamp keeps
outputting the maximum power for 30
seconds.
• Thermistor loose connection
• Fusing - drawer loose connection
Unstable temperature (heating roller) 546 A
The heating roller thermistor detects
unstable temperature increases or
decreases within 60 seconds.
• Thermistor loose connection
• Fusing - drawer loose connection
Thermistor disconnection (pressure roller) 551 A
The pressure roller thermistor detects
7°C or lower for 30 seconds.
• Thermistor loose connection
• Defective harness
• Defective connector
Warm-up time over (pressure roller) 552 A
The main switch is turned on or a
cover is closed. → The fusing
pressure roller does not reach the
ready temperature within 200
seconds.
• Defective lamp (loose connection,
thermostat failure, PSU, thermostat)
• Incorrect detection (thermistor loose
connection, fusing - drawer loose
connection)
Overheat error (pressure roller) 553 A
The pressure roller thermistor detects
165°C for 5 seconds.
• Loose connection
• Defective BICU board
• Defective PSU
Low temperature error (pressure roller) 554 A
During standby or operation, the
pressure roller thermistor detects
60°C or less for 5 seconds.
• Defective lamp (loose connection,
thermostat failure, PSU, thermostat)
• Incorrect detection (thermistor loose
connection, fusing - drawer loose
connection)
Full power error (pressure roller) 555 A
Fusing unit warm-up is complete.→
The fusing pressure roller stops
turning. → The pressure roller lamp
keeps outputting the maximum power
for 200 seconds.
• Thermistor loose connection
• Fusing - drawer loose connection
Unstable temperature (pressure roller) 556 A
The pressure roller thermistor detects
unstable temperature increases or
decreases within 60 seconds.
• Thermistor loose connection
• Fusing - drawer loose connection
Zero cross error 560 D
The main switch is turned on; the
fusing relay turns on. → 50 Hz or 60
Hz is not detected within 5 seconds.
• Defective PSU
• Incorrect power supply