Ricoh SPC430DN

• Code: 545
• Description: Heating roller fusing lamp consecutive full power 1
  When the fusing unit is not running in the ready condition, the heating roller fusing lamp keeps on full power for 30 seconds.
• Causes: • Broken heating roller thermostat • Broken heating roller fusing lamp
• Remedy: 1. Replace the heating roller thermostat. 2. Replace the heating roller fusing lamp.

• Code: 547
• Description: Zero cross error
  • The zero cross signal is detected for 0.05 seconds three times even though the heater relay is off when turning on the main power. • The zero cross signal is not detected for 3 seconds even though the heater relay is on after turning on the main power or closing the front door. • The detection error occurs twice or more in the 11 zero cross signal detections. This error is defined when the detected zero cross signal is less than 45.
• Causes: • Defective fusing lamp relay • Defective fusing lamp relay circuit • Unstable power supply
• Remedy: 1. Check the power supply source. 2. Replace the shorted 24V fuse on the PSU. 3. Replace the PSU

• Code: 551
• Description: Heating roller thermistor (end) error 2
  The temperature measured by the heating roller thermistor (end) does not reach 0° C for 6 seconds.
• Causes: • Loose connection of heating roller thermistor (end) • Defective heating roller thermistor (end)
• Remedy: 1. Check that the heating roller thermistor (end) is firmly connected. 2. Replace the heating roller thermistor (end).

• Code: 552
• Description: Heating roller warm-up error 2
  The heating roller temperature does not reach the ready temperature while 70 seconds after the heating lamp on.
• Causes: • Dirty or defective thermistor (end) • Heating roller fusing lamp broken • Defected thermostat • Defective heating roller fusing lampamp on.
• Remedy: 1. Check if the heating roller thermistor (end) is firmly connected. 2. Replace the heating roller thermistor (end). 3. Replace the heating roller fusing lamp.

• Code: 553
• Description: Heating roller fusing lamp overheat 2 (software error)
  The detected pressure roller temperature stays at 230°C or more for 1 second.
• Causes: • Defective PSU • Defective BCU
• Remedy: 1. Replace the heating roller thermistor (end). 2. Replace the PSU. 3. Replace the BCU.

• Code: 554
• Description: Heating roller fusing lamp overheat 2 (hardware error)
  The heating roller thermistor (end) detects 250°C or more.
• Causes: • Defective heating roller thermistor (end) • Defective PSU • Defective BCU • Defective fusing control system
• Remedy: 1. Replace the heating roller thermistor (end). 2. Replace the PSU. 3. Replace the BCU.