• Code: 542-03
• Description: Fusing lamp (Center) thermopile not reloaded 2
  The heater (Center) thermistor does not reach the reload temperature 44 seconds after the start of motor rotation.
• Causes: • Stained thermopile lens • Deformed or floating thermistor • Input voltage out of range • The overtemperature prevention mechanism started working
• Remedy: • Clear the SP: fusing SC. • Clean the thermopile lens. • Replace the thermopile.

• Code: 542-04
• Description: Fusing lamp (Center) thermopile not reloaded 3
  The heater (Center) thermistor does not reach 100 deg C 5.5 seconds after the start of heat control (during low-temperature start up control).
• Causes: • Stained thermopile lens • Deformed or floating thermistor • Input voltage out of range • The overtemperature prevention mechanism started working
• Remedy: • Clear the SP: fusing SC. • Clean the thermopile lens. • Replace the thermopile.

• Code: 543-00
• Description: Fusing (Center) thermopile high-temperature detected (software)
  The temperature is detected to stay at 230 deg C or higher for one second.
• Causes: • Shorted triac • Failed Engine Board
• Remedy: • Clear the SP: fusing SC. • Replace the PSU. • Replace the Engine Board.

• Code: 544-00
• Description: Fusing (Center) thermopile high-temperature detected (hardware)
  The hardware high-temperature error Sensor flag is detected at 10 ms intervals.
• Causes: • Damaged triac (shorted) • Failed engine control board • Failed fusing thermopile • Failed fusing thermistor • Abnormal fusing control software behavior • The PWM signal is continuously supplied from the IH inverter (due to a software or temperature Sensor error).
• Remedy: • Clear the SP: fusing SC. • Replace the PSU. • Replace the Engine Board. • Replace the fusing thermopile. • Replace the Fusing Unit.

• Code: 545-00
• Description: Fusing (Center) heater stay ON
  The fusing (Center) heater stays ON for 5.7 seconds or more when in stand-by state (or the fusing roller is not rotating).
• Causes: • Deformed or floating thermistor • Broken fusing lamp wire • The overtemperature prevention mechanism started working
• Remedy: • Clear the SP: fusing SC. • Clean the thermopile lens. • Replace the fusing thermopile. • Replace the fusing (Center) lamp.

• Code: 547-01
• Description: Zero-crossing error (adhered relay contact)
  When the fusing relay is in an OFF state, a "zero-crossing interrupt request" occurs in 50 ms.
• Causes: Damaged fusing relay (adhered contact)
• Remedy: • Turn the main power OFF and then ON. • Replace the harness. • Replace the PC board. • Replace the PSU.

• Code: 547-02
• Description: Zero-crossing error (bad relay contact)
  If a "zero-crossing interrupt request" does not occur when the fusing relay is in an ON state, an error results.
• Causes: - Damaged fusing relay (open contact) - Failed fusing relay drive circuit - PSU fuse (24VS) blown
• Remedy: • Turn the main power OFF and then ON. • Replace the harness. • Replace the Engine Board. • Replace the PSU. • Replace the fuse.

• Code: 547-03
• Description: Zero-crossing error (low frequency error)
  The number of zero-crossing interrupts does not reach a certain value in 500 ms.
• Causes: The frequency of the commercial power supply line is unstable.
• Remedy: • Turn the main power OFF and then ON. • Check the commercial power supply line. • Replace the harness. • Replace the Engine Board. • Replace the PSU.