• Code: SC551
• Description: Fusing thermistor open (end) The temperature of the hot roller remained below 0°C for 5 sec. at the end of the hot roller.
• Causes: • Fusing thermistor out of its position because of incorrect installation • Fusing thermistor disconnected or defective • Power supply not within rated range (15% or more below rating)
• Remedy: • Check the fusing thermistor is set correctly. • Replace the fusing thermistor. • Check the power supply source.

• Code: SC552-01
• Description: Fusing end thermopile does not reload Temperature gradient detection:Temperature rise of 2 seconds is detected by five consecutive four degrees or less
• Causes: • Fusing thermistor defective or out of position • Fusing thermistor modification/float • Outside input voltage guarantee
• Remedy: • Check the fusing thermistor is set correctly. • Replace the fusing thermistor. • Check that the input voltage is within acceptable limits • Replace the fusing unit • Repace the BCU

• Code: SC552-03
• Description: Fusing end thermopile does not reload • Time out (Non-rotating roller): Reload temperature not reached in 28 seconds after the fusing lamp control start • Time out (Rotating roller): Reload temperature not reached in 46 seconds after the fusing lamp control start
• Causes: • Disconnection of the fusing lamp • After excessive temperature rise prevention unit operation
• Remedy: • Check the fusing thermistor is set correctly. • Replace the fusing thermistor. • Check that the input voltage is within acceptable limits • Replace the fusing unit • Repace the BCU

• Code: SC553
• Description: Fusing overheat error 1 (end) The fusing thermistor detected a fusing temperature over 230°C for 1 sec. at the center of the hot roller.
• Causes: • TRIAC short on PSU (PSU defective) • BCU defective • Power supply voltage unstable
• Remedy: • Replace the PSU. • Replace the BCU. • Replace the fusing unit.

• Code: SC554
• Description: Fusing overheat error 2 (end) A fusing temperature over 250°C is detected at the center of the hot roller by the fusing temperature monitor circuit in the BCU board. The power was interrupted for more than 0.3 sec.
• Causes: • TRIAC short on PSU (PSU defective) • BCU defective • Fusing thermistor defective • Power supply voltage unstable
• Remedy: • Replace the PSU. • Replace the BCU. • Replace the fusing unit.

• Code: SC555
• Description: Fusing overheat error 3 (end) After warmup, the center of the hot roller attained full operating temperature and maintained this temperature for 29 sec. without the hot roller rotating.
• Causes: • Center hot roller thermistor installed incorrectly, disconnected. • Center hot roller thermistor defective
• Remedy: • Check the hot roller thermistor is set correctly. • Replace the hot roller thermistor. • Replace the BCU. • Check that the input voltage is within acceptable limits. • Replace the fusing unit. • Replace the fusing lamp in the case of disconnection.

• Code: SC557
• Description: Zero Cross Frequency Exceeded The waveform of the zero cross signal was detected out of range.
• Causes: Electrical noise on the power supply line
• Remedy: Check the power supply source.

• Code: SC559
• Description: Fusing Jam Detected for 3 Times Consecutively Consecutive fusing unit paper jams
• Causes: Three consecutive paper jams occurred in the fusing unit. The paper jam counter for the fusing unit reaches 3 times. The paper jam counter clears after the paper feeds correctly. Note: This SC is issued only if SP1159 is set to "1".
• Remedy: • Clean the fusing entrance/exit guides • Replace the fusing unit. • Replace the hot roller strippers