• Code: 557
• Description: Zero cross waveform signal error
  The waveform of the zero cross signal was detected out of range.
• Causes: • Electrical noise on the power supply line

• Code: 559
• Description: Consecutive fusing unit paper jams
  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".
• Causes: • Remove the paper jam in the fusing unit. • Make sure that the paper path in the fusing unit is clear.

• Code: 590
• Description: Exhaust fan motor error
  The CPU detects an exhaust fan lock signal for more than 3.5 seconds.
• Causes: • Poor connection of the exhaust fan motor • Too much load on the motor drive

• Code: 620
• Description: Communication error between IPU and ADF
  A break occurred in the connection between the IPU and ADF
• Causes: • ADF disconnected • ADF defective • IPU harness connection loose, broken • IPU defective • External noise

• Code: 621
• Description: Communication timeout between BCU and finisher
  A break (LOW) signal was received from the finisher.
• Causes: • Finisher serial cable connection loose, broken • BCU defective • Finisher main board defective • External noise

• Code: 632
• Description: Key/card counter device error 1
  After 1 data frame is sent to the device, an ACK signal is not received within 100 ms, and is not received after 3 retries.
• Causes: • Serial line from the device to the main machine is unstable, disconnected, or defective

• Code: 633
• Description: Key/card counter device error 2
  During communication with the device, the MCU received a break (Low) signal.
• Causes: • Serial line from the device to the main machine is unstable, disconnected, or defective

• Code: 634
• Description: Key/card counter device error 3
  The backup battery of the counter device RAM is low.
• Causes: • RAM backup battery exhausted • Counter device defective