• Code: SC506
• Description: By-pass feed table upper limit detection error • When the by-pass feed table upper limit is not detected after 6.5 seconds or more from the by-pass feed table lift motor starts lift up.
• Causes: • Defective by-pass table upper limit sensor • Dirty by-pass table upper limit sensor • Defective by-pass lift motor • Defective I/O control board
• Remedy: 1. Make sure that sensor harness is properly connected. 2. Clean sensor, replace it if neccesary. 3. Replace by-pass lift motor. 4. Replace I/O control board

• Code: SC507
• Description: By-pass feed table lower limit detection error • When the by-pass feed table lower limit is not detected after 6.5 seconds or more from the by-pass feed table lift motor starts lift down.
• Causes: • Defective by-pass table lower limit sensor • Dirty by-pass table lower limit sensor • Defective by-pass lift motor • Defective I/O control board
• Remedy: 1. Make sure that sensor harness is properly connected. 2. Clean sensor, replace it if necessary. 3. Replace by-pass lift motor. 4. Replace I/O control board.

• Code: SC510
• Description: Paper feed motor error - Timing & Condition - • The feedback signal from the motor is still out of range 1 second after the trigger signal was sent. • The feedback signal goes out of range for 2 seconds while the trigger signal is ON.
• Causes: • Poor connections • Defective paper feed motor • Defective I/O control board • Defective main control board • Mechanical overload
• Remedy: 1. Make sure it is properly connected to the I/O control board (CN230). 2. Replace the paper feed motor. (Output check: SP5-804-008 to 009) 3. Replace the I/O control board. 4. Replace the main control board. 5. Check the feed unit drive section for anything that might cause an overload. [Signal Check] • Motor OK: CN230-A1 or TP269 on the I/O control board

• Code: SC522
• Description: Duplex side fence jogger-- H.P. error - Timing & Condition - • The home position is still detected a few seconds after the side fence leaves the home position. • The home position is not detected 12 seconds after the side fence moves back into the home position.
• Causes: • Duplex unit not installed properly • Excessive load • Poor connections • Defective side fence motor • Defective I/O control board
• Remedy: 1. Pull out and re-insert the duplex unit. 2. Check that connector CN488 is properly connected to the duplex control board. 3. Check for anything that might cause the motor to overload. 4. Replace the side fence motor (Output Check: SP5-804 093 and 094). 5. Replace the I/O control board. [Signal Check] • Duplex Side Fence H.P.: CN207-B6 or TP293 on the I/O control board

• Code: SC524
• Description: Duplex end fence jogger-- H.P. error - Timing & Condition - • The home position is still detected a few seconds after the end fence leaves the home position. • The home position is not detected 24 seconds after the end fence moves back into the home position.
• Causes: • Duplex unit not installed properly • Excessive load • Poor connections • Defective end fence motor • Defective I/O control board
• Remedy: 1. Pull out and re-insert the duplex unit. 2. Check that connector CN484 is properly connected to the duplex control board. 3. Check for anything that might cause the motor to overload. 4. Replace the end fence motor (Output Check: SP5-804 095 and 096). 5. Replace the I/O control board. [Signal Check] • Duplex End Fence H.P.: CN207-B7 or TP288 on the I/O control board

• Code: SC541
• Description: Hot roller thermistor open - Timing - Checked second when the fusing unit is installed - Condition - The hot roller thermistor output is approximately 5V (0°C) for 6 seconds in a row.
• Causes: • Fusing unit not installed properly • Poor connections • Defective thermistor • Defective I/O control board • Defective main control board
• Remedy: 1. Make sure the fusing unit is properly installed. 2. Make sure the thermistor is properly connected. 3. Replace the thermistor if it is deformed. 4. Measure the thermistor’s resistance. If it is open, replace it. (Refer to the attached Temperature/ Resistance Conversion Reference Table.) 5. Replace the I/O control board. 6. Replace the main control board. [Signal Check] • Thermistor: CN214-A4, TP234, or CN211- B1 on I/O control board/CN302-B9 or TP117 on the main control board.

• Code: SC542
• Description: Hot roller warmup error - Timing & Condition - The hot roller thermistor does not register the ready temperature within 12 minutes of the main switch being turned on.
• Causes: • Poor connections • Blown hot roller fusing lamp • Opened hot roller thermofuse • Power fluctuations • Defective main control board • Defective I/O control board • Defective AC drive board
• Remedy: 1. Make sure the following are properly connected: • Hot roller fusing lamp • CN303 on the main control board • CN212 and CN229 on the I/O control board • CN7 on the AC drive board 2. Replace the hot roller fusing lamp if it is blown. 3. Replace the hot roller thermofuse if it is opened. 4. Check for power fluctuations from the outlet. 5. Test the main control board, I/O control board, or AC drive board by checking the trigger signal at each pin. [Signal Check] • Hot roller fusing trigger: CN303-B6 on main control board/CN212-B6, TP248, or CN229-5 on the I/O control board/CN7-6 on the AC drive board.

• Code: SC543
• Description: Overheating hot roller fusing lamp - Timing - Checked once a second when the fusing lamp is installed. - Condition - The hot roller thermistor output is lower than 0.3V (220°C) for 3 seconds in a row.
• Causes: • Fusing unit not installed properly • Poor connections • Defective thermistor • Defective I/O control board • Defective main control board • Defective AC drive board
• Remedy: 1. Make sure the fusing unit is installed properly. 2. Make sure the thermistor is properly connected. 3. Replace the thermistor if it is deformed. 4. Measure the thermistor’s resistance. If it is open, replace it. (Refer to the attached Temperature/ Resistance Conversion Reference Table.) 5. Test the main control board, I/O control board, or AC drive board by checking output from the thermistor and the trigger signal at each pin. [Signal Check] • Thermistor: CN214-A4, TP234, or CN211- B1 on the I/O control board/CN302-B9 or TP117 on the main control board. • Hot roller fusing trigger: CN303-B6 on the main control board/CN212-B6, TP248, or CN229-5 on the I/O control board/CN7-6 on the AC drive board.