• Code: 012-905
• Description: Paper Remains at Compiler Tray Paper Sensor Control logic reports paper at the Compiler Tray Paper Sensor.
• Remedy: • Check paper on the Compiler Tray Paper Sensor. • Check for obstructions in the paper path.
  Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Actuate the Compiler Tray No Paper Sensor (PL 21.8). The display changes. Y↓N→Check the circuit of the Compiler Tray No Paper Sensor. Refer to Transmissive Sensor Procedure for troubleshooting procedure. Check the following: • Ensure that the connectors shown in the circuit diagrams are securely connected and that the wires are not damaged • Exit Motor Belt for wear or damage • Exit Pinch Rollers 1 and 2 for damage • Lower Exit Roller for wear or damage • Synchronous Belt for wear or damage If the above checks are OK, then replace the Compiler Tray No Paper Sensor (PL 21.8). If the problem continues, replace the Finisher PWB (PL 21.12).

• Code: 012-906
• Description: Paper at H-Transport Tray Exit Sensor Control logic reports paper at the H-Transport Tray Exit Sensor.
• Remedy: • Check paper on the H-Transport Exit Sensor. • Check for obstructions in the paper path. • Check the H-Transport Drive Motor Belt for wear or damage. • Check the Guides on the H-Transport Cover for damage, wear or faulty installation.
  Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Open the H-Transport Cover and actuate the H-Transport Entrance Sensor (PL 21.25). The display changes. Y↓N→Check the circuit of the H-Transport Entrance Sensor. Refer to Transmissive Sensor Procedure for troubleshooting procedure. Check the following: • Ensure that the connectors shown in the circuit diagrams are securely connected and that the wires are not damaged • H-Transport and Finisher for a docking failure • H-Transport Motor and its associated gears and belts for damage, contamination or misalignment If the above checks are OK, then replace the H-Transport Entrance Sensor (PL 21.25). If the problem persists, replace the Finisher PWB (PL 21.12).

• Code: 012-907
• Description: Paper at Top Tray Exit Sensor Control logic reports paper at the Top Tray Exit Sensor.
• Remedy: • Check paper on the Top Tray Exit Sensor. • Check for obstructions in the paper path.
  Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Actuate the Top Tray Exit Sensor (PL 21.11). The display changes. Y↓N→Check the circuit of the Top Tray Exit Sensor. Refer to Transmissive Sensor Procedure for troubleshooting procedure. Check the following: • Ensure that the connectors shown in the circuit diagrams are securely connected and that the wires are not damaged • Exit Motor Belt for wear or damage • Exit Drive Shaft Rolls for wear or damage • Exit Pinch Rollers for wear or damage • Synchronous Belt for wear or damage If the above checks are OK, then replace the Top Tray Exit Sensor (PL 21.11). If the problem continues, replace the Finisher PWB (PL 21.12).

• Code: 012-910
• Description: Staple Ready Sensor Fail Staple Ready Sensor is turned Off at stapling start.
• Remedy: Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Block/unblock the Stapler Ready Sensor (PL 21.6). The display changed. Y↓N→Check continuity between the Stapler Ready Sensor and Finisher PWB. The continuity check is OK. Y↓N→Repair the open circuit or short circuit. Replace the Stapler Ready Sensor (PL 21.6). If the problem continues, replace the Finisher PWB (PL 21.12). Check the following: • Wiring between the Staple Ready Sensor and the Finisher PWB • Wiring between the Staple Motor and the Finisher PWB • Obstructions on the Stapler Upper Rail • Stapler Move Motor Gear If the above checks are OK. replace the Finisher PWB (PL 21.12).

• Code: 012-916
• Description: Stapler NG The Staple Home Sensor has not switched from Off to On within the specified time after the Staple Motor started rotating forward. The Staple Head Home Sensor turned On within xxx msec. after the Staple Motor reversed.
• Remedy: • Check the Actuator for deformation. • Check the Staple Home Sensor for improper installation. • Check the Staple Home Sensor connectors for connection failure. • Check the Staple Guide for a foreign substance and deformation. • Check the Staple Motor for operation failure. • Check the Staple Motor connectors for connection failure.
  Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Perform the Staple Motor test alternately. The Staple Motor (PL 21.6) energizes. Y↓N→Check continuity between the Stapler Head and Finisher PWB. The continuity check is OK. Y↓N→Repair the open circuit or short circuit. Replace the Stapler Head (PL 21.6). If the problem continues, replace the Finisher PWB (PL 21.6). Actuate the Staple Home Sensor (PL 21.6). Perform the Staple Motor test (PL 21.6), alternately. The display changes. Y↓N→Check continuity between the Stapler Head and Finisher PWB. The continuity check is OK. Y↓N→Repair the open circuit or short circuit. Replace the Stapler Head (PL 21.6). If the problem continues, replace the Finisher PWB (PL 21.12). If the problem continues, replace the Finisher PWB (PL 21.12).

• Code: 012-920
• Description: Paper at Gate Sensor (Top Tray Job) Control logic reports paper at the Gate Sensor.
• Remedy: • Check for obstructions in the paper path. • Check the Finisher Drive Motor Gears and Drive rolls for wear or damage.
  Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Actuate the Gate Sensor (PL 21.11). The display changes. Y↓N→Check the circuit of the Gate Sensor.. Refer to Transmissive Sensor Procedure for troubleshooting procedure. Check the following: • Ensure that the connectors shown in the circuit diagrams are securely connected and that the wires are not damaged • Check the Finisher is docked properly • Check the Finisher Transport Motor and its associated gears and belts for damage, contamination or misalignment If the above checks are OK, then replace the Gate Sensor (PL 21.11). If the problem persists, replace the Finisher PWB (PL 21.12).

• Code: 012-921
• Description: Paper at Gate Sensor (Compiler Path Job) Control logic reports paper at the Gate Sensor.
• Remedy: • Check for obstructions in the paper path. • Check the Finisher Drive Motor Gears and Drive rolls for wear or damage.
  Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Actuate the Gate Sensor (PL 21.11). The display changes. Y↓N→Check the circuit of the Gate Sensor. Refer to Transmissive Sensor Procedure for troubleshooting procedure. Check the following: • Ensure that the connectors shown in the circuit diagrams are securely connected and that the wires are not damaged • Check the Finisher is docked properly • Check the Finisher Transport Motor and its associated gears and belts for damage, contamination or misalignment If the above checks are OK, then replace the Gate Sensor (PL 21.11). If the problem persists, replace the Finisher PWB (PL 21.12).

• Code: 012-922
• Description: Paper at Gate Sensor (Buffer Path Job) Control logic reports paper at the Gate Sensor.
• Remedy: • Check for obstructions in the paper path. • Check the Finisher Drive Motor Gears and Drive rolls for wear or damage.
  Enter Service Diagnostics Menu: Printer Menu > Troubleshooting > Service Tools > Printer Status Page > hold the Up and Down buttons simultaneously > Run Service Diagnostics > OK. Actuate the Gate Sensor (PL 21.11). The display changes. Y↓N→Check the circuit of the Gate Sensor.. Refer to Transmissive Sensor Procedure for troubleshooting procedure. Check the following: • Ensure that the connectors shown in the circuit diagrams are securely connected and that the wires are not damaged • Check the Finisher is docked properly • Check the Finisher Transport Motor and its associated gears and belts for damage, contamination or misalignment If the above checks are OK, then replace the Gate Sensor (PL 21.11). If the problem persists, replace the Finisher PWB (PL 21.12).