• Code: J87
• Description: The Automatic Duplex Unit Sensor 4 detects no paper within a predetermined time after Automatic Duplex Unit Sensor 4 is ON.
• Causes:

• Code: J88
• Description: The Automatic Duplex Unit Sensor 1 detects paper when machine is standby.
• Causes:

• Code: J89
• Description: The Automatic Duplex Unit Sensor 2, 3 or 4 detects paper when machine is standby.
• Causes:

• Code: J90
• Description: A PRINT signal is not received within 1 minute after the FEED signal is received.
• Causes:

• Code: J91
• Description: A Paper Tray is pulled out when feeding a paper.
• Causes:

• Code: J92
• Description: A Front Door Cover is opened when feeding a paper.
• Causes:

• Code: U01
• Description: CLOSE FRONT/RIGHT COVER
• Causes: 1. Front/Right Cover is open. 2. Front Cover Sensor is disconnected. 3. Front Cover Sensor is defective. 4. LVPS connector is disconnected. 5. LVPS is defective. 6. LPC3 PCB connector is disconnected. 7. LPC3 PCB is defective.

• Code: U07
• Description: CLOSE FEED COVER
• Causes: 1. Feed Cover is open. 2. Feeder Unit is incorrectly installed. 3. Feeder Unit connector is disconnected. 4. Feeder Unit Sensor is disconnected. 5. Feeder Unit Sensor is defective. 6. LVPS connector is disconnected. 7. LVPS is defective. 8. CST4 PCB connector are disconnected. 9. CST4 PCB is defective.