• Code: 377.602
• Description: Transparency Sensor Fault. An abnormal value was detected from the Transparency Sensor. (This is a hidden failure. Data is only recorded in history.)
• Remedy: Check the following: • The Transparency Sensor and Reflective Prism for contamination and improper installation • Use of Transparency out of spec (refer to the Media and Tray Specifications). • The Transparency Sensor for failure: dc140 Analog Monitor [077-200] (PL 15.2) • The connection between the Transparency Sensor P/J161 and the MD PWB P/J523 for open circuit, short circuit, and poor contact • The connector ( P/J452) between the MD PWB and the MCU PWB for poor connection If no problems are found, replace the following parts in sequence: • MD PWB • MCU PWB

• Code: 377.900
• Description: Reg Sensor Static Jam. When the power was turned On, the M/C was stopped (Cycle Down/ Shut Down), or when the interlocks were closed (all interlocks including options), the Reg Sensor detected paper.
• Remedy: Check the following: • The Reg Sensor for remaining paper, contamination, Actuator return failure, or improper installation • The Reg Sensor for failure: dc330 Component Control [077-103] (PL 15.2) • The connection between the Reg Sensor P/J160 and the MD PWB P/J523 for short circuit If no problems are found, replace the following parts in sequence: • MD PWB • MCU PWB

• Code: 377.901
• Description: Exit Sensor 1 Static Jam. When the power was turned On, the M/C was stopped (Cycle Down/ Shut Down), or when the interlocks were closed (all interlocks including options), the Fuser Exit Sensor detected paper.
• Remedy: Check the following: • The Fuser Exit Sensor for remaining paper, contamination, Actuator return failure, or improper installation • The Fuser Exit Sensor for failure: dc330 Component Control [077-101] (PL 7.1) • The connection between the Fuser Assembly DJ600 and the MCU PWB P/J431 for short circuit If no problems are found, replace the MCU PWB.

• Code: 377.902
• Description: Exit Sensor 2 Static Jam. When the power was turned On, the M/C was stopped (Cycle Down/ Shut Down), or when the interlocks were closed (all interlocks including options), the Exit 2 Sensor detected paper.
• Remedy: Check the following: • The Exit 2 Sensor for remaining paper, contamination, Actuator return failure, or improper installation • The Exit 2 Sensor for failure: dc330 Component Control [077-100] (PL 17.4) • The connection between the Exit 2 Sensor P/J164 and the MD PWB P/J522 for short circuit • The L/H High Cover Assembly for damage or mismatch If no problems are found, replace the following parts in sequence: • MD PWB • MCU PWB

• Code: 377.903
• Description: POB Sensor Static Jam. When the power was turned On, the M/C was stopped (Cycle Down/ Shut Down), or when the interlocks were closed (all interlocks including options), the POB Sensor detected paper.
• Remedy: Check the following: • The POB Sensor for remaining paper, contamination, or improper installation • The POB Sensor for failure: dc330 Component Control [077-102] (PL 14.4) • The connection between the POB Sensor P/J180 and the MD PWB P/J523 for short circuit If no problems are found, replace the following parts in sequence: • MD PWB • MCU PWB

• Code: 377.907
• Description: Duplex Wait Sensor Static Jam. When the power was turned On, the M/C was stopped (Cycle Down/ Shut Down), or when the interlocks were closed (all interlocks including options), the Duplex Wait Sensor detected paper.
• Remedy: Check the following: • The Duplex Wait Sensor for remaining paper, contamination, Actuator return failure, or improper installation • The Duplex Wait Sensor for failure: dc330 Component Control [077-108] (PL 14.5) • The connection between the Duplex Wait Sensor P/J175 and the MD PWB P/J523 for short circuit If no problems are found, replace the following parts in sequence: • MD PWB • MCU PWB

• Code: 378.210
• Description: Tray 4 (TTM) Lift Failure. After the Tray 4 Lift/Feed Motor turned on, the Tray 4 Level Sensor did not turn on within the specified time.
• Remedy: • Reload paper in the tray correctly. • Remove foreign substances in the tray. • Power Off/On
  Execute dc330 Component Control [073-004] Tray 4 Lift/Feed Motor On. The Tray 3 Lift/Feed Motor can be heard. Y↓ N→There is +24 VDC from P/J541 pin 10 on the Tray Module PWB to GND. Y↓ N→Refer to Option DC Power Distribution and the +24 VDC-4 Wirenet to troubleshoot the 24 VDC circuit. Turn Off the power. Remove the Tray 4 Lift/Feed Motor, then measure the following resistances. • Between P/J222 pin-1 and P/J222 pin-2 • Between P/J222 pin-3 and P/J222 pin-4 All resistances are approx. 4 Ohms at 25° C / 77° F. Y↓ N→Replace the Tray 4 Lift/Feed Motor (PL 11.9 Item 4). Check the wires between P/J222 on the Tray 4 Lift/Feed Motor and P/J550 on the Tray Module PWB for an open or shorted circuit, or a loose or damaged connector. The wires are OK. Y↓ N→Repair as required. Replace the Tray 4 Feed/Lift Motor (PL 11.9 Item 4). If the problem continues, replace the following in sequence: • Tray Module PWB • MD PWB • MCU PWB Check the installation of the Tray 4 Level Sensor (PL 11.9 Item 7) and the operation of the actuator. The Level Sensor is installed correctly and the actuator works. Y↓ N→Reinstall the Tray 4 Level Sensor (PL 11.9 Item 7). Execute DC330 [073-102], Tray 4 Level Sensor. Manually activate the Tray 4 Level Sensor (PL 11.9 Item 7). The display changes. Y↓ N→Check the wires between P/J111 on the Tray 4 Level Sensor and P/J548 on the Tray Module PWB for an open or shorted circuit, or a loose or damaged connector. The wires are OK. Y↓ N→Repair as required. Disconnect P/J548 on the Tray Module PWB. There is approx. +5VDC from P 548 pin 13 to GND. Y↓ N→Replace the Tray Module PWB. Reconnect P/J548. Monitor the voltage between P/J548-15 (+) and GND (-) while you activate the actuator of the Tray 4 Level Sensor. The voltage changes. Y↓ N→Replace the Tray 4 Level Sensor (PL 11.9 Item 7). Replace the following in sequence: • Tray Module PWB • MD PWB • MCU PWB Check the mechanical components of the lift mechanism for dirty or damaged gears, broken or out-of-place cables. If a problem is found replace the Tray 4 Assembly. If the check is good, replace the following in sequence: • Tray Module PWB • MD PWB • MCU PWB

• Code: 378.211
• Description: Tray 5 (TTM) Lift Failure. After the Tray 5 Lift/Feed Motor turned on, the Tray 5 Level Sensor did not turn on within the specified time.
• Remedy: Execute dc330 Component Control [074-004] Tray 5 Lift/Feed Motor On. The Tray 4 Lift/Feed Motor can be heard. Y↓ N→There is +24 VDC from - P/J541 pin 10 on the Tray Module PWB to GND. Y↓ N→Refer to Option DC Power Distribution and the +24 VDC-4 Wirenet to troubleshoot the 24 VDC circuit. Turn Off the power. Remove the Tray 5 Lift/Feed Motor, then measure the following resistances. • Between P/J223 pin-1 and P/J223 pin-2 • Between P/J223 pin-3 and P/J223 pin-4 All resistances are approx. 4 Ohms at 25° C / 77° F. Y↓ N→Replace the Tray 5 Lift/Feed Motor (PL 11.11 Item 4). Check the wires between P/J223 on the Tray 5 Lift/Feed Motor and P/J550 on the Tray Module PWB for an open or shorted circuit, or a loose or damaged connector. The wires are OK. Y↓ N→Repair as required. Replace the Tray 5 Feed/Lift Motor (PL 11.11 Item 4). If the problem continues, replace the following in sequence: • Tray Module PWB • MD PWB • MCU PWB Check the installation of the Tray 5 Level Sensor (PL 11.11 Item 7) and the operation of the actuator. The Level Sensor is installed correctly and the actuator works. Y↓ N→Reinstall the Tray 5 Level Sensor (PL 11.11 Item 7). Execute DC330 [074-102], Tray 5 Level Sensor. Manually activate the Tray 5 Level Sensor (PL 11.11 Item 7). The display changes. Y↓ N→Check the wires between P/J115 on the Tray 5 Level Sensor and P/J548 on the Tray Module PWB for an open or shorted circuit, or a loose or damaged connector. The wires are OK. Y↓ N→Repair as required. Disconnect P/J548 on the Tray Module PWB. There is approx. +5VDC from P 548 pin 4 to GND. Y↓ N→Replace the Tray Module PWB (PL 11.7). Reconnect P/J548. Monitor the voltage between P/J548-6 (+) and GND (-) while you activate the actuator of the Tray 5 Level Sensor. The voltage changes. Y↓ N→Replace the Tray 5 Level Sensor (PL 11.11 Item 7). Replace the following in sequence: • Tray Module PWB • MD PWB • MCU PWB Check the mechanical components of the lift mechanism for dirty or damaged gears, broken or out-of-place cables. If a problem is found replace the Tray 5 Assembly. If the check is good, replace the following in sequence: • Tray Module PWB (PL 11.7) • MD PWB • MCU PWB