• Code: 077-300
• Description: IOT Front Cover Open RAP The IOT Front Cover is open.
• Remedy: Check the opening/closing of the IOT Front Cover. The Front Cover can be opened/closed. Y↓N→Reinstall the Front Cover. Check the installation of the Front Cover Interlock Switch. The Front Cover Interlock Switch is installed correctly. Y↓N→Install the Front Cover Interlock Switch correctly. Execute Component Control [071-303 Front Cover Interlock Switch]. Open/close the IOT Front Cover. The display changes. Y↓N→Check the connections of P/J121 and P/J405. P/J121 and P/J405 are connected correctly. Y↓N→Connect P/J121 and P/J405. Check the wire between J405 and J121 for an open circuit or a short circuit. The wire between J405 and J121 is conducting without an open circuit or a short circuit. Y↓N→Repair the open circuit or short circuit. Check the conductivity of the Front Cover Interlock Switch (PL 10.1) between J405-3 and J405-4. The wire between J405-3 and J405-4 is connecting successfully when the Front Cover is closed, and is insulated when the cover is open. Y↓N→Replace the Front Cover Interlock Switch (PL 10.1). Replace the MCU PWB (PL 9.1). Replace the MCU PWB (PL 9.1).

• Code: 077-301
• Description: Left Hand Interlock Open RAP The L/H Cover Assembly is open.
• Remedy: Check opening/closing of the L/H Cover Assembly. The L/H Cover Assembly can be opened/closed. Y↓N→Reinstall the L/H Cover Assembly (PL 2.6). Check the installation of the L/H Cover Interlock Switch. The L/H Cover Interlock Switch is installed correctly. Y↓N→Install the L/H Cover Interlock Switch correctly. Execute Component Control [071-300 L/H Cover Interlock Switch]. Open and close the L/H Cover Assembly. The display changes. Y↓N→Check the connections of P/J120 and P/J405. P/J120 and P/J405 are connected correctly. Y↓N→Connect P/J120 and P/J405. Check the wire between J405 and J120 for an open circuit or a short circuit. The wire between J405 and J120 is conducting without an open circuit or a short circuit. Y↓N→Repair the open circuit or short circuit. Check the conductivity of the L/H Cover Interlock Switch (PL 2.6) between J405-1 and J405-2. The wire between J405-1 and J405-2 is connecting successfully when the L/H Cover Assembly is closed, and is insulated when the cover is open. Y↓N→Replace the L/H Cover Interlock Switch (PL 2.6). Measure the voltage between the MCU PWB P405-2 (+) and GND (-). The voltage is approx. +24VDC. Y↓N→Measure the voltage between the MCU PWB P400-1 (+) and GND (-). The voltage is approx. +24VDC. Y↓N→Check the connections of P/J526 and P/J400. P/J526 and P/J400 are connected correctly. Y↓N→Connect P/J526 and P/J400. Check the wire between J526 and J400 for an open circuit or a short circuit. The wire between J526 and J400 is conducting without an open circuit or a short circuit. Y↓N→Repair the open circuit or short circuit. Check the connections of P/J521, P/J523 and P/J300, P/J301. P/J521, P/ J523 and P/J300, P/J301 are connected correctly. Y↓N→Connect P/J521, P/J523 and P/J300, P/J301. Check the wire between J521, J523 and J300, J301 for an open circuit or a short circuit. The wire between J521, J523 and J300, J301 are conducting without an open circuit or a short circuit. Y↓N→Repair the open circuit or short circuit. Measure the voltage between the ESS PWB P301-3 (+) and GND (-). The voltage is approx. +5VDC. Y↓N→Replace the ESS PWB (PL 9.2). Replace the Power Unit (PL 9.1). Replace the MCU PWB (PL 9.1). Replace the MCU PWB (PL 9.1). Replace the MCU PWB (PL 9.1).

• Code: 077-305
• Description: Tray Module Left Hand Cover Interlock Open RAP • The 2TM Cover is open. • The TTM Cover is open.
• Remedy: Check opening/closing of the Left Cover of the 2TM or TTM. The Left Cover of the 2TM or TTM can be opened/closed. Y↓N→Reinstall the Left Cover of the 2TM or TTM (PL 12.4/PL 13.7). Check the installation of the Tray Module Interlock Switch. The Tray Module interlock Switch is installed correctly. Y↓N→Install the Tray Module interlock Switch (PL 12.4/PL 13.7) correctly. Execute Component Control [071-301 Tray Module Left Cover Interlock Switch]. Open and close the Left Cover of the 2TM or TTM. The display changes. Y↓N→Check the connections of P/J554, FS812 and FS813. P/J554, FS812 and FS813 are connected correctly. Y↓N→Connect P/J554, FS812 and FS813. Check the wire between J554-2 and FS812, and between J554-1 and FS813 for an open circuit or a short circuit. The wires between J554-2 and FS812, and between J554-1 and FS813 are conducting without an open circuit or a short circuit. Y↓N→Repair the open circuit or short circuit. Check the conductivity of the Tray Module Left Cover Interlock Switch (PL 12.4/PL 13.7) between FS813 and FS812. The wire between FS813 and FS812 is connecting successfully when the 2TM Cover or TTM Cover is closed, and is insulated when the cover is open. Y↓N→Replace the Tray Module Left Cover Interlock Switch (PL 12.4/PL 13.7). Replace the Tray Module PWB (PL 12.6/PL 13.8). Replace the Tray Module PWB (PL 12.6/PL 13.8).

• Code: 077-307
• Description: DUP Cover Open RAP The DUP Cover is open.
• Remedy: Check opening/closing of the DUP Cover. The DUP Cover can be opened/closed. Y↓N→Reinstall the DUP Cover. Check the installation of the Duplex Open Switch (PL 8.1). The Duplex Open Switch is installed correctly. Y↓N→Install the Duplex Open Switch (PL 8.1) correctly. Execute Component Control [071-305 Duplex Open Switch]. Open and close the DUP Cover. The display changes. Y↓N→Check the connections of P/J124 and P/J541. P/J124 and P/J541 are connected correctly. Y↓N→Connect P/J124 and P/J541. Check the wire between J124 and J541 for an open circuit or a short circuit. The wire between J124 and J541 is conducting without an open circuit or a short circuit. Y↓N→Repair the open circuit or short circuit. Check the conductivity of the Duplex Open Switch (PL 8.1) between J541-4 and J541-5. The wire between J541-4 and J541-5 is connecting successfully when the DUP Cover is closed, and is insulated when the cover is open. Y↓N→Replace the Duplex Open Switch (PL 8.1). Replace the MCU PWB (PL 9.1). Replace the MCU PWB (PL 9.1).

• Code: 077-308
• Description: Left Hand HIGH Interlock Open RAP The L/H-H Cover is open.
• Remedy: Check opening/closing of the IOT L/H-H Cover. The IOT L/H-H Cover can be opened/ closed. Y↓N→Reinstall the IOT L/H-H Cover. Check the installation of the Exit 2 Interlock Switch. The Exit 2 Interlock Switch is installed correctly. Y↓N→Install the Exit 2 Interlock Switch correctly. Execute Component Control [071-304 Exit 2 Interlock Switch]. Open/close the IOT L/H-H Cover. The display changes. Y↓N→Check the connections of P/J434, P/J116, P606, J606 and SJ1. The P/J434, P/J116, P606, J606 and SJ1 are connected correctly. Y↓N→Connect P/J434, P/J116, P606, J606 and SJ1. Check the wire between J434 and J116 for an open circuit or a short circuit. The wire between J434 and J116 is conducting without an open circuit or a short circuit. Y↓N→Repair the open circuit or short circuit. Check the conductivity of the Exit 2 Interlock Switch (PL 6.4) between J434-12 and J434- 13. The wire between J434-12 and J434-13 is connecting successfully when the IOT L/H-H Cover is closed, and is insulated when the cover is open. Y↓N→Replace the Exit 2 Interlock Switch (PL 6.4). Replace the MCU PWB (PL 9.1). Replace the MCU PWB (PL 9.1).

• Code: 077-309
• Description: Left Hand Low Interlock Open RAP The L/H Lower Cover is open.
• Remedy: Check opening/closing of the L/H Lower Cover. The L/H Lower Cover can be opened/ closed. Y↓N→Reinstall the L/H Lower Cover (PL 2.5). Check the installation of the L/H Lower Cover Interlock Switch. The L/H Lower Cover Interlock Switch is installed correctly. Y↓N→Install the L/H Lower Cover Interlock Switch (PL 2.5) correctly. Execute Component Control [071-302 L/H Lower Cover Interlock Switch]. Open/close the L/H Lower Cover. The display changes. Y↓N→Check the connections of P/J106 and P/J410. P/J106 and P/J410 are connected correctly. Y↓N→Connect P/J106 and P/J410. Check the wire between J106 and J410 for an open circuit or a short circuit. The wire between J106 and J410 is conducting without an open circuit or a short circuit. Y↓N→Repair the open circuit or short circuit. Check the conductivity of the L/H Lower Cover Interlock Switch (PL 2.5) between J410-11 and J410-12. The wire between J410-11 and J410-12 is connecting successfully when the L/H Lower Cover is closed, and is insulated when the cover is open. Y↓N→Replace the L/H Lower Cover Interlock Switch (PL 2.5). Replace the MCU PWB (PL 9.1). Replace the MCU PWB (PL 9.1).

• Code: 077-310
• Description: Controller Failed to send image RAP The MCU PWB did not receive the ESS PWB image-ready signal within the specified time.
• Remedy: Check the ROM version by executing NVM[740-007 ROM Version]. The ROM is the latest version. Y↓N→Replace the ROM with the latest version. Replace the MCU PWB (PL 9.1). If the problem persists, replace the ESS PWB (PL 9.2).

• Code: 077-329
• Description: Main Motor Stop Error RAP Due to MCU PWB control failure, the Main Motor does not stop when no paper is being fed.
• Remedy: Check the ROM version by executing NVM [740-007 ROM Version]. The ROM is the latest version. Y↓N→Replace the ROM with the latest version. Replace the MCU PWB (PL 9.1).