Code :

Code: 077-301
Description: <IOT Side Cover Open> Side Cover is open.
Causes: • Front Cover Sensor (PL18.1.45) • MCU Board (PL18.1.13)
Remedy: 1 Check the Front Cover Sensor operation Execute Digital Input diagnostic test 041-302, and check the Front Cover Sensor operation. Does it function normally? Replace the MCU Board. Go to step 2. 2 Check the Front Cover Sensor connection Check the connection between the Front Cover Sensor and the MCU Board. Are P/J145 and P/J14 connected securely? Go to step 3. Connect P/J145 and P/J14 securely. 3 Check the power to the Front Cover Sensor (+5 VDC) Check if the voltage between the MCU Board ground and the P/J14-9 pin is about +5 VDC. Replace the Front Cover Sensor.

Code: 077-304
Description: IOT Cover Rear Open Rear Cover Open
Causes: • Rear Interlock Switch (PL19.1.21) • LVPS (PL18.1.34)
Remedy: 1 Check the Rear Interlock Switch operation Execute Digital Input diagnostic test 041-301, and check the Rear Interlock Switch operation. Does it function normally? Replace the MCU Board. Go to step 2. 2 Check the Rear Interlock Switch connection Check the connection between the Rear Interlock Switch and the LVPS. Is P/J41 connected securely? Go to step 3. Connect P/J41 securely. 3 Check after replacing the Rear Interlock Switch Replace the Rear Interlock Switch. Does the error still occur? Replace the LVPS. Finished.

Code: 091-400
Description: IOT Waste Toner Box Near Life Detect Waste Toner Box Near Life
Causes: • Rear Interlock Switch (PL19.1.21) • LVPS (PL18.1.34)
Remedy: 1 Check the Rear Interlock Switch operation Execute Digital Input diagnostic test 041-301, and check the Rear Interlock Switch operation. Does it function normally? Replace the MCU Board. Go to step 2. 2 Check the Rear Interlock Switch connection Check the connection between the Rear Interlock Switch and the LVPS. Is P/J41 connected securely? Go to step 3. Connect P/J41 securely. 3 Check after replacing the Rear Interlock Switch Replace the Rear Interlock Switch. Does the error still occur? Replace the LVPS. Finished.

Code: 091-911
Description: IOT Waste Toner Box Life Over Detect Waste Toner Box Life Over
Causes: • Toner Full Sensor (PL4.1.17) • MCU Board (PL18.1.13)
Remedy: 1 Check the Toner Full Sensor operation Execute Digital Input diagnostic test 094-202, and check the Toner Full Sensor operation. Does it function normally? Replace the MCU Board. Go to step 2. 2 Check the Toner Full Sensor connection Check the connection between the Toner Full Sensor and the MCU Board. Are P/J203 and P/J29 connected securely? Go to step 3. Connect P/J203 and P/J29 securely. 3 Check the power to the Toner Full Sensor (+5 VDC) Check if the voltage between the MCU Board ground and the P/J29-20 pin is about +5 VDC. Replace the Toner Full Sensor.

Code: 091-914
Description: IOT K Drum Comm Fail Detect Black Drum Comm Fail
Causes: • Black Imaging Unit (PL8.1.5) • CRUM Connector Assembly (PL8.1.1) • MCU Board (PL18.1.13)
Remedy: 1 Check the Imaging Unit installation Is the connection part between the CRUM and the CRUM Connector Assembly inside the Black Imaging Unit clean (without any foreign objects)? And, is the Black Imaging Unit installed properly? Go to step 2. Reinstall the Black Imaging Unit. 2 Check the Imaging Unit CRUM Is the connection terminal of the CRUM inside the Black Imaging Unit broken? Replace the Black Imaging Unit. Go to step 3. 3 Check the CRUM Connector Assembly Is the connection terminal of the CRUM Connector Assembly broken? Replace the CRUM Connector Assembly. Go to step 4. 4 Check the CRUM Connector Assembly connection Check the connection between the CRUM Connector Assembly and the MCU Board. Are P/J124 and P/J12 connected securely? Go to step 5. Connect P/J124 and P/J12 securely. 5 Check the continuity between the CRUM Connector Assembly and the MCU Board Is each cable of P/J124<=>P/J12 continuous? Replace the MCU Board. Replace the CRUM Connector Assembly.

Code: 091-915
Description: DRUM UnitK CRUM Data Broken Fail Wrong data in CRUM of drum K
Causes: • Black Imaging Unit (PL8.1.5)
Remedy: 1 Check the Imaging Unit installation Is an Imaging Unit other than a Black Imaging Unit installed? Or, is the installed Imaging Unit for another printer? Install the right Black Imaging Unit. Reinstall the Black Imaging Unit.