Description: Scanner fuse blowout: 24V power for the scanning system is not supplied at the scanner warming-up after power-ON.
Causes: SYS board Fuse (F204) Power supply harness LVPS
Remedy: Is 24V supplied to the SYS board? Yes Check the following because the signal for checking 24V on the SYS board is abnormal. 1. Check if 3V is input in 35 Pin of the scanner CPU (IC301). 2. Check if the mounted parts on the SYS board are damaged or abnormal. 3. Check if 24V on the SYS board is short circuited. 4. Check if 24V is supplied to the SYS board (CN127). No 1. Check if the 24V supply harness is properly connected to the connector (CN127). 2. Check if 24V and SG on the SYS board are short circuited. 3. Check if the power supply is short circuited by pulling out the supply harness on the SYS board (CN127). 4. Check if the fuse on the LVPS (F204) is open circuited. 5. Check if there is no abnormality on the LVPS.
Code: C370
Description: Drum TBU motor abnormality
Causes: Drum TBU motor LGC board
Remedy: Transfer belt unit • Connector check (J1061, J1063) • Check if the transport belt unit is working normally. Drum TBU motor Connector check LGC board Connector check (CN388) Transfer belt Check if it’s normal Release detection sensor Sensor check
Causes: Auto toner sensor Harness LGC board Developer material
Remedy: 1 Developer unit • Check if the developer unit is installed properly. • Check that the developer unit and coupling on the equipment side are properly engaged. • Check that the mixer of the developer unit is rotated. • Check if the developer material is too dark visually. • Check if the amount of the developer material is too large or too small. • Remove any toner or dust on the ATC sensor connector and the drawer connector of the process cover. • Remove any toner or dust on the EPU sensor connector and the drawer connector on the equipment side. 2 Auto toner sensor - Equipment Harness - LGC board • Check the connectors and harnesses between the auto toner sensor and LGC board (CN365). • Remove any foreign matter such as toner in the connector of the auto toner sensor.
Causes: Auto toner sensor Harness LGC board Developer material
Remedy: 1 Developer unit • Check if the developer unit is installed properly. • Check that the developer unit and coupling on the equipment side are properly engaged. • Check that the mixer of the developer unit is rotated. • Check if the developer material is too light visually. • Check if the amount of the developer material is too large or too small. • Remove any toner or dust on the ATC sensor connector and the drawer connector of the process cover. • Remove any toner or dust on the EPU sensor connector and the drawer connector on the equipment side. 2 Auto toner sensor Harness LGC board • Check the connectors and harnesses between the auto toner sensor and LGC board (CN365). • Check if there is any foreign matter such as toner in the connector of the auto toner sensor. Remove if there is and reconnect it.
Causes: Auto toner sensor Harness LGC board Developer material
Remedy: 1 Developer unit • Check if the developer unit is installed properly. • Check that the developer unit and coupling on the equipment side are properly engaged. • Check that the mixer of the developer unit is rotated. • Check if the developer material is too dark visually. • Check if the amount of the developer material is too large or too small. • Remove any toner or dust on the ATC sensor connector and the drawer connector of the process cover. • Remove any toner or dust on the EPU sensor connector and the drawer connector on the equipment side. 2 Auto toner sensor Harness LGC board • Check the connectors and harnesses between the auto toner sensor and LGC board (CN365). • Check if there is any foreign matter such as toner in the connector of the auto toner sensor. Remove if there is and reconnect it.
Causes: Auto toner sensor Harness LGC board Developer material
Remedy: 1 Developer unit • Check if the developer unit is installed properly. • Check that the developer unit and coupling on the equipment side are properly engaged. • Check that the mixer of the developer unit is rotated. • Check if the developer material is too light visually. • Check if the amount of the developer material is too large or too small. • Remove any toner or dust on the ATC sensor connector and the drawer connector of the process cover. • Remove any toner or dust on the EPU sensor connector and the drawer connector on the equipment side.2 Auto toner sensor Harness LGC board • Check the connectors and harnesses between the auto toner sensor and LGC board (CN365). • Check if there is any foreign matter such as toner in the connector of the auto toner sensor. Remove if there is and reconnect it.