Causes: Lens unit SLG board Inverter Exposure lamp
Remedy: 1 Does the exposure lamp light? (Perform the output check: 03-267) Yes 2 No 3 2 CCD board SLG board • Check if the connectors on the CCD and SLG boards are disconnected. • Check if the shading correction plate is dirty. • Check if the conductor pattern on the CCD board is short circuited or open circuited. • Check if the conductor pattern on the SLG board is short circuited or open circuited. 3 Exposure lamp Inverter SLG board • Check if the connectors of the exposure lamp and inverter are disconnected. • Check the SLG board if the connector pin CN21 is disconnected or the harness is short circuited or open circuited. • Check if the conductor pattern on the SLG board is short circuited or open circuited.
Code: C270
Description: Carriage home position sensor not going OFF within a specified time / Downloading firmware with an incorrect model
Causes: SLG board
Remedy: 1 Are the carriages slightly moved to the feeding direction?/Are the carriages staying at a position other than home position? Yes Check if the circuits of the SLG board are abnormal. No 2 2 SLG board • Check if the connector pin is disconnected or the harness is short circuited or open circuited. • Check if the conductor pattern on the SLG board is short circuited or open circuited. • If the model of the firmware downloaded is incorrect, a C270 error (exposure lamp blinks twice) occurs. If the exposure lamp blinks twice, download the correct ROM.
Code: C280
Description: Carriage home position sensor not going ON within a specified time
Causes: Home position sensor SLG board
Remedy: dure Check item Result Measure Next Step 1 Do the carriages make a big noise after they arrive at the home position? Yes 2 No 3 2 Home position sensor SLG board The carriage home position sensor is not turned ON. • Check if the connector of the sensor is disconnected. • Check if the circuits of the SLG board are abnormal. 3 SLG board The carriages are stopped at the home position and do not move. • Check if the connector pins are disconnected or the harnesses are short circuited or open circuited. • Check if the conductor pattern on the SLG board is short circuited or open circuited.
Code: C290
Description: Scanner fuse blowout. The scanning system does not operate due to a blowout of the fuse in the scanning system.
Causes: Fuse in the scanning system SLG board
Remedy: 1 Power supply unit Check if any fuse in the scanning system is blown out. 2 SLG board Check if the conductor pattern on the SLG board is short circuited or open circuited. Check if the 24V output and the grounding wire are normal.
Code: C370
Description: Transfer belt motor abnormality
Causes: Transfer belt motor LGC board
Remedy: Transfer belt unit • Connector check (J578) • Check if the transport belt unit is working normally. Transfer belt motor Connector check LGC board Connector check (CN332) 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. 2 EPU • 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. 3 Auto toner sensor - Equipment Harness - LGC board • Check the connectors and harnesses between the auto toner sensor and LGC board (CN340). • Remove any foreign matter such as toner in the connector of the auto toner sensor.