• Code: CH
• Description: LAMP "CH" ON. Cabinet open/close detection switch trouble DETAIL 1) Cabinet (operation unit) open/close detection switch malfunction 2) Cabinet (operation unit) open/close detection switch signal is not recognized.
• Remedy: Cabinet (operation unit) open/close detection switch signal recognition error 1) Cabinet (operation unit) open/close detection switch trouble 2) MCU PWB cabinet (operation unit) open/close detection switch signal input circuit trouble REMEDY (Check) 1) Cabinet (operation unit) open/close detection switch 2) MCU PWB cabinet (operation unit) open/close detection switch signal input circuit (Remedy) 1) Cabinet (operation unit) open/close detection switch replacement 2) MCU PWB replacement 3) Power PWB replacement (After work) 1) When the MCU PWB is replaced, perform simulations to input various set values and adjustment values. TROUBLE POSITION CAUSE Cabinet (operation unit) open/close detection switch actuator does not operate while the cabinet is opened/closed. 1) Cabinet (operation unit) open/close trouble REMEDY (Check) 1) Cabinet (Operation unit) (Remedy) 1) Cabinet (operation unit) replacement

• Code: CH
• Description: LAMP "CH" blink. Developer cartridge detection trouble DETAIL 1) Toner density sensor malfunction 2) Toner density sensor signal recognition error
• Remedy: Toner density sensor signal recognition error 1) Toner density sensor trouble 2) Toner density sensor signal input circuit trouble REMEDY (Check) 1) Toner density sensor 2) Toner density sensor signal input circuit (Remedy) 1) Toner density sensor replacement 2) PCU PWB Replacement (After work) 1) When the MCU PWB is replaced, perform simulations to input various set values and adjustment values.

• Code: E1
• Description: "P" blink. Paper misfeed DETAIL 1) Paper entry detection (PIN) malfunction 2) Paper entry detector (PIN) signal recognition error 3) Paper feed roller abnormal rotation
• Remedy: Paper entry detector (PIN) signal recognition error 1) Paper entry (PIN) trouble 2) Paper entry detector (PIN) signal input circuit trouble REMEDY (Check) 1) Paper entry detector (PIN) 2) MCU PWB paper entry detector (PIN) signal input circuit (Remedy) 1) Paper entry detector (PIN) replacement 2) MCU PWB replacement (After work) 1) When the MCU PWB is replaced, perform simulations to input various set values and adjustment values. TROUBLE POSITION CAUSE Paper feed roller does not feed paper normally. 1) Paper feed roller clutch drive circuit trouble 2) Paper feed roller clutch trouble 3) Paper feed roller trouble 4) Paper separation sheet trouble REMEDY (Check) 1) MCU PWB paper feed roller clutch drive circuit 2) Paper feed roller clutch 3) Paper feed roller 4) Paper separation sheet (Remedy) 1) MCU PWB replacement 2) Paper feed roller clutch replacement 3) Paper feed roller replacement 4) Paper separation sheet replacement

• Code: E2
• Description: LAMP Paper jam lamp blinking. Paper jam (paper entry section) DETAIL 1) Paper entry detector (PIN) malfunction 2) Paper entry detector (PIN) signal recognition error
• Remedy: Paper entry detector (PIN) signal recognition error 1) Paper entry detector (PIN) trouble 2) Paper entry detector (PIN) signal input circuit trouble REMEDY (Check) 1) Paper entry detector (PIN) 2) MCU PWB paper entry detector (PIN) signal input circuit (Remedy) 1) Paper entry detector (PIN) replacement 2) MCU PWB replacement (After work) 1) When the MCU PWB is replaced, perform simulations to input various set values and adjustment values.

• Code: E3
• Description: LAMP Paper jam lam blinking. Paper jam (fusing, paper exit section) DETAIL 1) Paper exit detector (POUT) malfunction 2) Paper exit detector (POUT) signal recognition error
• Remedy: Paper exit detector (POUT) signal recognition error 1) Paper exit detector (POUT) trouble 2) Paper exit detector (POUT) signal input circuit trouble REMEDY (Check) 1) Paper exit detector (POUT) 2) MCU PWB paper exit detector (POUT) signal input circuit (Remedy) 1) Paper exit detector (POUT) replacement 2) MCU PWB replacement (After work) 1) When the MCU PWB is replaced, perform simulations to input various set values and adjustment values.

• Code: E7-03
• Description: Laser beam output trouble. DETAIL 1) Laser beams are not outputted. 2) Laser beams are not recognized.
• Remedy: TROUBLE POSITION CAUSE Laser beam sensor signal recognition error 1) Laser beam sensor trouble 2) MCU PWB laser beam sensor input circuit trouble REMEDY (Check) 1) Laser beam sensor 2) MCU PWB laser beam sensor input circuit (Remedy) 1) Laser beam sensor replacement 2) The MCU PWB replacement (After work) 1) When the MCU PWB is replaced, perform simulations to input various set values and adjustment values. TROUBLE POSITION CAUSE The scanner (writing) optical system does not reflect and converge laser beams normally. 1) Scanner (writing) optical system dirt 2) Scanner (writing) optical system parts installation position shift REMEDY (Check) 1) Scanner (writing) optical system dirt 2) Scanner (writing) optical system parts installing position shift (Remedy) 1) Scanner (writing) optical system cleaning 2) Scanner (writing) optical system cleaning.

• Code: E7-04
• Description: Shading correction (white level) trouble DETAIL 1) Abnormal white level output during shading correction 2) The white level output is not recognized properly during shading correction.
• Remedy: The scanner (reading) optical system does not transmit images (light) normally. 1) Scanner (reading) optical system dirt 2) Scanner (reading) optical parts installing position shift REMEDY (Check) 1) Scanner (reading) optical system dirt 2) Scanner (reading) optical parts installing position (CCD unit, lens, mirror, copy lamp, copy lamp light quantity sensor, shading correction sheet) (Remedy) 1) Scanner (reading) optical system cleaning 2) Scanner (reading) optical parts installing position adjustment (CCD unit, lens, mirror, copy lamp, copy lamp light quantity sensor shading correction sheet) (After work) 1) Copy density adjustment. TROUBLE POSITION CAUSE Shading correction white level output recognition error 1) CCD unit trouble 2) MCU PWB image signal (CCD) input circuit trouble REMEDY (Check) 1) CCD unit output 2) MCU PWB image signal input circuit (Remedy) 1) CCD unit replacement 2) MCU PWB replacement (After work) 1) When the MCU PWB is replaced, perform simulations to input various set values and adjustment values. TROUBLE POSITION CAUSE Copy lamp light quantity abnormality 1) Copy lamp trouble 2) Copy lamp control PWB trouble 3) Copy lamp light quantity adjustment trouble REMEDY (Check) 1) Copy lamp 2) Copy lamp control PWB 3) Copy lamp light quantity level (Remedy) 1) Copy lamp replacement 2) Copy lamp control PWB replacement 3) Copy lamp light quantity level adjustment (After work) 1) Copy density adjustment.

• Code: E7-05
• Description: Shading correction (dark component) trouble DETAIL 1) Dark component level output is abnormal during shading correction. 2) Dark component level output is not recognized normally during shading correction.
• Remedy: TROUBLE POSITION CAUSE Scanner (reading) optical system does not transmit images (light) normally. 1) Scanner (reading) optical parts installing position shift REMEDY (Check) 1) Scanner (reading) optical parts installing position (CCD unit, lens, mirror, copy lamp, copy lamp light quantity sensor, shading correction sheet) (Remedy) 1) Scanner (reading) optical parts installing position adjustment (CCD unit, lens, mirror, copy lamp, copy lamp light quantity sensor, shading correction sheet) (After work) 1) Copy density adjustment. TROUBLE POSITION CAUSE Dark component output level recognition error during shading correction 1) CCD unit trouble 2) MCU PWB image signal (CCD) input circuit trouble REMEDY (Check) 1) CCD unit output 2) MCU PWB image signal (CCD) input circuit (Remedy) 1) CCD unit replacement 2) MCU PWB replacement (After work) 1) When the MCU PWB is replaced, perform simulations to input various set values and adjustment values. 2) When the CCD unit is replaced, adjust. TROUBLE POSITION CAUSE Copy lamp light quantity abnormality 1) Copy lamp trouble 2) Copy lamp control PWB rouble 3) Copy lamp light quantity adjustment trouble REMEDY (Check) 1) Copy lamp 2) Copy lamp control PWB 3) Copy lamp light quantity level (Remedy) 1) Copy lamp replacement 2) Copy lamp control PWB replacement 3) Copy lamp light quantity level adjustment (After work) 1) Copy density adjustment.