• Code: C830
• Description: Original length detection sensor adjustment error: The original length detection sensor cannot be adjusted normally when the code 05-356 is performed.
• Remedy: (1) Check if there is any foreign matter between the original length detection sensor and reflecting mirror. Check if the reflecting mirror is dirty. (2) Check if the harness connecting the original length detection sensor and the ADF board is open circuited. (3) Check the circuits and connectors on the ADF board, mainly IC6, IC11 and CN15, for short circuits and open circuits. (4) Replace the original length detection sensor. (5) Replace the ADF board.

• Code: C840
• Description: Small original reverse sensor adjustment error: The small original reverse sensor cannot be adjusted normally when the code 05-356 is performed.
• Remedy: Is there any extraneous material between the small original reverse sensor and reflective mirror? → YES . Remove the extraneous material. NO Is the reflective mirror tainted? → YES . Clean up the mirror. NO Is the conductor pattern around IC6, IC11 and CN16 on the ADF board short- or open-circuited? → YES . Replace the ADF board. NO Replace the small original reverse sensor.

• Code: C850
• Description: Tray lift motor abnormality
• Remedy: Is the lifting tray lifted when originals are set on the feeding tray? ↓ → NO . Is the loading of the lifting tray normal? l → NO . Adjust the mechanical loading. Remove, if any, extraneous materials. YES Is the power voltage for CN5-5 and CN6 on the ADF board 24V? → NO . Replace the ADF board. YES Replace the lifting tray motor. YES Is the lifting tray upper limit detection sensor working properly when the lifting tray is lifted? → NO . Replace the lifting tray upper limit detection sensor. YES Is the lifting tray lowered when originals are removed from the original tray? ↓ → NO . ↓ → NO . Is the loading of the lifting tray abnormal, adjust the mechanical loading. Remove, if any, extraneous materials. YES YES 1) Replace the lifting tray lower limit detection sensor. 2) Replace the ADF board.

• Code: C860
• Description: Large original exit sensor adjustment error: The large original exit sensor cannot be adjusted normally when the code 05-356 is performed.
• Remedy: Is there any extraneous material between the large original exit sensor and reflective mirror? → YES . Remove the extraneous material. NO Is the reflective mirror tainted? → YES . Clean up the mirror. NO Is the conductor pattern around IC6, IC11 and CN11 on the ADF board short circuited or open circuited? ll → YES . 1) Replace the ADF board. 2) Perform the sensor automatical adjustment of ADF and tray width sensor adjustment. NO 1) Replace the large original exit sensor. 2) Perform the sensor automatical adjustment of ADF

• Code: C870
• Description: Temperature detection error
• Remedy: Check if the conductor pattern around thermistor(TH1) on the ADF board is not short circuited or open circuited. Replace the ADF board.

• Code: C940
• Description: Engine-CPU abnormality
• Remedy: Is the “Call for Service” displayed even after the power is turned OFF and back ON? → NO → Leave it and see what happens. YES 1) Check if the circuit pattern between the Engine-CPU and FROM is short circuited or open circuited. 2) Replace the LGC board if this error occurs frequently.

• Code: C970
• Description: High-voltage transformer leakage abnormality: The high-voltage leakage of the main charger is detected.
• Remedy: (1) Is the main charger installed securely? (2) Check if the spring of high-voltage supply contact point is deformed. (3) Check if the main charger wire is broken or the main charger grid is deformed. (4) Check if any foreign matters is on the main charger win or the main charger grid. (5) Replace the High-voltage transformer. (6) Replace the LGC board.

• Code: CA10
• Description: Polygonal motor abnormality: The polygonal motor does not run normally.
• Remedy: Is the polygonal motor rotating? ↓ → NO. (e-STUDIO520,e-STUDIO600,e-STUDIO720) 1) Check if the connector CN209 on the PLG board is disconnected. 2) Check if the harness is open circuited and the connector pin is disconnected. 3) Check if the following signals are transmitted on the pins of the connector CN209 on the PLG board. Pin 1: 27±1V, Pin 2: GND, Pin 3: Less than or equal to 1V (Lo), Pin 4: Less than or equal to 0.7 V (Lo), Pin 5: Do not touch. 4) Check if the conductor pattern on the PLG board is short circuited or open circuited. 5) Replace the laser optical unit. 6) Replace the PLG board. (e-STUDIO850) 1) Check if the connector CN206 on the PLG board is disconnected. 2) Check if the harness is open circuited and the connector pin is disconnected. 3) Check if the following signals are transmitted on the pins of the connector CN206 on the PLG board. Pin 1: 27±1V, Pin 2: GND, Pin 3: Less than or equal to 1V (Lo), Pin 4: Less than or equal to 0.7 V (Lo), Pin 5: Do not touch. 4) Check if the conductor pattern on the PLG board is short circuited or open circuited. 5) Replace the laser optical unit. 6) Replace the PLG board. YES Is the deformed image output? NO→ (e-STUDIO520,e-STUDIO600,e-STUDIO720) 1) Check if the connector CN209 on the PLG board is about to be disconnected. 2) Check if the harness is about to be open circuited and the connector pin is disconnected. 3) Check if the following signals are transmitted on the pins of the connector CN209 on the PLG board. Pin 1: 27}1V, Pin 2: GND, Pin 3: Less than or equal to 1V (Lo), Pin 4: Less than or equal to 0.7 V (Lo), Pin 5: Do not touch. 4) Check if the conductor pattern on the PLG board is short circuited or open circuited. 5) Check if the laser unit cooling fan is not stopped. 6) Check if the intake area of the laser unit cooling fan is not blocked. 7) Replace the laser optical unit. 8) Replace the PLG board. (e-STUDIO850) 1) Check if the connector CN206 on the PLG board is about to be disconnected. 2) Check if the harness is about to be open circuited and the connector pin is disconnected. 3) Check if the following signals are transmitted on the pins of the connector CN206 on the PLG board. Pin 1: 27}1V, Pin 2: GND, Pin 3: Less than or equal to 1V (Lo), Pin 4: Less than or equal to 0.7 V (Lo), Pin 5: Do not touch. 4) Check if the conductor pattern on the PLG board is short circuited or open circuited. 5) Check if the laser unit cooling fan is not stopped. 6) Check if the intake area of the laser unit cooling fan is not blocked. 7) Replace the laser optical unit. 8) Replace the PLG board. YES 1) Check if the conductor pattern on the PLG board is short circuited or open circuited. 2) Check if the grounding wire of the high-voltage unit (e.g. developer unit, transfer unit) is grounded securely. 3) Check if the bias contact point of the high-voltage unit is contacted securely. (Check if the point is not stained either.) 4) Check if the metal plates of the transport system are grounded securely. 5) Check if the equipment is grounded securely? 6) Check if the laser unit cooling fan is not stopped. 7) Check if the intake area of the laser unit cooling fan is not blocked. 8) Replace the laser optical unit.