• Code: CD70
• Description: Waste toner box mixing paddle locked. Waste toner box mixing paddle locked: The mixing paddle in the waste toner box does not rotate.
• Causes: Waste toner box Waste toner paddle motor (M6) Waste toner paddle motor lock detection sensor (S14) LGC board
• Remedy: 1 Do the paddles in the waste toner box rotate? (Actually make them rotate.) Yes 2 No Replace the waste toner box. 2 Is the waste toner paddle motor (M6) rotating? (Perform the output check: 03-414) Yes 5 No 3 3 Waste toner paddle motor (M6) • Connector and relay connector check • Check if there is any damage or abnormality in the gears on the driving cascade of the waste toner paddle motor. 4 LGC board • Connector check (CN359) • Board check 5 Is the waste toner paddle motor lock detection sensor (S14) operating normally? (Perform output check: 03-[FAX] OFF/[1]/ [C]) * To judge an error, check if the sensor detects each status of normal display and highlighted display. Yes 7 No 6 6 Waste toner paddle motor lock detection sensor (S14) Connector and relay connector check 7 LGC board • Connector check (CN359) • Board check

• Code: CD71
• Description: Waste transport motor drive locking error. Waste toner transport motor drive locking error: The auger in the waste toner transport path does not rotate.
• Causes: Waste toner transport motor (M31) Auger lock detection sensor (S42) LGC board
• Remedy: 1 Is the waste toner transport motor (M31) rotating? (Perform the output check: 03-415) Yes 4 No 2 2 Waste toner transport motor (M31) • Connector and relay connector check • Check if there is any damage or abnormality in the gears on the driving cascade of the waste toner transport motor. 3 LGC board • Connector check (CN342) • Board check 4 Is the auger lock detection sensor (S42) operating normally? (Perform output check: 03-[FAX] ON/[2]/[G]) * To judge an error, check if the sensor detects each status of normal display and highlighted display. Yes 6 No 5 5 Auger lock detection sensor (S42) Connector and relay connector check 6 LGC board • Connector check (CN359) • Board check

• Code: CD72
• Description: Waste toner motor locking error ("Waste toner box replacement"). "Waste toner box replacement" appears when either CD70 or CD71 error occurs. The error code CD72 is noted on the error history and logs.
• Causes: Waste toner box
• Remedy: 1 Waste toner box Replace it according to the displayed instruction. Notes: If you close the access cover without replacing the waste toner box, a message prompting you to turn the power OFF and then back ON appears, followed by CD70 or CD71. Replace the waste toner box first to check if CD70 or CD71 is cleared. If not, follow the troubleshooting procedure for CD70 or CD71. 2 Power supply unit Turn the power OFF and then back ON according to the displayed instruction. 3 CD70 or CD71 display Follow the troubleshooting procedure for CD70 or CD71.

• Code: CDE0
• Description: Paddle motor abnormality. Paddle motor abnormality: The paddle motor is not rotating or the paddle is not rotating normally.
• Causes: Paddle motor Finisher control PC board
  Paddle motor (M8) Finisher control PC board
• Remedy: MJ-1101 Paddle Rotate the paddle. Fix any mechanical problem. Paddle motor Check if the connector (CN22) on the finisher controller PC board is disconnected from the paddle motor (M3) and the harnesses are open circuited. Correct if so.
  MJ-1106 Paddle IRotate the paddle. Fix any mechanical problem. Paddle motor (M8) Check the connectors and harnesses between the paddle motor (M8) and the finisher control PC board (CN6).

• Code: CE00
• Description: Punch communication error. Communication error between finisher and punch unit: Communication error between finisher controller PC board and punch controller PC board
• Causes: Hole punch control PC board (HP) Finisher control PC board
  Hole punch control PC board (HP)
• Remedy: MJ-1101 (When MJ-6103 is installed) Hole punch control PC board (HP) • Check the connectors and harnesses between the hole punch control PC board (HP) and the finisher control PC board. • Board check
  MJ-1106 (When MJ-6103 is installed) Hole punch control PC board (HP) • Check the connectors and harnesses between the hole punch control PC board (HP) and the finisher control PC board. • Board check

• Code: CE10
• Description: Image quality sensor abnormality (OFF level). Image quality sensor abnormality (OFF level): The output value of this sensor is out of a specified range when sensor light source is OFF.
• Causes: Switching power supply Image quality sensor LGC board
• Remedy: Image quality sensor Connector check LGC board • Connector check (CN337) • Check the harnesses between the LGC board and the image quality sensor. • Check the harnesses between the LGC board and the switching power supply. • Check if the +12V voltage is normally output by the CN345- 7pin on the LGC board.

• Code: CE20
• Description: Image quality sensor abnormality. Image quality sensor abnormality (no pattern level): The output value of this sensor is out of a specified range when the image quality control test pattern is not formed.
• Causes:
• Remedy: 1 • Is the transfer belt or the transfer belt unit securely installed? • Are there any abnormal stains (cleaning defects), large scratches or breaking on the transfer belt surface? • Are the drum and the transfer belt rotating? Yes 5 No 2 2 Transfer belt unit Check if the transfer belt unit is securely installed. Correct it if not. 3 3 Transfer belt Check if any toner image remains on the transfer belt surface. If any, check the installation status of the TBU cleaner unit. If there is any abnormality, correct it, and clean the transfer belt. 4 4 Drum and transfer belt Check if the drum and the transfer belt are properly operated. (ON: 03-101 / OFF: 03-151) If they are not rotating normally, check if their drive gears are damaged or if they contact the equipment. Correct it if needed. 18* 5 • Is the sensor shutter of the image quality sensor opening or closing normally? Or is it normal without any damage? • Is the sensor surface of the image quality sensor clean? Yes 8 No 6 6 Sensor unit Take off the transfer belt unit so that you can see the sensor unit. 7 Sensor shutter • Check if the sensor shutter is opening or closing normally. (Opening: 03-125 / Closing: 03- 175) If the sensor shutter is not opening or closing, check if it is damaged or there is any abnormality in the sensor shutter solenoid. • Check the connector and the harness between the sensor shutter solenoid and the LGC board. (LGC CN337-8pin, 9pin) • Slide the sensor shutter so that the sensor surface can be seen. Clean the sensor surface with a cotton swab or a soft cloth. Clean the area around the sensor (e.g.: sensor shutter) if it is stained, so that the sensor surface does not become dirty. 18* 8 Image quality sensor Check the connectors and harnesses between the LGC board (CN337) and the image quality sensor. * 9 • Is +12V power supply voltage normally supplied to the image quality sensor? • Is +12V voltage normally output by the CN345-7pin on the LGC board? Yes 12 No 10 10 Switching power supply Check if +12V voltage is output by the switching power supply (PS-ACC CN404-7pin). 11 LGC board • Check if +12V voltage is output by the CN345-7pin on the LGC board. • Check if the supply harness between the switching power supply and the LGC board is open circuited, damaged or disconnected. 18* 12 Set the values of "Image quality closed-loop control / Contrast voltage (08-2486)" and "Image quality closed-loop control / Laser power (08-2487)" to "0" (Invalid). 13 Perform “Enforced performing of image quality open-loop control (05-2740)”. 14 Output the image quality control test pattern (04-270) more than one time and the list print ([9][START]). Is the image normal? Yes 16 No 15 15 Abnormal image Correct the abnormal image. Blank print, Solid print, White banding, Color banding, White spots, Poor transfer, Uneven image density, Faded image (low density), Uneven light distribution, Blotched image. * Blank print: including when one of the YMCK colors is not printed. 17 16 Replace the image quality sensor or the LGC board. 17 Set the values of “Image quality closed-loop control / Contrast voltage (08-2486)” and “Image quality closed-loop control / Laser power (08-2487)” to “1” (Valid). 18 Perform "Forced performing of image quality closed-loop control (05-2742)" and make sure it is completed normally. (Error [CE10], [CE20] and [CE40] do not appear.) Yes 20 No 19 19 Check and correct it accordingly. 20 Perform "Automatic gamma adjustment". 21 Reset all of the values in the codes “Abnormality detection count (Y/M/ C/K) Display/0 clearing (08-2528 to 08-2531)”.

• Code: CE40
• Description: Image quality control test pattern abnormality. Image quality control test pattern abnormality: The test pattern is not formed normally
• Causes:
• Remedy: 1 <Color toner low density> Check the printing status. Is the color printing ratio 5% or more? Yes 2 No The color toner low density might be the cause. Turn the code 08-2692 "Prevention of color toner low density / ON/OFF setting" to ON, and then set number of sheets to be judged at the code 08- 2693 "Prevention of color toner low density/Judged number of sheets setting". 2 Check if there is any abnormality on the hand grips and rods of the main charger cleaner. Correct if there is. 3 Check if the drum is rotated properly by turning the coupling of the developer unit. Correct the auger and the surrounding hardware if not. 4 Laser optical unit • Check the connectors and harnesses between the LGC board (CN343, CN355, and CN356) and the laser optical unit. • Check if there is any stain or scratch on the glass surface of the laser optical unit. Clean or correct if there is. 5 Check if there is any stain on the image quality sensor and Image position aligning sensors. 6 Check if the sensor shutter is working properly. 7 Use “Image quality control abnormal detection counter Y to K display/0 clearing (08-2528 to 2531)” to check the abnormal occurring condition for each color. 8 Check “Output value display of image quality sensor / Low-density pattern (05-2732-0 to 3)” to check if the low-density pattern abnormality occurs for each color. Are the values 180 or more for Y, M and C, and 20 or more for K? Yes 10 No 9 9 Low-density pattern abnormality Check the transfer belt. If the cleaning is poor, check the installation status of the transfer belt cleaner unit and correct it if necessary. 19* 10 Check “Output value display of image quality sensor / Highdensity pattern (05-2731-0 to 3)” to check if the high-density pattern abnormality occurs for each color and identify the color which pattern is abnormal. Is the value 628 or less? Yes 13 No 11 11 High-density pattern abnormality Check if the laser shutter is working properly. 1. Take off the developer unit so that the laser shutter can be easily seen. Clean around the laser shutter if the developer has been spilled over. 2. While pressing the digital keys [0] and [3] simultaneously, turn the power ON. 3. Key in “417”. 4. Press the [START] button repeatedly to open and close the shutter alternatively. If the laser shutter does not open/ close, check the shutter and correct it if necessary. 12 Check if the developer unit has been installed properly. Visually check the installation status of the developer unit, and correct it if there is any abnormality. 19* 13 Set the values of "Image quality closed-loop control / Contrast voltage (08-2486)" and "Image quality closed-loop control / Laser power (08-2487)" to "0" (Invalid). 14 Perform "Enforced performing of image quality open-loop control (05-2740)". 15 Output the image quality control test pattern (04-270) more than one time and the list print ([9][START]), and check the patch of the color identified in step (7). Is the image normal? Yes 17 No 16 16 Abnormal image Correct the abnormal image. Blank print, Solid print, White banding, Color banding, White spots, Poor transfer, Uneven image density, Faded image (low density), Uneven light distribution, Blotched image. * Blank print: including when one of the YMCK colors is not printed. 18 17 Replace the image quality sensor or LGC board. 18 Set the values of “Image quality closed-loop control / Contrast voltage (08-2486)” and “Image quality closed-loop control / Laser power (08-2487)” to “1” (Valid). 19 Perform “Forced performing of image quality closed-loop control (05-2742).” Is it completed normally? Yes 21 No 20 20 Check and correct it accordingly. 21 Perform "Automatic gamma adjustment". 22 Clear all “Image quality control abnormal detection counter Y to K display/0 clearing (08-2528 to 2531)”. 23 Check if any of the springs for supplying power to the transfer belt unit is deformed. Replace the spring if it is deformed.