• Code: CE40
• Description: 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 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.

• Code: CE50
• Description: Temperature/humidity sensor abnormality: The output value of this sensor is out of a specified range.
• Causes: Temperature/humidity sensor LGC board
• Remedy: Temperature/humidity sensor Check the connectors and harnesses between the temperature/ humidity sensor and LGC board (CN342).

• Code: CE60
• Description: Drum thermistor-Y abnormality: The output value of the drum thermistor-Y is out of a specified range
• Causes: Drum thermistor Y LGC board
• Remedy: Drum thermistor Connector and harness check of drum thermistor Y LGC board • Check the harnesses between the LGC board and the drawer connector for developer unit. • Connector check (CN340)

• Code: CE70
• Description: Drum drive switching abnormality: The drum switching detection sensor (S19) is not turned ON after the drum motor was rotated for a specified period of time.
• Causes: Drum switching motor (M11) Drum switching detection sensor (S19) LGC board
• Remedy: 1 Is the drum switching motor (M11) operating properly? (Perform the output check: 03-240) Yes 5 No 2 2 Drum switching motor (M11) Check the connector of the motor and joint connectors 3 Drum switching detection sensor (S19) Sensor check 4 LGC board • Connector check (CN339) • Board check 5 Is the drum switching detection sensor (S19) working? (Perform the input check: 03-[FAX]ON/[0]/ [E] (Highlighted in the color mode)) Yes 8 No 6 6 Drum switching detection sensor (S19) • Sensor, connector, joint connector check • Check if there is any foreign matter such as grease in the detection area of the drum switching detection sensor. 7 LGC board • Connector check (CN339) • Board check 8 Is the drum switching motor assembled in the drum drive unit able to be rotated smoothly by hand? Yes 10 No 9 9 Drum switching motor (M11) • While reinstalling the drum switching motor, push it so that its gear will slightly move away from the engaging gear. • Check the bracket in which the drum switching motor is installed. If it is deformed, replace it. 10 Is the drum switching guide able to be moved smoothly by hand after the drum switching motor has been removed? Yes 12 No 11 11 Drum switching motor (M11) Check if the slide area (guide, plate) of the drum switching guide is deformed or any foreign matter is attached to it. (Replace it if there is.) 12 LGC board Board check

• Code: CE71
• Description: Drum phase adjustment abnormality: Drum phase sensors (Color drum phase sensor (S43) and K drum phase sensor (S44)) are not turned ON after the drum motor was rotated for a specified period of time.
• Causes: Drum motor (M10) Drum drive unit • Color drum phase sensor (S43) • K drum phase sensor (S44) LGC board
• Remedy: 1 • Is the error cleared after the power is turned OFF and then back ON? • Is the drum motor (M10) operating properly? (Perform the output check: ON 03-101 / OFF 03-151.) * Check the operation after removing all process units (EPU (Y, M, C, K)). Yes 5 No 2 2 Drum motor (M10) Connector check 3 Drum drive unit Check if their drive gears are damaged or if they contact with the equipment. Correct if any. 4 LGC board • Connector check (CN332) • Board check 5 Rotate the drum of each EPU in the direction of the arrow once. (See the figure below.) If the rotation of the drum is extremely heavy or not smooth, check if the mechanism of the EPU is normal. Fig. 8-1 6 Rotate the drum with 03-101. Are the drum phase sensors (Color drum phase sensor (S43) and K drum phase sensor (S44)) are operating properly? (Perform the input check: Color 03-[ALL]OFF/[1]/[F] K 03-[ALL]OFF/[1]/[E].) Yes 9 No 7 7 Drum phase sensor • Check the connector of the drum phase sensors (S43, S44) and joint connectors • Check if there is any foreign matter such as grease in the detection area of the drum phase sensors (S43, S44). 8 LGC board • Connector check (CN332) • Board check 9 Drum drive unit Check if the drive gears are installed properly. (Check if the mark on each gear is aligned with the area of the punched mark on the frame.) 10 Actuator Check if the actuator is installed properly. 11 LGC board Board check
  CE71 error can be prevented by setting the drum phase adjustment control OFF in the self-diagnostic code below. The setting value shall be returned after the recovery, otherwise color deviation increases. Drum phase adjustment control ON/OFF code 08-4766 0: Disabled 1: Enabled (Default)

• Code: CE90
• Description: Drum thermistor-K abnormality: The output value of the drum thermistor-K is out of a specified range.
• Causes: Drum thermistor K LGC board
• Remedy: Drum thermistor Connector and harness check of drum thermistor K LGC board • Check the harnesses between the LGC board and the drawer connector for developer unit. • Connector check (CN340)

• Code: CEC1
• Description: 2nd transfer roller contacting position detection abnormality
• Causes: Registration motor (M19) LGC board 2nd transfer roller position detection sensor (S29)
• Remedy: 1 Is the 2nd transfer roller's contact and release proper? (Perform output check: 03-239) Yes 4 No 2 2 Registration motor (M19) • Connector check • Harness check 3 LGC board • Connector check (CN332) • Board check 4 Is the 2nd transfer roller position detection sensor (S29) working properly? (Perform input check: 03-[ALL]OFF/[7]/[E]) Yes 7 No 5 5 2nd transfer roller position detection sensor (S29) • Connector and relay connector check • Harness check 6 LGC board • Connector check (CN337) • Board check 7 Mechanical section Sensor check 8 LGC board Board check

• Code: CEC2
• Description: 2nd transfer roller releasing position detection abnormality
• Causes: Registration motor (M19) LGC board One-way clutch gear at the end of the shaft 2nd transfer roller position detection sensor (S29)
• Remedy: 1 Is the 2nd transfer roller's contact and release proper? (Perform output check: 03-239) Yes 9 No 2 2 Is the registration motor (M19) rotating? Yes 5 No 3 3 Registration motor (M19) • Connector check • Harness check 4 LGC board • Connector check (CN332) • Board check 5 Is the 2nd transfer roller holding arm operated smoothly when it is pushed? Yes 8 No 6 6 2nd transfer roller pressure spring Check that the spring is installed properly (not running off the frame of the mold). 7 Parts surrounding the 2nd transfer roller Check if there is any damage or abnormality. 8 One-way clutch gear at the end of the shaft Replace it. 9 Is the 2nd transfer roller position detection sensor (S29) working properly? (Perform input check: 03-[ALL]OFF/[7]/[E]) Yes No 10 10 LGC board • Connector and relay connector check • Harness check 11 Parts surrounding the 2nd transfer roller • Connector check (CN337) • Board check 12 Mechanical section Sensor check 13 LGC board Board check