• Code: CE1
• Description: Image quality sensor abnormal (OFF level)
• Remedy: Is the connector of the image quality sensor, or the connector J113, J114, J115 or J119 on the LGC board, or the connector J182 on the IMC board disconnected? Is the harness between the LGC board and the image quality sensor, or the harness between the LGC board and the IMC board, or the harness between the LGC board and the switching power supply open-circuited? Y: Reconnect the connector. Replace the harness. N: Is LED (D17) on the LGC board lit? Is the output voltage from the 12V-power supply normal? Y: Check the power supply system and replace the switching power supply. N: 1. Replace the image quality sensor. 2. Replace the LGC board. 3. Replace the IMC board.

• Code: CE2
• Description: Image quality sensor abnormal (no pattern level)
• Remedy: 1. Check that the transfer belt unit is fully raised. 2. Check that the transfer/transport unit is securely inserted. 3. Check for any abnormal stain, large flaw or break on the transfer belt surface. 4. Check that the drum and transfer belt are operating. If abnormal, correct any mechanical problem. Is any of the connectors J113, J114, J115,J119 or J123 on the LGC board disconnected? Is the connector J182 on the IMC board disconnected? Is the harness between the LGC board and the IMC board open-circuited? Is the connector of the image quality sensor disconnected or stained? Is the harness between the LGC board and the image quality sensor open-circuited? Is the main high-voltage transformer connector disconnected? Is the harness between the LGC board and the main high-voltage transformer open-circuited? Is the transfer transformer connector disconnected? Is the harness between the LGC board and the transfer transformer open-circuited? Is any of the high-voltage contact points of the transfer belt unit in faulty contact? Is any contact points stained? Is the harness of the main high-voltage transformer or the transfer transformer disconnected or open-circuited? Y: Reconnect the connector. Replace the harness. Clean the connector or contact point. Correct the contact point. N: Is LED (D17) on the LGC board lit? Is the output voltage from the 12V-power supply normal? Y: Check the power supply system, and replace the switching power supply. N: 1. Replace the image quality sensor. 2. Replace the LGC board. 3. Replace the IMC board.

• Code: CE3
• Description: Abnormal image caused by poor charge
• Remedy: Is the transfer belt stained with toner? Y: Clean the transfer belt. Does an error occur even after cleaning it? Y: Check and correct according to the following order. 1. Check that the main charger is securely installed. If not, correct it. 2. Check that the charger wire is not cut. If it is cut, replace it. 3. Check that the connector of the harness for the high voltage supply is securely connected or the harness is not abnormal. If there is any abnormality, correct it. 4. Check that 24 V is supplied to the high voltage power supply. If not, check that the harness between the high voltage power supply and the LGC is securely connected or that the harness is not abnormal. If it has any problem, correct it. 5. Replace the high voltage power supply. 6. Replace the LGC board. N: Does the transfer belt have any large flaw? Y: Replace the transfer belt. N: Is the color registration sensor stained? Y: Clean the emitting area of the color registration sensor. N: Check according to the following order. 1. Check that 12 V is supplied to the LGC board and the color registration sensor. If not, check that the harness and the connector between the color registration sensor and LGC, and between LGC and IMC are securely connected or the harness is not abnormal. 2. Replace the color registration sensor. 3. Replace the LGC board.

• Code: CE4
• Description: Image quality control test pattern abnormal
• Remedy: (1) Use "Image quality control abnormal detection counter Y~K display/0 clearing (08- 415~418)" to check the abnormal occurring condition for each color. (2) Check "Output value display of image quality sensor/Low-density pattern (05-819)" to confirm if the value is under 300 (low-density pattern abnormal) for each color. (3) Check "Output value display of image quality sensor/High-density pattern (05-820)" to confirm if the value is 600 or above (high-density pattern abnormal) and identify the color which pattern is abnormal. (4) Set the values of "Image quality control 2(08-401)", "Image quality control 5(08-402)" and "Image quality control 4(08-411)" to "0" (disabled). (5) Output the image quality control test pattern (04-270) and check the patch of the color identified in step (3) to see if the image is abnormal (image omitted, all blank, all solid, etc.). (6) Replace the image quality sensor. (7) Set the values of "Image quality control 2 (08-401)", "Image quality control 5 (08-402)" and "Image quality control 4 (08-411)" to "1" (enabled). (8) Perform "Forced performing of image quality control (05-878)" and make sure it is completed normally (Error [CE4] does not appear). (9) Clear all "Image quality control abnormal detection counter Y~K display/0 clearing (08- 415~418)". (10)If any of the specified parts has been replaced, perform "Automatic initialization of image quality control (05-879)"

• Code: CE5
• Description: Temperature/humidity sensor upper-limit abnormal
• Remedy: Is the harness between the LGC board and the temperature/humidity sensor disconnected ? Is the connector J108 on the LGC board or the connector of the temperature/humidity sensor disconnected ? Y: Reconnect the connector. Replace the harness. N: 1. Replace the temperature/humidity sensor. 2. Replace the LGC board.

• Code: CE6
• Description: Drum thermistor abnormal (Y)
• Remedy: Is the harness between the LGC board and the drawer connector for EPU disconnected ? Is the harness inside of the EPU and the harness of the drum thermistor Y or K disconnected ? Is the connector J120 on the LGC board, or the connector of the drum thermistor Y or K disconnected ? Y: Reconnect the connector. Replace the harness. N: 1. Replace the drum thermistor Y or K. 2. Replace the LGC board.

• Code: CE9
• Description: Drum thermistor abnormal (K)
• Remedy: Is the harness between the LGC board and the drawer connector for EPU disconnected ? Is the harness inside of the EPU and the harness of the drum thermistor Y or K disconnected ? Is the connector J120 on the LGC board, or the connector of the drum thermistor Y or K disconnected ? Y: Reconnect the connector. Replace the harness. N: 1. Replace the drum thermistor Y or K. 2. Replace the LGC board.

• Code: CF1
• Description: Color registration control abnormal
• Remedy: <Check of the status of color registration sensor error> 1. While pressing [0] and [5] simultaneously, turn the power ON. 2. Enter [461] with digital keys and press the [START] key. 3. The color registration control result is displayed in four values (Y(0), M(1), C(2), K(3)). 4. Check the value for Y(0) displayed in 3.. When [CF1] has occured, a value from 1 to 15 is displayed (normal if 0 or 16 or above). 1-14: Data error (color registration sensor is normal) 15: Reading error of color registration test pattern <Disabling the color registration control> 5. While pressing [0] and [8] simultaneously, turn the power ON. 6. Enter [742] with digital keys and press the [START] key. 7. Set the color registration control setting to "1" (manual). 8. Enter [743] with digital keys and press the [START] key. 9. Set the color registration control during the warming-up to "0" (disabled). 10.Turn the power OFF. <Check by the forced performing of color registration control > 11.While pressing [0] and [5] simultaneously, turn the power ON. 12.Enter [407] with digital keys and press the [START] key. - (Forced performing of color registration control) * At this time, use a digital tester to monitor the test point TP29 (front color registration sensor output) and TP28 (rear color registration sensor output) on the LGC board. . If the outputs are normal . Before starting the forced performing of color registration control, a voltage of approximately 0.7V DC is displayed. After starting it, the voltage changes to approximately 4.4V DC, and this may drop instantaneously down to 0.7V DC. (There may be no fluctuations in voltage, depending on the reaction speed of the digital tester.) When the forced performing of color registration control is finished, the voltage returns to approximately 0.7V DC. <Check by the grid pattern> 13.While pressing [0] and [5] simultaneously, turn the power ON. 14.Enter "1" with digital key and press the [PRINTER/NETWORK] key. 15.Check the output grid patterns of yellow, magenta, cyan and black if there is image density difference among the front/center/rear areas or abnormality in the overall image. * At this time, there is no problem even if the Y, M, C and K grid patterns are out of alignment. – If there is difference in tonal balance between the front and rear areas – • Check the state of contact of the photoconductive drum and the transfer belt. • Check the quantity of developer (check whether developer material is properly supplied onto the surface of the developer sleeve). – If there is any streak of yellow, magenta, cyan or black streak in the secondary-scanning direction – • Check if there is any stain or dust on the main charger wire that corresponds to the color of the streak. – If there is any white streak in the secondary-scanning direction – • Check if there is any stain or dust on the slit glass of the laser optical unit. – If the entire page is solid in a specific color – • Abnormality of the main high-voltage transformer corresponding to that color or abnormalityof the laser optical unit. Of the four main high-voltage transformers, exchange the main high-voltage transformer considered to be abnormal for other main high-voltage transformer considered to be normal, and then output the chart again. If the solid color over the entire page changes as the result of exchanging the main high-voltage transformer, that main high-voltage transformer is abnormal. If the solid color over the entire page does not change, check whether there is any disconnection of the harness between the LGC board and the main high-voltage transformer or whether the power supplys to the main charger (disconnection of high-voltage harness or contact defects). If there is no problem, check the laser optical unit. If the density is low on both front and rear sides and any of the above abnormalities are not found, make the following check. <Check by the gradation pattern> 16.While pressing [0] and [5] simultaneously, turn the power ON. 17.Enter "4" with digital key and press the [PRINTER/NETWORK] key. 18.Check the output gradation images for gamma adjustment if there is any abnormality in the gradation of yellow, magenta, cyan and black. – If there are any abnormalities – (1) Check if the photoconductive drum and transfer belt are operating. If not, correct any mechanical problems. (2) Check if the transfer belt unit is raised fully upward. (3) Check if the transfer/transport unit is inserted securely. (4) Check the surface of the transfer belt for any abnormal stain, large flaw or break. (5) Check if the connector of the transfer transformer is disconnected. (6) Check if any of the high-voltage harnesses of the main high-voltage transformer/ transfer transformer is disconnected. (7) Check the harness between the LGC board and the transfer transformer if it is open-circuited. (8) Check the high-voltage contacts of the transfer belt unit if they are contacting properly or if they are not dirty. (9) Check if any of the high-voltage harnesses is disconnected. (10) Check if the connector J113, J114 or J119 on the LGC board is disconnected. (11) Check if the connector J181, J182, J185 or J188 on the IMC board is disconnected. (12) Check if the harness between the LGC board and the color registration sensor is open-circuited. (13) Check if the color registration sensor connector is disconnected. (14) Check if any of the main high-voltage transformer connectors is disconnected. (15) Check if any of the harnesses between the LGC board and the main high-voltage transformers is open-circuited. (16) Replace the transfer transformer. (17) Replace the main high-voltage transformer. 19. Check the sensor detection area of the transfer belt for any damage, and if damaged, replace the transfer belt. 20. Check the emitting/receiving area of the color registration sensor if it is not dirty. * Be sure to do the following after having made checks and corrections: 1. While pressing [0] and [8] simultaneously, turn ON the power. 2. Enter [742] with digital keys and press the [START] key. 3. Set the color registration control setting to "0" (automatic). 4. Enter [743] with digital keys and press the [START] key. 5. Set the color registration control during warming-up setting to "1" (enabled). 6. Turn OFF the power.