E020 Error Code Workflow
Contents
1. 3 Replace the ATR Sensor Refer to the service manual when replacing the sensor When replacing the ATR Sensor it is also necessary to replace the Developing Assemblies 1 Execute the remedy same as for xxAO 1 Execute the remedy same as for xxA1 1 Check DISPLAY gt DENS gt SPL LG Y W C K gt If all values are 00 go to step 2 If not go to step 3 2 Feed solid black image 3 Clean the ATR Sensor window 4 Replace the ATR Sensor Refer to the service manual when replacing the sensor When replacing the ATR Sensor it is also necessary to replace the Developing Assemblies 1 Check DISPLAY gt DENS gt SPL LG Y M C K gt If all values are more than 01 check toner level of the Toner Cartridge and Hopper 2 Check if the Hooper Toner Level Sensor Connector is physically removed 3 Feed solid white image 4 Clean the ATR Sensor 5 Replace the ATR Sensor Refer to the service manual when replacing the sensor When replacing the ATR Sensor it is also necessary to replace the Developing Assemblies 1 Execute the remedy same as for xxA0 1 Execute the remedy same as for xxAO xx10 xx13 xx81 xx93 xxC2 xxDA and xxDB xx10 Initial Sig value is less than 62 in INIT control initial Turn OFF and then ON the main power Replace xx86 Patch image sampling center error 2 1 Execute the test print TEST gt P2. Measured value Y M C L of Developer density on the Developing Cylinder The value will be measured every job D Y M C TRGT Target value of Developer density Y M C Input the values recorded on the service label on the inside of the engines front cover in COPIER gt ADJUST gt DENS gt SGNL Y M C D L TRGT Target value of the Developer density L Checking the Operation of the ATR Solenoid SL9 e Check the operation of the ATR Sensor Solenoid SL9 using the Part Check Function in Service Mode After enabling the Solenoid in Service Mode COPIER gt FUNCTION gt PART CHK gt SL 71 gt lt READY a a ae JENN CEE CON S 2 SEMEN e SL9 s operation can be verified by listening for clicks made by the activation and deactivation of the component 14 Troubleshooting the ATR Sensor Check the CP PRINT specifically DISPLAY gt DENS gt SGNL Y M C DISPLAY gt DENS REF 516 Developer Density peppy 516 Updated at Power On pppoe 516 oe 7 Current Status SGNL M 537 eee F E pean 522 ower Lighter Check the condition and operation of the ATR Sensor Solenoid SL9 and the Shutter Check and clean the ATR Sensor Window Check if the ATR Sensor connector is physically removed or if the wires are damaged perform any necessary repair Check the ATR Control Reference Values in Service Mode COPIER gt DISPLAY gt DENS gt REF Y M C and REF L imagePRESS C1 Check the ATR Control Signal Values in Service Mode COPI
3. the reverse direction fluidity can be disrupted and a buildup of Developer Toner material in one area of the Developer Assembly or across the entire Developer Cylinder can occur If the buildup cannot be removed by rotating the Developer Cylinder in the normal direction 1 try removing the build up with a clean sheet of paper by scooping it out and then carefully pour it back onto the Developer Cylinder while rotating the Developer Cylinder in the normal direction 26 Performing a Developer Change In lieu of replacing the entire Developer Assembly the technician has the ability to replace only the Starter Developer e Required maintenance and cleaning should be performed at this time e The ATR Sensor and the Patch Image Sensor must be cleaned e ATR Sensor and the Patch Image Sensor proper operation should be checked Replacing the Start Developer or Developer Assembly After replacing the Start Developer or Developer Assembly perform the subsequent Service Execute aging in the following order imagePRESS C1 FUNCTION gt INSTALL gt STIR 4 or Y M C K imagePRESS C1 FUNCTION gt INSTALL gt STIR 5 or Y M C K L NOTE Clean the ATR and Patch Image Sensors Execute 20 sheets of duplexing print for Blue solid color image 11 x 17 Execute 20 sheets of duplexing print for Green solid color image 11 x 17 Execute 20 sheets of duplexing print for Red solid color image 11 x 17 Execute 10 sheets of duplexi
4. xx93 xx85 Patch image sampling center error 1 1 Execute the remedy same as for xx84 DISPLAY gt DENS gt DENS S Y IW C K patch image measurement value DISPLAY gt DENS gt D CRNT P dark current measurement value lt 30 Error in patch image density lower limit 1 Check DISPLAY gt DENS gt SPL LG Y M C K During printing DISPLAY gt DENS gt DENS S Y MC K patch image gt Check that the value is 00 then go to step 2 measurement value lt 16 patch density is too high 2 Replace the Patch Sensor 3 Replace the Potential Sensor Error in developer density lower limit 1 Execute the remedy same as for xx90 The value of DISPLAY gt DENS gt DENS S Y M C K patch image measurement value is less than 5 3 times in a row E061 s Potential Control In order to stabilize printing the engine executes Potential Control to optimize the electrostatic latent image factors i e Grid Bias Developer Bias and Laser Intensity When any of these image formation components malfunction Potential Control can fail and an E061 is generated Failures in Potential Control can ultimately result in an E020 error Code Canon
5. E020 Error Code Workflow e In an effort to assist the field troubleshooting E020 Error Codes Canon U S A Inc is introducing this imagePRESS C1 Series E020 Workflow Course The workflow includes links to valuable information including error code definitions theory practical fixes and most importantly direction on how to troubleshoot various E020 Error Codes Troubleshooting E020 Error Codes eck the Solenoid and Shutter Sensor Sensor Replacing xxA0O xxC1 ATR Sensor PS7 Contaminated Failed the ATR i Sensor PS7 Any E025 s COPIER gt DISPLAY gt DENS S Y M C K and Identify DENS Y M C and DENS L COPIER gt DISPLAY gt DENS gt PCH LED1 2 3 the xx10 xx13 xx81 xx93 Patch Image Sensor PS3 Check the Solenoid Replacing the Detail eee a PS3 Check the Shutter Patch Image Code Check the Slide Rod Sensor PS3 Any E061 s mT COPIER gt FUNCTION gt DCP gt DRM RESET Dust Proof Glass Clean xx85 xx90 Photosensitive and xx93 Drum Check aia Corona Monitor COPIER gt DISPLAY gt DPOT K Ires Check Drum for Worn Verify that the value is within a Ends reasonable range 400 to 950 Using a PG 10 to Help Identify E020 s Understanding E020 Error Codes E020 xxyy Error Codes indicate a deviation of signals derived from the ATR Sensor and the Patch Image Sensor The deviation of signals can come from a number of different incidents or malfunctions within the Rotary As
6. ER gt DISPLAY gt DENS gt SGNL Y M C and SGNL L imagePRESS C1 If the Reference value 462 562 or optical Signal value 250 760 are not within specification replace the ATR Sensor Cleaning the ATR Sensor Cleaning the ATR Sensor Window and the ATR Sensor Shutter 1 Remove the ATR Sensor from the Main Body 2 Press the Plunger 1 of the ATR Sensor Lever Solenoid in the direction of the arrow 3 Clean the ATR Sensor Window 2 and the ATR Sensor Shutter 3 with lint free paper 4 Clean the ATR Sensor 75 000 50 000 Prints Prints 16 Replacing the ATR Sensor PS7 When the ATR Sensor is replaced the Developer Assemblies must be replaced to bring the Developing Block to an optimal standard At this time an INIT must be executed in Service Mode in order to generate and store the new Developing values imagePRESS C1 FUNCTION gt INSTALL gt INIT 3 or Y M C imagePRESS C1 FUNCTION gt INSTALL gt INIT 4 or Y M C L The composition of the Black Toner is different from the Y M C L Toner Consequently the ATR Sensor is not used for the Black Developer therefore INIT K and SGNL K are not available in Service Mode After replacement of the ATR Sensor and the INIT has been performed a Full Auto Gradation Correction must be performed Patch Image Sensor PS3 Patch Sensor Shutter Solenoid SL8 e Patch Image Sensor PS3 FM2 2494 010 and Patch Image Sensor Shutter FL2 2710 000 Solenoid SL8 FM2 2650 000 De
7. G TYPE 5 96 toner density control at initial setting the Patch Sensor shutter or Patch sensor DISPLAY gt DENS gt DENS S Y MC K patch image D single color 4 colors xx11 Ini ial Sig value is more than 960 in INIT control Turn OFF and then ON the main power Replace ee Drum background Fabrak Dotor ss of Image gt check the initial toner density control at initial setting the Patch Sensor shutter or Patch sensor measurement value lt 30 2 If the value of DISPLAY gt DPOT gt PT LPW xx12 __ Initial Ref value is less than 62 in INIT control Turn OFF and then ON the main power Replace Y MWC K is more than 250 initial toner density control at initial setting the Patch Sensor shutter or Patch sensor 1 Clean the Dustproof Glass and check xx13___ Initial Ref value is more than 960 in INIT control Turn OFF and then ON the main power Replace 2 Replace Ihe drum i UA i mm A 3 Replace the Laser Scanner Unit clean initial toner density control at initial setting the Patch Sensor shutter or Patch sensor inside xxDA Variation in Sig initial data is more than 100 at Turn OFF and then ON the main power 3 Perform the remedy for xx84 initial setting Error in Patch Sensor Center dark current upper 1 Replacement due to sensor failure xxDB Variation in Ref initial data is more than 100 at Turn OFF and then ON the main power limit Execute FUNCTION gt MISC P gt PT LPADuJ initial setting DISPLAY gt DENS gt D CRNT P dark curr
8. Patch Image Sensor PS3 Developer Assemblies and the Photosensitive Drum Unit can be a direct cause of E020 Error Codes e Identifying the source of an E020 Error Code is not limited only to the information outlined in this Seminar Technicians must utilize all available resources to resolve E020 Error Codes ona first call basis Resources include the Service Manual the Enhanced Service Manual the Technical Reference Manual Technical Publications available from e Support e Support Forums applications such as the Service Support Tool NAVI and Canon U S A Inc s Technical Support Center Understanding Detail Sub Codes When troubleshooting E020 Error Codes the Detail Sub Codes indicate the root cause of the Error Code Interpretation of E020 Detail Codes xxyy The first two bits xx refer to the color 01 Yellow 02 Magenta 03 Cyan 04 Black 05 Clear C1 Only The second two bits yy indicate the actual fault Oar Sensor PS7 Associated Solenoid SL9 and the Shutter xxAO xxA1 xxA2 xxA3 xxA8 xxA9 xxCO and xxC1 Detail Codes are all related to the ATR Sensor PS7 FM2 8159 000 Solenoid SL9 FK2 0100 000 or the ATR Sensor Shutter FC6 1524 000 eCheck the readings for Target Reference and Signal Data from the ATR Sensor in Service Mode COPIER gt DISPLAY gt DENS REF Y M C amp REF L Developer density standard for the Developing Cylinder Y M C L SGNL Y M C amp SGNL L
9. d to the other If there is light density for a certain color s it may be caused by poor fluidity or clumping of Toner Developer in the Developer Assembly or fault of Primary Transfer Roller Laser Scanning System Photosensitive Drum Unit ITB or High Voltage System 2 White Black line If there are white black line within a certain color it may be caused by a foreign object in the Developer Assembly or problems with the Photosensitive Drum Unit or a soiled optics path In cases where there is no fault on the test print it may be caused by the PDL input side or the Reader side Paper Feed Direction an Front PG 10 Print 30 xxA0 xxA1 xxA2 xxA3 xxA8 xxAQ xxC0 xxC 1 XXAO XXC1 Sig value is less than 62 in ATR control Ref value is less than 62 in ATR control Sig value is more than 960 in ATR control Ref value is more than 960 in ATR control The value exceeds the upper limit 14 of detected TD ratio 3 times in a raw in ATR control The value falls below the lower limit 3 of detected TD ratio 3 times in a raw in ATR control Variation in Sig value is more than 100 in ATR control Variation in Ref value is more than 100 in ATR control 1 Execute the remedy same as for xxA1 2 Check by removing the ATR Sensor Shutter If it is OK replace the shutter and complete the remedy 1 Clean the ATR Sensor window 2 Check if the ATR Sensor Connector is physically removed
10. ent Select DISPLAY gt DENS gt PCH LED2 and check xx81 Error in Drum background light intensity reflected 1 After cleaning the Patch Sensor measurement value gt 930 the value of PCH LED2 light intensity from Drum surface lower limit execute FUNCTION gt MISC P gt PT LPADJ Check that the value is between 80 and 240 DISPLAY gt DENS gt P SENS P Drum background Select DISPLAY gt DENS gt PCH LED2 and check Error in Patch Sensor Front dark current lower 1 Execute the remedy same as for xx82 measurement value lt 255 the value of PCH LED2 imit Check the value of PCH LED1 2 If the value is between 80 and 240 complete the DISPLAY gt DENS gt D CRNT P dark current remedy If not execute xx84 remedy measurement value lt 30 xx82 Error in Patch Sensor Center dark current lower 1 Check if the Patch Sensor Connector is Error in Patch Sensor Rear dark current lower 1 Execute the remedy same as for xx82 limit physically removed imit Check the value of PCH LED3 DISPLAY gt DENS gt D CRNT P dark current 2 Replacement due to sensor failure DISPLAY gt DENS gt D CRNT P dark current measurement value lt 30 Execute FUNCTION gt MISC P gt PT LPADJ measurement value lt 30 Select DISPLAY gt DENS gt PCH LED2 and check Error in Patch Sensor Front dark current upper 1 Execute the remedy same as for xx83 hi imit Check the value of PCH LED1 the value of PCH LED2 If the value is between 80 DISPLAY gt DENS
11. g the aforementioned Service Mode 1 5 Attach the label for the new Patch Image Sensor to the Front Door 6 After Replacing or Cleaning the Patch Image Sensor execute FUNCTION gt MISC P gt PT LPADJ this adjusts the initial volume of reflective light for Patch Image Detection 7 Select DISPLAY gt DENS gt PCH LED1 2 3 and check the value of PCH LED1 2 3 If the values are between 80 and 240 complete the work 8 If the value is not between 80 and 240 replace the harness and repeat the process starting with the execution of FUNCTIONS gt MISC P gt PT LPADu 9 Recheck the appropriate LED values in DISPLAY gt DENS gt PCH LED1 2 3 NOTE Replacement of the Developing Assembly is NOT necessary at this time Photosensitive Drum Unit The E020 Detail Codes associated with the Photosensitive Drum Unit are XX85 XX90 and XX93 Although these Detail Codes indicate a Patch Image Sensor Error the reality is that a malfunction of components in the Drum Unit can generate the Patch Image Sensor Detail Codes DPOT K Verify that the value for DPOT K is within a reasonable range 400 to 950 Use COPER gt DISPLAY gt DPOT K to monitor this value during the print process Electrical Arcing An Electrical Arc caused by a broken Corona Wire or scratches on the Photosensitive Drum from worn ends are some of the occurrences which can lead to a fault in Potential Control causing Developer depletion and ultimately re
12. gt D CRNT P dark current and 240 complete the remedy measurement value gt 90 xx83___ Error in Patch Sensor Center dark current upper 1 Replacement due to sensor failure Error in Patch Sensor Rear dark current upper 1 Execute the remedy same as for xx83 limit Execute FUNCTION gt MISC P gt PT LPADJ imit Check the value of PCH LED3 DISPLAY gt DENS gt D CRNT P dark current Select DISPLAY gt DENS gt PCH LED2 and check DISPLAY gt DENS gt D CRNT P dark current measurement value gt 90 the value of PCH LED2 lf the value is between 80 measurement value gt 90 and 240 complete the remedy Error in patch image density lower limit 1 Check DISPLAY gt DENS gt SPL LG Y MC K 2 If not replace the harness and execute PT During printing DISPLAY gt DENS gt DENS S gt Check that the value is 00 then go to step 2 LPADJ Y MC K patch image measurement value lt 16 2 Replace the Patch Sensor patch density is too high 3 Replace the Potential Sensor Te Or SNE SINCE foun arn AEAN urpas PO Erorien imag dey oner ini GfeX OSPLATSDENESGPLTG VATOR During printing DISPLAY gt DENS gt DENS S gt If all values are more than 01 check toner measurement value Select DISPLAY gt DENS gt PCH LED2 and check Y M C K patch image measurement value gt _ level of the Toner Cartridge and Hopper DISPLAY gt DENS gt D CRNT P dark current the value of PCH LED2 1 880 patch density is too low 2 Check if the Hooper Toner Level Se
13. ng print for solid black image in monochrome mode 11 x 17 Execute 20 sheets of duplexing print for solid white image in monochrome mode 11 x 17 Exit Service Mode and select User Mode gt Auto Gradation Correction Execute Auto Gradation Correction full adjust according to the instruction on the display NOTE DO NOT perform INISET or INIT after replacing the Starter or the Developing Assembly If INISET or INIT is performed the initial value of the toner density signal will be set with erroneous data due to staining that occurs on the surface of the ATR Sensor The ONLY time to perform INISET or INIT on the imagePRESS C1 imagePRESS C1 Series is when the ATR Sensor Unit and the Developing Assemblies or the starters are replaced at the same time imagePRESS C1 C1 Developer Assemblies Starter Toner and Drum imagePRESS C1 C1 Developer Assemblies amp Drum COLOR DEVELOPER ASSEMBLIES DRUM ITEM No YELLOW FM3 1211 000 CYAN Fm8 1213 000 Sibpenuena BLACK FM3 1214 000 CLEAR FM3 8360 000 Using PG 10 to Help Identify E020 Problems The imagePRESS C1 C1 has multiple PG PRINT types Each test print can be used to detect image faults PG 10 MCYBk Lines is most often used to check the dark area density of each color and balance amongst each color 1 Solid density of each color and balance among each color or unevenness from the front to rear Check to ensure density is not extremely light or varying from one en
14. nsor measurement value lt 30 2 After removing the Patch Sensor Shutter Connector is physically removed execute FUNCTION gt MISC P gt PT LPADuJ 3 Replace the Patch Sensor Select DISPLAY gt DENS gt PCH LED2 and check 4 If the value of DISPLAY gt DPOT gt PT LPW the value of PCH LED2 2 Y MC K is more than 250 3 If 1 is more than 240 and 2 is between 80 1 Clean the Dustproof Glass and check and 240 replace the shutter and solenoid Then 2 Replace the Laser Scanner Unit clean execute PT LPADJ again if the value is inside and the Dustproof Glass between 80 and 240 complete the remedy If not 5 Replace the Potential Sensor go to step 4 6 Replace the drum Anter replacing Ine Pateh Sensor execute t xx92 Error in developer density lower limit 1 Execute the remedy same as for xx91 EP ADS Ifthe value is between 80 and 240 The value of DISPLAY gt DENS gt DENS S Y MC K complete the remedy 4 patch image measurement value is less than xx85 Patch image sampling center error 1 1 Execute the remedy same as for xx84 5 3 times in a row DISPLAY gt DENS gt DENS S Y MC K patch image xx93 Error in developer density lower limit 1 Execute the remedy same as for xx90 measurement value DISPLAY gt DENS gt D CRNT P dark current measurement value lt 30 The value of DISPLAY gt DENS gt DENS S Y IM C K patch image measurement value is less than 5 3 times in a row xx85 xx90 and
15. oner Supply 1 Video Count 2 Data from the Patch Image Sensor PS3 3 Data from the ATR Sensor PS7 Video Count ATR Sensor PS7 A Patch Image BY Sensor PS3 J h gt Sv Gr Hy O Video Count The Video Count monitors each document output when printing Calculations made on the Main Controller PCB estimate the amount of Toner consumption from the Video Count data and then in conjunction with the other methods of data collection it calculates the amount of Toner actually consumed Patch Image Sensor PS3 The Patch Image Sensor measures the Toner image formed on the Photosensitive Drum This function is performed sheet to sheet and based on the data collected the amount of Toner supplied is adjusted so the overall image density will achieve the target density ATR Sensor PS7 The ATR Sensor detects the Developer Toner mix on the Developing Cylinder for Y M C L ATR detection occurs every eight 8 color prints output on Letter 8 x 11 paper If the results fall outside of the target Developer Toner mix range Toner supply will be either increased or decreased to achieve the target Developer Toner mix range Identifying the Source of E020 Error Codes e Error Code EQ20 xxyy can be generated by a number of components associated with the creation of the Electrostatic Latent Image and the Development Process e Components including the ATR Sensor PS7
16. r Sensor If one or more of the values is incorrect exchanging the position of the faulty sensor with a working one is a quick way to check for a faulty sensor If the faulty sensor moves obviously the problem is the sensor If the faulty sensor does not move you should suspect a problem in the wiring or electronic components PCB s NOTE If one or more the Sensors in the Patch Image Sensor are defective a new Patch Image Sensor Assembly should be installed Troubleshooting the Patch Image Sensor e Check the operation of the Patch Image Sensor Solenoid SL8 using the Part Check Function in Service Mode After enabling the Solenoid in Service Mode it s operation can be verified by listening for clicks made by the activation and deactivation of the component same as the ATR Sensor on page 15 e Check the Patch Image Sensor Shutter to make sure it moves freely and that the Front Center and Rear Sensors and the Sensor Windows are clean e Inspect the Slide Rod FC6 1043 010 for damage Broken Slide Rod 20 When Replacing or Cleaning the Patch Image Sensor 1 After replacing the Patch Image Sensor do not forget to enter the four digit label values for each Sensor in Service Mode COPIER gt ADJUST gt DENS gt ALF F C R The Patch Image Sensor comes with the three 3 correction value labels The labels contain correction values for the front center and rear sensors 4 Enter the 4 digit label values 1 usin
17. sembly Developer Assemblies Photosensitive Drum Unit Toner Supply Patch Image Sensor ATR Sensor Main Controller or DC Controller Cleaning Maintenance and Scheduled Parts Replacements Canon U S A Inc cannot emphasize enough that proper cleaning maintenance and scheduled parts replacements are the most effective way to minimize the occurrence of E020 xxyy Error Codes Carefully monitoring the on board counters for durables and consumables and replacing them in a timely manner reduces downtime and repeat service visits while increasing productivity and profitability ATR and Patch Image Sensor e Optimal performance of the ATR and Patch Image Sensors plays a significant role in the prevention of E020 Error Codes e Recommended cleaning intervals are minimum standards Low copy volume engines may require cleaning at a more frequent copy count interval e To ensure the correct operation of the engine more frequent cleaning of these components may be necessary depending on environmental and operating conditions ATR Control and E020s ATR Control is executed to supply the correct amount of Toner to each individual Developing Assembly Toner supply is achieved by calculating the Toner consumption and the amount of Toner to supply The amount of Toner supplied to each Developing Assembly is calculated by data collected in three different ways Toner Supply Calculation The three 3 components in calculating T
18. sulting in E020 Error Codes Drum Reset E020 Error Codes can also occur after replacing the Photosensitive Drum ATR control is activated at the time of power on after the Photosensitive Drum is replaced At this time the Potential Control for patch detection becomes active Potential Control adjusts the Laser intensity in accordance with the new Photosensitive Drum in order to improve the accuracy of the patch detection However depending on the degree of deterioration of the old Photosensitive Drum if the difference of Photosensitive Drum sensitivity is large between the old Photosensitive Drum and the new Photosensitive Drum the protective function intervenes in the adjustment of Laser intensity and the Laser intensity may not be optimized As a result of the latter it may falsely detect a patch detection fault and trigger the ATR Sensor error E020 XXXX If this is suspected set the appropriate Laser intensity for the new Photosensitive Drum with this procedure 1 Turn the main power OFF ON 2 Execute the Service Mode COPIER gt FUNCTION gt DCP gt DRM RESET 3 If the error reoccurs after turning the main power OFF ON again execute step 1 and 2 up to five 5 times Developer Assembly The readings from the Patch Image Sensor PS3 and the ATR Sensor PS7 can be affected by the fluidity of the Start Developer and the Toner inside the Developer Assembly As a result of contamination or the Developer Cylinder being rotated in
19. tail Codes range from XX10 to XX13 XX81 to XX93 XXC1 XXDA and XXDB Clean the Patch Image Sensor 75 000 50 000 Prints Prints Check the Shutter the Spring and the Black Foam for wear and replace the Shutter or the entire Sensor if necessary Black Foam Clean the Front Center and Rear Sensor Wi IS Patch Image Sensor with the cover removed 18 Troubleshooting the Patch Image Sensor Check the CP PRINT specifically DISPLAY gt DENS gt DENS S Y M C K DENS S L and DENS Y M C and DENS L DISPLAY gt DENS Calculated Value of DENS 2 30 Density to Target DENS M 3 40 amp i ENS C 2 90 3 Difference displayed in PENS C 90 DENS S Y 338 DENS 5 M 358 Higher Lighter Current Status B DENS S C 364 Lower Darker DENS S K 357 D TRGT 336 Target D M TRGT 355 D C TRGT 346 DENS Y M C L Calculated value of Developer density Y M C L NOTE An E020 can result when an abnormal value 5 is displayed for DENS Y M C L Deterioration of the Developer dirt on the Patch Image Sensor Window or failure of the Patch Image Sensor may be to blame Check the CP PRINT readings in COPIER gt DISPLAY gt DENS gt PCH LED1 2 3 If the value for the Front Center or Rear Sensor is 0 this is a clear indication that the sensor assembly or its wiring is faulty If the values rise to around 240 it could indicate a very dirty sensor DISPLAY gt DENS 8 Front Sensor 134 Center Sensor PCH LED3 127 Rea
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