Lexmark X 850 Owners Manual
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Diagnostic information2-223 7500-XXX Spots Step Check Yes No 1 Check the media condition. Load new, dry, recommended media. Re-print the defective image. Does the error continue?Go to step 2. Problem solved. 2 Check the media transfer route. Is the media route free of contamination or debris?Go to step 3. Remove debris or contamination. 3 Check the toner cartridge. Install a new toner cartridge. Re-print the defective image. Is the image density normal?Problem solved. Go to step 4. 4 Check the transfer roll assembly. Remove the transfer roll assembly. Is the transfer roll assembly rotating, and free of contamination, and wear?Go to step 5. Replace the transfer roll assembly. 5 Check the heat roll and the pressure roll. Remove the fuser unit assembly. Caution: Allow the fuser unit assembly to cool down. Is there contamination or cracks on the heat roll and/or the pressure roll?Replace the fuser unit assembly.Go to step 6. 6 Check the printer engine card assembly. Replace the printer engine card assembly. Perform a print test. Does the error continue?Problem solved. Replace the RIP card assembly. Go to “RIP card assembly removal” on page 4-128. Leading edge Trailing edge
2-224MFP Service Manual 7500-XXX After image The ghost appears on the media which, may be the image from the previous page or part of the page currently printing. Step Check Yes No 1 Check the media condition. Load new, dry, recommended media. Re-print the defective image. Does the error continue?Go to step 2. Problem solved. 2 Check the toner cartridge. Install a new toner cartridge. Re-print the defective image. Is the image density normal?Problem solved. Go to step 3. 3 Check the heat roll and the pressure roll. Remove the fuser unit assembly. Caution: Allow the fuser unit assembly to cool down. Is there contamination or cracks on the heat roll and/or pressure roll?Replace the fuser unit assembly.Go to step 4. 4 Check the printer engine card assembly. Replace the printer engine card assembly. Perform a print test. Does the error continue?Problem solved. Replace the RIP card assembly. Go to “RIP card assembly removal” on page 4-128. Leading edge Trailing edge
Diagnostic information2-225 7500-XXX Background (fog) Step Check Yes No 1 Check the media condition. Load new, dry, recommended media. Re-print the defective image. Does the error continue?Go to step 2. Problem solved. 2 Check the media transfer route. Is the media path free of contamination or debris.Go to step 3. Remove debris or contamination. 3 Check the toner cartridge. Install a new toner cartridge. Re-print the defective image. Is the image density normal?Problem solved. Go to step 4. 4 Check the transfer roll assembly. Remove the transfer roll assembly. Is the transfer roll assembly rotating, and free of contamination, and wear?Go to step 5. Replace the transfer roll assembly. 5 Check the image development process. Perform a print test. Turn off the printer power while printing. Carefully remove the PC cartridge, and check the toner image formed on the drum before the transfer roll assembly. Is the image completely formed on the drum and the area clear, black, and easily read?Go to step 6. Go to step 7. 6 Check the image transfer process. Check the toner image formed on the drum after the transfer roll assembly passed. Is the toner image completely transferred on the media?Go to step 8. Go to step 7. 7 Check the HVPS card assembly. Replace the HVPS card assembly. Perform a print test. Does the error continue?Problem solved. Go to step 8. Leading edge Trailing edge
2-226MFP Service Manual 7500-XXX 8 Check the printer engine card assembly. Replace the printer engine card assembly. Perform a print test. Does the error continue?Problem solved. Replace the RIP card assembly. Go to “RIP card assembly removal” on page 4-128. Step Check Yes No
Diagnostic information2-227 7500-XXX Skew The printed image is not paralleled with both sides of the media. Step Check Yes No 1 Check printer installation placement. Check the installation surface for irregularities. Check for missing printer foot. Is the setup surface normal?Go to step 2. Correct the installation placement. 2 Properly load media into the media tray assembly. Properly install the media tray assembly into the printer. Re-print the defective image. Does the error continue?Go to step 3. Problem solved. 3 Is the media transfer route and the media route free of contamination or debris?Go to step 4. Remove debris or contamination. 4 Check the drive rolls on the media transfer route. Check all rolls on the transfer route for contamination, wear or damage. Check whether the pinch rolls rotate freely and spring pressure is applied evenly. Are all drive rolls free of contamination, wear or damage?Go to step 5. Replace defective rolls. (Go to applicable repair procedures for replacement.) 5 Check the printer engine card assembly. Replace the printer engine card assembly Perform a print test. Does the error continue?Problem solved. Replace the RIP card assembly. Go to “RIP card assembly removal” on page 4-128. Leading edge Trailing edge
2-228MFP Service Manual 7500-XXX Media damage Step Check Yes No 1 Check printer installation placement. Check the installation surface for irregularities. Check for missing printer foot. Is the setup surface normal?Go to step 2. Correct the installation placement. 2 Check the media feed. Remove the media tray assembly. Properly load media in the media tray assembly. Properly install the media tray assembly in the printer. Re-print the defective image. Does the error continue?Go to step 3. Problem solved. 3 Check the media condition. Load new, dry, recommended media. Re-print the defective image. Does the error continue?Go to step 4. Problem solved. 4 Check the media transfer route. Is the media path free of contamination or debris?Go to step 5. Remove debris or contamination. 5 Check the drive rolls on the media transfer route. Check all rolls on the transfer route for contamination, wear or damage. Are the pinch rolls rotating freely and spring pressure applied evenly? Go to step 6. Replace defective rolls. (Go to applicable repair procedures for replacement). 6 Check the heat roll and the pressure roll. Remove the fuser unit assembly. Caution: Allow the fuser unit assembly to cool down. Is there contamination or cracks on the heat roll and/or the pressure roll?Replace the fuser unit assembly.Contact the technical engineer. Leading edge Trailing edge
Diagnostic information2-229 7500-XXX No fuse Step Check Yes No 1 Check the fuser unit assembly installation. Check that the levers, on both sides of the fuser unit assembly, are pushed down. Re-print the defective image. Does the error continue?Go to step 2. Problem solved. 2 Check the media condition. Load new, dry, recommended media. Re-print the defective image. Does the error continue?Go to step 3. Problem solved. 3 Check the heat roll and the pressure roll. Remove the fuser unit assembly. Caution: Allow the fuser unit assembly to cool down. Is there contamination or cracks on the heat roll and/or the pressure roll?Replace the fuser unit assembly.Go to step 4. 4 Check the image development process. Perform a print test. Turn off the printer power while printing. Carefully remove the PC cartridge, and check the toner image formed on the drum before the transfer roll assembly. Is the image completely formed on the drum and the area clear, black, and easily read?Go to step 5. Go to step 7. 5 Check the image transfer process. Check the toner image formed on the drum after the transfer roll assembly is passed. Is the toner image completely transferred on the media?Go to step 7. Go to step 6. 6 Check the HVPS card assembly. Replace the HVPS card assembly. Perform a print test. Does the error continue?Problem solved. Go to step 7. Leading edge Trailing edge
2-230MFP Service Manual 7500-XXX 7 Check the printer engine card assembly. Replace the printer engine card assembly. Perform a print test. Does the error continue?Problem solved. Replace the RIP card assembly. Go to “RIP card assembly removal” on page 4-128. Step Check Yes No
Diagnostic aids3-1 7500-XXX 3. Diagnostic aids This chapter explains the tests and procedures to identify printer failures and to verify that repairs have corrected the problem. Accessing service menus Access the following menus to identify problems with the printer and run diagnostic tests. Diagnostics Menu 1. Turn off the printer. 2. Press and hold the 3 and 6 buttons simultaneously. 3. Turn on the printer. 4. Release the buttons after 10 seconds.The Diagnostics Menu group consists of menus, settings, and operations that are used to diagnose various printer problems. Note: While the Diagnostics Menu Group is active, all host interfaces are offline. See “Entering Diagnostics Menus” on page 3-2 for more information. Configuration Menu 1. Turn off the printer. 2. Press and hold the 2 and 6 buttons simultaneously. 3. Turn on the printer. 4. Release the buttons after 10 seconds.The Configuration Menu group contains a set of menus, settings, and operations which are infrequently required by a user. Generally, the options made available in this menu group are used to configure a printer for operation. See “Entering Configuration Menu” on page 3-33 for more information.
3-2MFP Service Manual 7500-XXX Diagnostics Menus Entering Diagnostics Menus 1.Turn off the printer. 2.Press and hold the 3 and 6 buttons simultaneously. 3.Turn on the printer. 4.Release the buttons after 10 seconds. Available tests Tests appear on the LCD in the order shown: MOTOR TESTSSee “MOTOR TESTS” on page 3-5. Finisher Motor Tests Sub paddle solenoid Media eject clutch Stapler unit mtr Bridge unit drv mtr Motor (entrance/paddle) Motor (buffer/transport) Motor (exit) Media eject clamp mtr Media eject mtr Punch unit mtr Fin diverter solenoid Fin Buffer solenoid Punch carriage shift mtr Front tamper mtr Rear tamper mtr Stapler carriage mtr Stacker lift mtr Printer Motor Tests Transport mtr 2TM/TTM drv mtr 2TM/TTM Clutch HCF transport mtr HCF pick solenoid MPF/Transport mtr Fuser cooling fan PC unit cooling fan Toner add mtr Drum unit Registrat clutch