Lexmark C736 Service Manual
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Diagnostic information2-135 5026 Go Back Previous Next 5Check the high voltage contact from the HVPS to the photoconductor charge roll. Ensure the contact springs are properly mounted and that the charge roll contact spring is making good contact with the HVPS spring that runs through the left printer frame to view the proper mounting and for removal procedures. Are the spring(s) defective?Replace the transfer contact assembly.Go to step 6. 6Turn off the printer and check the continuity of the HVPS cable.Go to step 7. Replace the cable assembly. Is there continuity? 7Replace the HVPS. See “High-voltage power supply (HVPS) removal” on page 4-108. Did this fix the problem?Problem solved. Go to step 8. 8Replace the printhead. See “Printhead removal, installation, and adjustment” on page 4-135. Did this fix the problem?Problem solved. Replace the system board. See “System board removal” on page 4-153. Step Questions / actions Yes No High voltage contact pathHigh voltage power supply Pin 24 Pin 23 Pin 1 Pin 2Pin 2Pin 1Pin 23 Pin 24
2-136Service Manual 5026 Go Back Previous Next Print quality—blurred or fuzzy print Blurred or fuzzy print is usually caused by a problem in the EP drive assembly or in the transfer module. Check the EP drive assembly and transfer module for correct operation. Blurred print can also be caused by incorrect feeding from one of the input paper sources, paper trays, or duplex paper path. Check the high voltage spring contacts to ensure they are not bent, corroded, or damaged. Replace as necessary. Print quality—half-color page A photoconductor unit is not properly seated. Reset the specific photoconductor unit. Print quality—horizontal banding Print quality—horizontal line The photoconductor unit is defective. Replace the photoconductor unit. Print quality—insufficient fusing Print quality—missing image at edge Reseat the developer cartridge. Print quality—mottle (2–5mm speckles) Keep running prints through, and the problem normally clears up. If the problem persists, replace the developer cartridge. Print quality—narrow vertical line Step Questions / actions Yes No 1Measure the distance between repeating bands. Is the distance between bands either 27 or 36mm?Replace the print cartridge. Replace the photoconductor unit. See “Photoconductor unit removal” on page 4-132. Step Questions / actions Yes No 1Is the fuser properly installed? Go to step 2. Install the fuser properly. 2Replace the fuser. See “Fuser removal” on page 4-104. Does this fix the problem?Problem solved. Replace the LVPS. see “Low-voltage power supply (LVPS) removal” on page 4-112. Step Questions / actions Yes No 1Replace the photoconductor unit. See “Photoconductor unit removal” on page 4-132. Problem solved. Replace the print cartridge.
Diagnostic information2-137 5026 Go Back Previous Next Print quality—random marks Service tip: The primary cause of random marks is due to loose material moving around inside the printer and attaching to the photoconductor unit, developer roll, or transfer module. Print quality—residual image Service tip: Install a new print cartridge if available before doing this service check. Residual image can be caused by the photoconductor, cleaning blade, and other parts inside the print cartridge. Step Questions / actions Yes No 1Is there any loose or foreign material on the photoconductor unit?Replace the photoconductor unit. See “Photoconductor unit removal” on page 4-132.Go to step 2. 2Is there any loose or foreign material on the cartridge roll?Replace the print cartridge. Go to step 3. 3Is there any loose or foreign material on the transfer module?Replace the transfer module. See “Transfer module removal” on page 4-168.Contact your next level of support. Step Questions / actions Yes No 1Is there any toner contamination on the fuser assembly?Replace the fuser. See “Fuser removal” on page 4-104.Contact your next level of support.
2-138Service Manual 5026 Go Back Previous Next Print quality—solid color page Service tip: A solid color page is generally caused by a problem in the high voltage system or an incorrect high voltage in the printing process resulting in toner development on the entire photoconductor drum. Step Questions / actions Yes No 1Replace the photoconductor unit for the color in question. Does this fix the problem?Problem solved. Go to step 2. 2Check the high voltage contact from the HVPS to the photoconductor charge roll. Ensure the contact springs are properly mounted and that the charge roll contact spring is making good contact with the HPVS spring that runs through the left printer frame to view the proper mounting and for removal procedures. Are the spring(s) defective?Replace the transfer contact assembly.Go to step 3. 3Turn the printer off, and then check the continuity of the HVPS cable.Go to step 4. Replace the cable assembly. Is there continuity? Note: Printer is shown with components removed for clarity High volt power supply High volt contact path Pin 24 Pin 23 Pin 1 Pin 2Pin 2Pin 1Pin 23 Pin 24
Diagnostic information2-139 5026 Go Back Previous NextPrint quality—vertical banding Replace the developer cartridge. Print quality—white gapping 4Replace the HVPS. See “High-voltage power supply (HVPS) removal” on page 4-108. Did this solve the problem?Problem solved. Replace the system board. See “System board removal” on page 4-153. Step Questions / actions Yes No 11. Open the front cover. 2. Remove the toner cartridge base on the color of the print quality defect. 3. Inspect the cartridge guide for damage or obstructions. Clear any obstructions. 4. Inspect the cartridge guide wheel if its dislodged or damaged. Is the cartridge guide wheel damaged?Replace the cartridge guide wheel. See “Cartridge guide wheel removal” on page 4-54.Go to step 2. 21. Reinstall all the toner cartridge. 2. Ensure that the photoconductor units are installed correctly. 3. Reseat the photoconductor. 4. Perform a print test. Does this fix the problem?Problem resolved. Go to step 3. 31. Reseat JHVPS1 on the system board. 2. Reseat the other end of the cable located on the HVPS. 3. Check for cuts and damage on the HVPS cable. Is the HVPS cable damaged?Replace the HVPS cable. See “High-voltage power supply (HVPS) cable removal” on page 4-110.Go to step 4. 41. Check the metal contact on the left of the transfer module for any damage. 2. Check for any contamination, and clear any contaminants with a piece of cloth. Are the transfer module contacts damaged?Replace the transfer module. See “Transfer module removal” on page 4-168.Go to step 5. 51. Open the front cover. 2. Check the spring contact that is in contact with the transfer module for any damage or contamination. Is the spring contact damaged?Replace the cartridge contact spring. See “Contact springs kit removal” on page 4-70.Go to step 6. 6Replace the toner cartridge. Does this fix the problem?Problem resolved. Go to step 7. 7Replace the suspected photoconductor units. Does this fix the problem?Problem resolved. Go to step 8. 8Replace the transfer module. Does this fix the problem?Problem resolved. Go to step 9. Step Questions / actions Yes No
2-140Service Manual 5026 Go Back Previous NextTray linking service check Tray linking is useful for large print jobs or multiple copies. When one linked tray is empty, paper feeds from the next linked tray. When the Paper size and Paper Type settings are the same for any trays, the trays are automatically linked. 91. Reseat the HVPS card. 2. Make sure the contacts is properly aligned with the HVPS. Does this fix the problem?Problem resolved. Replace the HVPS. See “High-voltage power supply (HVPS) removal” on page 4-108. Step Questions / actions Yes No 1Load the same size and type of paper in each tray. Move the paper guides to the correct positions for the paper size loaded in each tray. Does tray linking work properly?Problem resolved. Go to step 2. 2Print a menu settings page from the Admin Menu, and compare the settings for each tray. Are the settings for each tray to be linked the same for paper type and paper size?Problem resolved. In the Admin menus, set the same settings for paper size and paper type in each tray. Step Questions / actions Yes No
Diagnostic aids3-1 5026 Go Back Previous Next 3. Diagnostic aids This chapter explains the tests and procedures to identify printer failures and verify repairs have corrected the problem. There are different test menus that can be accessed during POR to identify problems with the printer. To run the printer diagnostic tests described in this chapter, you must put the printer in Diagnostics mode.Diagnostics menu 1. Turn off the printer. 2. Press and hold and . 3. Turn on the printer. 4. Release the buttons when the clock graphic displays.The Diagnostics menu group contains the settings and operations used while manufacturing and servicing the printer. See “Diagnostics menu” on page 3-2 for more information. Configuration menu 1. Turn off the printer. 2. Press and hold and . 3. Turn on the printer. 4. Release the buttons when the clock graphic displays.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 “Configuration menu (CONFIG MENU)” on page 3-24 for more information. Network SE Menu 1. While in Network/Ports Menu (Menus—Network/Ports— Standard Network—STD NET SETUP), press and hold and .The Network SE menu contains advanced network menu tools. SE Menu From browser, add “/se” to device’s IP address (e.g. http:// 158.183.3.2/se)
3-2Service Manual 5026 Go Back Previous Next Diagnostics menu Note: Tray 2 refers to the 550-sheet tray located in the 550-sheet option assembly. Diagnostics menu structure When the Diagnostics mode is entered, each Diagnostics main menu item displays on the operator panel. When a diagnostic test is selected from the main menu, a sub menu displays and each individual test displays in the order shown. Any options that are referred to in the menus are displayed when the option is installed. Available tests The tests display on the operator panel in the order shown: REGISTRATION Top Margin See “Registration” on page 3-5. Bottom Margin Left Margin Right Margin Skew See “Skew” on page 3-5. Quick Test See “Quick Test” on page 3-7. ALIGNMENT MENU Cyan See “Alignment” on page 3-8. Yellow Magenta Factory Scanner A summary page for all the color alignment settings. Can be used in place of alignment pages for each individual color. Factory Manual MOTOR TESTS (order differs depending upon model) Align Motor TestNote: Many of these tests require special conditions in order to successfully test the motors. See “General motor tests procedures” on page 3-9. Cart 1 Cart 2 Cart 3 CAM COD DUPLEX Fuser MPF Transfer Belt Option Motors Tray 1 Pickup
Diagnostic aids3-3 5026 Go Back Previous Next PRINT TESTS Tray 1 See “Input source tests” on page 3-10. Tray 2 (if installed) Tray 3 (if installed) Tray 4 (if installed) Tray 5 (if installed) Multi-Purpose Feeder Prt Quality Pgs See “Print quality test pages (Prt Quality Pgs)” on page 3-11. HARDWARE TESTS Panel Test See “Panel Test” on page 3-12. Button Test See “Button Test” on page 3-12. DRAM Test See “DRAM Test” on page 3-12. Serial 1 Wrap (if a serial port is available in the PCI slot 1)See “Serial 1 Wrap” on page 3-13. USB HS Test Mode See “USB HS Test Mode” on page 3-14. DUPLEX TESTS (if installed) Quick Test See “Quick Test (duplex)” on page 3-14. Print Test See “Print Test (duplex)” on page 3-15. Top Margin See “Top Margin (duplex)” on page 3-16. Left Margin See “Left Margin (duplex)” on page 3-16. Skew See “Skew (duplex)” on page 3-16. SENSOR TESTS Static Sensors See “Sensor Test” on page 3-17. Waste Toner Belt Waste Fuser Temp BUR Temp Power Dynamic Sensors Fuser Exit Input Front Door Narrow Media K Toner M Toner C Toner Y Toner TPS Bubble Other Sensors Bin Full Test PRINTHEAD TESTS Mirror Motor Test See “Mirror Motor Test” on page 3-18. Servo Laser Test See “Servo Laser Test” on page 3-18.
3-4Service Manual 5026 Go Back Previous Next DEVICE TESTS (if hard disk or flash is installed) Quick Disk Test See “Quick Disk Test” on page 3-18. Disk Test/Clean See “Disk Test/Clean” on page 3-19. Flash Test See “Flash Test” on page 3-19. PRINTER SETUP Defaults See “Defaults” on page 3-20. PAGE COUNTS See “Page Counts” on page 3-20. Prt Color Pg Count Prt Mono Pg Count Perm Page Count Serial Number See “Serial Number” on page 3-20. Engine Setting 1 through 4 See “Engine Setting 1 through 4” on page 3-20. Model Name See “Model Name” on page 3-20. Configuration ID See “Configuration ID” on page 3-20. Reset Color Cal See “Reset color calibration (Reset Color Cal)” on page 3-21. Par 1 Strobe Adj See “Parallel 1 strobe adjustment (Par 1 Strobe Adj)” on page 3-21. Motor Calibration See “Motor Calibration” on page 3-21. EP SETUP EP Defaults See “EP Defaults” on page 3-22. Fuser Temp See “Fuser temperature (Fuser Temp)” on page 3-22. DC Charge Adjust See “DC Charge Adjust, Dev Bias Adj, Transfer Adjust” on page 3-22. Dev Bias Adj Transfer Adjust REPORTS Menu Settings Page See “Menu Settings Page” on page 3-22. EVENT LOG Display Log See “Display Log” on page 3-22. Print Log See “Print Log” on page 3-23. Clear Log See “Clear Log” on page 3-23. EXIT DIAGNOSTICSThis selection exits Diagnostics mode, and Resetting the Printer displays. The printer performs a POR, and returns to normal mode.