Lexmark C760 Service Manual
Have a look at the manual Lexmark C760 Service Manual online for free. It’s possible to download the document as PDF or print. UserManuals.tech offer 166 Lexmark manuals and user’s guides for free. Share the user manual or guide on Facebook, Twitter or Google+.
Diagnostic information2-125 5060-4xx Operator panel LCD/status LED/buttons service check Use this service check to check both the operation of the panel buttons and to test the LCD display for correct operation. Replace the operator panel assembly if the LCD display functions normally, but the LED does not come on. If one or more of the operator panel buttons do not operate correctly, go to “Step A.” If any of the following symptoms occur, go to “Step B” on page 2-135. Operator panel LCD is blank/power on/status LED off Operator panel LCD is blank/power on/status LED on Operator panel LCD displays all diamonds/5 beeps/power on/status LED on Step A Step B Note: Make sure the operator panel cable is seated firmly in J1 on the system board before proceeding with this step. Step Action and questions Yes No 1 Buttons Test - Perform the “Button Test” on page 3-20 . Do any or all of the buttons fail to operate correctly? Note : If all the buttons fail to operate correctly, the LCD display is blank, power on status LED is on, and the printer beeps 5 times, go step B. Replace the “Operator panel” on page 4-53 Test passes. No problem found Step Action and questions Yes No 1 LCD Test - Perform the “LCD Test” on page 3-20 . Can you run the test? Go to step 2 Go to step 4 2LCD Test - Does the test pass? Problem solved Go to step 3 3Operator panel - Is the operator panel operating correctly except for a few pels missing or broken? Replace the “Operator panel” on page 4-53Go to step 4 4Operator panel assembly -Is the operator panel assembly completely blank and the power on status LED off? Go to step 6 Go to step 5 5Operator panel assembly - Is the operator panel assembly completely blank and the power on status LED on?Go to step 10 Go to step 12 6Does the printer beep 5 times? Go to step 7 Replace the “Operator panel” on page 4-53 7System board - Measure the voltage at connector J6-2 on the “System board” on page 5-8 . The voltage measures approximately +5 V dc. Is the voltage correct? Replace the “Operator panel” on page 4-53 Go to step 8
2-126Service Manual 5060-4 xx 8Operator panel cable (operator panel connection) - Make sure that the operator panel cable is seated correctly in the connector on the operator panel board. Is the cable seated correctly?Go to step 9 Seat the cable correctly 9Operator panel cable - Check continuity of the operator panel cable. Is there continuity? Replace the “System board” on page 4-72 Go to “Operator panel” on page 4-53 and replace the operator panel cable 10System board - A poor ground connection between pin J6-4 on the operator panel board connector can cause this symptom. Check for continuity between pin J6-4 and ground on the board. Go to “System board” on page 5-8 . Is there continuity? Go to step 11 Replace the “System board” on page 4-72 11Operator panel cable - Check continuity of the operator panel cable. Is there continuity? Replace the “Operator panel” on page 4-53Go to “Operator panel” on page 4-53 and replace the operator panel cable 12Operator panel assembly - Does the operator panel display all diamonds, with the power on/status LED on and 5 beeps? Go to step 13 Call your next level support 13Voltage checks at system board connector J6 - Go to “System board” on page 5-8 . Check the voltages on connector J6 as shown: Are the voltages correct? Replace the “Operator panel” on page 4-53 Go to step 14 14Operator panel cable - Check continuity of the operator panel cable. Is there continuity? Replace the “Operator panel” on page 4-53Go to “Operator panel” on page 4-53 and replace the operator panel cable Step Action and questions Yes No Connector pin Voltage (display static) Voltage (display active - LCD Test running) J6-1 +5 V dc Voltage varies 1.0 to 2.0 V dc J6-2 +5 V dc +5 V dc J6-3 +5 V dc Voltage varies 1.0 to 2.4 V dc J6-4 Ground Ground J6-5 +5 V dc +5 V dc
Diagnostic information2-127 5060-4xx Output expander option service check Note: The majority of the mechanical components can be observed during operation by removing the covers. The output expander functions without the covers installed. Make sure the option is correctly installed before attempting to service the unit. Step Symptoms Yes No 1 The printer does not recognize one or more output expander options as being installed. Go to “Printer does not recognize that one or more output options as being installed.” on page 2-128 Go to step 2 2202 Paper Jam Open Rear Door message appears. A sheet of paper is jammed prior to the pass thru sensor flag or a sheet of paper feeds out to the standard bin even though bin x is selected. Paper exits half way out of the redrive. Go to “202 Paper Jam” on page 2-71 Go to step 3 3Remove paper - Output Bin x is displayed, POST is incomplete, unable to clear the message. Go to “Remove Paper - Output Bin x is displayed, POST is incomplete unable to clear the message.” on page 2-128 Go to step 4 4271 Paper Jam - Check Bin x, POST incomplete. Go to “POST incomplete” on page 2-81 Go to step 5 5271 Paper Jam - Check Bin x, POST complete, first sheet of paper feeds into output bin x. Go to “271 Paper Jam - check bin 1” on page 2-80 Go to step 6 6No indication that bin x is full OR No indication that bin x is near full. Go to “No indication that bin x is full or no indication that bin x is near full.” on page 2-129 Go to step 7 7990 Service - Bin x Go to “For 990 Service Error - Tray x, x=Tray 2, 3, 4 or 5, this is the tray that has a problem or needs service.” on page 2-96 Call your next level support
2-128Service Manual 5060-4 xx Printer does not recognize that one or more output options as being installed. Remove Paper - Output Bin x is displayed, POST is incomplete unable to clear the message. Step Actions and questions Yes No 1 Excessive static electricity buildup - Check the output expander control board cover to make sure the ESD brush ground lead is firmly attached to the output expander frame. Make sure the ESD brush is not loose or damaged. is the ESD brush ground cable correctly installed and the ESD brush not loose or broken? Go to step 2 1. Attach the ground cable if not installed correctly. 2. Replace the cover assembly if the ESD brush is loose or damaged. 2Output expander assembly mechanical linkage (cables) - check the output expander autoconnect cable and connector for any signs of damage, especially the connector pins. Are there any signs of damage to the cable, connector, or connector pins? Replace the autoconnect cable Go to step 3 3Output expander assembly mechanical linkage (electrical) - Check the cables at J1A, J1B, J2A and J2B on the control board to make sure they are attached securely and correctly. Are the cables attached securely and correctly? Go to step 4 Reseat the cables 4Voltage check, base printer autoconnect connector - Turn the power off and remove the output expander option from the printer and check the voltages on the base printer top autoconnect connector. Go to “Connectors” on page 5-6 . Are the voltages correct? Go to step 5 The problem is in the base printer. Check autoconnects in the printer. 5Voltage check, output expander system board - Reinstall the output expander option and check the voltages at J1A and J1B on the connector. Are the voltages correct? Replace the output expander option system board Replace the output expander option mechanical linkage assembly Step Actions and questions Yes No 1 Output sensor flag check - Check the flag for correct operation, binds, broken parts, or interference from the sensor cable. Is there a problem with the sensor flag? Replace the flag or repair as necessary Go to step 2 2Output bin sensor -Run the sensor test to check the Output bin sensor for correct operation. Does the sensor operate correctly? Call your next level support Replace the sensor assembly. If this does not fix the problem replace the “System board” on page 4-72 .
Diagnostic information2-129 5060-4xx No indication that bin x is full or no indication that bin x is near full. Problems with excessive static electricity buildup. Step Actions and questions Yes No 1 Sensor cable installation - Check for correct installation of the sensor cable at J5 on the control board. Is the cable installed correctly? Go to step 2 Install the cable correctly 2Dual output bin x sensor assembly Do either the bin x full or the bin x near full sensor fail the sensor test? Go to step 3 Call your next level support 3Voltage - Check the voltages at J5-3 and J5-4. The voltages should measure approximately +5 V dc. Are the voltages correct? Replace the sensor Replace the control board Step Action and Questions Yes No 1 Excessive static electricity buildup. Front cover assembly - check the front cover assembly to make sure the ESD brush ground lead is firmly attached to the Output Expander frame or the ESD brush is not loose or damaged. Is the ESD brush ground cable correctly installed and is the ESD brush loose or broken? Make sure the brush is contacting the media being fed through the option 1. Attach the ground cable if not installed 2. Replace the cover assembly if the ESD brush is loose or damaged
2-130Service Manual 5060-4 xx Print quality service check Note: This symptom may require replacement of one or more CRUs (Customer Replaceable Units) designated as supplies or maintenance items, which are the responsibility of the customer. With the customers permission, you may need to install an ITU, fuser assembly, second transfer roll, or print cartridge. Check the following before proceeding with any of the print quality service checks. Use tray 1 (internal tray) to test the print quality of the base printer. Be sure the fuser assembly is installed correctly. Be sure the ITU assembly is installed correctly. Be sure the second transfer roll is installed correctly. Check the media in tray 1 to make sure it meets paper specifications. Run a copy of the CE Test page. This sets all the printer defaults to the correct settings to check for print quality. If a specific color has a print quality problem, first try a new cartridge to help isolate the problem. An incorrect printer driver for the installed software, can cause print quality problems. Incorrect characters could print and the copy may not fit the page correctly. Note: Some 201 Paper Jam errors can be caused by a faulty print cartridge. Blank page (no image) If there is no image (blank page) and no error codes displayed, go to step 1. If there is no image (blank page) but error codes are displayed, go to “Sub error code table” on page 2-18 and perform the necessary action. Step Action and questions Yes No 1 Second transfer roll - Make sure the second transfer roll is installed and correctly installed. Is the second transfer roll correctly installed? If a second transfer roll is not installed, install a new one.Go to step 2 2Second transfer roll release lever - Make sure the second transfer roll release Lever is not stuck in the down position. Check for broken or damaged parts. Is the second transfer roll release lever operating correctly? Go to step 3 Repair as necessary 3Check continuity of the second transfer roll to the transfer HVPS cable. Is there continuity? Replace the “Transfer HVPS board” on page 4-73Replace the cable
Diagnostic information2-131 5060-4xx Entire page is mostly one color—Full bleed planes in one color Some printing may appear in other colors. This applies to black, cyan, magenta and yellow. Step Action and questions Yes No 1 Using a piece of paper, block the laser path between the printhead and cartridge for the color that is experiencing the full bleed issue. Go to step 2 Go to step 4 2Turn the printer off. Check the cable connections between the printhead and the system board. Does the issue still persist?Go to step 3 Problem solved 3Use the “Printhead diagnostics” on page 3-1 and the “Card assembly, printhead diagnostic aid” on page 7-13 to switch video cables between the printhead of the full bleed color and another color. Does the color of the full bleed plane stay the same? Replace the printhead (see “Printhead removal and adjustments” on page 4-60 .)Replace the “System board” on page 4-72 . 4Change or switch the cartridge of the color that is experiencing the issue. Does the issue persist? Go to step 5 Replace the cartridge. 5Cartridge contact assembly - Check the cartridge contact block. Make sure the PC drum contact pin is not stuck. See “Cartridge contact assembly pin locations (cyan, magenta and yellow)” on page 5-4 to identify the PC drum contact pin. Does the pin operate correctly? Go to step 6 Replace the “Cartridge contact assembly” on page 4-29. 6Turn the printer off. Check the cable connections between the developer HVPS board and the system board. Does the issue persist? Go to step 7 Problem resolved 7Perform a continuity check on the developer HVPS cable. Does the cable check out? Replace the FRUs in the following order: 1. “Developer HVPS board” on page 4-31 . 2. “System board” on page 4-72 .Replace the developer HVPS cable.
2-132Service Manual 5060-4 xx Missing colors—Complete or partially missing color planes If a color or colors are missing, or a color is partially missing, go to “If cyan, magenta, and yellow is missing, go to “Black and white only—cyan, magenta, and yellow are missing” on page 2-133.” on page 2-132 . If cyan, magenta, and yellow is missing, go to “Black and white only—cyan, magenta, and yellow are missing” on page 2-133 . Step Action and questions Yes No 1 Print cartridge - Make sure the cartridge is seated properly and that all packing material has been removed from the cartridge. Has all packing material been removed? Is the cartridge seated correctly? Go to step 2 Remove packaging and seat cartridge 2Inspect each of the transfer roll bellcranks. Were any of the bellcranks broken? Replace the broken bell cranks.Go to step 3 3Perform the partial print test. See “Par tial Print Test” on page 3-6 . Is the image well developed on the PC drum but the same plane is missing or faded on the ITU belt? Go to step 4 Go to step 6 4Turn off the printer. Check the cable connections between the transfer HVPS board and the system board. Does the issue persist?Go to step 5 Problem resolved 5Check continuity on the cable between the respective rear bellcrank and the lead on the transfer HVPS board. Is there continuity? Replace in the following order: 1. “Transfer HVPS board” on page 4-73 2. “Cartridge contact assembly” on page 4-29 3. “System board” on page 4-72 .Replace the FRUs in the following order: 1. Cable 2. FTR spring. 6Change or switch failing cartridge. Does the issue persist? Go to step 7 Replace the cartridge. 7Cartridge contact assembly - Check the cartridge contact block. Make sure the PC drum contact pin is not stuck. See “Cartridge contact assembly pin locations (cyan, magenta and yellow)” on page 5-4 to identify the PC drum contact pin. Does the pin operate correctly? Go to step 8 Replace the “Cartridge contact assembly” on page 4-29.
Diagnostic information2-133 5060-4xx Black and white only—cyan, magenta, and yellow are missing Light print over the entire page If all colors have light print, go to “All colors have light print over the entire page” on page 2-133 . If only one color has light print, go to “One color has light print over the entire page” on page 2-134 . All colors have light print over the entire page 8Perform a continuity check on the developer HVPS cable. Does the cable check out?Replace in order: 1. Developer HVPS board. See “Developer HVPS board” on page 4-31 . 2. System board. See “System board” on page 4-72 . Replace the developer HVPS cable. Step Action and questions Yes No 1 Check the Print Mode setting in the Color Menu. Is the Print Mode set to Black &White? Change the setting to Color. Go to step 2 2Ask the user or network administrator to check if the correct color driver is installed. Is the correct color driver installed Install the correct color driver. Go to “Black only retract (BOR) service check” on page 2-109 . Step Action and questions Yes No 1 Replace the “Second transfer roll” on page 4-71 . Does the light print persist? Go to step 2 Problem resolved 2Turn the printer off. Check the cable connections between the transfer HVPS board and the system board.Go to step 3 Problem resolved 3Check continuity on the cable between the rear second transfer roll arm and the 1 lead on the transfer HVPS board.Replace the “Transfer HVPS board” on page 4-73 . Check the connection at the second transfer roll arm. Step Action and questions Yes No
2-134Service Manual 5060-4 xx One color has light print over the entire page Vertical lines or streaks Horizontal lines or streaks If the horizontal marks or lines repeat at evenly-spaced intervals, use the “Print quality defect locator chart” on page 3-4 to determine the part to be replaced. For lines or marks appearing at random intervals, go to step 1. Step Action and questions Yes No 1 Print cartridge - Make sure the cartridge is seated properly and all packaging material is removed from the cartridge. Has all packaging material been removed and the cartridge seated correctly? Go to step 2 Remove the packaging material and seat the cartridge. 2Print cartridge - The cartridge may be out of toner. Change or switch the cartridge. Does the issue persist? Go to step 3 Problem resolved 3Cartridge contact assembly - Check the cartridge contact block. Make sure the PC drum contact pin is not stuck. See “Cartridge contact assembly pin locations (cyan, magenta and yellow)” on page 5-4 to identify the PC drum contact pin. Does the PC drum contact pin move freely? Replace the FRUs in the order shown: “Cartridge contact assembly” on page 4-29 . “Developer HVPS board” on page 4-31 .Replace the “Cartridge contact assembly” on page 4-29 . Step Action and questions Yes No 1 Are the vertical streaks visible outside the printed image? Go to step 2 Replace the cartridge. 2Are the vertical streaks in a single color? Go to step 3 Replace the “ITU assembly” on page 4-44 . 3Vertical streaks in a single color, which are visible outside the printed, are most likely caused by a cleaner problem in the print cartridge. Are streaks magenta, cyan, or yellow Replace the cartridge. Replace in order: Black print cartridge “ITU assembly” on page 4-44 . Step Action and questions Yes No 1 Are the horizontal marks or lines in a single color? Replace the cartridge.Go to step 2