Lexmark C736 Service Manual
Have a look at the manual Lexmark C736 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 5026 Go Back Previous Next 4Place a voltmeter between FUSER1 pin 3 and ground (pin 6). Does the meter read +5 V dc?Go to step 6. Go to step 5. 51. Replace the fuser. 2. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold and . and turn on the printer). 3. Select SENSOR TESTS, and press Select(). 4. Select Dynamic Sensors, and press Select(). 5. Select Bubble, and press Select(). 6. Open the front door. 7. Activate the bubble sensor. Did the bubble sensor change from Open to Closed?Problem resolved. Replace the system board. See “System board removal” on page 4-153. Step Questions / actions Yes No Pin 6 (ground) Pin 3
2-126Service Manual 5026 Go Back Previous Next Dead printer service check A dead printer is a condition where the display is blank, the LED on the operator panel is off, no fans turn, no motors turn, and the fuser lamp does not come on. If a 550-sheet option assembly is installed, remove the option and check the base printer for correct operation. If the base printer operates correctly, replace the 550-sheet option assembly. Warning:Observe all necessary ESD precautions when removing and handling the system board or any installed option cards or assemblies. See “Handling ESD-sensitive parts” on page 4-2. Remove any input and output paper handling options from the printer. Step Questions / actions Yes No 1Check the AC line voltage. Is the line voltage correct?Go to step 2. Inform the customer. 2Is the AC line cord damaged? Replace the line cord. Go to step 3. 3Check the system board for +5 V dc between JLVPS2 pin 1 and ground. Is the voltage correct?Replace the system board. See “System board removal” on page 4-153. Go to step 4. 4Is the JLVPS2 cable correctly installed at JLVPS2 on the system board?Go to step 5. Reseat the JLVPS1 cable. 5Turn the printer off. Disconnect the JLVPS2 cable from the system board. Turn the printer on, and then measure the voltage between the JLVPS2 cable pin 1 and the JLVPS2 pin 14 (black wire). Does this measure approximately +5 V dc?Go to step 6. Replace the LVPS. See “Low-voltage power supply (LVPS) removal” on page 4-112. 61. Turn the printer off. 2. Disconnect the cables in J5, JCARTS1, JCARTS2, JDVR1, JFDPCK1, JFUSER1, JINT1, JOPT1, and JTLBT1. 3. Connect the JLVPS2 cable to the system board. 4. POR the printer. Does the printer still appear dead?Contact your next level of support.Go to step 7. 71. Connect one cable at a time, and POR the printer. 2. Is the printer dead?The part connected to that cable is faulty. Replace the failing part.Connect another cable and continue with this step. CAUTION When you see this symbol, there is a danger from hazardous voltage in the area of the product where you are working. Unplug the product before you begin, or use caution if the product must receive power in order to perform the task. 1JSB1JBIN1 JFAN1JFUSER1 JBOR1JHVPS1 JMIRR1JBLW1 JCVR1 JLVPS2 JCARTP1 JCARTS1 JCARTS2 JCARTP2 JDVR1 JTPS1 JOPT1 JFDS1 JINT1 JFDPCK1JTRAY1JSEC1 JDX1 JT12J5 JDIMM1JOPP1 JT1 JUSB1 JBOOT1 JFMUSB1 J49 JTWF1 JTDBUG1 1111 11 1 11 1 1 1 1 1 1 1 1 1 11 1 1111 JTLBT1 JPH1 F5F6F7 F9 F10F12F13F141 1J1011 A
Diagnostic information2-127 5026 Go Back Previous Next Exit sensor service check Step Questions / actions Yes No 1Verify the paper is loaded properly in the paper tray or manual feed slot. Is the paper properly loaded?Go to step 2. Load paper correctly. 2Turn the printer off, and remove the fuser. See “Fuser removal” on page 4-104. POR the printer. Did the error clear?Problem resolved. Remove the new fuser, and go to step 3. 3Remove the rear frame cover. See “Rear frame cover removal” on page 4-33. Check the fuser DC cable in the connector JFUSER1 for proper connection to the system board, for pinch points, and for any other damage to the cable or the connector. Is the cable damaged?Replace the fuser DC cable. See “Fuser DC cable removal” on page 4-106. Go to step 5. 4Place a voltmeter between the fuser DC autoconnect pin 8 and ground (pin 6). Does the meter rear +5 V dc?Go to step 6. Go to step 5. 5Place a voltmeter between the connector JFUSER1 pin 8 and ground (pin 6) on the system board. Does the meter read +5 V dc?Go to step 6. Replace the fuser DC cable. See “Fuser DC cable removal” on page 4-106. 1JSB1JBIN1 JFAN1JFUSER1 JBOR1JHVPS1 JMIRR1JBLW1 JCVR1 JCVR1 JLVPS2 JCARTP1 JCARTS1 JCARTS2 JCARTP2 JDVR1 JTPS1 JOPT1 JFDS1 JINT1 JFDPCK1JTRAY1JSEC1 JDX1 JT12J5 JDIMM1JOPP1 JT1 JUSB1 JBOOT1 JFMUSB1 J49 JTWF1 JTDBUG1 1111 11 1 11 1 1 1 1 1 1 1 1 1 11 1 1111 JTLBT1 JPH1 F5F6F7 F9 F10F12F13F141 1J1011 A
2-128Service Manual 5026 Go Back Previous Next Input sensor service check 61. Replace the fuser. 2. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold and . and turn on the printer). 3. Select SENSOR TESTS, and press Select(). 4. Select Dynamic Sensors, and press Select(). 5. Select Fuser Exit, and press Select(). 6. Open the front door, and then the top access cover. 7. Activate the fuser exit sensor. Did the fuser exit sensor change from Open to Closed?Problem resolved. Replace the system board. See “System board removal” on page 4-153. Step Questions / actions Yes No 1Is the input sensor flag damaged? Replace the paper pick mechanism. See “Paper pick mechanism assembly removal” on page 4-127. Go to step 2. 21. Turn the printer off. 2. Remove the rear frame cover. See “Rear frame cover removal” on page 4-33. 3. Check the cable in connector JTRAY1 for proper connection to the system board, for pinch points, and any other damage to the cable or connector. Is the cable damaged?Replace the paper pick mechanism. See “Paper pick mechanism assembly removal” on page 4-127.Go to step 3. Step Questions / actions Yes No 1JSB1JBIN1 JFAN1JFUSER1 JBOR1JHVPS1 JMIRR1 JMIRR1JBLW1 JCVR1 JLVPS2 JCARTP1 JCARTS1 JCARTS2 JCARTP2 JDVR1 JTPS1 JOPT1 JFDS1 JINT1 JFDPCK1JTRAY1JSEC1 JDX1 JT12J5 JDIMM1 JDIMM1JOPP1 JT1 JUSB1 JBOOT1 JFMUSB1 J49 J49 JTWF1 JTDBUG1 1111 11 1 11 1 1 1 1 1 1 1 1 1 11 1 1111 JTLBT1 JPH1 F5F6F7 F9 F10F12F13F141 1J1011 A
Diagnostic information2-129 5026 Go Back Previous Next Networking service check Note: Before starting this service check, print out the network setup page. This page is found under Menu— Reports—Network Settings. Consult the network administrator to verify that the physical and wireless network settings displayed on the network settings page for the device are properly configured. If a wireless network is used, verify that the printer is in range of the host computer or wireless access point, and there is no electronic interference. Have the network administrator verify that the device is using the correct SSID, and wireless security protocols. For more network troubleshooting information, consult the Lexmark Network Setup Guide. 31. Disconnect the cable in connector JTRAY1. 2. Connect the cable from the new paper pick assembly in the connector TRAY2. 3. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold and . and turn on the printer). 4. Select SENSOR TESTS, and press Select(). 5. Select Dynamic Sensors, and press Select(). 6. Select Input, and press Select(). 7. Activate the input sensor. pin 2 and ground, and POR the printer. Did the input sensor change from Open to Closed?Replace the paper pick mechanism. See “Paper pick mechanism assembly removal” on page 4-127. Replace the system board. See “System board removal” on page 4-153. Step Questions / actions Yes No 1If the device is physically connected to the network, verify that the ethernet cable is properly connected on both ends. Is the cable properly connected?Go to step 3. If the network is wireless, got to step 3.Go to step 2. 2Connect the ethernet cable. Did this fix the problem?Problem resolved Go to step 3. 3Check the printer’s online status under Printers and Faxes on the host computer. Delete all print jobs in the print queue. Is the printer online and in a Ready state.Go to step 5. Go to step 4. 4Change the printer status to online. Did this fix the issue?Problem resolved. Go to step 5. 5Does the IP address displayed on the network settings page match the IP address in the port of the drivers using the printer?Go to step 10. Go to step 6. 6Does the LAN use DHCP? Note: A printer should use a static IP address on a network.Go to step 7. Go to step 9. 7Are the first two segments if the IP address 169.254?Go to step 8. Go to step 9 8POR the printer. Is the problem resolvedProblem resolved Go to step 10. Step Questions / actions Yes No
2-130Service Manual 5026 Go Back Previous Next 9Reset the address on the printer to match the IP address on the driver. Did this resolve the issue?Problem fixed. Go to step 10. 10Have the network admin verify that the printer and PC’s IP address have identical subnet addresses. Are the subnet addresses the same?Go to step 12. Go to step 11. 11Using the subnet address supplied by the network admin, assign a unique IP address to the printer. Note: The printer IP address should match the IP address on the printer driver. Did this fix the problem?Problem resolved. Go to step 12. 12Is the device physically connected (ethernet cable) to the network?Go to step 13. Go to step15. 13Try using a different ethernet cable. Did this remedy the situation?Problem resolved. Go to step 14. 14Have the network administrator check the network drop for activity. Is the drop functioning properly?Replace the system board. See “System board removal” on page 4-153.Contact the network administrator. 15Is the printer on the same wireless network as the other devices?Go to step 17. Go to step 16. 16Assign the correct wireless network to the printer. Did this fix the problem?Problem resolved. Go to step 17. 17Are the other devices on the wireless network communicating properly?Go to step 18. Contact the network administrator. 18Verify that the ISP wireless card cable is properly seated in their connectors. Is the wireless card seated correctly?Go to step 20. Go to step 19. 19Properly reseat the ISP cables. Did this fix the problem?Problem resolved. Go to step 20. 20Replace the ISP wireless card. See Installing an Internal Solutions Port (ISP). Did this fix the problem?Problem resolved. Replace the system board. See “System board removal” on page 4-153. Step Questions / actions Yes No
Diagnostic information2-131 5026 Go Back Previous Next Operator panel service check One or more operator panel buttons fail Operator panel display blank, five beeps, and LED is off Service tip: The printer has detected a problem with the system board, the operator panel assembly cable (part of the top cover access assembly), or the operator panel assembly if POST does not complete. The printer emits five beeps, and then sticks in a continuous pattern until the printer is turned off. Operator panel display blank, five beeps, LED on Service tip: The printer has detected a problem with the system board, the operator panel assembly cable (part of the top cover access assembly), or the operator panel assembly if POST does not complete. The printer emits five beeps, and then sticks in a continuous pattern until the printer is turned off. Step Questions / actions Yes No 1Run the Button Test. See“Button Test” on page 3-12 in Diagnostics mode. Did any of the buttons fail the test?Replace the operator panel assembly. See “Operator panel assembly removal” on page 4-24. Go to step 2. 2Disconnect the operator panel assembly cable from JOPP1 on the system board, and then measure the voltage on pin 6 and ground. Does the voltage measure approximately +3.3 V dc?Replace the operator panel assembly. See “Operator panel assembly removal” on page 4-24. If this does not fix the problem, replace the top cover access assembly. See “Top access cover assembly removal” on page 4-40. Replace the system board. See “System board removal” on page 4-153. Step Questions / actions Yes No 1Is the operator panel assembly cable properly installed at system board JOPP1 and at the operator panel assembly?Go to step 2. Reinstall the cable. 2Measure the voltage between JOPP1 pin 2 and ground on the system board. Is the voltage approximately +5 V dc?Go to step 3. Replace the system board. See “System board removal” on page 4-153. 3Check continuity of the operator panel assembly cable. Is there continuity?Replace the operator panel assembly. See “Operator panel assembly removal” on page 4-24. Replace the top cover access assembly. See “Top access cover assembly removal” on page 4-40. Step Questions / actions Yes No 1Check for ground between JOPP1 pin 4 and ground. Is the voltage approximately 0 V dc?Replace the operator panel assembly. See “Operator panel assembly removal” on page 4-24. Go to step 2. 2Check the operator panel assembly cable. Is the cable damaged?Replace the top cover access assembly. See “Top access cover assembly removal” on page 4-40. Replace the system board. See “System board removal” on page 4-153.
2-132Service Manual 5026 Go Back Previous Next Operator panel display all diamonds, no beeps Operator panel display all diamonds, five beeps 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 a developer (toner) cartridge or photoconductor unit. Service tip: Before troubleshooting any print quality problems, do the following: 1.Print a menu settings page, and then check the life status of all supplies. Any supplies that are low should be replaced. Note: Be sure and keep the original menu page to restore the customers custom settings if needed. 2.On the menu page, make sure the following is set to the default level: –Color Correction: Set to Auto. –Print Resolution: Set to 1200 dpi (print quality problems should be checked at different resolution settings). –Toner Darkness: Set to 4 (default). –Color Saver: Set to OFF. –RGB Brightness, RGB Contrast, RGB Saturation: Set to 0. –Color Balance: Select Reset Defaults to zero out all colors. –Check the paper type, texture and weight settings against what is loaded in the printer. Once the printer has been restored to its default levels, do the following: 3.Inspect the transfer module for damage. Replace if damaged. 4.Inspect the photoconductor units and toner cartridges for damage. Replace if damaged. 5.If paper other than 20 lb plain letter/A4 paper is being used, load 20 lb plain letter/A4 and print the Print Quality pages to see if the problem remains. Step Questions / actions Yes No 1Check the operator panel assembly cable. Is the cable damaged?Replace the top access cover assembly. See “Top access cover assembly removal” on page 4-40. Go to step 2. 2Measure the voltage between JOPP1 pin 2 and ground on the system board. Is the voltage approximately +5 V dc?Replace the operator panel assembly. See “Operator panel assembly removal” on page 4-24.Replace the system board. See “System board removal” on page 4-153. Step Questions / actions Yes No 1Check the operator panel assembly cable. Is the cable damaged?Replace the top access cover assembly. See “Top access cover assembly removal” on page 4-40. Go to step 2. 2Measure the voltage between JOPP1 pin 2 and ground on the system board. Is the voltage approximately +5 V dc?Replace the operator panel assembly. See “Operator panel assembly removal” on page 4-24.Replace the system board. See “System board removal” on page 4-153.
Diagnostic information2-133 5026 Go Back Previous Next 6.Use Tray 1 to test print quality problems. 7.Print the Print Quality Pages, and then look for variations in the print from what is expected. An incorrect printer driver for the installed software can cause problems. Incorrect characters could print, and the copy may not fit the page correctly. Measure all voltages from the connector to the printer ground. Print quality—background Service tip: Some background problems can be caused by rough papers, non-Lexmark toner cartridges or if the media texture is set to the rough setting. Some slick or coated papers may also cause background problems. Some problems occur with printers that run a large amount of graphics in a humid environment. Step Questions / actions Yes No 1Read the current status of the photoconductor unit from the customer menus. To view the status of the photoconductor units: 1. In Ready mode, press Admin Menu. 2. Select Reports, and press Select(). 3. Select Device Statistics, and press Select(). Ask the customer if the photoconductor unit has been recently replaced. It is possible the photoconductor value was not reset and the photoconductor unit is past end of life. If the PC unit was recently replaced, reset the value. If the PC unit was not replaced, replace the PC unit. Has the photoconductor unit been recently replaced?Reset the value. To reset this value: 1. In Ready mode, press Admin Menu. 2. Select Supplies Menu, and press Select(). 3. Select Replace Supply, and press Select(). 4. Select the PC color unit you want to change 5. Select Yes. If this does not fix the problem, go to step 2.Go to step 2. 2Replace the PC unit. See “Photoconductor unit removal” on page 4-132. Does this fix the problem?Problem solved. Go to step 3. 3Check the high voltage contact from the HVPS to the transfer module. Is a problem found?Replace the spring or the transfer contact assembly. Go to step 4. Transfer belt high voltage path (typical 4X)
2-134Service Manual 5026 Go Back Previous Next Print quality—blank page 4Reseat the JHVPS connector. Does this fix the problem?Problem solved. Go to step 5. 5Replace the HVPS. See “High-voltage power supply (HVPS) removal” on page 4-108. Does this fix the problem?Problem solved. Go to step 6. 6Clean the printhead. Does this fix the problem?Problem solved. Replace the printhead. See “Printhead removal, installation, and adjustment” on page 4-135. Step Questions / actions Yes No 1Is all the packing material for the photoconductor unit in question removed?Go to step 2. Remove the packing material. 2Replace the photoconductor unit for the color in question. Does this fix the problem?Problem solved. Go to step 3. 3 4 Enter the Diagnostics mode (turn off the printer, press and hold and . and turn on the printer). Perform the appropriate cartridge drive motor test for the missing color. See “General motor tests procedures” on page 3-9. Did the motor run?Go to step 5. Replace the EP drive assembly. See “Electrophotographic (EP) drive assembly removal” on page 4-82. Step Questions / actions Yes No