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Lexmark C760 Service Manual

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    Diagnostic information2-115
      5060-4xx
    Envelopes do not feed from the tray or do not feed correctly
    Step Action and questions Yes No
    1 Check the envelope feeder tray to make sure it is 
    installed correctly.
    Is the tray installed correctly? Go to step 2 Install the tray 
    correctly
    2Check the tray to make sure it has been setup correctly 
    for the size of envelopes being used.
    Has the tray been setup correctly? Go to step 3 Set the tray up 
    correctly
    3Check the tray for any signs of broken or damaged 
    parts.
    Are there any signs of damage to the tray or parts in 
    the tray? Replace the 
    envelope feeder 
    tray
    Replace the 
    envelope feeder 
    option 
    						
    							
    2-116Service Manual
    5060-4
    xx   
    Finisher service check
    If a failure is detected by the system board, an error may be displayed. The LEDs on the HCOF system board 
    can help in diagnosing the errors.
    HCOF error code table
    LEDs lit by number
    Description
    33 34 35 36 37 38 39 42
    x Error detected by Punch Timing Sensor
    x Error detected by Inverter Jam Sensor
    x x Error detected by Drop Timing Sensor
    x Error detected by Exit Timing Sensor
    x x Error detected for the Jogger Motor
    x x Error detected for the Punch Motor
    x x x Error detected for the Stapler Motor
    x Error detected for the Belt Motor
    x x Error detected for the Tray Motor
    x x HCOF detects the front door is open
    x x x Error detected with the communications to the printer
    x x Error detected for the Offset Motor
    x x x Tray Near Full is detected
    x x x x Tray Full is detected
    x Error detected with Stapler - Stapler not mounted correctly
    x x Error detected with Stapler - Stapler Cartridge not installed  correctly
    x x Error detected with Stapler - runs short
    x x x Error detected with Punch Timing Sensor - media not reaching  sensor
    x x Error detected with Inverter Jam Sensor - media not reaching  sensor
    x x x Error detected with Drop Timing Sensor - media not reaching  sensor
    x x x Error detected with Exit Timing Sensor - media not reaching  sensor
    x x x x Error detected with Chad Box - box full 
    						
    							
    Diagnostic information2-117
      5060-4xx
    Check Finisher displayed, unable to clear message
    Step Action and questions Yes No
    1 Check for correct printer and finisher installation. Make 
    sure the magnetic bracket is mounted on the printer.
    Is the magnetic bracket mounted? Go to step 2 If not installed, 
    install the bracket
    2Is the pin on the magnetic bracket actuating the joint 
    switch in the finisher? Go to step 3 Find out why the 
    pin is not 
    actuating the 
    switch and repair 
    as necessary
    3Check the joint switch cable connection to CN19 on the 
    finisher system board.
    Is the cable installed correctly? Go to step 4 Install the cable 
    correctly
    4Check the joint switch activating spring for any signs of 
    damage.
    Is the switch activating spring broken? Replace the joint 
    switch assembly
    Go to step 5
    5Check the joint switch for correct operation. The switch 
    can be checked by measuring continuity while 
    actuating the switch.
    Is the switch operating correctly? Go to step 6 Replace the joint 
    switch assembly
    6Check continuity of the joint switch cable.
    Is there continuity? Replace the 
    finisher system 
    boardReplace the 
    cable 
    						
    							
    2-118Service Manual
    5060-4
    xx   
    Finisher is inoperative, or not recognized
    This problem can be caused by a problem with the autoconnect system between the finisher and the printer. It 
    also can be caused by a problem with the power system in the finisher.
    Step Action and questions Yes No 1 Check the AC line cord to the finisher to make sure the 
    options and printer are connected properly.
    Are the printer and options AC line cords connected 
    properly? Go to step 2 Connect the 
    printer and 
    options correctly
    2Make sure the communications cable from the finisher 
    to the printer is installed correctly at the output options 
    autoconnect on the printer.
    Is the cable installed correctly? Go to step 3 Install the cable 
    correctly
    3Disconnect the autoconnect cable from J2 on the 
    system board. Check the resistance between J2-6 and 
    J2-7 on the cable connector. The resistance measures 
    between 45 ohms and 50 ohms.
    Is the resistance correct? Go to step 6 Go to step 4
    4Make sure the communications cable is connected 
    properly to CN3 on the LVPS relay board.
    Is the cable installed correctly?
    Note
    : The relay on the relay board is connected to 
    +5 V dc from the printer through the communications 
    cable. When the printer is powered on, +5 V dc is sent 
    to the finisher relay board relay coil which energizes 
    the relay and connects primary AC line voltage to the 
    LVPS. Go to step 5 Install the cable 
    correctly
    5Check the resistance of the relay coil by measuring 
    between CN3-1 and CN3-2 on the relay board. The 
    resistance measures between 45 ohms and 50 ohms.
    Is the resistance correct? Replace the 
    communication 
    cable
    Replace the relay 
    board/LVPS 
    assembly
    6Check the voltage on the output options autoconnect 
    connector Pin 2 located on the top right rear of the 
    printer. The voltage measures approximately +5 V dc.
    Is the voltage correct? Go to step 7 Go to step 10
    7Check the AC line voltage between CN2-1 and CN2-3 
    on the relay board. The line voltage should be within 
    specifications for the AC power source the printer is 
    connected to.
    Is there line voltage at CN2?Replace the 
    LVPS assembly
    Go to step 8
    8Check the AC line voltage between CN1-1 and CN1-5 
    on the relay board. The line voltage should be within 
    specifications for the AC power source the printer is 
    connected to.
    Is there line voltage at CN1? Replace the relay 
    board assembly
    Go to step 9
    9Check continuity of the AC line cord.
    Is there continuity? Go to step 10 Replace the line 
    cord 
    						
    							
    Diagnostic information2-119
      5060-4xx
    Front door is open, no indication on display
    Fan in finisher inoperative
    10Check the voltage at J2-5 on the system board. The 
    voltage measures approximately +5 V dc.
    Is the voltage correct? Replace the top 
    options cable
    Replace the 
    system board
    Step Action and questions Yes No 1 Make sure the front door is activating the cover switch.
    Is the door activating the cover switch? Go to step 2 Repair or replace 
    the door 
    assembly
    2Check door - door switch activating tab (broken or 
    missing).
    Is the front door and door activating tab damaged, 
    broken or missing? Replace the front 
    door assembly
    Go to step 3
    3Check the front door magnetic latches to make sure 
    the front door closes correctly.
    Are the magnetic latches functioning properly? Go to step 4 Replace the 
    magnetic latches
    4Check the front door switch cable connection to CN11 
    on the finisher system board.
    Is the cable connected correctly? Go to step 5 Install the cable 
    correctly
    5Check the continuity of the front switch as the switch is 
    activated.
    Do you measure continuity? Go to step 6 Replace the front 
    door switch
    6Check continuity of the front door switch cable.
    Do you measure continuity? Replace the 
    finisher system 
    boardReplace the front 
    door switch cable 
    D1
    Step Action and questions Yes No 1 Make sure the fan cable, H6, is correctly connected to 
    CN21 on the finisher system board.
    Is the cable connected correctly? Go to step 2 Install the cable 
    correctly
    2Check the cable H6 connection to the fan assembly.
    Is the cable connected correctly? Go to step 3 Install the cable 
    correctly
    3Check the voltage between CN21-1 and CN21-2. The 
    voltage measures approximately +24 V dc.
    Is the voltage correct? Go to step 4 Replace the 
    finisher system 
    board
    4Check continuity of the fan cable H6.
    Do you measure continuity? Replace the fan 
    assembly
    Replace cable H6
    Step Action and questions Yes No 
    						
    							
    2-120Service Manual
    5060-4
    xx   
    No indication that the chad box is full, no message
    Chad Box Full message when chad box is not full
    Step Action and questions Yes No
    1 Make sure the chad box is correctly installed in the 
    finisher.
    Is the chad box correctly installed? Go to step 2 Install the chad 
    box correctly
    2Make sure the chad box cable S5 is properly 
    connected to CN5 on the finisher system board.
    Is the cable properly connected? Go to step 3 Install the cable 
    correctly
    3Make sure the chad box cable is properly connected to 
    the chad box sensor located above the box.
    Is the cable properly connected to the sensor? Go to step 4 Install the cable 
    correctly
    4Check the chad box sensor with a voltmeter. Empty the 
    chad box. Check the voltages on CN5. The voltages 
    read the following approximate values with the chad 
    box empty:
    Are the voltages correct? Go to step 5 Replace the 
    finisher system 
    board
    5Check the sensor by placing the chad box or a piece of 
    paper in front of the sensor. As the chad box or piece of 
    paper is moved away from the front of the sensor the 
    voltage on CN5-2 should change from +5 V dc to 0 V 
    dc.
    Does the voltage change? Problem solved Replace the chad 
    box sensor.
    Step Action and questions Yes No 1 Make sure the chad box is correctly installed in the 
    finisher.
    Is the chad box correctly installed? Go to step 2 Install the chad 
    box correctly
    2Check the chad box sensor with a voltmeter. Empty 
    any material that is in the Chad Box. Measure the 
    voltage on CN5-2. The voltage changes from 
    approximately +5 V dc to 0 V dc as the sensor is 
    activated.
    Does the voltage change? The sensor is 
    working correctly
    Replace the 
    finisher system 
    board
    Connector pin Voltage
    CN5-1 +5 V dc  +5 V dc supply
    CN5-2 +5 V dc sensor signal
    CN5-3 0 V dc Ground 
    						
    							
    Diagnostic information2-121
      5060-4xx
    HCIT 2000-sheet option service check
    HCIT system board LED error code table
    If a failure is detected by the system board, an error code may be displayed. If the system board LED is on solid, 
    the HCIT detects that the tray or side door is not closed.
    The LED on the system board may blink. Count the number of times the LED blinks and use the following table 
    to determine the problem.
    LED blinks Problem
    1 Jam at registration sensor S2
    2 Jam before the leading edge of the paper reaches the registration sensor S2
    3 Paper jam is still detected in the HCIT after removing the jam
    4 Paper jam is still detected even with front of jam door closed
    5 Paper jam detected at pick sensor
    6 Error detected with the tray
    7 Error detected at the registration roller home position
    8 Error detected at the pick roller home position sensor (S1)
    9 Error detected with the lift motor - no motor lock or loss of lock
    10 Not used
    11 Communication error
    12 Other error - Failure of the adjustment of the mirror reflection sensors or EEPROM  initialization 
    						
    							
    2-122Service Manual
    5060-4
    xx   
    Printer does not recognize that the HCIT 2000-sheet option is installed.
    Step Action and questions Yes No
    1 Is the HCIT 2000-sheet option the only paper input 
    option that is not recognized? Go to step 5 Go to step 2
    2Make sure that the printer and any option above the 
    HCIT 2000-sheet option are installed correctly.
    Are the printer and any options installed correctly?Go to step 3 Install the options 
    correctly and 
    recheck 
    performance
    3Check for correct installation of the lower options 
    autoconnect cable to system board connector J37.
    Is the cable to J37 installed correctly? Go to step 4 Install the cable 
    correctly and 
    recheck 
    performance
    4Disconnect J37 from the system board and check the 
    voltages on connector J37 on the system board.
    Note: All voltages are approximate values:
    Are the voltages correct? Go to step 5 Replace the 
    system board
    5Autoconnect cables - Check the autoconnect from the 
    printer or option above the HCIT 2000-sheet option. 
    Check for any signs of cuts, pinched wiring, or damage 
    to the contacts in the connector.
    Are there any problems with the autoconnect cables? Repair or replace 
    as necessary
    Go to step 6
    6HCIT autoconnect cable - Check the HCIT autoconnect 
    cable for correct installation at the HCIT system board.
    Is the cable installed correctly? Go to step 7 Install the cable 
    correctly
    7HCIT autoconnect cable continuity - Check the 
    continuity of the HCIT autoconnect cable(s).
    Is there continuity? Replace HCIT 
    system board
    Replace the 
    HCIT 
    autoconnect 
    cable
    Connector pin Voltage
    J37-1 +5 V dc
    J37-2 Ground
    J37-4 +5 V dc
    J37-5 +24 V dc
    J37-7 +5 V dc
    J37-8 +5 V dc 
    						
    							
    Diagnostic information2-123
      5060-4xx
    HCIT inoperative
    Before proceeding with this service check make sure the 2000-sheet tray option is properly connected to AC 
    power.
    If a finisher is installed:
    The AC jumper should go from the HCIT to the finisher. The finisher AC power cord should attach to the AC 
    voltage source. The base printer power cord should plug into the AC output connector on the HCIT.
    If a finisher is not installed:
    The printer power cord plugs into the HCIT AC outlet and the power cord from the HCIT plugs into the AC 
    voltage source.
    Note:   Make sure the electrical outlet is working properly and all power cords are plugged in correctly. Make sure 
    the slide switch on the LVPS is toward the right.
    The system board status LED can be observed by removing the rear cover. The LED is mounted on the HCIT 
    system board.
    Step Action and questions Yes No 1 Does the printer power up and work normally when 
    plugged into the AC outlet on the HCIT? Go to step 2 Go to step 5
    2Check the system board LED. Is it is on solid or 
    blinking?
     On solid means that the HCIT has detected the  front door or side door open.
     Blinking means that the system is operating.
    Is the LED on solid or blinking? If the LED is on 
    solid, check the 
    front and side 
    doors. If the LED 
    is blinking, 
    replace the HCIT 
    system boardGo to step 3
    3Measure the voltage at TP3 (+5 V dc test point) on the 
    HCIT system board. The voltage should measure 
    approximately +5 V dc.
    Is the voltage correct?
    Replace the 
    HCIT system 
    board
    Go to step 4
    4Measure the voltage at CN2 pin 2 on the HCIT system 
    board. The voltage should measure approximately +5 
    V dc.
    Is the voltage correct? Replace the 
    HCIT system 
    board
    Go to step 5
    5Check the AC line voltage at the input to the LVPS.
    Is the voltage correct?
    Replace the 
    HCIT LVPS
    Go to step 6
    6Check the AC cable from the HCIT AC inlet to the 
    LVPS.
    Are the cables good? Determine where 
    the AC line 
    voltage is being 
    lost to the HCIT. 
    Repair as 
    necessary.Replace the 
    cables 
    						
    							
    2-124Service Manual
    5060-4
    xx   
    HCIT 2000-sheet option does not recognize the size paper selected.
    Fuser drive assembly noise check
    Excessive fuser drive motor assembly noise 
    Step Action and questions Yes No
    1 Make sure the media loaded in the tray meets 
    specifications.
    Is the media loaded properly and meet specifications? Go to step 2 Load the media 
    properly or inform 
    the customer that 
    the media does 
    not meet 
    specifications
    2Check the paper tray guide for correct installation.
    Is the paper tray guide installed correctly for the 
    selected paper size? Go to step 3 Reinstall the 
    guide if installed 
    incorrectly 
    3Check for correct installation of the paper size sensor 
    cable to the HCIT system board at CN7.
    Is the cable installed correctly? Go to step 4 Install the cable 
    correctly.
    4Check for a broken, loose, or missing paper size 
    sensor flag spring.
    Is a sensor flag spring broken, loose, or missing? Reconnect the 
    spring if it is 
    loose. Replace 
    the spring if 
    broken or 
    missing.Go to step 5
    5Check the paper size sensor flag for sticking or broken 
    parts.
    Is the paper size sensor flag sticking or broken?
    Replace the 
    paper size flag
    Go to step 6
    6Check continuity of the sensor cable.
    Do you measure continuity? Replace the 
    sensor. If this 
    does not fix the 
    problem, replace 
    the HCIT system 
    board.Replace the 
    sensor cable
    Step Action and questions Yes No 1 Excessive noise from the fuser drive motor assembly - 
    Check for correct installation of the fuser drive 
    assembly.
    Is the fuser drive installed correctly? Go to step 2 Correctly install 
    the “Fuser drive 
    assembly” on 
    page 4-37
    2Install a new  “Fuser assembly” on page 4-35 .
    Is there still excessive noise from the fuser drive motor 
    assembly? Replace the 
    “Fuser drive 
    assembly” on 
    page 4-37Problem 
    resolved. 
    						
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