Lexmark C760 Service Manual
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Diagnostic information2-45 5060-4xx 120 error code This error code displays whenever an incorrect hot roll fuser lamp is installed. 4Check the printer is setting on a solid, flat surface. Is the printer setting on a solid flat surface? Go to step 5 Inform the customer that the printer must be setting on a solid flat surface. 5The front contamination shield is attached to the front plate of the ITU frame and lies on the top of the ITU belt. Is the front contamination shield lying on the ITU belt. Go to step 6 Position the shield on top of the belt. 6Remove the ITU and check the ITU belt position. If the belt has shifted to the front or to the rear it should be replaced. The belt must not shift more than 4 mm in either direction. Check by making the measurements as shown. The lower limit is 3.1 mm, the high limit is 8.1 mm, and the optimum position is 5.6 mm. Has the ITU Belt shifted to the front or to the rear? Replace the “ITU assembly” on page 4-44 and run the “Belt Tracking (ITU 4th point adjustment)” on page 3-18 . Treat as a belt stall or signal communications problem. See “100 ITU Error” on page 2-41 . Step Action and questions Yes No 1 Check to make sure that the line voltage to the printer matches the line voltage selection switch on the LVPS. Does the line voltage match the LVPS line voltage selection? Go to step 2 Set the line voltage selection switch to match the line voltage to the printer. 2Is the correct fuser assembly installed in the printer? Go to step 3 Replace the “Fuser assembly” on page 4-35 with the correct fuser assembly. 3Check for continuity between pins 1 and 2 on the AC fuser connector on the fuser assembly Do you measure continuity? Replace the “LVPS assembly” on page 4-46 . Replace the “Fuser assembly” on page 4-35 . Step Action and questions Yes No
2-46Service Manual 5060-4 xx 121 error code This error code displays whenever an incorrect fuser backup roll lamp is installed. 122 error code Cold fuser If error code 122 displays, the printer has detected a problem in the fuser hot roll lamp circuity, back up roll fuser lamp circuits, fuser hot roll thermistor, back up roll thermistor, system board, or LVPS fuser control circuits. Replace the following FRUs in the order shown: 1.“Fuser assembly” on page 4-35. 2.“LVPS assembly” on page 4-46. 3.“System board” on page 4-72. 123 error code Cold fuser If error code 123 is displays, the printer detects a problem in the fuser hot roll lamp circuits, back up roll fuser lamp circuits, fuser hot roll thermistor, back up roll thermistor, system board, or LVPS fuser control circuits. Replace the FRUs in the following order. 1.“Fuser assembly” on page 4-35 . 2.“LVPS assembly” on page 4-46. 3.“System board” on page 4-72. Step Action and questions Yes No 1 Check to make sure that the line voltage to the printer matches the setting of the line voltage selection switch on the LVPS. Does the line voltage match the line voltage selection? Go to step 2 Set the line voltage selection switch to match the line voltage to the printer. 2Is the correct fuser assembly installed in the printer? Go to step 3 Replace the “Fuser assembly” on page 4-35 with the correct fuser assembly. 3Check for continuity between pins 2 and 5 on the AC fuser connector on the fuser assembly. Replace the “LVPS assembly” on page 4-46 . Replace the “Fuser assembly” on page 4-35 .
Diagnostic information2-47 5060-4xx 124 error code Hot fuser Error code 124 displays whenever the printer detects a problem with the fuser running over temperature or the fuser lamps have been on too long. A problem could exist in the fuser assembly with the hot roll bearings, hot roll thermistor, or other hot roll parts. The LVPS or system board assembly can also be failing. 125 error code Hot fuser Error code 125 displays whenever the printer detects a problem with the fuser running over temperature or the fuser lamps have been on too long. A problem exists in the fuser assembly with the back up roll bearings, back up roll thermistor, LVPS, or system board.Step Action and questions Yes No 1 Open the right fuser access door. Observe the fuser and see if the hot roll fuser lamp turns on and off. You may have to observe for a few minutes. Do the lamps turn off and on? Go to step 2 Replace the “LVPS assembly” on page 4-46. 2Turn the printer on and measure the voltage on connector J33-11 on the system board. The voltage should measure approximately +0.13 V dc to +0.64 V dc as the hot roll lamp turns on and off. Is the voltage correct? Replace the “Fuser assembly” on page 4-35 . Replace the “System board” on page 4-72 . Step Action and questions Yes No 1 Open the right fuser access door. Observe the fusser and see if the backup roll fuser lamp turns on and off. You may have to observe for a few minutes. Does the lamp turn off and on? Go to step 2 Replace the “LVPS assembly” on page 4-46. 2Turn the printer on and measure the voltage on connector J33-12 on the system board. The voltage should measure approximately +0.13 V ac to +0.64 V ac as the backup roll lamp turns on and off. Is the voltage correct? Replace the “Fuser assembly” on page 4-35 . Replace the “System board” on page 4-72 .
2-48Service Manual 5060-4 xx 126 error code Hot roll thermistor or thermistor circuits are open If error code 126 displays, the printer detects a problem in the fuser hot roll, back up roll lamp circuits, fuser hot roll thermistor, back up roll thermistor, system board, or LVPS fuser control circuits. 127 error code Backup roll thermistor or thermistor circuits are open If error code 127 displays the printer detects a problem in the fuser hot roll or back up roll fuser lamp circuits, fuser hot roll thermistor, back up roll thermistor, system board, or LVPS fuser control circuits.Step Action and questions Yes No 1 Turn the printer on and allow it to reach the Ready prompt. Note: The printer may not complete POR and post a 126 Error message. Measure the voltage on connector J33-6 on the system board. The voltage should measure approximately +3.3 V dc. Is the voltage correct? Go to step 2 Replace the “System board” on page 4-72. 2Measure the voltage on the fuser DC control connector on the LVPS. Measure the voltage on pin 6 of the connector. Does the voltage measure approximately +3.3 V dc? Replace the “Fuser assembly” on page 4-35 . Replace the “LVPS assembly” on page 4-46 Step Action and questions Yes No 1 Turn the printer on and allow it to reach the Ready prompt. Note: The printer may not complete POR and post a 127 Error message. Measure the voltage on connector J33-7 on the system board. The voltage should measure approximately +3.3 V dc. Is the voltage correct? Go to step 2 Replace the “System board” on page 4-72. 2Measure the voltage on the fuser DC control connector on the LVPS. Measure the voltage on pin 7 of the connector. Is the voltage measure approximately +3.3 V dc. Replace the “Fuser assembly” on page 4-35 . Replace the “LVPS assembly” on page 4-46
Diagnostic information2-49 5060-4xx 128 error code Fuser hot roll is under temperature during standby 129 error code Fuser backup roll is under temperature during standby.Step Action and questions Yes No 1 Turn the printer on and allow it to reach a Ready prompt. Note: The printer may not complete POR and continue to display the 128 Error message. Remove the fuser assembly from the printer. Measure the voltage on connector J33-6 on the system board. The voltage should measure approximately 3.3 V dc. Is the voltage correct? Go to step 2 Replace the “System board” on page 4-72. 2Measure the voltage on the fuser DC control connector on the LVPS. Measure the voltage on pin 6 of the connector. Does the voltage measure approximately +3.3 V dc. Replace the “Fuser assembly” on page 4-35 . Replace the “LVPS assembly” on page 4-46 . Step Action and questions Yes No 1 Turn the printer on and allow it to reach a Ready prompt. Note: The printer may not complete POR and continues to display the 129 Error message. Remove the fuser assembly from the printer. Measure the voltage on connector J33-7 on the system board. The voltage should measure approximately +3.3 V dc. Is the voltage correct? Go to step 2 Replace the “System board” on page 4-72. 2Measure the voltage on the fuser DC control connector on the LVPS. Measure the voltage on pin 7 of the connector. Does the voltage measure approximately +3.3 V dc. Replace the “Fuser assembly” on page 4-35 . Replace the “LVPS assembly” on page 4-46 .
2-50Service Manual 5060-4 xx 130 error code Hot roll did not reach the correct standby temperature This error displays when the fuser hot roll does not reach the correct standby temperature. Step Action and questions Yes No 1 Measure the voltage on connector J33-11 on the system board. The voltage measures approximately 0.13 V dc to 0.64 V dc as the hot roll lamp turns off and on. Is the voltage correct? Replace the “Fuser assembly” on page 4-35 . Go to step 2 2Remove the fuser from the printer. Check continuity of the hot roll lamp by measuring between pins 1 and 2 on the AC fuser connector on the fuser assembly. Is there continuity? Go to step 4 Go to step 3 3Check to make sure that the hot roll lamp is installed correctly. Is the hot roll lamp installed correctly? Go to step 4 Install the lamp correctly. If this does not fix the problem, replace the “Fuser assembly” on page 4-35 . 4Reinstall the fuser assembly. Watch to see if the lamps turn on and off as the lamp heat up. Do the lamps turn on? Go to step 5 Replace the “LVPS assembly” on page 4-46. 5Turn the printer on and allow it to reach a Ready prompt. Note: The printer may not complete POR and continues to display the error code. Remove the fuser assembly from the printer. Measure the voltage on connector J33-6 on the system board. The voltage should measure approximately +3.3 V dc. Is the voltage correct? Go to step 6 Replace the “System board” on page 4-72. 6Measure the voltage on the fuser DC control connector on the LVPS. Measure the voltage on pin 6 of the connector. Does the voltage measure approximately +3.3 V dc? Replace the “Fuser assembly” on page 4-35 . Replace the “LVPS assembly” on page 4-46 .
Diagnostic information2-51 5060-4xx 131 error code Backup roll did not reach the correct standby temperature Step Action and questions Yes No 1 Measure the voltage on connector J33-12 on the system board. The voltage measures approximately 0.14 V dc to 0.64 V dc as the back up roll lamp turns off and on. Is the voltage correct? Go to step 2 Replace the “Fuser assembly” on page 4-35 2Remove the fuser from the printer. Check continuity of the backup roll lamp by measuring between pins 5 and 2 on the AC fuser connector on the fuser assembly. Is there continuity? Go to step 4 Go to step 3 3Check to make sure that the backup roll lamp is installed correctly. Is the hot roll lamp installed correctly? Go to step 4 Install the lamp correctly. If this does not fix the problem, replace the “Fuser assembly” on page 4-35 . 4Reinstall the fuser assembly. Watch to see if the lamps turn on and off as the lamp heat up. Do the lamps turn on? Go to step 5 Replace the “LVPS assembly” on page 4-46. 5Turn the printer on and allow it to reach a Ready prompt. Note: The printer may not complete POR and continues to display the error code. Remove the fuser assembly from the printer. Measure the voltage on connector J33-7 on the system board. The voltage should measure approximately +3.3 V dc. Is the voltage correct? Go to step 6 Replace the “System board” on page 4-72. 6Measure the voltage on the fuser DC control connector on the LVPS. Measure the voltage on pin 7 of the connector. Does the voltage measure approximately +3.3 V dc? Replace the “Fuser assembly” on page 4-35 . Replace the “LVPS assembly” on page 4-46 .
2-52Service Manual 5060-4 xx 132 error code Cold hot roll Step Action and questions Yes No 1 Measure the voltage on connector J33-11 on the system board. The voltage should measure approximately +0.13 V dc to +0.64 V dc as the hot roll lamp turns off and on. Is the voltage correct? Go to step 2 Replace the “System board” on page 4-72 2Remove the fuser from the printer. Check continuity of the hot roll lamp by measuring between pins 1 and 2 on the AC fuser connector on the fuser assembly. Is there continuity? Go to step 4 Go to step 3 3Check to make sure the hot roll lamp is installed correctly. Is the hot roll lamp installed correctly? Go to step 4 Install the lamp correctly. If this does not fix the problem, replace the “Fuser assembly” on page 4-35 . 4Reinstall the fuser assembly. Watch to see if the lamps turn on and off as the lamp heats up. Do the lamps turn on? Go to step 5 Replace the “Fuser assembly” on page 4-35 5Turn the printer on and allow it to reach a Ready prompt. Note: The printer may not complete POR and may continue to display the error code. Remove the fuser from the printer. Measure the voltage on connector J33-6 on the system board. The voltage should measure approximately 3.3 V dc. Is the voltage correct? Go to step 6 Replace the “System board” on page 4-72. 6Measure the voltage on the fuser DC control connector on the LVPS. Measure the voltage on pin 6 of the connect. Does the voltage measure approximately +3.3 V dc? Replace the “Fuser assembly” on page 4-35 . Replace the “LVPS assembly” on page 4-46 .
Diagnostic information2-53 5060-4xx 133 error code Cold backup roll Step Action and questions Yes No 1 Measure the voltage on connector J33-12 on the system board. The voltage should measure approximately +0.13 V dc to +0.64 V dc as the backup roll lamp tur ns off and on. Is the voltage correct? Go to step 2 Replace the “System board” on page 4-72. 2Remove the fuser from the printer Check continuity of the backup roll by measuring between pins 1 and 5 on the AC fuser connector on the fuser assembly. Is there continuity? Go to step 4 Go to step 3 3Check to make sure that the backup roll lamp is installed correctly. Is the backup roll lamp installed correctly? Go to step 4 Install the lamp correctly. If this does not fix the problem, replace the “Fuser assembly” on page 4-35 . 4Reinstall the fuser assembly. Watch to see if the lamps turn on and off as the lamp heats up. Do the lamps turn on? Go to step 5 Replace the “LVPS assembly” on page 4-46. 5Turn the printer on and allow it to reach a Ready prompt. Note: The printer may not complete POR and continues to display the error code. Remove the fuser assembly from the printer. Measure the voltage on connector J33-7 on the system board. The voltage should measure approximately +3.3 V dc. Is the voltage correct? Go to step 6 Replace the “System board” on page 4-72. 6Measure the voltage on the fuser DC control connector on the LVPS. Measure the voltage on pin 7 of the connector. Does the voltage measure approximately +3.3 V dc. Replace the “Fuser assembly” on page 4-35 . Replace the “LVPS assembly” on page 4-46 .
2-54Service Manual 5060-4 xx 134 error code Hot fuser Error code 134 indicates that the fuser is running over temperature or the hot roll fuser lamp has been on too long. Error code 134 may also indicate a problem in the fuser assembly with the hot roll bearings, hot roll thermistor, LVPS, or the system board. 135 error code Error code 135 indicates that a problem exists in the fuser assembly with the backup roll bearings, backup roll thermistor, LVPS, or system board. 136 error code Fuser assembly cam position is not found.Step Action and questions Yes No 1 Turn the printer on. Open the right side fuser access door. Observe the hot roll lamp to see if it turns on and off. You may have to obser ve the lamp for a few minutes to see if it turns on and off. Does the lamp turn on and off? Go to step 2 Replace the “LVPS assembly” on page 4-46. 2Turn the printer on and measure the voltage on connector J33-11 on the system board. The voltage should measure approximately +0.13 V dc and +0.64 V dc as the hot roll lamp turns on and off. Is the voltage correct? Replace the “Fuser assembly” on page 4-35 . Replace the “System board” on page 4-72 . Step Action and questions Yes No 1 Power on the printer. Open the right side of the fuser access door. Observe the hot roll lamp to see if it turns on and off. You may have to observe the lamp for a few minutes to see it turn on and off. Does the lamp turn on and off? Go to step 2 Replace the “LVPS assembly” on page 4-46. 2Turn the printer on and measure the voltage on connector J33-12 on the system board. The voltage should measure approximately +0.13 V dc to +0.64 V dc as the hot roll lamp turns on and off. Is the voltage correct? Replace the “Fuser assembly” on page 4-35 . Replace the “System board” on page 4-72 . Step Action and questions Yes No 1 Observe the fuser drive assembly gears rotate during POR. Do the gears rotate? Go to step 2 Go to step 5