Lexmark C750 Service Manual - Page 88

5060-00x Step 5 Action and questions Reinstall the fuser assembly. Watch to see if the lamps turn on and off as the lamps heat up. Do the lamps turn on and off? Yes Go to step 6 No Replace the LVPS assembly. See "Low voltage power supply (LVPS) removal" on page 4-38. Replace the engine board assembly. See "Engine board removal" on page 4-29. 6 Turn the printer on and allow it to reach Ready. Note: The printer may not complete POR and continues to display a 133 error. Remove the fuser assembly from the printer and measure the voltage on connector J10-7 on the engine board. The voltage should measure approximately +3.3 V dc. Is the voltage correct? Go to step 7 7 Measure the voltage on pin 7 of the fuser DC control connector. The voltage should measure approximately +3.3 V dc. Is the voltage correct? Replace the fuser assembly. See "Fuser assembly removal" on page 4-31. Replace the LVPS assembly. See "Low voltage power supply (LVPS) removal" on page 4-38. 134 Error code Hot fuser 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 fuser bearings, hot roll thermistor, LVPS, or engine board. Step 1 Action and questions Turn the printer on, open the right side fuser access door and 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 if it turns on and off. Does the lamp turn on and off? 2 Turn the printer on. Measure the voltage on engine board connector J10-11. The voltage should measure approximately +0.13 V dc to +0.64 V dc as the hot roll lamp turns on and off. Does the voltage change? Replace the fuser assembly. See "Fuser assembly removal" on page 4-31. Yes Go to step 2 No Replace the LVPS assembly. See "Low voltage power supply (LVPS) removal" on page 4-38. Replace the engine board assembly. See "Engine board removal" on page 4-29. 2-54 Service Manual