Lexmark C750 Service Manual - Page 83
Lexmark C750 Manual
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5060-00x 129 Error code The fuser backup roll is under temperature during standby. Replace the fuser top duct. See "Fuser top duct removal" on page 4-34. Step 1 Action and questions Turn the printer on and allow it to reach Ready. Note: The printer may not complete POR and continue to display the 129 error message. 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? 2 Measure the voltage on pin 7 of the DC control connector on the LVPS. 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. Yes Go to step 2 No Replace the engine board assembly. See "Engine board removal" on page 4-29. Diagnostic information 2-49