Lexmark C750 Service Manual - Page 90

5060-00x 136 Error code Fuser assembly cam position is not found Step 1 Action and questions Observe the fuser drive assembly gears rotate during POR. Do the gears rotate? 2 Do the gears stop and the fuser drive assembly gears make a loud buzzing sound? Replace the fuser assembly. See "Fuser assembly removal" on page 4-31 Go to step 4 Go to step 3 Yes Go to step 2 No Go to step 6 3 Check for correct installation of the fuser control cable to J10 on the engine board. Is the cable installed correctly? Install the cable correctly. 4 Enter the diagnostic mode. Measure the voltage on the engine board connector J10-2. The voltage should measure approximately +5 V dc. Is the voltage correct? Go to step 5 Replace the engine board assembly. See "Engine board removal" on page 4-29. Replace the LVPS assembly. See "Low voltage power supply (LVPS) removal" on page 4-38. Install the cable correctly. 5 Remove the fuser from the printer. Measure the voltage at the DC fuser control connector, pins 2 and 9. The voltage should measure approximately +5 V dc. Is the voltage correct? Replace the fuser assembly. See "Fuser assembly removal" on page 4-31. Go to step 7 6 Check for correct installation of the fuser drive motor cable to connector J8 on the engine board. Is the cable installed correctly? 7 Remove the fuser fan to gain access to the fuser drive motor cable. Check the cable for correct installation to J1 on the fuser drive motor assembly. Is the cable installed correctly? Go to step 8 Install the cable correctly. 8 Enter CE Diagnostic mode and measure the following voltages on connector J8. Voltages are approximate. Pin J8-8 J8-4 Voltage +24 V dc +5 V dc Replace the fuser drive assembly. See "Fuser drive assembly removal" on page 4-33. Replace the engine board assembly. See "Engine board removal" on page 4-29. Are the voltages correct? 2-56 Service Manual