Lexmark C780 Service Manual - Page 99
Go to the Base Sensor Test. See, Cartridge, contact, assembly, removal on, BASE SENSOR
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5061 Step 2 Actions and questions Check the TMC pin (B) in the cyan cartridge contact assembly to make sure it moves freely. B Yes Go to step 3 No Replace the cartridge contact assembly. See "Cartridge contact assembly removal" on page 4-35. Does the pin move freely? 3 Go to the Base Sensor Test. See "BASE SENSOR TEST" on page 3-24, and check the cyan TMC sensor. When you press the TMC pin in the cyan cartridge contact assembly, make sure it actuates the TMC switch on the developer HVPS. When the TMC pin is pressed in, you hear a click when the switch actuates. Check for mechanical interference between the contact block and the developer HVPS. Note: You may need to turn the printer off to hear the click. Does the cyan TMC switch on the developer HVPS board actuate properly when the TMC pin is pressed? 4 Check the developer HVPS board to make sure it is not cracked or broken. Is the developer HVPS cracked or broken? 5 Check the mounting of the developer HVPS. Make sure the screws that mount the power supply are properly tightened down and the board is positioned and mounted correctly. Is the developer HVPS mounted correctly? 6 Make sure the developer HVPS cable is correctly installed on the developer board assembly. Is the cable correctly installed? 7 Make sure the developer HVPS cable is correctly installed at J6 on the system board. Is the cable properly installed? 8 Check the voltage at connector J6-11 on the system board while pressing the cyan TMC pin in the cartridge contact assembly. Does the voltage change when the pin is pressed? Replace the cartridge. Go to step 6 Replace the developer HVPS board. See "Developer HVPS board removal" on page 4-39. Go to step 7 Go to step 8 Replace the system board. See "System board removal" on page 4-89. Go to step 4 Go to step 5 If the board is incorrectly installed, install it correctly. Make sure all the mounting screws are tightened down. Recheck the printer to see if a 940 Error is still displayed. Correctly connect the cable. Correctly connect the cable. Go to step 9 Diagnostic information 2-57