Lexmark C750 Service Manual - Page 153

5060-00x POR complete, printer feeds blank page This symptom is usually associated with the Upper switch mounted on the Front Access Door Support and with the right switch mounted in the ITU Light Shield. Step 1 Action and questions Make sure that the ITU light shield is not broken. Is the ITU light shield broken? 2 Make sure that the ITU light shield is not out of position. Is the ITU light shield out of position? 3 Make sure the ITU assembly interlock switch actuator is not damaged or broken and actuates the switches correctly. Is the actuator damaged or broken? 4 Front cover assembly Does the front cover close correctly? Yes Replace the ITU light shield Properly align ITU light shield Replace the ITU assembly. See "ITU assembly removal" on page 4-37 Go to step 5 No Go to step 2 Go to step 3 Go to step 4 Install the front cover correctly or repair as necessary Go to step 6 5 Front cover assembly Make sure the front cover flag is not broken or damaged and actuates the switches correctly. Is the flag broken or damaged? Replace the front cover. See "Front cover assembly removal" on page 4-10 Go to step 7 6 HVPS/cover open interlock cable assembly to engine board-make sure that the cable is correctly connected to J86 on the engine board. Is the cable connected correctly? Install the cable correctly 7 HVPS/cover open interlock cable assembly-make sure the front cover is closed and the ITU is correctly installed. Disconnect the switch cable from J86 on the engine board. Check for continuity between J86-1 and J86-2 on the cable connector. Is there continuity? Replace the engine board. See "Engine board removal" on page 4-29 Replace the HVPS/ cover open interlock switch/ cable assembly Diagnostic information 2-119