Lexmark C782 Service Manual - Page 121

5061 Close door/HVPS/printhead interlock switch service check Note: There are two separate cables that contain microswitches and a cable. These cable/switches provide separate interlocks for the printhead and HVPS. One switch in the Printhead/cover open cable is mounted in the front access door support, and the other switch in the printhead/open cover cable is mounted on the ITU light shield assembly. The HVPS/cover open cable only has one switch mounted on the front access door support and is routed through the ITU autoconnect. The HVPS/cover open cable is connected to J14 on the system board, and the printhead/cover open cable is connected to JCVR1 on the system board. POR incomplete, Close Door constantly displays This symptom is usually associated with the lower switch mounted on the front access door support and with the switch mounted in the ITU light shield. Step Actions and questions 1 Make sure that the ITU light shield is not out of position. Is the ITU light shield out of position? 2 Make sure the ITU assembly interlock switch actuator is not damaged or broken and actuates the switches correctly. Is the actuator damaged or broken? 3 Front cover assembly Does the front cover assembly close correctly? 4 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? 5 Printhead/cover open interlock cable assembly and +24 V cover switch. Make sure that the cable is correctly connected to JCVR1 and J14 on the system board. Are the cables connected correctly? 6 Make sure the front cover assembly is closed and the ITU is correctly installed. Disconnect JCVR1 from the system board, and check for continuity between pins JCVR1-1 and JCVR1-3. Do you measure continuity? 7 Disconnect J14 from the system board and check for continuity between pins J14-1 and J14-2. Do you measure continuity? Yes Properly align the ITU light shield. No Go to step 2 Replace the ITU assembly. See "ITU assembly removal" on page 4-49. Go to step 4 Replace the front cover. See "Front cover or front cover backplate assembly removal" on page 4-11. Go to step 6 Go to step 3 Install the front cover correctly, or repair as necessary Go to step 5 Install the cable correctly. Go to step 7 Replace the system board. See "System board removal" on page 4-89. Replace the printhead interlock cable/ switch assembly (see "Printhead interlock cable assembly" on page 7-37 for the part number.) Replace the ITU light shield assembly. See "ITU light shield assembly" on page 7-37. Diagnostic information 2-79