Lexmark X644E Service Manual - Page 187

7002-xxx LCD touchscreen contrast control service check-model X642e Note: If the contrast control only works over part of its travel, replace the left operator panel cover assembly. See "Operator panel left cover assembly removal" on page 4-61. FRU 1 UICC card #1 to UICC card #3 cable (UICC 8-pin cable) 2 UICC card #1 to UICC card #3 cable (UICC 8-pin cable) 3 Operator panel left cover assembly Action Check the cable for correct installation to J1 on UICC card #3 and to J14 on UICC card #1 (operator panel card). Check continuity of the UICC 8-pin cable. If correct, go to step 3. If incorrect, replace the cable. Replace the operator panel left cover assembly. See "Operator panel left cover assembly removal" on page 4-61. If this does not fix the problem, replace the operator panel right cover assembly. See "Operator panel right cover assembly removal" on page 4-64. LCD touchscreen display service check-models X644e/X646e LCD touchscreen display complete dark operator panel LED on CAUTION When you see this symbol, there is a danger from hazardous voltage in the area of the product where you are working. Unplug the product before you begin, or use caution if the product must receive power in order to perform the task. Note: The LCD touchscreen display can be checked by entering the Diagnostics Menu, selecting HARDWARE TESTS, and running the Panel Test. FRU 1 LCD inverter 8-pin cable Action Check the inverter 8-pin cable for correct installation to the operator panel card (J13) and to the LCD inverter card (CN1) assemblies. If no problem is found, go to step 2. 2 LCD inverter 8-pin cable Check continuity of the inverter 8-pin cable. If incorrect, replace the cable. If correct, go to step 3. Diagnostic information 2-149