Lexmark X734de Service Manual page 413

c. Reconnect all the connectors to the system board. Use the diagram below for a guideline.
Warning: Be careful reconnecting the printhead ribbon cable (D) and the MDC cable (E). Ribbon cables
can be damaged easily and should be handled carefully.
5.
Install the toroids, hard disk, modem, and wireless network card, if appropriate.
6.
Replace the rear cover, rear frame cover, and the left cover.
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Repair information