288 X75HD/X75SD Installation and Operation Manual
Appendix C: Servicing
Installing a Dolby Decoder Module
If you have ordered a Dolby decoder module (X75OPT-DOLBY-1)
separately to add to your X75HD/X75SD system, you must first remove
the existing audio submodule from the main board. There are two levels
of installation for the Dolby decoder module: hardware and softkey.
To install the Dolby decoder module, follow these steps:
Hardware Installation
1. Remove the screws along the back edge and each side of the
frame’s chassis cover (see Figure C-2 on page 261), and then slide
the cover off.
Retain the screws for later use.
2. Remove the three rear connector screws that secure the audio
submodule to the frame.
See Figure C-9 on page 267 to locate these screws.
3. Remove the three screws that secure the audio submodule to the
main board.
See Figure C-8 on page 267 to locate these screws.
4. Gently lift the audio submodule off of the main board.
Be sure to lift the module off evenly to prevent the stacker
connector pins from bending or breaking.
5. Inspect the connectors on the module and main board to ensure that
all pins are straight.
6. Install the Dolby decoder module in the socket. (See Figure C-24
on page 289.)
7. Press down the edges slowly until you hear the metal clips click.
8. Reinstall the audio module gently and install all screws.
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