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2.4. Keypad ECA & IR PCBA（Refer to picture 4）
The keypad provides the user access to all of the controllable functions on the projector. It receives
keypad signals from the keypad attached to the top case, and then processes them before passing the
signals to the main board for command processing. also contains an IR receiver that collects and
processes the IR signal, which is then passed to the I/P board ECA.
2.5. Audio board PCBA（Refer to picture 5）
The audio board have one stereo amplifier to driver 15W speaker and SRS / BBE processing
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