Pioneer CX-3250 Service Manual page 125

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23. Speech Microphone Line Test
Perform confirmation of speech microphone input line for audio recognition.
Input from the microphone is output from guidance audio line via AC97 Codec.
The confirmation of muting circuit on the guidance audio line is also confirmed by this test.
<<Screen Description>>
GMUTE : Mute setting on guidance audio line.
During "L" setting, microphone input is output from the front speaker.
During "H" setting, muting status is set.
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