Furuno FM-4000 - Manual (Page 11)

Page 11 FM-4000
Remote MIC or External Speaker Selection
By default the internal speaker is turned on, however it can be turned off to use
the external speaker, when the Remote MIC is installed.
Remote MIC procedure
1. Press and hold down the [CALL(MENU)] key until
the “Radio Setup Radio Setup Radio Setup Radio Setup Radio Setup ” menu appears.
2. Press the [ENT] key, then use the [S] or [T] key to
select “Ext Speaker Ext Speaker Ext Speaker Ext Speaker Ext Speaker .”
3. Press the [ENT] key.
4. Press the [S] or [T] key to select “Off
Off Off Off Off ” (External
speaker off) or “On On On On On ” (External speaker on).
6. Press the [ENT] key to save the selection, then press
the [16/9] key to return to radio operation.