Encoder Knob; Volume Knob; Rf Gain Knob; Hook - Furuno FS-1575 Service Manual

6.5 SERVICE: TEST
Step-3) C-CPU PCB (3/4) Window
Pressing the [ENTER] knob will switch the display to the (3/4) window and conduct
key tests.

9. ENCODER KNOB

Turning the [ENTER] knob will change the loop from "0" to "65535" in steps of "1".

10. VOLUME KNOB

Turning the volume dial will change the volume from "0" to "510//520." An analog
voltage value from the volume knob is converted into a digital value.

11. RF GAIN KNOB

Turning the RF gain knob will change the gain from "0" to "40" in steps of "1."

12. HOOK

This test menu is used to detect whether the handset is put on or off the hook. ON- or
OFF-hook is detected with a magnet built in the handset hanger and a magnet switch
built in the handset.

13. PTT

This test menu is used to detect whether the handset PTT key is set to ON or OFF.

14. KEY mark

Pressing the KEY will turn the key display in question from black to blue.
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