Furuno FAR-2107 Series Service Manual page 364

Key check
Key check is a function for checking the panel keys.
The drawing on the left below corresponds to the arrangement of the keys, knobs and
trackball of RCU-014 and the drawing on the right corresponds to those of RCU-015
and RCU-016 (but the power key is excluded.)
The boxes numerically displayed are used for checking of the knobs and track ball
showing changes in a range between 0 and 255. Other boxes correspond to keys and the
corresponding key is highlighted when a box is pressed.
Excluding the Power key.
Press the [F1] key 2 times
to go to the next test.
RCU-014
When the Trackball control unit RCU-015 is connected with the Remote control unit
RCU-016, both units use the display on the right. The left-side display is not used.
0 0 0 0
Fig. 6.1.6 RCU-014 Key Check
RPU-015
Fig. 6.1.7 RCU-015 and 016 Key Check
6-8
0 0 0
28
88
6.1 Self-test
0
0
0
RCU-016
RPU-016