Furuno GP-3500F - Manual (Page 226)

12. MAINTENANCE & TROUBLESHOOTING
12-8
12.6.2 Keyboard test
The keyboard test checks the controls on the display unit and remote controller
for proper operation.
1. Press the [MENU] key to show the main menu.
2. Press the [0] key to show the SYSTEM SETUP menu.
3. Press the [6] key to show the TEST & MEMORY CLEAR menu.
4. Press the [2] key to show the KEYBOARD TEST.
0-6. KEYBOARD TEST
PRESS CLEAR KEY 3 TIMES TO FINISH THE TEST.
REMOTE CONTROLLER
Keyboard test
5. Operate each control on the display unit and remote controller one by one. A
key is functioning properly if its on-screen location “fills” in black when the
key is pressed. For the [ENTER] knob and trackball, rotate them to show
their X-Y positions digitally, and push the [ENTER] knob to confirm its
function. Note that the [POWER] key cannot be tested.
6. Press the [CLEAR] key three times to finish the test.
7. Press the [MENU] key for several times to close the menu.