Chapter 8. Maintenance and Troubleshooting
136
Model PM880 Portable Hygrometer User’s Manual
8.4 Testing the Keypad
1.
If the menu is not active, press
[MENU]
.
2.
Use the arrow keys to scroll to
Service
and press
[ENTER]
.
3.
Use the arrow keys to scroll to
Test
and press
[ENTER]
.
4.
Use the arrow keys to scroll to
Test Keys
and press
[ENTER]
. The
screen appears similar to Figure 64.
Figure 64: Test Keys Window
5.
Press any key on the keypad. The corresponding box on the screen
should darken.
Note:
If the box does not darken or if the key does not appear on the screen,
contact the factory.
6.
Press
[F3]
and then
[MENU]
to return to taking measurements. If any
key does not appear on the screen, contact the factory.