Chapter 8. Maintenance and Troubleshooting
Model PM880 Portable Hygrometer User’s Manual 135
8.3 Testing the Screen
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 Screen and press [ENTER]. A
screen with a checkerboard pattern appears as shown in Figure 63.
Figure 63: Functioning Test Screen
5. Press any key. The screen should redraw with the same checkerboard
pattern. Make sure the screen redraws properly.
6. Keep pressing keys to change the screen. The PM880 will sequence
through a number of dark and light screens before returning to taking
measurements. Make sure the screen keeps redrawing properly. If it
does not, please consult the factory.
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