Furuno CH-270 - Manual (Page 112)

6. MAINTENANCE, TROUBLESHOOTING
6-8
6.9 Test Pattern
A test pattern can be displayed to check for proper display of colors.
1. Press the [MENU] key to open the menu.
2. Press ▲ to choose MENU, and then press ► to choose SYS.
3. Press ▼ to choose GO TO SYS MENU.
4. Press ► to choose YES.
5. Choose TEST PATTERN and then press ► to display the test pattern. Press ► again
to change the test pattern. The pattern changes in the sequence shown below with
each press of ►.
BLUE GREEN BLACK
WHITE
RED
16 tones
of RED 16 tones
of GREEN 16 tones
of BLUE
Test pattern
To quit the test pattern, press the [MENU] key three times.