Komatsu PC138USLC Operation & Maintenance Manual page 111

DETAILED CONTROLS AND GAUGES DETAILED CONTROLS AND GAUGES
2. Select "User Message" on the User Menu, then press switch
F6.
If you press switch F5, the screen returns to the user menu
screen.
3. "No message" is displayed on the screen.
Press switch F5 to return to the standard screen.
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OPERATION OPERATION