NEC Barracuda Service Manual page 104

Barracuda PDA Maintenance
7.6.1.5 LED
Test equipment: none.
Purpose: Verify the buttons function.
Test Method: The red LED will blink and the red LED will keep lighting after you execute this item.
Leave method: Touch pen, Serial port, Home button
--- Provide for LED test as below.
When this item is executed, LED should blink.
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