Graziano,

Does the DISPLAY button work normally? If so, there is no problem with the button itself.
The difference between a tap and a hold is determined by the MCU.

73,
Don W3FPR

On 5/22/2017 6:13 AM, Graziano Roccon wrote:
Hello,

a friend of mine have an Elecraft K2, always working perfectly.
Yesterday, without any apparently motivation, the smeter stop to show RF Power 
level during transmit.

The K2 emit power without problem and the external wattmeter show the right 
power.
The smeter is working in RX, but not working in TX.
The K2 is mainly used in CW, so the switch button RF/ALC is not working.
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