[Elecraft] Unwanted audio

[Martin]

Elecrafters,
my K3 shows a strange Problem. On USB it transmits a tone at about 2khz 
above (respectively on LSB about 2khz below) carrierpoint. This happens 
even with no mic attached. The level of the tone follows the setting of 
the 2.4khz level of TXEQ. It also follows Mic Gain level.
Anyone know what to do?
Setup: Dynamic Mic on Frontpanel (or removed, doesn't matter), tap XMIT, 
listen on sdr-console.

-- 

Ohne CW ist es nur CB..

73, Martin DM4iM