i ve a panasonic KX-T2006 , the extension doesnt ring , only the led in the main unit light up , with no ringing , & the main unit ring when the line turned to it (the main switch) , this problem disappear for an hour when i just disconnect power & reconnect it again . i tried to check & clean it from the inside from dust & so ....
should i check relays ! Capacitors , or Power supply output voltage !?? please advice