[Elecraft] Dead K3 RX, no Power Out

[Martin]

'Crafters,

i have a 7 year old K3 #28xx causing me a headache. I built this (and 
other K3s) myself and modified it quite often, so am fairly familiar 
with it's innards.

The issue is a dead RX ( no signals on any band, just noise from spkr) 
and no power out on any band ( display shows 0.0 Watts) after - say 30 
minutes - of just running in rx . When i hit the case with my hand - 
like a slap - rx comes back to life and power out works again. I suspect 
something has come loose causing a slack joint. Something that is 
involved in RX AND TX.
So where should i check?  Probably the synth boards?

Thanks.

-- 

Ohne CW ist es nur CB..

73, Martin DM4iM