[Yaesu] FT-1000MP Mk V drift problem

[Peter Sundberg]

Recently my FT1000MP Mk V (200W version) developed a strange fault. 
All of a sudden the main VFO starts drifting down in frequency, just 
as if the radio was scanning. The Sub VFO is not affected by this drift.

If I transmit the frequency drift stops for the full transmit cycle 
and by listening to my transmission on another radio I can hear that 
the frequency is rock stable. But when I go back to receive the VFO 
continues to  drift down in frequency. Eventually the little green 
"Main Busy" icon will drop out and I loose receive the receiver 
completely,. This icon dropout behavior is somewhat intermittent 
during the drift sessions.

Moving the VFO shuttle jog ever so slightly clockwise will stop the 
drift, and if I move it further clockwise the VFO will start going up 
in frequency. But as soon as I let the shuttle jog back to normal 
(idle) position the drift down in frequency continues.

Toggling the power switch on/off has brought the rig back to normal 
in most cases, but the problem re appears after a while. Pressing the 
"Lock" button for the main VFO will not stop the drift.

I read on the (excellent) VA3CR FT1000MP site that a possible problem 
might be a cable connected to the shuttle jog being to close to 
ground. But as I also intermittently loose the receiver as the "Main 
busy" icon drops out I think that the problem is not just the shuttle 
jog. When the drift is not there the shuttle jog works as the manual says.

Anyone out there who has experienced this with an MP and can point me 
in the right direction to find the fault?

The rig has been in my possession since it was brand new, so I know 
for a fact that this problem has never occurred before and no one but 
me has tampered with the radio :-)

73
Peter SM2CEW