[RE][1000mp] HELP! FT1000MP Mark V Field

[wa4mit]

   Hello
   Two  possible  things are 1: loose wire or connector that takes signal
   from  switch  to main chassis and your movement is just enough to make
   contact.  2:  loose solder joint at the connector pins that carry this
   signal  to main chassis either of these could be a either end of wires
   or cable harness . Hope that helps.
   Morris WA4MIT
   ---------[ Received Mail Content ]----------
   >Subject : [1000mp] HELP! FT1000MP Mark V Field
   >Date : Mon, 7 Aug 2006 23:19:40 -0500
   >From : "Mike and Alicia Fanning"
   >To : <1000mp at mailman.qth.net>
   >
   >I  am having a really bizarre problem with my recently purchased used
   Mark V
   >Field.   When  I  bought  the  rig,  the  noise  blanker  button  was
   intermittent -
   >that  is,  you had to hit it several times to engage or disengage the
   noise
   >blanker (no beep and no LED toggle). I just bought the roofing filter
   mod
   >and some CW filters from Inrad, and while I was installing the mod, I
   >decided  to  fold  down the front panel and see if there was anything
   obviously
   >wrong with the PC board assembly that houses the NB button. I checked
   >continuity  on  the button, and electrically everything seems fine. I
   then
   >powered  up the radio (with the front panel still loose), and as I am
   folding
   >in  the  front panel to screw it back into place, the NB button works
   perfect
   >until  just  before  the  panel reaches vertical. If I tilt the front
   panel
   >just a few degrees outward, all is well again. I have tried this same
   >experiment  with  no  power  applied  and  a  multimeter checking the
   continuity of
   >the  NB  button  while holding down the button, and the switch always
   seems to
   >make  good  closure,  no  matter what the position of the front panel
   assembly.
   >However,  when I power it back up, same story as before - just before
   you get
   >the panel vertical, the NB button quits working. I unscrewed the two
   >"hinge"  screws  at  the  base  of the front panel assembly, kept the
   front panel
   >vertical,  and  moved  it  slightly  backward and forward (closer and
   farther to
   >the  chassis).  Again,  the  NB button quit working when I got within
   close
   >proximity of the chassis.
   >
   >There  is  a pc board of some variety with a metal can around it that
   resides
   >right  behind  the NB and filter selection buttons, approximately 3-4
   inches
   >tall and about an inch wide. I am guessing this is the shield for the
   high
   >voltage  power  supply  that runs the front panel display. My current
   theory
   >is  EMI  getting  into  a  control line and corrupting the pushbutton
   data, but
   >at this point, I am out of airspeed, altitude, and ideas.
   >
   >Has  anyone  else  seen  this behavior? Can anyone offer some helpful
   tips?
   >
   >Still scratching my head,
   >Mike, K4GU
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