[1000mp] RE: All push buttons stopped working

[Mike and Alicia Fanning]

Hi Herman,
I just bought a Mark V Field, and when I received the unit via mail the
noise blanker button was intermittent.  You had to push it many times to
engage or disengage the noise blanker.  I removed the four screws that hold
the front panel assembly in place and loosened the bottom two screws so that
the front panel could be tilted out, and everything worked fine in this
position.  When I returned the front panel back to normal and put all the
screws back in, NONE of the pushbuttons worked.  Again, when I hinged the
front panel down, everything worked fine.  I found that as long as the front
panel was separated by about a half inch from the chassis, everything worked
fine.  There is a switching power supply running the fluorescent display
that is covered with a metal can right behind the noise blanker switch.  I
could disconnect the input to the switching supply and everything worked
fine when the front panel was folded back up.  It appeared that EMI noise
from this supply was causing problems with the pushbutton output getting
reported to the processor board.  I took off the can, disconnected the
connectors to the power supply, took out the switching power supply board,
and then reassembled everything, and now it all works fine.  My theory is
that the output connector from the supply board had a loose ground
connection, and was radiating lots of RF noise.  I'm not sure if it will
stay fixed, but it seems to have worked so far (about 2 weeks).

I hope this helps.  Let us know what you find out.

73,
Mike, K4GU

Date: Fri, 18 Aug 2006 19:52:51 +0200

From: "Herman van den Berg" <herman.vdberg at tiscali.nl>

Subject: Re: [1000mp] All push buttons stopped working

To: "All about Yaesu 1000mp" <1000mp at mailman.qth.net>

Message-ID: <200608181952510260.00306294 at smtp.tiscali.nl>

Content-Type: text/plain; charset="ISO-8859-1"





Hello,

Need some adivise....

Switched on the FT1000MP and noticed I could not change bands.

Further investigation showed none of the pushbuttons (except the "fast")
work.

Transmit/recieve ok, tuning by main/sub tuning knob ok.

Bandswitching/mode changes by (logging) software ok.

Any ideas??

TIA

Herman

PA3BFH