FW: [Yaesu] Ft-107 problem

[Eric Lemmon]

-----Original Message-----
From: Eric Lemmon [mailto:wb6fly at arrl.net] 
Sent: Friday, December 30, 2005 9:05 PM
To: 'Michael - VE3MKX'
Subject: RE: [Yaesu] Ft-107 problem

Mike,

I think you have already found the problem!  There is probably a hairline
crack in the PC board, caused by temperature cycling.  There could also be a
cracked solder joint where the switch pins are soldered to the PCB.

If you can remove the board, go over it with a 10X or 20X magnifier, under a
strong light.  You might need to gently flex the board to open the crack to
where you can see it.  Your original thought sounds like a good diagnosis to
me.

73, Eric Lemmon WB6FLY
 

-----Original Message-----
From: yaesu-bounces at mailman.qth.net [mailto:yaesu-bounces at mailman.qth.net]
On Behalf Of Michael - VE3MKX
Sent: Friday, December 30, 2005 8:38 PM
To: Yaesu
Subject: [Yaesu] Ft-107 problem

Hi,   I have a FT-107 solid state HF rig with a strange problem.  The 
rig tx output is fine, but there is an intermittent problem on receive...
For example..... I turn on the speech processor everything 
is fine.  When I turn the processor off the receiver goes deaf.   Thats 
while in LSB, USB or CW.  When I change the band switch no effect.  When I
turn the mode switch to CW-N or FSK or AM, the rig is fine. When the cover
of the rig is off, and I touch the back of the 5 switch pc board (located on
the top right) with a little pressure, the problem is rectified.  Even if I
touch the board direct or touch it with an insulated tool the problem is
gone.
 But here is the catch, I transmit CW, the rig goes deaf again!
I originally thought it would be a cold solder joint on the switch pc board
or a cracked board.

Any thoughts ?

73 Mike
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