I bought another broken radio. This is a Yaesu VX5R, great shape
but low audio out on 70cm, loose antenna connector. But works
otherwise. That's what the ad claimed. When I opened the radio
to check for presence or absence of the SU-1 barometer...I found...
...four missing potentiometers! In this picture you can see the upper
pads for the four potentiometers are intact and the lower/wiper pad
is missing for all but one potentiometer. The connector for the SU-1
is screwed up but I haven't seen one of those in years.
This picture is taken through my 10x stereo microscope.
I consulted the Yaesu VX5R service manual and found the part number
for the four potentiometers -- all 10K. They are Panasonic parts listed
at DigiKey but out of production. DigiKey did list a substitute part
number so I ordered five at $0.97 each. That was on a Friday and
DigiKey had the parts in my hands by Monday with the cheap USPS option.
Because of the missing pads I had to improvise a bit with some wire
wrap wire to extend the potentiometer wiper pad to the nearest hard
point on the circuit board.
Reassembly was uneventful. I did re-flow the solder for the SMA antenna
connector and replaced the spanner nut with an appropriate hex nut with
locking washer. That's the same fix I applied to my other VX5R years ago
with zero issues since.
Sun Jul 21 14:11:46 CDT 2013
Update: ordered some parts for the VX7R from Yaesu. Included a new
mezzanine connector to replace the one someone screwed up with their
soldering iron. Good as new!
This page last modified
Sun Jul 21 14:12:49 CDT 2013
by timc!
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