[Premium-Rx] WJ-8711A Front Panel Problem

[Steve Pappin]

The Aluminum chassis on these receivers develop high impedances due to age 
and oxidation. When I rework these radios I usually add the ground strap 
that actually has a mounting stud on some front panels for this purpose. I 
also add ground tags to all four corners of the top covers. Physical 
properties, age, and environment promote the natural order of decay. Another 
words everything eventually fails, some sooner than others. A company called 
GM once built an aluminum engine that used cadmium plated steel ground 
fasteners. Once the cadmium plating oxidized....

----- Original Message ----- 
From: "Michael O'Beirne" <michaelob666 at ntlworld.com>
To: "PREMIUM-RX" <premium-rx at mailman.qth.net>
Sent: Tuesday, August 28, 2012 2:36 PM
Subject: Re: [Premium-Rx] WJ-8711A Front Panel Problem


>
> Gents
>
> Am I being stupid or just old fashioned, but a propos the advice of John
> tonight, surely the panel of this radio will be bolted in quite a few 
> places
> to the chassis with plenty of bare metal-to-metal contact?  I can't easily
> conceive a design that was not.
>
> Perhaps my upbringing with AR88s, RA17s, 1772s and the usual batch of 
> green
> radios has inserted an assumption of rock solid mechanical construction 
> that
> is no longer valid today.
>
> 73s
> Michael
> G8MOB
>
> ----- Original Message ----- 
> From: "Administrator/jhafele" <jhafele at optonline.net>
> To: <premium-rx at mailman.qth.net>
> Sent: Tuesday, August 28, 2012 7:47 PM
> Subject: [Premium-Rx] WJ-8711A Front Panel Problem
>
>
>> Robert-
>>
>> Take a jumper cable with strong alligator clips and connect one end to a
>> well grounded piece of hardware on the rear of the front panel. Connect
>> the
>> other end to the main chassis. If the problem is cured, make a small
>> ground
>> wire with soldered lugs (not crimped) and attach it to a well grounded
>> point
>> on the rear of the front panel and the other end to hardware on the main
>> chassis. Make this cable as short as possible. A faulty or intermittent
>> ground connection between the front panel and main chassis appears to be
>> fairly common with these receivers for some reason. It worked for me a
>> while
>> back and I knew of another similar situation some time ago, too. It will
>> not
>> hurt to give it a try. An easy fix it if pans out.
>>
>> Good luck.
>>
>> John WA1NLJ  Fairfield, CT.
>
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