[Premium-Rx] New WJ8617B problems

[Geoff Greer]

  You are probably a victim of 1 or more "red end" tantalum capacitor 
failure(s).  The smoke was probably from burnt resistor(s). You could also 
have some board damage.   I would suggest replacing them with milspec M39003 
type caps.  These are hermetically sealed so you will not have burned 
circuit boards if the cap fails.  These caps show up on EBay at quite 
reasonable prices.  BTW, the high voltage supply uses a couple of the caps. 
I would change those out even if they seem to be OK.  If you are lucky the 
HV assembly wil not be soldered shut.  I have seen arcing problems with 
these supplies, a little bit of Corona dope does wonders in curing that.

Geoff


----- Original Message ----- 
From: "Gedas" <w8bya at mchsi.com>
To: <premium-rx at ml.skirrow.org>
Sent: Sunday, October 08, 2006 7:31 PM
Subject: Re: [Premium-Rx] New WJ8617B problems


>I am glad you solved your problem.  Now, this is funny and sad at the same
> time....I turned on my 8617B to run the test for you and I notice that the
> pan display is sweeping all the way to the right and only about 1/2" wide.
> As I stare at it thinking, it just needed some more warm up time, I notice
> huge amounts of thick smoke rising from the receiver.  Powered it down as
> quick as I could.  Looks like your 8617B is fixed and mine needs fixing.
> Let the fun begin.
> Gedas
>
> Gallery http://gedas.cc
> Web Page http://www.w8bya.com
>
> ----- Original Message ----- 
> From: "spencer bahner" <spencer12345 at msn.com>
> To: <premium-rx at ml.skirrow.org>
> Sent: Sunday, October 08, 2006 6:43 PM
> Subject: [Premium-Rx] WJ8617B problems
>
>
>> Thanks to all who sent feedback on areas to target with my 8617B tuning
>> problem. Turned out to be some form of contamination on the optical
>> encoder.
>> Took it apart eneough to visualize the encoder wheel (with its TINY
>> slots),
>> the reflecting mirror and the light source/sensor combo. No visible crud
>> but
>> dusted it all off and ran some paper over the mirror and sensor and no
>> more
>> problems. Should be good for another 25 years!
>>
>> Spencer Bahner N7UMO
>> Seattle
>>
>>
>>
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>
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