[Premium-Rx] New WJ8617B problems

[Gedas]

Hi Geoff, thanks for the much needed suggestions.  I think at this point I 
need to find a good schematic and calibration manual for my radio.  Any 
ideas where I might be able to get one?
Gedas

Gallery http://gedas.cc
Web Page http://www.w8bya.com

----- Original Message ----- 
From: "Geoff Greer" <greer86 at attglobal.net>
To: "Gedas" <w8bya at mchsi.com>; <premium-rx at ml.skirrow.org>
Sent: Sunday, October 08, 2006 8:17 PM
Subject: Re: [Premium-Rx] New WJ8617B problems


>  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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>>
>>
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>>
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>>
>