[TenTec] Omni VI Logic board

[chacuff]

Great report Larry,

Thanks

Cecil...
----- Original Message ----- 
From: "Larry Belcher" <k4cl at arrl.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Monday, September 03, 2012 11:20 AM
Subject: Re: [TenTec] Omni VI Logic board


> Cecil, he will be one of the greatest guys you will ever deal with.
>
> Larry, K4CL
>
>
>
> At 09:55 AM 9/3/2012, you wrote:
> Thanks Clayton,
>
> He was on my list of folks to contact since he was involved in the 
> discussions a year or so ago.
>
> Not sure if he will want to share too much of the secrets he might have 
> discovered....:-)
>
> Cecil
> K5DL
>
> ----- Original Message ----- From: "Clayton Brantley" 
> <clayton_n4ev at yahoo.com>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Monday, September 03, 2012 7:41 AM
> Subject: Re: [TenTec] Omni VI Logic board
>
>
> Cecil: There is a guy near Greenville, SC that works on those things among 
> other radios.
> You might try an email to glenn at dsmlabs.com and see what he says. He does 
> have a
>
> few of the Omni rigs for test jigs.
>
>
> 73 Clayton N4EV
>
>
>
> ________________________________
> From: chacuff <chacuff at cableone.net>
> To: TenTec at contesting.com
> Sent: Sunday, September 2, 2012 7:32 PM
> Subject: [TenTec] Omni VI Logic board
>
> I'll probably get beat up as many may consider this either a sore subject 
> or a dead horse or both, but I need to ask. (use your delete key as needed 
> please)
>
> I have been working a bit this afternoon on a VI Option 3 that I acquired 
> as a spare to my working VI Option 3. It's too nice a radio not to try to 
> fix.
>
> Has anyone gone as far as to determine what seems to be the common failure 
> on these logic boards. This one has already been worked on by someone. U21 
> has been replaced with a like part number chip but in a different package 
> with half the leads in the board and the other half wired in with wire 
> wrap wire. U20 shows signs of being replaced as well. All else appears to 
> be factory. I have checked the battery and performed system resets with no 
> effect.
>
> As I understand the radio was sent to Ten-Tec and deemed unrepairable and 
> the owner sent it to someone else who took a shot at it with no luck.
>
> I haven't begun that task of tracing signals around on the board to 
> determine if there are proper voltages, clock signals, chip selects and 
> any data moving about but will soon.
>
> The tuning encoder causes the display to count up and down as normal but 
> all other buttons functions are frozen. Another strange symptom is the RF 
> gain adjusts the noise level up and down but the AF gain control has no 
> effect.
>
> I do have a working rig but am not willing to risk it by swapping the 
> logic cards at this point. I will use it for making measurements of what 
> is normal as a point of reference.
>
> I know there was quite a bit of discussion as recently as a year ago on 
> this subject, based on a search of the archives, but never any indication 
> of a solid determination of the pattern failure. I'm sure what is failing 
> on the boards is common to most all of the routine failures...those not 
> related to lightning or other external factors.
>
> Any info you would be willing to share would be much appreciated...
>
> Thanks
>
> Cecil Acuff
> K5DL
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