[TenTec] Omni VI Logic board

[Larry Belcher]

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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