Great report Larry,
Thanks
Cecil...
----- Original Message -----
From: "Larry Belcher" <k4cl@arrl.net>
To: "Discussion of Ten-Tec Equipment" <tentec@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@yahoo.com>
To: "Discussion of Ten-Tec Equipment" <tentec@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@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@cableone.net>
To: TenTec@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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