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Re: [TenTec] Omni VI Plus (564) 10 meter xmit dead

To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Subject: Re: [TenTec] Omni VI Plus (564) 10 meter xmit dead
From: "John Cox" <jecox@tri-lakes.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 14 Dec 2007 16:35:38 -0600
List-post: <mailto:tentec@contesting.com>
Hi Pete
Did you try a power on reset of the box?
My Omni VI + 160 meter band went south and ten-tec said to try that first 
and it fix it.
We tend to forget that it is a computer controlled box.
John Cox  KC0YAI
Bona, Missouri
----- Original Message ----- 
From: "Peter Inskeep" <pinskeep@yahoo.com>
To: <tentec@contesting.com>
Sent: Friday, December 14, 2007 1:51 PM
Subject: [TenTec] Omni VI Plus (564) 10 meter xmit dead

> As last weekend's 10 meter contest started I discovered that my Omni VI + 
> 10 meter transmit is "dead."  The receive may be diminished as well, but I 
> am not sure of that. I quickly switched to another rig.
> When the rig is turned on from cold, ie., power supply turned off until 
> rig turned on, I get about 40 watts on both the internal meter, and on my 
> tuner's meter.  This quickly drops to virtually zero, within seconds.
> All other bands work fine.  All four sections of the 10 meter band are 
> dead.  Ie., 28.0 to 28.5, 28.5 to 29.0, etc.
> I have pulled the rig apart.  I suspect that the problem is on the Xtax 
> Osc. - L.O. Mixer board (81595).  This board is located in the box under 
> the 81595SM and 82870 boards on the top left side of the rig.  It contains 
> the band crystals and a whole bunch of switching diodes, among other 
> things.
> Thus, it is almost impossible for me to test anything with the rig 
> running, as I have to remove those two boards and the aluminium plate to 
> get at the Mixer board.
> I suspect the L.O. Mixer board because it seems to be the one place where 
> 10 meter signals are completely separated from other band signals.  In 
> fact, I am most suspicious of Q4 and/or Q5 on that board.  I will replace 
> them to see if that does it.
> I have checked diodes, in circuit, until my eyes are crossed.  I have 
> checked solder traces until my eyes are recrossed.  I've found nothing 
> that looks bad, and nothing that does not check continuity with my vtvm.
> Having bored you will all of the above, if you are still with me, I have 
> two questions.
> First, has anyone had the same symptom on their Omni VI Plus?   If so, can 
> you suggest a fix.
> Second, is there some other circuit where all four of the 10 meter 
> circuits are separate that I have not been able to discover?
> I have not pulled the front panel off to see if the 10 meter button is 
> "broke."  I think not because, first, it enters the "9" digit without 
> fail.  Second, it does kick in 10 meters when the rig is cold, and the 
> display does go to 10 meters.
> Finally, I know that the intelligent thing to do is to box it up and send 
> it to Ten-Tec.  They will not only fix this problem, but reallign it and 
> make it better than new.  If the two transistor replacements don't do it, 
> and no one on the reflector has a solution that I can implement at home, I 
> will send it back to Ten-Tec after the holidays are over and UPS is back 
> to moving cartons instead of chucking them due to the holiday rush.
> I am not a frequent poster to the reflector, but I do monitor it, so, if 
> you can offer any suggestions, I will be most appreciative.  My XYL's 
> solution to this is to send the rig back to Ten-Tec in trade for an Omni 
> VII.  Not a bad idea!
> Thanks,
> Pete, no2d.
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