[TenTec] OMNI VI illness

Sun Oct 26 09:01:34 EDT 2014

Bob....I have a electric vacuum-type solder remover station...that 
should help.
So the boards have all plug in wires...I am guessing the board plugs in 
as well?
I also have the owner's manual, and looked at the schematic. It would 
seem that with the board in hand, if I put 12 volts (or whatever the 
coil is) on that parallel coil line for K4 and K5, I can then measure 
which relay is not closing....before I start wielding the solder iron.
This is a mint Omni VI+, that has never had the lid popped open, but I 
guess no rig is immune to the strike of Murphy!!
....Dave
PS...Thanks so much for your help, and the rest of the group!

On 10/25/14, 9:42 PM, Bob McGraw - K4TAX wrote:
> The board will need to be removed from the radio.  It is a tight fit 
> between a shield and the back panel.  Both top and bottom covers will 
> need to be removed as well as the bracket that supports the speaker.  
> Everything plugs in and cables are or were or should be numbered.  
> Take care in removing the relays.  Too much heat and one will lift the 
> solder pads, creating another issue to be resolved.
>
> Yes, either K4 or K5 can be bad, i.e. open coil is typical.  There 
> could be other issues not causing the relays to switch for those 2 
> bands but it is more common for the coil on a relay to open.   One 
> relay being K5 switches the input to the filter section from the PA 
> and the other one K4 switches the output of the filter section to the 
> TR relay.  Both 15M and 17M use the same filter section.
>
> Yes, you can remove one relay and measure that one.  Then you can 
> measure the one remaining on the board.  As my luck goes, the one I 
> remove is always the good one.
>
> If you don't have a schematic, I suggest you obtain one.  The 564 
> manual is available for download on the Tentec Website under DOWNLOADS 
> and then Obsolete-Manual-Downloads.  Scroll down to the 564 and click 
> on the link to the right that says 564 Manual.
>
> See page 4-3 for the schematic of the Low Pass Filter board.
>
> 73
> Bob, K4TAX
>
>
> DISCLOSURE:
> All opinions expressed herein are solely those of K4TAX and do not 
> reflect opinions, ideas, policy or practice of other persons or 
> companies including Ten-Tec / R F Concepts.
>
> This is to inform all persons I am a Ten-Tec Ambassador and I receive 
> compensation according to the Ten-Tec Ambassador program. In addition, 
> I serve as a volunteer beta test person to Ten-Tec for the Omni VII, 
> Eagle and Argonaut VI radios.  I am not an employee of Ten-Tec and 
> hold no employment relationship, no financial or other interests, nor 
> do I conduct any commercial business, direct or indirect, with Ten-Tec.
>
>
>
>
>
> ----- Original Message ----- From: "Dave Edwards" <kd2e at comcast.net>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Saturday, October 25, 2014 8:17 PM
> Subject: Re: [TenTec] OMNI VI illness
>
>
>> Bob...is the low pass filter board such that the relays can be 
>> removed with the board in the radio...or does the low pass filter 
>> board have to come out?  Am I correct in that EITHER K4 or K5 could 
>> be bad causing both bands to go out?   So, if I replaced them 
>> both...I'd solve the problem...or take one out, then I can measure 
>> them individually...one out, and one in the radio...hoping that I 
>> removed the bad one. Is that about right??
>> ....Dave
>>
>>
>> On 10/25/14, 9:01 PM, Bob McGraw - K4TAX wrote:
>>> Most likely a relay coil open being either K4 and/or K5 on the Low 
>>> Pass Filter board.  Both bands, 17M & 15M,  use the same filter 
>>> section which is switched by those two relays.  This is the vertical 
>>> board at the back of the radio.
>>>
>>> If you pull them to check them, replace them.  Since the coils are 
>>> wired parallel, it is a bit of a challenge to figure just which one 
>>> is bad with in circuit measurements.  My luck,  I usually remove the 
>>> good one first. Go figure!    Tentec Service has replacements.  
>>> There's 12 of them on the board. Unless you have time and money to 
>>> replace all 12, I'd order 4 pcs and replace 2 keeping 2 as spare.
>>>
>>>
>>> 73
>>> Bob, K4TAX
>>>
>>>
>>>
>>>
>>> ----- Original Message ----- From: "Dave Edwards" <kd2e at comcast.net>
>>> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
>>> Sent: Saturday, October 25, 2014 6:41 PM
>>> Subject: [TenTec] OMNI VI illness
>>>
>>>
>>>> Can anyone suggest if there is anything to check on this problem?
>>>> OMNI VI+, otherwise working fine, but....
>>>> No output on 15 or 17 meters.
>>>> I can hear the signal on another receiver, but no output at all.
>>>> Receive OK, and all other bands transmit fine.
>>>>
>>>> Is there something switched in for just 15 and 17?
>>>>
>>>> Thanks for any thoughts!
>>>>
>>>> ....Dave
>>>> _______________________________________________
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>>>>
>>>>
>>>
>>>
>>>
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>>
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