[TenTec] OMNI VI illness

[Bob McGraw - K4TAX]

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
>>> _______________________________________________
>>> TenTec mailing list
>>> TenTec at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>
>>>
>>
>>
>>
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>
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