Yes the vacuum desoldering system is great.
The board does not plug in. Only cables. The board is held in place by 4
screws.
The relay coils are parallel on the board. Applying 12V to one does apply 12v
to both. Other than physically removing one relay I see no way to check just
one and not energize the other one. Of course one could cut the PC trace
between the 2 but then you'll have board repair to do. NOT A GOOD IDEA.
Just get 2 relays, remove and replace 2. That's the smartest thing to do.
Bob, K4TAX
Sent from my iPhone
> On Oct 26, 2014, at 8:01 AM, Dave Edwards <kd2e@comcast.net> wrote:
>
> 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@comcast.net>
>> To: "Discussion of Ten-Tec Equipment" <tentec@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@comcast.net>
>>>> To: "Discussion of Ten-Tec Equipment" <tentec@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@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/tentec
>>>>
>>>>
>>>>
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>>
>>
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