[ICOM] 765 vox/break-in question

[Tony Hwang]

ve4xt at mymts.net wrote:
> Tony,
>
> Methinks you misunderstood.
>
> He's trying to use vox for break-in on CW. When he turns vox on, typical of when you want vox to be on, the radio goes into tx, which is atypical. When he hits a paddle, the radio goes into rx for the duration of the vox delay.
>
> That's not how vox is supposed to work. It's supposed to go into tx on paddle contact, not rx.
>
> Break-in isn't voice-controlled on CW, either.
>
> This is kinda freaky. You would think a failure would mean it just doesn't work, not that it works in reverse.
>
> Did Icom provide for using a vintage keyer that was set up for positive-polarity keying? Is it a switch or menu item, maybe?
>
> 73, kelly
> ve4xt
>
> Sent from my iPad
>
>> On Dec 3, 2015, at 9:05 PM, Tony Hwang <dragon40 at shaw.ca> wrote:
>>
>> Bob TK wrote:
>>> When attempting to use break-in, either full or semi, pressing the VOX
>>> button immediately puts the unit in transmit mode.  It doesn't matter if a
>>> key or paddle is plugged in or not.  Pressing a paddle, the unit switches
>>> to receive mode and stays there until the vox delay releases.  The unit
>>> does produce a side tone for the key,  Data mode is off.  Actually, it does
>>> this regardless of the mode - e.g. same thing for SSB, AM, and FM.  Vox
>>> gain and mic gain are zero. (I currently only run CW.)  It seems to be
>>> working reverse of the way it should.  Manually switching between transmit
>>> and receive works fine.  I can't find an explanation in the owner manual.
>>> Help?  Thanks!
>> Break-in is voice controlled. No need to push button.(That is push to talk,
>> not a VOX operation)
>> Tony, VE6CGX
>> ----
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> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html
>
If it works backward then look up the schematics.  I happen to have a 
original service manual.
Maybe logic failure in the circuit. No way to figure it out without 
looking into it. I'd check the
T/R relay drivers first.