[Elecraft] K3: PTT IN problem - cont'd...

[Joe Subich, W4TV]

On 4/11/2012 8:58 PM, Guy Olinger K2AV wrote:
 > Hi, John,
 >
> As far as I can tell from the schematic, the PTT_IN jack and the ACC
> jack pin 4 are a wire-to-wire connection at Q3 on the KIO3 board.

Rear panel PTT and KIO3 PTT are paralleled to the front panel (and CPU).
The first thing I would check is for +5V on the PTT jack ... if it's
missing I would check RFC 1 in series with the PTT In jack.

I've had too many failures of the serial RF chokes on the KIO 3 board
(mic - before it was bypassed in the RFI mod, Line Out, Line, In, etc.)
to trust those chokes.

73,

    ... Joe, W4TV


On 4/11/2012 8:58 PM, Guy Olinger K2AV wrote:
> Hi, John,
>
> As far as I can tell from the schematic, the PTT_IN jack and the ACC jack
> pin 4 are a wire-to-wire connection at Q3 on the KIO3 board.  Power on, see
> if both PTT_IN center and ACC jack pin 4 show the voltage to ground for
> PTT.  See if the voltage on one drops if the other is grounded.
>
> If not you have a physical path disrupted and you can trace it.  Schematics
> are available for download on the Elecraft web site.  In Adobe reader,
> using CTRL- F to bring up the search widget, type in "PTT IN" without the
> quotes will take you to all the line identifications and highlight them.
>
> 73, Guy.
>
> On Wed, Apr 11, 2012 at 8:07 PM, VK7JB<zendoc at netspace.net.au>  wrote:
>
>> Hello Again,
>>
>> Well,  the PTT IN problem persists.
>>
>> I can confirm that the K3 is not in TEST mode and that the VOX/PTT
>> parameter
>> is definitely set to PTT.
>>
>> I've taken the top of the rig and checked that all the rear panel hardware
>> is still connected and in place.
>>
>> PTT on the front panel mic connector and the XMIT front panel button work
>> normally.  It's still only the rear panel PTT IN that's the problem.
>>
>> Anywhere else I should look before I call support @ Elecraft?
>>
>> Thanks to all who replied via pm with helpful suggestions,
>>
>> john
>> VK7JB
>>
>> --
>> View this message in context:
>> http://elecraft.365791.n2.nabble.com/K3-PTT-IN-problem-cont-d-tp7457978p7457978.html
>> Sent from the Elecraft mailing list archive at Nabble.com.
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