K3 Switched 12 Volts

[Hank Garretson]

For the last month or so, the switched 12VDC OUT phono jack on the back of
my K3 isn't switched. My P3 is plugged into this jack. As soon as I turn
the 12-volt power supply on, the P3 powers up even though the K3 is not on.
When I hit POWER on the K3 to power down the K3, the P3 stays on. To power
down the P3, I have to turn the 12-volt power supply off.

It used to work as advertized--switched. Ideas?

73,

Hank, W6SX
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[Joe Subich, W4TV-4]

Based on the K3 schematics (page 5), I would check Q2 FDS6375.

73,

    ... Joe, W4TV


On 2015-05-23 7:20 PM, Hank Garretson wrote:

> For the last month or so, the switched 12VDC OUT phono jack on the back of
> my K3 isn't switched. My P3 is plugged into this jack. As soon as I turn
> the 12-volt power supply on, the P3 powers up even though the K3 is not on.
> When I hit POWER on the K3 to power down the K3, the P3 stays on. To power
> down the P3, I have to turn the 12-volt power supply off.
>
> It used to work as advertized--switched. Ideas?
>
> 73,
>
> Hank, W6SX
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

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[K1GQ]

On 2015-05-23, at 19:20, Hank Garretson <[hidden email]> wrote:
>
> For the last month or so, the switched 12VDC OUT phono jack on the back of my K3 isn't switched. My P3 is plugged into this jack. As soon as I turn the 12-volt power supply on, the P3 powers up even though the K3 is not on. When I hit POWER on the K3 to power down the K3, the P3 stays on. To power down the P3, I have to turn the 12-volt power supply off.
>
> It used to work as advertized--switched. Ideas?

Lower right corner of K3 RF Board schematic, Sht. 3 of 4.

J10 = 12V In, J11 = 12V Out.
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