[Elecraft] K3 Startuip Problem

[Bill W4ZV]

Jeff Maass wrote:
> 
> 
> My electric company had a service-related power outage in my area for a
> few hours this
> morning, and so the DC supply for my K3 was turned off for one of the
> first times in
> several months.
> 
> When I powered the supply again and tried to turn on my K3, the display
> does not light but
> all of the green LEDs do light up. The "Power" button does not shut down
> the radio. After
> cycling the DC supply and K3 on-and-off several times, the K3 finally
> booted normally.
> 
> Any idea what this might be and how to remedy it?
> 

Have you installed the 12 V Sense mod below:

http://www.elecraft.com/K3/k3_app_notes.htm

"This modification adds a diode to the KPA3 12V sense circuit to hold the
voltage to no more than 0.6V when the K3 is turned off. Without it, some K3s
refuse to turn off when the POWER button is tapped because the 12V sense
circuit does not drop to a low enough level to shut down the K3’s MCU.

The diode is a common leaded part. No work with SMDs is required. A minimum
of disassembly is required and no boards need be removed to perform this
modification."

73,  Bill

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