[Elecraft] K3 Mini - Loss of bias - side mic jack

[Frank VO1HP]

It appears I have lost the bias supply going to the side Mic jack on my K3
Mini.   There is no bias voltage on the tip of a test cable.  However there
is 4.7-4.8 volts appearing on pin 6 of the 8 pin front panel mic connector.

I note that turning on the Mini from a cold start I see 3.8vdc on the tip
of the test cable but it only lasts for a few seconds and very quickly
decays to zero.

The Menu setting rP.L bIAS is configured and turning the bias off/on by
tapping 2 does not effect the volatge 4.7 on pin 6 .  It is always on.

What do I do.?  I am not thrilled about taking the Mini apart as I have
ZERO technical information about how to dissaasemble it.  Nor do I have a
schematic to help ID where the fault may be.

I have an outboard bias box that came with my CM500 so I guess I can use
that in a pinch.

Any comments?

73 Frannk VO1HP
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