Rune,
It is most likely a bad connection. If the KAF2 or KDSP2 is installed,
reseat those options to wipe away any oxidation on the pins.
When the loss of AF appears, do you still have sidetone (use the SPOT
button in CW mode)? If so, the AF amp is OK - follow the path from the
IF amplifier output on the schematic and reflow the soldering on all
components in that path.
73,
Don W3FPR
On 2/9/2021 8:19 AM, Rune Edberg via Elecraft wrote:
> Using a second-hand Elecraft K2, QRP rig. No. 5810. Works like a charm since several years. However, sometimes the AF speaker / phones sound disappears for any apparent reason. S-meter still moving! Have to reboot the K2 with the on/off switch, sometimes more than once, to get the AF running again. This became a big nuisance after starting operating FT8 as the computer connection goes down and I then also have to reboot the computer. AF is routed to the computer via a constant-level output (put in by the original K2 owner) and thus also subject to the same error.
>
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