Gil,
The sidetone signal does inject into the audio amplifier differently
than the receiver audio.
The first thing to check is the 'dumb stuff' - did you remove the KAF2
or KDSP2 and fail to put it back in. That would create a break in the
audio path. Bid you remove the KSB2 and/or the KNB2 and not re-install
them (or offset the pins in the headers) - that would break the receive
path at the IF.
If those things above do not restore a working receiver, try the Quick
and Dirty Signal Tracing method first. You can download the document
from the Elecraft website or you may also find it at Tom Hammond's (Tom
is the author) website www.n0ss.com
73,
Don W3FPR
Gil Gibbs wrote:
I was going along fine on all my preliminary checks on my K2
"revival", got the sidetone going OK, then started in on the secondary
checks. To my dismay, I can't hear anything on any band, and I'm now
wondering if I let the smoke out of something in the receive. Not being
very good at tracing the schematic, I can't tell if the sidetone uses
the same circuit to the headphone plug that the receiver does or not.
Could I have fried a diode someplace, with that one problem of getting
the KIO2 wires "backward" when I wasn't paying attention, in the course
of setting up for the KAT100 addition?
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