[Elecraft] Building a K1 no side tone

[Don Wilhelm]

Rick,

An additional thought - that blank display when keyed could be an 
indicator of a bad solder connection in the DC supply section of the 
K1.  You are apparently capable of searching through the schematic, so 
start at the 12 volt input and check all the points up through the 
regulators for good solder connections.  Re-flow those connections with 
a hot (750 deg F) soldering iron and see if you find any improvement.

My guess, one or more of the voltages is reading fine in receive, but 
the higher current draw when the key is depressed (transmit mode) is 
causing one of the voltages to sag to less than normal - a bad solder 
connection could cause that.

73,
Don W3FPR

Rick/WA6ES wrote:
> Assembling my K1 and got to the part where I check the side tone and all. No
> side tone in the ear buds. I also noticed that when I key the keyer the
> display goes blank. Not sure why no side tone. Checked the schematic and it
> goes back to the MCU.  Could I of missed something? I have an illuminated
> display and this stays lit. I would appreciate any help.
>
> Thanks
> Rick / WA6ES
>   
>