[Elecraft] K2 tuning issue

[Bill K9YEQ]

Or, just send the unit to Don, who is very good at fixing K2's.  He goes way
back to the beginning of the Elecraft startup K2 FT group and does repairs.
If I needed mine repaired and couldn't fix it myself, I would send it to
him.  

73,
Bill
K9YEQ

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Friday, June 15, 2012 4:42 PM
To: Alan Slusher
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K2 tuning issue

Alan,

I hate to be the bearer of bad news, but I believe you are describing an
encoder failure or an MCU failure at either the ENC A or ENC B inputs.  
It is difficult to say which it may be - the encoder is the single most
expensive component in the K2 and the MCU (Control Board U6) is the second
most expensive.

Replacement/substitution is the best test to determine which of those two
components is failing.
If you can find another ham with a K2, you may be able to try using his
front panel board on your K2 - if it works, then it is the encoder - if not,
then the MCU is the most likely suspect.

If you have not upgraded that K2. you may want to do so at this time,
including the A to B mods (along with the other mods listed in the A to B
instructions, add the Keying Waveshape Mod along with a new set of IF
crystals and new firmware and your early K2 will perform just as well as a
brand new kit.

73,
Don W3FPR

On 6/15/2012 4:59 PM, Alan Slusher wrote:
> I have an older K2/10 (serial 868) which has worked very well for years.
> Today I suddenly became aware of a problem: I can't change the frequency
> using the tuning knob (yes, I did check the frequency lock).
> The final frequency number on the display blinks (eg: the "4" in 14301.24)
> (happened to have been listening on the 14.300 net) but no number changes
> when the frequency knob is turned, and the radio's frequency does not
change
> either.
> No problem with frequency change using direct frequency entry (the two
band
> buttons followed by the frequency numbers),
> and the RIT works just fine.
> I did the 456 reset before reading the instructions about saving the CAL
FIL
> numbers, with the result that I guess I will have to go back through that
> procedure (I now have to punch in 14301 and use the RIT to move to
14.301.24
> to listen on 14.300, had been spot on before).
> The K3 next to it and the Kenwood 430 below it continue to work just fine
> off the same two antennas (a vertical and an 80m dipole - both through
> tuners).
>
>
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