[Elecraft] K2 OPT command

[Matt VK2RQ]

Maybe check R84 and particularly R85 are the  correct values, and doesn't have any dry joints? I'm guessing that Q12 takes R84 in/out of circuit in order to set bias current on Q22, and if Q12 is open circuit to set optimised bias current, and there is a problem with R85, the post mixer amplifier won't work properly? 

73,
Matt VK2RQ

> On 25 Feb 2015, at 12:35 am, Don Palmer <d.palmer at btinternet.com> wrote:
> 
> Hi hope someone can help me I have just finishing building a K2 when I
> change OPT to Optimization I lose sound.
> 
> I put it back to BATT and it all comes back, I understand that this command
> reduces the I.F.
> 
> post-mixer amplifier current by about 40 mA and automatically
> 
> forces the bargraph to use DOT mode if set for BAR.
> 
> 
> 
> Any help would be grateful.
> 
> 
> 
> Don
> 
> G6CMV
> 
> K2 Ser Num 6546 
> 
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Elecraft at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to matt.vk2rq at gmail.com