[Elecraft] K2 problem at page 43 of Rev. F manual - need some help

[W3FPR - Don Wilhelm]

Sorry,  That would be an output from U3 pin 6.

73,
Don W3FPR

----- Original Message ----- 
From: "W3FPR - Don Wilhelm" <w3fpr at earthlink.net>
To: "Tim Logan" <nz7c at cox.net>
Cc: <Elecraft at mailman.qth.net>
Sent: Tuesday, January 18, 2005 11:04 PM
Subject: Re: [Elecraft] K2 problem at page 43 of Rev. F manual - need some 
help


> Tim,
>
> Now that you have determined that the A=B switch works, but the RATE 
> switch does not, you should check the other side of the switch matrix - do 
> the BAND+, BAND-, DISPLAY, MENU (also ANT1/2 and NB) switches function at 
> all? If they do not, check the path for /BANK1 to pin 6 of U3 for 
> continuity. You may want to just arbitrarily re-solder the pins of U3.
>
> With power off, you can measure continuity between U2 pin 14 and U3 pin 
> 6 - it should be zero ohms with the RATE switch depressed and near an open 
> circuit with no switches depressed.
>
> If all the above checks are OK, I would be suspicious of a zapped input 
> (pin 6) on U3.
>
> 73,
> Don W3FPR
>
> ----- Original Message ----- 
>> Jim -
>> Your thoughts helped in narrowing the question. The A=B switch does 
>> function - so I pulled the rig apart and looked all around the rate 
>> switch for any possible solder joint problem but saw none. For good 
>> measure thought I reheated/soldered  the 4 mounting posts for the switch. 
>> I also checked continuity on the bottom side of the switch. In normal 
>> position each pair of top and bottom solder points show continuity. If I 
>> depress the switch and check continuity then the diagonal point also 
>> shows continuity. Alas, the rate switch and lock still do not function. I 
>> shall await with anticipation the words of Gary the Great One tomorrow 
>> :-)  The nice thing about electronics is that one way or another it all 
>> boils down to something being "on" or "off" - ie anything is solvable. 
>> Sure am enjoying building this K2 with a 4000+ serial number. My first 
>> was in the early 2000's and did not have all the mods nicely built in to 
>> the kit! Thanks for the input Jim.
>> 73/Tim NZ7C
>
>
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