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

[W3FPR - Don Wilhelm]

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