Sorry, That would be an output from U3 pin 6.
73,
Don W3FPR
----- Original Message -----
From: "W3FPR - Don Wilhelm" <[EMAIL PROTECTED]>
To: "Tim Logan" <[EMAIL PROTECTED]>
Cc: <Elecraft@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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