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

[Tim Logan]

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


James T. "Jim" Rogers, W4ATK wrote:

>Tim, I think the rig defaults to PRE ON. The only bands where I routinely do
>not use the preamp are 40 sometimes, 80, and 160. The rate switch is one of
>the switches "read" by U2 on the control panel. Look for a cold solder joint
>there. Rate and A=B/SPLIT share the same pull up resistor on RP1 so if
>A=B/SPLIT does its thing the the trouble is around the rate switch. The
>switch data is returned to the MCU serially so the fact that all the other
>switches are working excludes U2 and the serial path to the MCU.
>
>Jim, W4ATK
>
>-----Original Message-----
>From: elecraft-bounces at mailman.qth.net
>[mailto:elecraft-bounces at mailman.qth.net]On Behalf Of Tim Logan
>Sent: Tuesday, January 18, 2005 7:21 PM
>To: Elec-Reflector
>Subject: [Elecraft] K2 problem at page 43 of Rev. F manual - need some
>help
>
>
>Hi folks -
>I will confess I just sent Gary a query about this, but you know how it
>goes when it is after working hours and you would sorta' like to solve
>the problem tonight hi hi! Anyway, if someone truly in the know can shed
>insight on either of the following this evening I would be most
>appreciative.
>
>I am at the stage where the K2 is pluged in for the first time (my
>favorite part!!!). All tests up to the 2nd column of page 43 have passed
>(ie up to the paragraph titled RF PROBE ASSEMBLY). Bands, change, menus
>seem to work, voltage display works, VFO works. PF! & 2 work etc.
>HOWEVER two problems have appeared. Before I go through every trouble
>shooting step in the manual maybe someone has been there done that already?
>
>1 - The PRE annunciator is turned on for all bands - even after a reset
>to factory defaults. The PRE/ATT switch works and activates relays. If I
>go through each band and turn off the PRE and then turn the K2 off and
>on again, the bands WILL retain the status of having the PRE turned off.
>However, I do not understand why it defaulted to being turned on from
>the factory settings.  Can you point me in the right direction to
>understand this?
>
>2 - The RATE switch does not change rates. I checked the secondary menu
>and the basic 3 rate default is set. Can you suggest where I start to
>solve this issue?
>
>Thanks in advance for any help.
>73/ Tim Logan NZ7C
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