[Elecraft] K1 deaf after KNB1 installation

[Bill K9YEQ]

K1 is not off topic, I am very interested and will build one soon.


73,

Bill
K9YEQ
K2 #35; KX1 #35; K3 #1744; mini mods
ATS-3B


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Mike Morrow
Sent: Friday, December 25, 2009 4:14 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] K1 deaf after KNB1 installation

Byron wrote:

>My K1, #2799, build was going along swimmingly until I built
>and installed the KNB1 module...now my poor K1 is deaf

Hi Byron,

First, it would likely be best to mark a posting such as yours
with an "OT" for being clearly "off-topic" on this "All K3, Only K3,
All The Time" list!  :-)

Seriously, though, I'll assume that you had to install the RF board J1
connector as part of your KNB1 installation process.  In other words,
the J1 connector was not in place earlier when your K1 was working.

If that assumption is correct, then I'd look very very closely at the
K1's RF PCB soldered connections to the J1 connector.  Especially, check
for no solder bridges to ground (pins 5, 6, and 7) from signal pins
3, 4, or 8.  My money says that during J1 installation, either pin 4
or pin 8 got shorted to ground with a solder bridge.  Check pins 3, 4,
and 8 with an ohm-meter to ground (pin 5, 6, or 7).  If you get a very
low resistance, then that's your problem.  And since this is at the
RF board connector J1, the same symptoms would show regardless of
the KNB1 being in place.

Good luck.

Mike / KK5F
______________________________________________________________