K3 - front panel issue

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K3 - front panel issue

Bruce Meier-2
K3 - front panel issue

I just noticed that after a fun and uneventful (no failures) weekend of ARRL SS CW one of my K3s has developed a strange symptom.   I have done nothing other than turn the K3 off last night and then on this morning.  

Perhaps I pushed something by mistake, but I have no idea what that could have been.   I have turned the K3 off/on but have not yet done a CPU reset.

K3# 1193

Running:  2.46 code

The following buttons are failing and the others seem to be working fine.

Failing buttons:

Band / Mode: the right side of the buttons don’t work

MODE (the up side) – down works fine

TEST – does not function

BAND (the up side) – down works fine

QSK – does not work

Other buttons:

SPOT/PITCH – no impact to either function

NR/ADJ – no impact when pushed

RATE/LOCK – neither function works

ANT – locked on Ant 1, will not select Ant 2

Anyone have any suggestions???


Thanks,

Bruce – N1LN




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Re: K3 - front panel issue

ab2tc
Ouch. Did you have an electrostatic event? All those buttons have one thing in common: They are using the signal SCANADC1 which is routed to input X3 on the HC4051 analog multiplexer chip U3 (front panel sheet 7). I hope this is not the case, but if that input is zapped, you will have the symptoms you see.

AB2TC - Knut


Bruce Meier-2 wrote
The following buttons are failing and the others seem to be working fine.

Failing buttons:

Band / Mode: the right side of the buttons don't work
MODE (the up side) - down works fine
TEST - does not function
BAND (the up side) - down works fine
QSK - does not work
Other buttons:
SPOT/PITCH - no impact to either function
NR/ADJ - no impact when pushed
RATE/LOCK - neither function works
ANT - locked on Ant 1, will not select Ant 2