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 dont 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