[Elecraft] K2 Encoder problems continue.

[Nidge (Nigel Smith)]

Turning the dial only results in the last digit displayed flicking backward and forward.  
Initially it was thought that the encoder was at fault and a replacement was ordered.  Unfortunately
once the replacement was installed the problem persisted.  It was suggested by a Don (W3FPR)
that because the voltage on pin 14 of U3 to the encoder enable pin was low
(only 100mV or less) that the output of this drain was faulty.  Replacing the TPIC6B595N
did not rectify the problem.

I have checked continuity between the ENC-A/B outputs of the Encoder through the 
display board and back to the MCU and all checks out OK, as does the 5Volt supply.

The remainder of the front panel functions work as they should.

I must admit I am completely stuck now as to what else could cause this problem, 
especially as the radio has not missed a beat since it was constructed.

Any pointers that any of you might have would be very much appreciated.

Regards

Nidge (G0NIG)

IO93dv


A wise man speaks because he has something to say; a fool because he has to say something