K2 VFO Freq Display Stuck (again)

Posted by TI2/NA7U on Dec 29, 2011; 9:27pm
URL: http://elecraft.85.s1.nabble.com/K2-VFO-Freq-Display-Stuck-again-tp7136782.html

Back in April I had a problem with the frequency not moving (just final digit flickering) and that turned out to be a broken wire to the encoder. Again the problem has cropped up with identical outward symptoms. I checked the encoder wires again, all are fine.

Here are some measurements that were asked for last time. The voltage measurements shown are only ones that differ significantly from those listed on pg. 16 of the K2 manual, Appendix E. The manual reference voltage is in parentheses.

U3: pin3 4.8 (0.8), pin 7 3.5 (2.0), pin 13 4.7 (0.2), pin 14 .1 (3.1), pin 15 4.1 (0.8), pin 18 .08 (3.6). The manual notes that all the voltages on these pins may vary.

Resistance measured at each encoder pin with the FP board removed:
Pin 1 24K, Pin 2 106K, Pin3 106K, Pin 4 29K

Can someone help me troubleshoot this? How do I tell if the encoder itself is bad?

vy 73,

Casey, TI2/NA7U