[Elecraft] K3 - RTTY keying quit - FSK D

[Pfizenmayer]

Worked RTTY fime Thursday night - started to work a W1AW on RTTY last night and PTT was working but  only carrier no FSK. Using direct FSK not AFSK.

 FSK D confirmed on menu. Shorting FSK pin 4  to ground - no freq change -  open circuit voltage on pin 4 about 3.6 volts but source impedance VERY high - I can pull it way down with just leakage of my fingers on the connector .Pulled connector and checked DCR from the RCA jack dongle I made  for PTT, KEY OUT , AUX , and FSK and shows solid connection to pin 4. 

Did an EEINT and put in previous config setup - no change - did another EEINT and put in current setup - no change. 

Am still crosseyed from  trying to trace where the FSKD (think its called DIGI1) goes to - was hoping  maybe a little SMD xsistor but looks like its into an IC .

Any idees of what to look for next ?? I can replace a little 3 or 4 termninal SMD device but not an IC - hope its not a trip to the Mother Ship. 

Guess maybe I wil try AFSK today . 

73 Hank K7HP