[Elecraft] K3 - FSK in not working - KIO3 boards NEVER MIND

[Pfizenmayer]

Thanks -- I pulled it out and there they are -- 73 Hank K7HP 


  ----- Original Message ----- 
  From: Pfizenmayer 
  To: elecraft at mailman.qth.net 
  Sent: Saturday, April 19, 2014 12:03 PM
  Subject: K3 - FSK in not working - KIO3 boards 




  The voltage on the FSD in line is "floating" at about 3.2 volts and even finger leakage pulls it down so its from a very high sourfce impedance and does niot key the FSk. 

  I have tracked from J23 ACC connector  to P90/J90 on the KIO3 Dsub RS232 IO board  the  PTT in , KEY out , AUX and all are the nominal 220 ohms shown on the schematic . Pin 16 FSK in is about  6 megohms. This would indicate that R2   220 ohms is open or something along that line is open . 

  My question is where the  heck is R2 ? Or maybe more to the point - Is R2 on the back side of the horizontal board marked  "KIO3 Remote I/O Module "  with J23 (15 pin) and J24 (9 pin RS232) that then plugs into J90 on the KIO3 vertical Main board ?

  I hate to pull all that apart and find its somewhere else ?? Of course it could be a lousy solder joint somewhere in the run (incidentally the 5v is solid at pin 20 J90 and at pin 3 of J35/P35 on the RF board. 

  Thanks -  if I don't hear anything guess it will be tear it apart and see ! 

  Hank K7HP