[Elecraft] K-2 Control Board Resistance Checks Fail

[Don Brown]

Hi 

Try reversing the ohmmeter leads or changing ranges and see if the readings look better. If not I wouldn't worry about it. You are mainly looking for gross errors like very low readings or shorts. Some DVM ohms ranges will turn on semiconductors in the circuits and that will give the effect of a lower than expected reading. Changing ranges or reversing the leads may keep the semis from conducting.

Don Brown
KD5NDB
  ----- Original Message ----- 
  From: Brian Wruble<mailto:bwruble at ix.netcom.com> 
  To: dolfindon at msn.com<mailto:dolfindon at msn.com> 
  Cc: Elecraft Discussion List<mailto:elecraft at mailman.qth.net> 
  Sent: Sunday, August 08, 2004 1:07 PM
  Subject: [Elecraft] K-2 Control Board Resistance Checks Fail


  Hi all:

  I am assembling K-2 S/N 4397.  I have just completed the Control Board.  Two
  of the resistance checks fail.  The resistance between the collectors of
  both Q1 and Q2 to ground measure 454 K each.  They are supposed to show
  resistance >1meg to ground.  I have checked resistor network RP1.  It is
  installed correctly.  On RP1, the resistance between 1&2, 3&4, 5&6, 7&8 and
  9&10 are all 3.9K.  Resistance checks between 2&3, 4&5, 6&7 are all under 1
  ohm.  Resistance between 8&9 is about 1.5k.  That strikes me as an anomoly,
  but I'm not sure.

  Can anyone tell me whether this looks good, or suggest where the problem
  might be?

  Tnx.  73 de Brian W3BW


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