[Elecraft] Control board resistance checks on K2, help a newbie please!

[Jason Marten]

Hi everyone,

I'm trying to do the resistance checks at the end of the control board part. 
 A lot of the values seem right, but I'm not sure about some of them.  Due 
to inexperience in kit building and using a DMM, I may just be reading 
things wrong (I have built a couple of small kits).


For Q1 collector, Q2 collector, U6 pin 13, U6 pin 14, U8 pin 15 and U8 pin 
16, I get a reading of 0L on my BK Tool Kit model 2704B DMM.  This is the 
value that's normally displayed when you turn the knob to measure resistance 
and have an open circuit (i.e. the test leads aren't connected to anything). 
 Does this mean I have an open circuit somewhere, or is the 0L mean 
infinite resistance (which would be OK on the checks)?  The K2 manual says 
some DMM's will flash for infinite resistance.  I have never seen my DMM 
flash, and I can't find anything about flashing or OL in the manual.  Or, 
are there other places to look to make sure I've done things right?  
Everything appears fine based on a visual inspection (to my untrained eyes, 
at least).


Otherwise, values for P2 pin 1, U5 OUT, U4 OUT, U3 pin 8, U6 pin 29, U6 pin 
30, and U8 pin 2 seem correct.  Actually, for P2 pin 1, my DMM starts off in 
the negative and then continues to increase at a slow rate.  Is this normal?


Thanks for the help.

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RE:[Elecraft] Control board resistance checks on K2, help a newbie please

[James T. Jim Rogers]

Jason wrote:
For Q1 collector, Q2 collector, U6 pin 13, U6 pin 14, U8 pin 15 and U8 pin
16, I get a reading of 0L on my BK Tool Kit model 2704B DMM.  This is the
value that's normally displayed when you turn the knob to measure resistance
and have an open circuit (i.e. the test leads aren't connected to anything).
  Does this mean I have an open circuit somewhere, or is the 0L mean
infinite resistance (which would be OK on the checks)?

Jason, same difference, infinite resistance is open circuit. I have
forgotten exactly what my resistance checks measured at this point, but I
would say, keep on truckin'. The main thing you are looking for is something
that would measure very low, and consequently you might let the smoke out of
some part. Don't be concerned about your DMM not flashing. All DMMs behave
somewhat differently from one another. The slow change you observed on P2
pin 1 is probably the 22ufd cap charging up. Again nothing to be concerned
about. I would say you are doing great.

73 Jim, W4ATK
K2/100 #4028

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