[Elecraft] K1 minor stumbling block...

Anthony Hardwick wentwest at mac.com
Wed Jul 1 18:27:19 EDT 2009


Hello,

I am building my K1, and have completed the first section of the  
build, and am at the DC Voltage check  stage on page 30 of the  
manual.  While the unit seems to have passed the actual "smoke test"  
aspect of the initial application of 13.1V of DC power, I am getting  
0V DC readings at P1 pin 15, and also U3 pin 6.  Furthermore, U3 pin 5  
only reads .015V DC, rather than 3.8 - 4.2

In chart form as the manual lists:

Test Point (+)	DC Voltage		My DC Voltage
P1 pin 15		5.8 - 6.2			0
P1 pin 16		(supply - 0.3V)	12.79 (correct)
U3 pin 5			3.8 - 4.2			.015
U3 pin 6			7.6 - 8.7			0


Also, In the resistance checks on page 29, I am curious about a couple  
of readings:

P1 pin 8 should read >100k.  I am getting 1.77M, which certainly is  
greater than 100k, but it seems excessively so.  Also P1 pin 16 should  
read  >1k, but I get  5.18M, which again is >1k, but it seems  
outrageously high, so I'm guessing it's tied in with my issue above.   
Also, U3 pin 5 should read  >10k, but I get another quite high reading  
of 5.15M.  Finally, on U4, I'm getting 5.13M on pin 6, and 5.6M on pin  
7.

If anyone has some ideas for me to try to track down my problem I'd  
appreciate it.  While I have tried to be very careful in treating  
static sensitive components, I wonder if I may have accidentally  
damaged one (or more).

Thanks!

Anthony, W6GC




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