[Elecraft] help on alignment and test, part II

[Lloyd Lachow]

 OK, I got to p.60. Plugged in the freq. probe, got it
to TP3, did the CAL thing, and got 0000.00. Tried to
measure with my DMM's freq counter with that still
connected...and while doing this, the K2 read about
10.96 something, changing rapidly. Disconnected the
DMM from TP#, the K2 read 00000.00 again. The DMM,
meanwhile, read 12.01 at TP3.

  I tried the VCO test at TP1, got 0000.00. Went to
troubleshooting, using my RF probe, checked the
Reference Oscillator output, got 0.767 Vrms. VCO
output = 0.418 Vrms. VCO Buffer output = 0.677 Vrms.
All seemed good!

  TP2 showed something, didn't write it down, but it
was, like, 4912 or something...showed my
carefully-built probe was working, I suppose.


  Then I checked some voltages, and found some wacky
stuff. On U4, pin 5 was zero. pin 7 was 5V. pin 8
showed rapid variation. Others were ok.

  On U5, pin 1 was 5V, and pin 2 was zero V!!! others
were ok. Yow!

   on U1, pins 9 and 10 showed rapid variation, others
were ok. U2, U3, U6, U8, U11 and U12 were all ok.

  Q17 had a D of 1.637, others ok. Q18 had S of 1.615
and D of 7.92.

   That's all I had time to check...hopefully, it's
enough for someone to suggest what to look for.

  Thanks!

   LL/K3ESE


		
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