[Elecraft] Help Voltage check KPA100

[jeff_elecraft at burnshome.org]

I found the problem. Q7 was inserted backwards. 

Jeff
AD9T

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
jeff_elecraft at burnshome.org
Sent: Saturday, May 15, 2004 23:09 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] Help Voltage check KPA100
Importance: High

I am at the voltage check on page 43 of the KPA100 manual. I only have 0.5 V
on the cathode of D13 instead of 90 to 150 V. 

I have listed some other voltages I have measured. Some measurements were
different at different times I measured them. They are marked with an
asterisk. 

                Cathode                Anode 
D1         50.9                         22.9
D2         76.4                         22.7
D3         16.8                         25.6
D11        0.5                          0
D12        72.5                         0

T3    
       Pin   1         13V
       Pin   2       * 47V
       Pin   3       * 53V
       Pin   4       * 12 V


R11   76 V at both ends
R12   76 V and  0V


Q6  G  72V,  S 0V,  D 0V
Q7  G  0.5V,  S 0V,  D 0V
Q8  E 99 V*, B -1.6 V, C 0 V

I redid T3 very carefully with no effect. 

What should I look for?

Jeff Burns
  



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