[Elecraft] K2 Hi Cur

[Bo Andersson]

Hi!

After building and installation of K60XV, I got problem with Hi Cur when testing transmission.

All around K60XV, as receive and settings for transverter acts as exspected.

Regardless if I set Power to 0,2 or 15 Watts or changning Cal Cur, I got Hi Cur and I can see on may power supply, radio drawing 3,5 amp.

I make some test from K2 Manual appendix E, Troubleshooting 

Page 13 around ALC     Power Control Test VPWR reading was 1.10 VDC Expected 0.7 - 2.5 VDC, no problem

Page 14 Pre-Driver, Driver and PA

Driver Input Reading: 1.71 Vrms Expected: 0.026 Vrms
Driver Output Reading: 0.416 Vrms Expected: 1.8 Vrms
PA Input(Q7) Reading: 0.8 Vrms Expected: 0.38 Vrms
PA Input(Q8) Reading  0.39 Vrms Expected: 0.38 Vrms
RF Detector Input Reading  0.4 Vrms Expected: 2.0 Vrms

It seems that one or both PA transistor could be defective.

Measure Diode/Transistor as point 7.

+ = positive lead to
-  = negative lead to

Q7

B C E
+ 0.68K 0.68K
- 6.0k 0.85K

Q8

B C E
+ 0.68K 0.68k
- 6.0K 0.85K

I hope some one can read and understanding my measure and perhaps have an idee around this problem.

73's Bo/SM6FPG