[Elecraft] K2 Hi Cur

[AD6XY - Mike]

How are you measuring those voltages? In any case, it looks like the driver
is not working. You will have installed a nylon standoff on it, I would look
for a short around that area.

Mike



Bo Andersson wrote:
> 
> 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
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