http://elecraft.85.s1.nabble.com/Re-KB1VBF-Re-K2-Hi-Current-still-tp7303283p7303342.html
both ends), and from there go to the connector J7 pin 10. From that
voltage at Control Board U6 pin 2. If it does, then CB U6 has a damaged
input pin. If the voltages between D9 cathode and CB U6 pin 2 are
have been damaged by static during assembly. Such damage may not be
>
> Gary and Don:
>
> No KAT2 installed: (I am building it but have not finished it yet)
>
> There is about 3.53 volts on D9 when TUNE is pressed, 0 volts
> otherwise. I set the power level to 15 watts but, as I said before,
> roughly 20 watts comes out no matter what I set the power to, and the
> HI CUR warning is always there with "P 1.0" power indicated.
>
> Do I check the MCU next? Is that on the Control Board? Could the
> KDSP2 board be causing a problem?
>
> Thanks again guys!
>
> Brian KB1VBF
>
> ------------------------------------------------------------------------
>
> *From: *"Gary Surrency" <
[hidden email]>
> *To: *"b denley" <
[hidden email]>
> *Sent: *Monday, February 20, 2012 3:05:13 PM
> *Subject: *KB1VBF Re: [Elecraft] [K2] Hi Current...still
>
> Don't connect a KAT2, KAT100, or KPA100 until the power control
> problem is fixed, since any of those can have damage that affects the
> power control.
>
> Damage to D9 on the RF board or to the VRFDET input pin 2 of the
> 18C452 MCU can cause a loss of power control too. If OK, there should
> be up to about 4VDC at the cathode of D9 when transmitting at full
> power (14-15 watts).
>
>
> --
> 73, Gary AB7MY
>
> =========
>
[hidden email]
> Elecraft Technical Support
>
>
> On 2/20/2012 11:58 AM,
[hidden email] wrote:
>
> Thanks Gary. The rig does put out power as it turns out (plenty
> in fact) but is not controlling that power. High power comes out
> at any power setting with the associated Hi Cur warning. See Don
> Wilhelm's latest advice below.
>
> Brian KB1VBF
>
> ------------------------------------------------------------------------
>
> *From: *"Gary Surrency" <
[hidden email]>
> *To: *
[hidden email]
> *Cc: *"Don Wilhelm" <
[hidden email]>, "b denley"
> <
[hidden email]>, "Wayne Burdick" <
[hidden email]>,
> "
[hidden email] Wilhelm" <
[hidden email]>
> *Sent: *Monday, February 20, 2012 1:20:22 PM
> *Subject: *KB1VBF Re: [Elecraft] [K2] Hi Current...still
>
> Try all bands.
>
> Make sure no relays have a soldering iron burn.
>
> Check the t-r switch has no reversed diodes or Q2 is reversed. The
> pictorial in the back of the manual shows which way these parts go.
>
> An open RFC6 will cause self oscillation. This part is under Q6 on
> the bottom of the RF board.
>
> Check all parts are correct in the Q5-Q8 area.
>
> Check D9's cathode has about 4VDC at 14-15w if the rig will
> produce that power level.
>
> Check the BNC connector does not have a broken ground pin. I have
> seen that before.
>
> --
> 73, Gary AB7MY
>
> =========
>
[hidden email]
> Elecraft Technical Support
>
>
>
> On 2/18/2012 10:33 PM, Don Wilhelm wrote:
>
> Brian,
>
> Is this condition on one band, or does it exist on all bands?
>
> The winding of T4 will affect all bands,
> A Low Pass Filter problem will affect one or two bands.
>
> Transmit into a 50 ohm dummy load - then:
> Quickly measure the voltage at the base of Q7 or Q8 during a
> TUNE. It should be between 0.60 and 0.64 volts.
>
> Count the turns on T4 carefully, the green winding should have
> 2 turns and the white winding should have 3 turns. The "link"
> wires should go from the front of the transformer directly to
> the back (they do not wrap through both holes)..
>
> 73,
> Don W3FPR
>
> On 2/18/2012 10:15 PM, Wayne Burdick wrote:
>
> Did you check the winding on the PA transformer? If the
> impedance were much too low, the current could be too
> high. Could also be excessive bias current. What's the
> current drain in transmit mode, key up (i.e. tapping XMIT
> but not the key)?
>
> Wayne
> N6KR
>
> On Feb 18, 2012, at 7:09 PM,
[hidden email] wrote:
>
>
>
> After getting the HiCur message, I replaced the two PA
> transistors, the associated hardware, Q11 and Q13, and
> R50. Unfortunately I stll get the same message:
> HiCur when I press TUNE with power any higher than
> about 1.5 watts inot a 50 ohm dummy load. Any have
> any ideas about what else might cause this problem?
>
>
>
> Brian KB1VBF
>
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>
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