[Elecraft] K1 VFO frequency does not change

[John Reed, W8DE]

Don,
C2 and D3 look to be properly installed.  I confirmed orientation from a 1SV149 data sheet just in case I mis-read the instructions.

I can adjust receive frequency with RIT, so it looks like the D4 control is working.

Since the D3 voltage is varying from 0v to 5.888v with the tuning pot, but there is no change in frequency, I'm starting to suspect a bad D3.  I don't know of anyway to check it in circuit -- at least with the tools I have.  I'll see if I can pick up a 1SV149 locally.  I considered swapping it with D6, but I don't think I can remove it without damaging it.

73,
John W8DE

On Feb 24, 2013, at 8:11 AM, "Don Wilhelm-4 [via Elecraft]" <ml-node+s365791n7570291h88 at n2.nabble.com> wrote:

> John 
> 
> Is D3 oriented correctly?  Is it well soldered? 
> Is C2 well soldered? 
> Those two components are about the only ones that would prevent the 
> frequency from changing. 
> A faulty D3 is a possibility, although that would be rare. 
> 
> 73, 
> Don W3FPR 
> On 2/23/2013 9:43 PM, W8DE wrote:
> 
> > I'm at the VFO range test in building of my K1.  I go into the CAL menu, 
> > display OSC and see a freq of 3.121 MHz.  The frequency does not change when 
> > I turn the VFO tuning pot. 
> > 
> > I checked the voltage on the VFO POT signal and it goes between 0v and 
> > 5.935v.  The voltage on D3 goes between 0v and 5.888v. 
> > 
> > Any suggestions on where I should look to determine why I cannot change VFO 
> > frequency ? 
> > 
> > 73, 
> > John W8DE 
> >




--
View this message in context: http://elecraft.365791.n2.nabble.com/K1-VFO-frequency-does-not-change-tp7570276p7570312.html
Sent from the Elecraft mailing list archive at Nabble.com.