You are right, Bill,
I have three K3s and the two oldest ones had old synths. I upgraded one
of them and kept one AS-IS so I could compare them. I do have two old
synthesizers. If worse comes to worse, I can plug one in and then I
think I need to do some form of synthesizer calibration . It has been so
long, I forgot! I did want to see if I could fix this one.
Dave K1WHS
On 3/24/2020 5:17 PM, Bill Steffey NY9H wrote:
from looking at your pictures on QRZ it looks like you also have a
k3... I would imagine you upgraded the synth boards ????
yes??
bill
On 3/24/2020 12:57 PM, David Olean wrote:
For all you tech gurus,
I am trying to fix an old K3 that belongs to my brother. He has
serious medical issues and I was hoping to fix his K3 so he can use
it and be on the air in between chemo treatments. He is very
isolated and a working ham rig would be a big help to him. I am not
having much luck with tech support with all the virus concerns and
work disruptions. Here is what is happening in his K3 SN: 378
No receive or transmit. I hear no band noise, just a bit of hiss with
the volume turned to max. He was in the middle of a QSO and it just
died. When you transmit, it acts like it is transmitting but there is
no output. The digital readout indicates a frequency and it changes
as you turn the big knob, but the K3 hears nothing and transmits
nothing. If you change bands the rig changes bands and all looks OK
as to frequency readout etc. I hear all the relays clicking, but no
RX or TX anywhere.
I see a 8.23 MHz signal at the RXIF cable on the RF board (J-81)
from the KREF board. It is about 100 mv p to p.
I do not see any signal on the TXIF cable going to the RF board
(J-65) from KREF board.
I checked at Pin 2 on P73 (The synthesizer) for any RF output from
the VCO and I see nothing except some suspicious DC fluctuations that
amounts to a jump of maybe 100 mv. It looks random and not normal. I
should see several volts of RF here I think!
I do see the 49.380 MHz signal in the KREF board. (J1 & J2) That part
is working normally.
This is telling me that I have a synthesizer problem. Are there
things to check on the Synth board? Is there any typical failure
mode that has shown up? Are the boards repaired, or must I buy a new
synthesizer board? This is an original synthesizer board, not a new
design K3S board.
I have been waiting for days to get any tech support response.
Any help would be appreciated.
73
Dave K1WHS
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