Mike,
It is hard to say where the problem may be, but it may turn out to be an
unsoldered or poorly soldered connection that has now formed enough
oxidation to cause trouble. The fault could be anywhere in the receive
portion of the K1.
One way to troubleshoot is the turn to the Troubleshooting section of
the manual, build the oscillator and RF Probe that is depicted in the
schematics and follow the troubleshooting procedures in the Receive
Signal Tracing section.
Without further information, all I can say is that the problem is
'somewhere in the receive path'.
Since it was working before, you should assume a single failure. Keep
that in mind as you do further troubleshooting that DC voltage
measurements can have a variation of +/- 10% from the listed values -
greater than 10% may indicate an area to be investigated. Check the RF
voltage levels at the mixer and product detector pin 6 - the NE612 needs
at least 70 mV RMS of signal to operate efficiently.
One can guess at the possible causes (there are many), but signal
tracing is the quickest way to the proper answer.
73,
Don W3FPR
Michael - VE3MKX wrote:
Hi, I have a K1 #744, a four bander with the built in Auto tuner.
The rig worked great. I haven't used it in a couple months, I went
the other day to use it... It is now deaf. I hear strong signals,
but compared to my FT-817 running side by side, the K1 is missing a
ton of signals. The tuner appears to be working fine.
Any thoughts on how to rectify the problem or where to start trouble
shooting?
73 Mike
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