Problem, will not tune in the tune mode. No bias voltage, no output in the tune mode.
However, in the cw mode it will tune up but not transmit unless the send switch is engaged.
I'm afraid to operate the radio like this in fear of damaging the finals.
Any suggestions on where and what to look for?
TIA - KK5RH
You say no bias voltage. How did you determine that?
Have you checked the rear panel "SG" switch?
SG switch must be in the ON position for normal operation, discussed in the operators manual.
You say CW mode only works when SEND switch is "engaged". Did you turn VOX ON
in CW mode? If not then you need to do that to use "Semi Break-in" which is discussed in
the 520 manual.
If VOX is turned ON but CW still doesn't work by pressing the CW key without SEND switch engaged then the
problem is a failed Q8 relay switch on the VOX Unit board.
73
Mike W5RKL
www.w5rkl.com