Hi Mike!
Got the covers off, unsoldered the red wire going from the final amp
section to the power input board and it powers up fine and I hear static
in the speaker. :) Seems to operate normally - can switch filters, etc...
I think you've hit the nail on the head! Something is amiss in the
driver / final section.
Interestingly, measuring from the disconnected red wire to ground and to
the negative power supply input shows high resistance. Not sure what to
make of that. The thought that maybe the finals are okay and the driver
is shorted (only shorting the finals when power is applied) did occur to
me, but without a schematic I'm just guessing.
Anyone have a schematic, service manual, or parts list for a Paragon?
thanks much and 73,
ben
kd5byb
On 7/13/2012 8:56 PM, Mike Bryce wrote:
Something that is pulling a supply into current limiting has to be
nasty.
Pop the covers. There is a heavy read wire that feeds Dc to the
final. Remove that wire (may need to trace it back ) and apply
power.
Sounds like a shorted driver/final
Mike wb8vge
Sent from my iPhone
On Jul 13, 2012, at 9:56 PM, Ben Hall <kd5byb@kd5byb.net> wrote:
Hi Phil!
Thanks for the reply. Warmed up the scope and the AC ripple on
the power supply is less than 75mV peak to peak.
I got out a 10amp, 13.8VDC supply and tried it. It seems like it
tries to come on, all the LED's light, a relay clicks, then the
power supply goes into current limit, everything shuts off. The
power supply will recover, put out voltage again, all the LED's
light etc., power supply goes into limiting and does it again and
again... :(
(I didn't let it do it more than three or four times before turning
it off)
So I'm thinking that power supply is okay and the trouble is
indeed inside the radio. :(
thanks much and 73, ben, kd5byb
On 7/13/2012 7:59 PM, Phil Chambley, Sr. wrote:
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