[1000mp] Failed FP-29 Power Supply

[Harold Mandel]

Dear Rich,

While, if you look at the schematic, the power input for the 12 and 30 volt
lines both have
spike protection in the radio chassis itself, as does the FP-29 circuitry,
static buildup
and subsequent discharge through the internal electronics can wreak havoc in
sensitive
components, and a cascading effect there might very well result in a power
supply
failure as being the primary symptom.

You could rig up a 13.8 volt regulated source and pin out to the connecting
cable's
12 volt pair to see if the radio lights up.

However, and this is a big IF, if the radio internal circuitry has caused
the 
power supply failure, then the damage in the radio could very well be
limited to
a select few components, and jamming 13.8 volts through at this point might
cause defective stuff to physically heat and maybe burn up, which might
damage
other collateral components.

The most prudent choice is to imagine both the radio and power supply are
somehow connected in their dysfunction and to ship the pieces together.

If while on the factory bench a collateral component burns you might never
know about it officially, but if you perform the action and burn something, 
it will be on your shoulders.

Lastly, the radio and its attendant power supply are a combined system,
however
physically separated, but a system nevertheless. You paid thousands of
dollars
for this system and this might not be the time to save pennies....

Respectfully,

Hal Mandel
W4HBM

-----Original Message-----
From: 1000mp-bounces at mailman.qth.net [mailto:1000mp-bounces at mailman.qth.net]
On Behalf Of Richard Thorne
Sent: Thursday, November 30, 2006 1:55 PM
To: 1000mp at mailman.qth.net
Subject: [1000mp] Failed FP-29 Power Supply

I believe I have a bad FP-29 power supply.  I was using my Mark V 200 
watt rig last night, heard a pop that sounded like it came from the 
supply and the rig went off.

When I turn the supply on and off the LED comes on bright but quickly 
dims, and the rig will not turn on.

I put my volt meter across the output of the supply I get zip.

When this happened my rig was connected to the antenna, the wind was 
howling as well as snowing.  Is there any chance I took a hit via the 
antenna that some how took out the supply?

My question is should I send the rig in along with the supply or just 
the supply?  It sure would save on shipping if I did not have to send 
the rig in.

Rich - N5ZC

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