Roger,
Watch temprature changes........ ( cubical dilation ) heat produced by
instant high current.
probably a broken part who reacts on chocs or temperature. Watch very
carefully printed circuit lanes if there are any.
In amateur service dont give up, its rich of experience.
If it is commercial service, throw it away and buy a new one. It may take a
bunch of time to get the default out of it
So if you consider time is money.............you must make a choise . Take
the TIME or take the Money.
Here we use to say, " beautifull women and lots of money, they both take
off..........
Good luck Jos
----- Original Message -----
From: "Roger" <rmurad@superig.com.br>
To: "TowerTalk" <towertalk@contesting.com>
Sent: Tuesday, November 05, 2002 4:30 AM
Subject: [Towertalk] HAM IV strange defect
> My HAM IV rotator has a strange failure.
> One night I turned on the control box and tried to turn the beam (a single
> Force 12 C-3, nothing more). It did not turn (the needle did not move and
> the antenna really did not move too). I tried to rotate to the other
> direction. No operation. I gave up. A month later, without touching
> anything, it worked again. It kept OK for, say, two months. On a given
> night it stoped working again. One week later it came back to life. Then
> after a month it stoped working again. This cycle repeated several times.
>
> When I had the chance, during a "stop", I took it from the tower.
> Before disassembling it, I connected it (in my garage) to the control box
> using a short piece of cable. It worked perfectly... I left everything
> assembled in the garage and some days later I tested it again. The rotor
> did not turn. I disassembled it, but I did not find any signs of damage.
> Even the break wedge seems to work perfectly. In resume, the rotor simply
> keeps this strange behaviour but, inside it, every piece seems brand new.
>
> Has anybody already experienced this kind of failure? Assuming that the
> cable is not the problem, may I suspect of a problem in the control box?
> What components should I investigate?
>
> Your advice will be much appreciated.
> 73 de Roger, PY1OL
>
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