[TowerTalk] Ham IV Sticking Solenoid problem

[Fred Roberts]

Steve-

It sounds like power is continuously applied to the solenoid else why
would it buzz when it shouldn't.  A quick check would be to see if it
unlatches when power is disconnected.

Just a thought.

Fred, W6TKV

Steve Gilbert wrote:
> 
> After refurbishing my Ham IV rotator with a new potentiomer and new ball
> bearings, (the old ones had gone black as damp had gone into the casing), the
> one problem that remains is the fact that the brake solenoid and armature seem
> to have become magnetized, so that when the brake is released and there is no
> current, the armature does not release. I tightened up the return springs, but
> this made no difference. The only way around this seems to be to place a thin
> non-magnetic layer, like a layer of PVC tape across the pole piece of the
> solenoid, so that the magnetic circuit is broken. The armature then goes back
> every time, BUT the solenoid tends to buzz !!! Any great ideas???..Steve, G3OAG
> 
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