[GreenKeys] ST-6 routine maintenance

[Ralph Irish]

And, if there is an occasion to remove any boards with toroids, consider replacing the hex nuts and lock
washers with acorn nuts, or whatever those nuts are called with the plastic or fiber 'snubber' to keep
the nut from working its way off.  With a bolt, lock washer and conventional nut, enough 'oomph' has to
be applied to make things 'snug'.  This might be enough to put extra pressure on some part of the wiring
to cause a future problem.  

Acorn nuts can be adjusted to provide 'holding' at any other tension setting, keeping the toroids in
place and hopefully movement free, while not causing too much pressure from the other hardware in use.

Somewhere around here I have a few dozen cork 'washers' about the same diameter as a toroid, or 
slightly smaller.  I've used them along with plastic 'spacers' and the nut/bolt/flat washer, lock
washer, etc.  All kinds of protection and maintenance reduction ideas abound.

If anyone is not familiar with that style of nut, get back to me and I will photograph a handful of
them on and off of a screw.

Ralph - W8ROI

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On May 30, 2020, at 10:30 AM, Duncan Brown wrote:

> I was checking out something with my ST-6 and found (monitoring the Scope output) that there was no 850 hz shift Space tone (2975Hz). Other shifts were OK.
> 
> I opened up the unit and before starting detailed signal tracing, I thought I should do a visual inspection of the 2-850 detector board. BINGO! As I pulled the board out, I could feel that the two toroids were very loose! The hardware  holding the toroids to the board was very loose, allowing the toroids to move around and break one of the fine toroid wires.
> 
> After tightening the hardware and repairing the broken wire, I checked all the other toroids. None were as loose as the broken one, but they all took a couple of turns of the screwdriver to snug them up.
> 
> So just a work of warning - check your toroid hardware occasionally!
> 
> Have fun,
> 
> Duncan
> K2OEQ
> 
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