[Collins] 75S-3C power transformer

[Dave Brown]

As a result of the problem I have with the mains voltage doing a 'nasty' to
the front panel wafer switch on my 75S-3C rx, I have devised a 'no holes'
work around, details of which I'll cover in a future email.
Meantime, I have been looking at the circuit diagram, in particular, the
mains wiring, and I have a few queries.

 On the circuit diagram, what are the "DA' prefixed designators on the wires
between the mains transformer and 11 pin plug connections all about?   The
upper one is DASJ91 and there's several more below that one for the other
wires.
At first I thought they were only associated with wires from the 11 pin
connector, but the wire from the transformer to the wafer switch has one as
well. I suspect they are some sort of wire code as the 'S' seems to be
associated with screened conductors, but if anyone has details of what these
are all about I'd appreciate it.

Also- TB2-that vertical 'round turret'of tags near the af output
transformer-seems to have letters on it for the various vertical columns of
tags but these don't appear on the circuit diagram-or do they?  It would
certainly be useful if they did.

TB2 terminates (among other things) the mains transformer primary winding
connections, hence my interest.  (This particular receiver has a 230 volt
primary transformer, not a 115 volt one.  It IS a Collins part numbered
transformer- and looks to be 'factory'-any one care to comment?)

I haven't pulled another receiver out of it's cabinet to check as yet, but I
presume the transformer wire colour code will be the same for both 115 and
230 volt variants.
In my case, the transformer wires at TB2 are black for the primary winding
'hot' end connected to the switch and fuse etc, while the neutral end of the
primary winding is a green wire. The wire colours from there on are
different.  If someone can confirm these mains transformer primary winding
wire colours I would appreciate it.
73
 Dave, ZL3FJ