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Another thing is knowing which part is the old one.

I have been known to use used parts. So I got this RPTV needs a HV block.
(thing that distributes the HV to the three CRTs and divides down the
focus and G2 voltages)

The wires go all over the place so it takes a little time to get it out
and in. So I get it out. Then I picked up the same part and put it back
in.

I keep track of the used parts pretty well. This one came from a working
unit that had weak CRTs. Took a little head scratching but it finally
dawned on me that I had reinstalled the bad part.

Now, when I know a part is bad I do something to it. Cut off a wire of
something. Anything to distinguish it.


Done that also. Got to the point I carry a felt tip pen and mark the old
one with a O or OLD on it. May just put an X or sometimes if the old part
is put back in because it was not bad I put number on it.

Some of the computer controlled processes use what is called a PLC that has
lots of modules about the size of the cable modems that plug into a rack.
They will have a few small switches or jumpers inside them and the new one
will need to be set the same as the old one. Need to keep up with which is
the old part and which is the new one so the switches can be set correctly.