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Re: Switch won't latch - 7CT1N

 

Rolynn:

Thanks for the tip- I have a 7633 scope with a similar problem (several
of the push-on/push-off switches are mechanically
uncooperative/unpredictable/cranky), and while I haven't checked to see
if the part numbers of the switches are the same as those on a 7CT1N, I
suspect that it's a similar failure mode.? Can you clarify what is "CRC
556"?? I have checked the CRC website and I don't see (maybe I am
missing it) a "556" product; can you provide a full identification for
it?? Is is an electrical product, or a lubrication product?? Doing a
"search" at the CRC website on the string "556" produces only a
"food-grade" gear oil that is available in 55 gallon drums, which is
more than I would need.

Mike Dinolfo N4MWP

On 3/20/19 9:49 PM, ROLYNN PRECHTL K7DFW wrote:
I have a minor 7CT1N problem. The NPN/PNP switch won't latch in the in/PNP position, except by some careful jiggling about 3/16" of the way in.
======================================================

With the front panel up, squirt a very small controlled amount of CRC 556 in the space between the square knob and the front panel. Work it in with a few cycles of the switch. Or, on the push-push switches that you can get to from behind the panel, a small controlled squirt on the switch shaft will produce the same results. This is easy on the 7CT1N but not so much on a 576 for example.

Wipe off the excess on the front panel.

Have used this method for 60 years and have yet to see a failure.

Rolynn
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