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Electronics gurus... please help

F

floccus

Senior member
Ok, here's the background, I'm working on refurbishing an old ('75) SEM at my University. One of the switches on the unit is missing and so I have to replace it. The problem is, I'm having a rather hard time trying to deciper from the schematics what kind of switch I need and how to wire it. Granted, I'm a microbiology major, but two physics professors couldn't decipher the schematics much either (they actually got into an argument over it which I thought was completely weird and pointless). Anyway...

The switch is the Operation switch noted on this schemtic and we're having a problem deciphering what the dashed lines mean. The yellow lines represent two yellow wires that I've traced, but there are also two blue wires that I've traced to Y2 and Y3, both of which are relays. If anyone can give any input I would be most appreciative.

Oh, and sorry the file is so freakin big.
 
the dashed lines? they mean those switches are part of the relay ie they are turned on/off by the coils.

or are you talking about something else?
 
physics professors might as well have been microbiologists 🙂 Take it to the Computer Science/Engineering college lab area. If you have a VLSI lab that may be a good spot.
 
When the 'operation' switch is closed, it energizes the relay connected to 13,14. This relay is a contactor, which operates the mains for the Microscope. It should be a good sized relay to bring the power in. The dashed lines just mean that the switch operates the contactor. There is a secondary dashed line that looks like it comes from a circle symbol. Edit: the circle symbol looks like an indicator lamp (the PDF is hard to read). In that case, the dashed line just means that it indicates when the switch is actuated. HTH.
 
i tried taking a look at it but for some reason the pdf would not load properly..take it to the electrical/electronics engineering department they will know
 
Just did a quick google of the switch part # MSLN206N. Looks like it is made by ALCO, which is now part of tyco. You can search under alcoswitch as well. In any case, since it is an old part number, I would recommend calling tyco and finding out what the cross reference is.


edit: goto here

they have 18 on hand. Type in msln206n in the search box and you will see it.
 
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