CJ18 Pot and switch.

[Ian Taylor 12Participant @iantaylor12]

Connections?

[Ian Taylor 12Participant @iantaylor12]

I have been trying to replace the potentiometer/switch on my CJ81 mini lathe.In the process connecting wires have become detached from the circuit board and I am unable to find the locations. The wires are still attached to the switch terminals on the back of the pot and the 3 terminals of the pot to the board are intact. If anyone can help I'd be most grateful. Failing direct help can anyone provide a contact email address for Steve Jordan who has in the past made a YouTube video of rewiring a potentiometer – unfortunately it did not show the switch connections on the circuit board or other location. Thanks in hope, Ian.

[John RuddParticipant @johnrudd16576]

Ian,

Have a look at ….

https://littlemachineshop.com/info/business_resources.php?ID=1876291636&CAT=1

Without knowing which board you have fitted, its difficult to tell you……

[SillyOldDufferModerator @sillyoldduffer]

Can you post a good photo of the board Ian? It may be possible to work out where the wires go from that. I think from your description it's only the switch wires that have come adrift, not the three speed-control wires connected to the pot?

How to post photos on the forum here.

This circuit pinched from Amadeal's CJ18 Manual may help, assuming your lathe's electronics are as described in it (mini-lathe electronics vary a fair bit, similar rather than identical):

The red square highlights the 3 speed control wires marked P1, P2 & P3 connected to the potentiometer. These connect to board KBIC240. I believe the board should have 3 tag connectors arranged in a triangle (as shown inside red circle).

An oddity is that the reversing switch (marked SH-A) also has a connection marked P3. (inside Orange Circle) I don't understand this; the photo might help.

The switch part of the potentiometer (inside blue box) has three wires, 2 of which ( 'TA' ) are connected together. One of these (doesn't matter which) goes to a terminal on the Reversing Switch; the other goes to a terminal on KZSHUXBOARD as does the third wire 'TG'. TA & TG are highlighted by a blue box.

Amadeal's drawing probably indicates roughly where on the real board the terminals are to be found, and they could also be marked more-or-less sensibly on the board itself. May be terse abbreviations!

Hope that helps.

Dave

Edit: pesky smiley removed

 

 

 

Edited By SillyOldDuffer on 04/03/2019 13:35:01

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