I got a close up of the pump input area and marked up what I think is on the board: http://wallacecompany.com/machine_shop/G540/G540_upper_bottom_z-1b.png
So, I think C is the capacitor coupler. Then the signal drives one SMT diode and across another (filter?) capacitor and the opto-c LED with limit resistor. Searching KL4 got this as a possible component: http://www.datasheets.org.uk/indexdl/Datasheet-093/DSA0063378.pdf -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ For Developers, A Lot Can Happen In A Second. Boundary is the first to Know...and Tell You. Monitor Your Applications in Ultra-Fine Resolution. Try it FREE! http://p.sf.net/sfu/Boundary-d2dvs2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
