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Old 28th June 2012, 11:52 PM   #31
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to check that. you can massure resistance from red to red. and from red to the solder point you think is the centertap solder(there you think you can desolder it). and see if the resistance is half of the resistance from red to red.
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Old 15th October 2012, 09:39 AM   #32
tinitus is offline tinitus  Europe
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I have the same issue now
trying to remove a 120-220-240V mains selector switch
tricky, but with 3 voltages and only 4 wires I reckon it have to be one wire with taps

will try and see what happens if I remove a wire from the switch
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Old 15th October 2012, 09:56 AM   #33
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Quote:
Originally Posted by silver1omo View Post
I just realized that the PCB has markings on the mains.
Blue 0v
Brown 110v
Orange 240v
White 220v
Red 127v

So I'm guessing it is a multi-tap. I'll make a dim bulb tester and see what I get.

Thanks guys.
did you test with the leads disconnected to the board? if that is the case then the primary is easy, just use the blue and the orange wire and you're done...
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Old 15th October 2012, 10:38 AM   #34
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ok, before cutting I measured 450ohm at 240V mains switch
after cutting the blue wire from selector, still measure 450ohm
and 220V is gone from selector
seem fine so far
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Old 15th October 2012, 11:06 AM   #35
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checking secondary voltage, and still 19-0-19V
cutting the red wire, and measure 450ohm on main switch
power on and voltage check
and still measure 19-0-19V
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Old 15th October 2012, 12:48 PM   #36
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good job....
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Old 15th October 2012, 01:23 PM   #37
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thanks
not so easy to find nice small trafos these days
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