Hello imhififan, 

Thank for your reply, It is 100v setting and right color.  Below picture is more clear. 

Thank a lot.

Thanks @frankhhh for posting the pictures of E-260 and E-270.

If I understand you correctly, E-260 and E-270 primary winding color as follow:

winding on E-260 / E-270

1. 120V orange / yellow

2. 100V red / orange

3. 0V gray / red

4. 120V yellow / brown

5. 100V brown / black

6. 0V white / gray

7. T. fuse violet / blue

If above color code is correct, the voltage settings of E-270 should be as below ( pin numbered from left to right according to provided picture ):

120V setting : pin1 = None, pin2 = orange, pin3 = yellow + brown, pin4 = black, pin5 = blue, pin6 = red + gray

220V setting : pin1 = black, pin2 = yellow, pin3 = orange, pin4 = red + brown, pin5 = blue, pin6 = gray

230/240V setting : pin1 = black, pin2 = orange, pin3 = yellow, pin4 = red + brown, pin5 = blue, pin6 = gray

Hello imhififan, 

Yes, I think the color mapping should be as detailed as you describe

Then I jump to 120v setting and it can work. The output voltage become about 49v(maybe my AC input is only 115v)

Thanks for your great help.😄

I'm glad everything worked out fine.

🥂

@frankhhh

As I mentioned, confirm which wire belongs to which primary winding by a DMM!

If convert 100V to 220V or 230/240V, you need to 100% sure the resistance between gray wire and blue wire is 0 ohm, use a ohm meter to measure before connect the gray wire to pin6.