The PS-125 power supply comes in two versions, one for 100 -120V mains (The Americas/Japan) and one for 200 - 240V (Europe/Asia). The nameplate on the back panel specifies which version you have. Changing over from one mains voltage setting to the other is simple.
First remove the black covers, revealing the inner aluminium case. There are black screws holding these covers on both sides, and on the top and bottom.
The inner case is made up of two halves, one forming the bottom and one side and the other forming the top and the other side. Look carefully. You want to remove the one that exposes the top of the printed circuit board. Remove the appropriate self-tapping stainless-steel screws to do this. You cannot damage anything if you take off the wrong panel; you will just have a lot more screws to put back.
Refer to Fig. 2. Near one end of the PCB you will see a black jumper wire and two posts, one marked 100V and the other marked 200V. The only difference between the 100 -120V and 200 - 240V units is this jumper. To convert from 120V to 240V mains voltage, simply move the jumper from the 100V to the 200V post, and reassemble the PSU.
Interestingly, after we made this change we found that the PSU would provide its rated voltage regardless of whether it was plugged into 120V or 240V mains. It provided enough current when powered by 120V to drive our IC-756Pro II to 10W RF output. We did not test beyond this; we figured that the jumper must be there for a good reason!
This partial schematic (PDF) shows what you are doing when you perform the change.
View the complete IC-PS125 schematic.
Download the IC-PS125 Service Manual by Lawrence Young K4LXV & Dick Knol PA3DUV.
Download the IC-PS125 User Manual.
Copyright © 2005 M.Nunas VEØMN. All rights reserved.
Page creation, editing and photos except where noted: A.Farson VA7OJ/AB4OJ
Last updated: 09/25/2019.