Both red leads are 5V so don't worry about getting them mixed up.

To adjust the output voltage there is a trim pot on the PSU - from memory I think this is visible in photo's in the Wiki but I can't check as it's still down. Anyway, turn this whilst measuring the output voltage using a multimeter. Take care to follow the full instructions in the Wiki - Jeje wrote these in consultation with me after I guided him through his own PSU replacement. Main thing is take care - you are working with live voltages - if you are not confident then don't do it.

I must admit I have always been puzzled as to whether the adjustment from 5.0V to 5.2V is strictly necessary - the early type PSUs were not adjustable and were set to 5.0V. It may well be that 5.2v is the optimal voltage but I don't think it's critical.

Cheers, Roger.

Main: 861v8+ID41, 218, HD621, DSP8000SE u, DSP7200SE u, DSP7200HCSE u, Oppo BDP103D, LG OLED557BV.
Second: 218, DSP3200, DSW.
Other Rooms: 1) F80 + MS200. 2) F80 + MS200, 3) F80 + R Pi. 4) F80 + R Pi, 5) F80 + R Pi
Vintage: 207 CD Pro, Lecson AC1 + FM1 + AP3 MkII, Quad ESL 57s