I use google for finding a diagram and I found it then shared to you.😉
Anyway my PX-730 can apply this diagram and repair in power pcb.Unfortunately my midi pcb was defect and useless to repair.
Here you are for diagram M900-PSA1
hope helpful
http://dl.docslide.com.br/download/f9a1256a1b5435462fd18d576a2930969f1dfed1e29b3381382eb4b4e95174f050ece09d9915c2db943ba574151cde57ead1b98e372a0dd28af922110c796c0aVtMj3oGBB2M9iq51oZE04JbYvFCVe7Lq0VrBM8ZdaYU%3D