IBM 5150  -  Circuit diagram for IBM 63W power supply unit (PSU)

  xxxxxxx WARNING:

Opening the 5150's PSU may expose you to hazardous voltages and currents.
Do not assume that those hazards will disappear shortly after disconnecting the PSU from mains (house) power.
Before opening the power supply, adequately educate yourself as to the hazards.
Hazard examples at here.

Note that in the supply lifetime of the IBM 5150, there were variations of the PSU.  Some known differences follow:
• 120V AC versus 220V AC
• AC powered fan versus DC powered fan

There may be many more differences.

IBM did not provide circuit diagrams of the PSU in the 5150 manuals.  Accordingly, circuit diagrams are hard to come by.

Click on this link for a circuit diagram of a particular variation.