Whilst plugs P8 and P9 are still plugged into the motherboard, make the following five DC voltage measurements:

Plug Pins Colour Function Expected voltage measurement
P9 4/5/6
3
Red
White
+5 volts
-5 volts
Expected to be something over + 4.8 volts   (source: IBM manual)
Expected to be something over - 4.5 volts   (source: IBM manual)
P8 4
3
1
Blue
Yellow
Orange
-12 volts
+12 volts
POWER GOOD
Expected to be something over - 10.8 volts   (source: IBM manual)
Expected to be something over + 11.5 volts   (source: IBM manual)
Expected to be something over + 2.4 volts   (source: IBM manual)


  minimum_diag_config.jpg