Drive Connector 1
If any of the voltages are not correct, replace the power
supply.
If all voltages are correct, the power supply is working
properly. Another 3550 Expansion Unit component might
be causing the power supply to shut off. Return to the
procedure that sent you here and continue. (If you have
completed that procedure, go to “Undetermined Problem”
on page 333.)
Power Supply Connector P1
1
10
Power Supply Connector P2
1
8
Pin Signal V dc Min. V dc Max.
1 +12 volts +11.52 +12.6
2, 3 Ground
4 +5 volts +4.8 +5.25
Pin Signal V dc Min. V dc Max.
1, 2, 3, 4 +5 volts +4.8 +5.25
5, 6, 7, 8,
10 Ground
9 +20 volts +19.0 +21.0
Pin Signal V dc Min. V dc Max.
1, 2 +12 volts +11.52 +12.6
3
Power
Good +4.0 +5.25
4
On/Off
Signal
5 −12 volts −10.92 −13.2
6, 7 Ground
8
Global
Signal
328 IBM Mobile Systems HMM - Volume 1
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