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20-pin main power supply connection
See “System board layout” on page 77 for connector
location.
Attention
These voltages must be checked with the power
supply cables connected to the system board.
1
10
11
20
Pin Signal Function
1 3.3 V +3.3 V dc
2 3.3 V +3.3 V dc
3 COM Ground
4 5 V +5 V dc
5 COM Ground
6 5 V +5 V dc
7 COM Ground
8 POK Power Good
9 5VSB Standby Voltage
10 12 V +12 V dc
11 3.3 V +3.3 V dc
12 -12 V -12 V dc
13 COM Ground
14 PS-ON DC Remote Enable
15 COM Ground
16 COM Ground
17 COM Ground
18 -5 V -5 V dc
19 5 V +5 V dc
20 5 V +5 V dc
If the voltages are not correct, and the power cord is good,
replace the power supply.
30 IBM PC 300/IntelliStation Vol 3 HMM