Power Supply - IBM 3746-900 Installation And Maintenance Manual
Service processor (based on 6578)
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Also See for 3746-900:
- Installation manual (276 pages) ,
- Connection and integration manual (166 pages) ,
- Installation instructions manual (10 pages)
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Power Supply
If the power-on indicator is not on, if the power supply fan is not running, or the
computer will not power on, check for the following conditions.
If the above are correct, check the following voltages (see "20-Pin Main Power
Supply Connection").
20-Pin Main Power Supply Connection
See "System Board Layout" on page H-5 for connector location.
Note: These voltages must be checked with the power supply cables connected to
the system board.
11
3-20
3745-XXA 3-20 3746-9X0: 6578 SPIM
Check/Verify
1. Verify that the voltage-selector switch is
set for the correct voltage.
2. Check the following items for proper
installation:
Power cord
On/Off switch connector
On/Off switch power supply connector
System board power supply
connectors
Microprocessrs connection
Check the power cord for proper
continuity.
Check the power-on switch for continuity.
1
10
20
Pin
Signal
1
3.3 V
2
3.3 V
3
COM
4
5 V
5
COM
6
5 V
7
COM
8
POK
9
5 V SB
10
12 V
11
3.3 V
12
-12 V
13
COM
FRU/Action
Correct the voltage-selector switch
setting.
Reseat.
Power cord
Power-on switch
Function
+3.3 V dc
+3.3 V dc
Ground
+5 V dc
Ground
+5 V dc
Ground
Power Good
Standby Voltage
+12 V dc
+3.3 V dc
-12 V dc
Ground
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