Installing A Dimm; Power Supply; 20-Pin Main Power Supply Connection - IBM 2179 Hardware Maintenance Manual

Installing a DIMM

1. Position the DIMM above the connector so that the two notches on the bottom
2. Firmly push the module straight down into the connector until the retaining

Power Supply

If the power-on indicator is not on, the power-supply fan is not running, or the
computer will not power-off, do the following:
If the above are correct, check the following voltages.

20-pin main power supply connection

See "System board layout" on page 14.
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Hardware Maintenance Manual
Notches
edge of the module align properly with the empty connector.
clips pop up and fit snugly around both ends of the module.
Check/Verify
Check the following for proper installation.
v Power Cord
v On/Off Switch connector
v System Board Power Supply connectors
v microprocessor(s) connection
Check the power cord for proper continuity.
Check the power-on switch for continuity
when pressed.
Attention:
These voltages must be checked with the power supply cables connected to the system
board.
Pin
1
2
3
4
FRU/Action
Reseat
Power Cord
Power-on Switch
Signal
3.3 V
3.3 V
COM
5 V
Function
+3.3 V dc
+3.3 V dc
Ground
+5 V dc