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Replacement
1. Grasp the bottom of the I/O module with both hands and slowly slide it into the CPU
enclosure until the nut on the I/O module touches the tip of the docking screw on the
CPU module.
Note: The I/O module should easily slide into the CPU enclosure until it touches the
docking screw. When this occurs, the bottom rear edge of the I/O module should be
approximately 9mm outside the bottom rear edge of the CPU enclosure.
2. Turn the docking screw just until the I/O module is pulled far enough into the enclosure
to install the two retaining screws.
3. Install the two retaining screws but do not tighten them.
4. Tighten the docking screw.
5. Tighten the two retaining screws.
6. Guide the SCSI–2 cable in the I/O module and through the opening for the system
interface board.
7. Connect the SCSI-2 cable connector to the SCSI-2 adapter.
8. Do the "System Interface Board" replacement procedure on page 4-65.
9. Install the cooling unit and the power supply. Refer to the "Power Supply or Cooling Unit"
replacement procedure on page 4-61 for information about replacing the cooling unit and
the power supply.
10.Do the "Adapter Cable" replacement procedure on page 4-73.
11. Depending on the power distribution in your rack, do one of the following Power-On
procedures:
"Power-On Procedure with a Power Distribution Bus" on page 4-4
"Power-On Procedure with a Power Distribution Unit" on page 4-7
"Power-On Procedure with a Power Distribution Panel" on page 4-11.
4-70
Service Guide
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