Technical data

5-68 FRU Removal and Replacement
5.5.29 DIO-II Motherboard Removal and Replacement (Model 400s)
To remove the DIO-II motherboard, refer to Figure 5-44 and follow these steps:
1. Remove the top and side covers, CPU board with plate, all DIO-II boards, DIO-
II card cage and center wall, and the right trim plate.
2. Disconnect all cable connectors from the component side of the motherboard.
3. Remove the mass storage cover plate on the left side of the chassis.
4. Remove the lower mass storage mounting screws from the right side of the chas-
sis and pull the mass storage device out four inches.
5. Disconnect the mass storage power distribution and SCSI cable from the back of
the motherboard.
6. Remove the five screws that hold the motherboard to the chassis and to the 3-slot
DIO-II card cage front wall.
7. Remove the motherboard by sliding it to the right so that its mounting pins clear
their holes. Then, pull it out.
Follow these steps to replace the DIO-II motherboard:
1. Position the motherboard by placing it on its mounting pins. Then slide it to the
left so that its tabs fit into their slots in the chassis. Ensure that the LED board
ribbon cable and power switch cables are clear of the motherboard.
2. Install the five motherboard screws to hold the motherboard to the chassis and
the 3-slot DIO-II card cage front wall.
3. Connect the mass storage power distribution and SCSI cable to their connectors
on the back of the motherboard.
4. Reinstall the lower mass storage device.
5. Reinstall the mass storage cover plate.
6. Reconnect all cable connectors to the component side of the motherboard.
7. Replace the remaining assemblies.