Model 825 - Device Board - Db2, Db3, And Db4; Model 825 - Disk Unit (Concurrent) - IBM iSeries 270 Service Manual

4. Remove the optical and tape units from the cage assembly. See Model 825 - Removable media -
D17 and D18.
5. Remove the screws holding the front of the cage assembly to the front of the system unit frame.
6. Remove the screws from the back inside of the cage assembly.
7. Remove the air flow shield from the left side.
8. Pull the device cage assembly partially out of the system. Label and disconnect all cables from the
back side of the device backplane.
9. Remove the device cage assembly by pulling it forward and out of the system unit frame.
10. To install, reverse this procedure.
This ends the procedure.

Model 825 - Device board - DB2, DB3, and DB4

For use by authorized service providers.
Use this procedure to remove or replace the device board - DB2, DB3, or DB4 on the Model 825.
To remove or replace the device board - DB2, DB3, or DB4:
1. Power off the system. See Power on/off the system and logical partitions.
2. Disconnect all power cords.
3. Remove the front and left side covers. See Model 825 - Covers.
4. Remove the EMC shield.
5. Remove all the disk units from the cage assembly. See Model 825 - Disk unit (dedicated).
6. Remove the screws holding the front of the disk unit cage assembly to the front of the system unit
frame.
7. Remove the screws from the back inside of the cage assembly.
Important: The SCSI cable is located on the left side of the cage assembly.
8. Remove the air flow shield from the left side.
9. Pull the SCSI cable out of the disk unit cage you want to remove.
10. Remove the disk unit cage assembly by pulling it forward and out of the system unit frame.
11. To install, reverse this procedure.
This ends the procedure.

Model 825 - Disk unit (concurrent)

For use by authorized service providers.
Use this procedure to remove or replace the disk unit concurrently in the Model 825.
Attention: If removing the cover while powered on, errors may occur due to electromagnetic interference.
Attention: The disk unit is sensitive to electrostatic discharge. See Work with electrostatic
discharge-sensitive parts.
To remove or replace the disk unit concurrently:
1. Determine if the system has logical partitions. Go to Determine if the system has logical partitions
before continuing with this procedure.
2. Were you directed here from Recovery procedures?
v Yes: After you have determined the location of the disk unit to replace, remove the covers. See
Model 825 - Covers. Then, continue with the next step.
v No: Go to Recovery procedures.
3. Remove the EMC access plate that is over the disk unit that you are removing. For location
information, see Locations and addresses.
Analyze hardware problems
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