g. Depress the push button for 3-4 seconds.
13.
After exchanging an item, go to Verify the repair.
This ends the procedure.
Model 820 - Covers
For use by authorized service providers.
Use this procedure to remove or replace covers on the Model 820.
Attention: If removing the cover while powered on, errors may occur due to Electromagnetic Interference.
To remove the left, right, or top cover:
1. Remove the screws that fasten the cover to the back of the system frame.
2. Push the cover toward the back of the system to remove it.
To remove the front cover: Pull the top of the cover away from the frame.
To remove the back cover: Lift the cover up to remove it.
Model 820 - Device board - DB1 and DB2
For use by authorized service providers.
Use this procedure to remove or replace the device board - DB1 and DB2 in the Model 820.
To remove or replace a device board (DB1 and DB2):
1. Power off the system. (See “Power on/off the system and logical partitions” on page 561.)
2. Unplug the power cord from the back of the system unit.
3. Remove the front and right side covers. (See “Model 820 - Covers.”)
4. Remove the EMC shield in front of the disk units by pulling out on the side two latches.
5. Remove the disk units from the disk unit cage. Label the position of each disk unit.
6. Remove the screws holding the disk unit cage to the frame. The screws are located on the front and
inside rear of the disk unit cage.
7. Unplug and remove the cables on the back of the device board.
8. Pull the disk unit cage out of the frame.
9. Remove the device board from the back of the disk unit cage.
This ends the procedure.
Model 820 - Disk unit (concurrent)
For use by authorized service providers.
Use this procedure to remove or replace the disk unit (concurrently) in the Model 820.
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” on page 585).
To remove or replace the disk unit (concurrent):
1. Determine if the system has logical partitions. Go to “Determine if the system has logical partitions” on
page 579 before continuing with this procedure.
2. Were you directed here from the Recovery procedures topic?
v No: Go to “Recovery procedures” on page 539.
Analyze hardware problems 21
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