IBM 270, Service Manual

Page: 211 / 622

To remove or replace the power supply P01 and P02:
1. Are there two power supplies and four running AMDs installed in the expansion unit?
v
Yes: Continue with the next step.
v
No: Perform the following:
a. Power down the expansion unit. See Power on/off the system and logical partitions.
b. Remove the power cord from the rear of the expansion unit, and continue with the next step.
2. Remove the power cord from the power supply you are going to remove.
3. Remove the right or top side cover, depending on expansion unit orientation. See FC 5095, FC 0595 -
Covers.
4. Pull the latch handles sideways on the power supply you are removing. If two power supplies are
being used, do not remove both at the same time.
5. Pull the power supply from the expansion unit.
6. Install the power supply by reversing this procedure. After exchanging an item, go to Verify the repair.
This ends the procedure.
FC 5095, FC 0595 - Tower card - CB1
For use by authorized service providers.
Use this procedure in conjunction with the Expansion unit power procedure to remove or replace the tower
card - CB1 in an FC 5095 or FC 0595.
To remove or replace the tower card - CB1:
1. Power off the expansion tower. See the Expansion unit power procedure.
2. Remove the ac power cord from the expansion unit that you are working on.
3. Remove the side cover. See FC 5095, FC 0595 - Covers.
4. Remove the PCI card access cover.
5. Remove the PCI cards and the card dividers. See FC 5095, FC 0595 - Cards (dedicated).
6. Remove the power supplies.
7. Remove the PCI card support brackets (headstock), and the power supply bracket. See Figure 2 in
Final assembly — FC 5095 Expansion I/O Tower.
8. Disconnect the HSL cable from the backplane. And then, remove the power supplies from the
backplane.
9. Remove the five screws (three from the side and two from the back) that hold the backplane to the
expansion unit. Notice the aligning pins near the top of the board, and the power connections near
the bottom of the board, for when you reinstall the board.
10. Install the backplane by reversing the above procedure.
11. Perform steps 23 (See page 569) and 24 (See page 570) in the Expansion unit power procedure.
Then, return here and continue with the next step.
12. Set the configuration ID in the SPCN component:
a. If the ac power is not applied, then apply it now.
Note: The tower may power up automatically.
b. Power off the expansion unit without removing the power cord using the Expansion unit power
procedure. Then, return here and continue with step 12c.
c. Select function 07 on the system panel and press Enter (07** will be displayed).
d. Use the arrow keys to increment/decrement to sub-function A9 (07A9 will be displayed). Press
Enter (07A9 00 will be displayed).
e. Use the arrow keys to increment/decrement to the expansion unit address, usually 02, 03, and so
on for an FC 5095, FC 0595 (07nn will be displayed, where nn is the expansion unit address.
Press Enter (07nn 00 will be displayed).
Analyze hardware problems
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