IBM Application System/400 Service Information page 117

disk unit. This address matches the device
location for disk units.
See "Device Locations and Addresses" on
page 5-15 to find where this device location
number and the associated disk unit are
located on the system.
8
Determine the disk unit type number.
You can determine the part number of the
disk unit by looking at a label located on
the disk unit. You must remove the disk
unit to see this label.
Exchange the following parts:
a. For the type of disk unit you have (see
"Type and Part Number List" on
page 2-62):
• Disk drive and logic card
b. Chassis
This ends the procedure.
9
Perform the following:
a. Look at the Data display characters for
Function 15.
The address of the disk unit is the
second character from the left of Func-
tion 15.
b. Exchange the disk unit (see "Disk Unit"
on page 4-7).
You can determine the part number of
the disk unit by looking at a label
located on the disk unit. You must
remove the disk unit to see this label.
See the "Type and Part Number List" on
page 2-62 to determine the part numbers
of the following:
• Disk drive and logic card
This ends the procedure.
10
Perform the following:
a. Look at the Data display characters for
Function 15.
The address of the disk unit is the
second character from the left of Func-
tion 15. This address matches the
device location number for the disk unit.
b. Perform the procedure "Restoring Data
to the Disk Unif' on page 5-13.
Note: If an error is indicated, perform
problem isolation from the start.
This ends the procedure.
11
Perform the following:
a. Select IPL type A, mode M (see
"Selecting IPL and Mode" on page 5-2)
and perform an IPL. The Display
Missing Disk Units display or the
Display Load-Source Failure display
appears.
b. Press Enter on the control panel.
c. Enter the DST password,
22222222.
d. Select the Work with disk units option.
e. Select the Display disk configuration
option.
f. Select the Display configuration status
option.
g. Find the two disk units displayed as
Unit 1 on the Display Configuration
Status display.
h. Swap these two disk units with each
other and perform an IPL.
If the problem is corrected, this ends the
procedure.
If a different reference code appears, use it
to correct the problem. If the same refer-
ence code appears, reinstall the disk units
in their original locations and go to step 6 of
this procedure.
12
Ask your next level of support for assist-
ance and report a Licensed Internal Code
problem.
This ends the procedure.
13
The system has detected missing disk units
due to the wrong internal format.
Perform an IPL by doing the following:
a. Select IPL type A, mode M (see
"Selecting IPL and Mode" on page 5-2)
and perform an IPL (see "Initial
Program Load (IPL) Summary" in the
Chapter 3. Problem Isolation Procedures
3-27