IBM System/36 Maintenance Information Manual page 17

Procedure 121
Perform the action for the symptom that best describes the type of failure.
Symptom
Intermittent disk errors.
Note: A disk utility (diskette 60), IBM
part 6374373, is available to
analyze intermittent disk
problems.
Cannot perform an IPL from disk.
An SRC indicates that the disk drive is
defective.
Action
1. Analyze ERAP for disk SRCs. If an SRC is present,
perform the procedure indicated by the SRC. Use
procedure "803 Analyzing Disk Drive ERAP" on
page 8-3 for more information on analyzing disk drive
ERAP. If this does not solve the problem continue with
step 2.
2. Power off the 5363 System Unit.
3. Remove the 5363 System Unit cover ("305 Cover
Removal" on page 3-2).
4. Reseat the cards and cables in the 5363 System Unit, go to
"220 Board Locations" on page 2-8.
5. Reinstall the 5363 System Unit cover.
6. Power on the 5363 System Unit.
7. Perform an IPL of the 5363 from disk, select function 1,
enter 0000.
If an SRC is displayed, perform the procedure that
matches the SRC.
Note: If the FRU indicated is a disk drive, perform the
Disk Drive Reload procedure on this page.
Run SYSTEST for 10 minutes to verify the problem is
fixed ("328 Service Procedures under SSP" on page 3-10)
and ("360 Getting ERAP Reports" on page 3-24).
Before performing a disk drive reload, go to "804 Disk Drive
Isolation Procedure" on page 8-4, then perform the Disk
Drive Reload procedure to verify that the failure is not caused
by bad data on the 5363 disk drive.
If the Disk Drive Reload procedure does not solve the
problem, perform the procedure that matches the SRC.
Run SYSTEST for 10 minutes to verify any exchanged FRU ("328 Service Procedures under SSP" on
page 3-10).
Disk Drive Reload
This procedure is used to determine if the disk drive A failure is caused by bad system microcode, bad SSP
code, or bad data.
1. Reload the system microcode to disk drive A and perform an IPL from disk. See the following:
a. "312 Performing a System Reset" on page 3-6.
b. "321 Auto Configuring the System" on page 3-7.
Section
1.
System Entry and FRU Isolation Procedures
1-5