IBM Application System/400 Service Information page 103

b. Select IPL Type A and Mode M (see
"Selecting IPL and Mode" on
page 5-2).
c. Power on the system (see "Power on"
on page 5-2).
Does reference code 914x B981 appear on
the control panel?
Yes No
~
If no reference code occurs, the
problem may be intermittent.
If a different reference code occurs,
use it to correct the problem (see
Chapter 2, "Unit Reference Codes"
on page 2-1).
This ends the procedure.
2
Perform the following:
a. Power off the system.
b. Disconnect the SCSI bus cable from all
devices (do not disconnect the SCSI
bus cable from the MFIOP).
c. Power on the system.
Does reference code 914x B981 appear on
the control panel?
No Yes
~ Exchange the FRUs in the failing
item list for the SRC that sent you
to this procedure, starting with the
highest probable cause of failure,
but do not exchange F101107 (see
the failing item list for this reference
code in the "Unit Reference Code
Tables" on page 2-3 and
Chapter 4, "Removal Procedures"
on page 4-1).
This ends the procedure.
3
Does reference code B1xx 1802 appear on
the control panel?
Yes No
Go to Chapter 2, "Unit Reference
Codes" on page 2-1. Use the new
SRC to correct the problem.
This ends the procedure.
4
Perform the following:
a. Power off the system.
b. Reconnect the SCSI bus cable to disk
unit 1 (the load-source).
c. Power on the system.
Does reference code 914x B981 appear on
the control panel?
No Yes
Exchange the FRUs in the failing
item list for the SRC that sent you
to this procedure, starting with the
highest probable cause of failure
(see the failing item list for this ref-
erence code in the "Unit Reference
Code Tables" on page 2-3 and
Chapter 4, "Removal Procedures"
on page 4-1).
Note: When you exchange the
parts listed in FI011 07, exchange
only the parts for disk unit 1. Disk
unit 1 is the only device you recon-
nected the SCSI bus cable to.
This ends the procedure.
5
Perform the following:
a. Power off the system.
b. Reconnect the SCSI bus cable to the
next device.
c. Power on the system.
Does reference code 914x B981 appear on
the control panel?
No Yes
~
The last device to which you con-
nected the SCSI bus cable to is the
most probable failing item. If
exchanging the last device does not
correct the problem, the chassis is
the next most probable failing item.
If exchanging the chassis does not
correct the problem, one of the
devices to which you previously
connected the SCSI bus cable is
the next most probable failing item
(see Chapter 4, "Removal
Procedures" on page 4-1).
This ends the procedure.
6
Have you reconnected the SCSI bus cable
to all the devices?
Chapter 3. Problem Isolation Procedures
3-13