Storage Device 110 Processor Problem Isolation Procedures; Sdc-Pip3 - IBM Application System/400 Service Information

Storage Device 1/0 Processor
Problem Isolation Procedures
SDC-PIP3
This procedure isolates problems on the interface
between the multiple function I/O processor
(MFIOP) and the storage devices when the
MFIOP is the most probable failing item.
Before performing this procedure, ensure
that the disk address jumpers are installed
correctly (see "Disk Unit Address Jumper
Wire Connections (Type 61 xx Disk Units)"
on page 5-14 and "Disk Unit Address
Jumper Connections (Type 66xx Disk
Units)" on page 5-14).
1
Perform an initial program load (IPL) to
dedicated service tools (DST) by doing the
following:
a. Power off the system if it is powered on
(see "Power off' on page 5-2).
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 a system reference code (SRC)
appear on the control panel?
No Yes
~
Go to step 4 of this procedure.
2
Does the Display Missing Disk Units
display or the Suspend Missing Disk Units
display appear on the console (see "VUC
PIP Display Examples" on page 3-30)?
Note: Use the characters in the column
labeled Type to find the correct reference
code table.
No Yes
~
If all the reference codes are 0000,
go to ''VUC-PIP11'' on page 3-24
and use cause code 0002. If any
of the reference codes are not
0000, go to step 4 of this proce-
dure.
3
Look at all the error logs by selecting the
Error log utility option under DST (see
"System Tools" in the Service Functions
User's Guide).
Is an SRC logged as a result of this I PL?
Yes No
~
The problem cannot be isolated any
more. Use the original SRC and
exchange the parts, starting with
the highest probable cause of
failure (see the failing item list for
this reference code in Chapter 2 of
this guide). If the failing item list
contains FI codes, see "Failing Item
(FI) Code Table" on page 2-55. If
you need help in finding disk unit
part number locations in the
system, see "Disk Unit FRU
Locations" on page 3-7.
This ends the procedure.
4
Record the SRC on the Problem Summary
Form (see Appendix 0, "Problem Summary
Form" on page 0-1).
Is the SRC the same one that sent you to
this procedure?
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.
5
Perform the following:
a. Power off the system.
b. Disconnect the cables to disk unit 1.
c. Perform steps 6 through 11 of this pro-
cedure to determine if disk unit 1 is
failing.
d. If disk unit 1 is not failing, repeat steps
6 through 11 of this procedure for the
remaining disk units and the tape unit.
e. If a device is not isolated as the failing
FRU, reconnect the devices and con-
tinue FRU isolation with step 12 of this
procedure.
6
Power on the system.
Chapter 3. Problem Isolation Procedures
3-11