7.
Start a type D IPL from the system unit control panel.
8.
Does the IPL complete successfully?
No
Yes
↓
The problem has been corrected.
This ends the procedure.
9.
Obtain another copy of the tape. Repeat steps 6 and 7 using the new tape. If
this does not correct the problem, continue with step 10.
10.
Look at the 4 rightmost characters of the Data display for word 1. These 4
characters are the unit reference code.
11.
If the 3590 indicator panel shows a FRU identifier (FID) code, see the “Start”
section of the 3590 service information.
12.
See “SRC Address Formats” on page 936 to determine the IOP, IOA, and
device address.
13.
Find the unit reference code in the following table.
14.
See the “Start” section of the 3590 service information.
Notes:
1.
If the failing item is a failing item (FI) code, go to “Failing Items” on page 479
to determine which part number associated with the FI code is failing.
2.
If the failing item is a type number, go to “Type, Model, and Part Number list”
on page 885 to determine the part number.
3.
If the failing item is a symbolic FRU, go to “Symbolic FRUs” on page 495 to
determine the part number.
Reference Code
Description/Action Perform all actions before exchanging Failing Items
Failing Item
9020
I/O processor detected a SCSI bus configuration error
Before exchanging any parts, verify that the following conditions are
not
present:
v
Tape and DASD devices attached to an I/O processor that does not
support tape and DASD devices at the same time.
v
A device type or model that is not given support
UHQCNFG
FI00851
FI00130
9100
Interface error detected by I/O processor or by tape unit
Before exchanging any parts, do the following:
1.
Ensure that an interposer is connected between the I/O processor and
the SCSI cable.
2.
Ensure that the SCSI cable between the interposer and the device is
seated correctly, and that there are no bent or damaged pins on the
SCSI cable.
3.
Ensure that a terminating plug is attached to the device end of the SCSI
cable.
FI00851
FI00131
05H3834
EXTSCSI
61G8324
3590
Chapter 2. Unit Reference Codes
147
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