IBM 9348 Service Information page 18

Figure 1-2 (Page 1 of 4). Tape Read Reference Codes
1-6
9348 Service Information
Ref.
Code
0020
002 1
0022
0023
0024
0025
0026
0027
Part Number
21 F7926
21 F7923
Tape
21 F7923
21 F7933
Tape
21 F7933
21 F7923
Tape
21 F7923
21 F7933
Tape
21 F7923
21 F7933
Tape
21 F7923
21 F7933
Probable
Cause
60 %
39
%
60 %
25%
14%
85%
9%
5%
60 %
25%
14%
60 %
25%
14%
60 %
25%
1 4 '10
Action
The buffer is receiving data quicker than it can process it. Exchange
the FRUs as needed. Run test 2 after each FRU is exchanged to verify
the repair.
A gap was detected before the end of data during a read operation.
This problem may be caused by a bad tape or a dirty tape path. Clean
the tape path; see "Cleaning Procedure" on page 4-3. Load a tape
that is known to be good and attempt the operation again, or run test 2
to verify the repair.
If this reference code continues to occur, exchange the FRUs as
needed, and run test 2 after each FRU is exchanged to verify the
repair.
Three or more (0022), two (0023), or one (0024) tracks were in error
during a read operation. This problem is most likely caused by a bad
tape or a dirty tape path. Clean the tape path; see "Cleaning
Procedure" on page 4-3. Load a tape that is known to be good and
attempt the operation again, or run test 2 to verify the repair. Run test
99 to check the read thresholds.
If this reference code continues to occur, clean the head again and run
the diagnostics again. If you continue to get one of these reference
codes, exchange the FRUs as needed, and run test 2 after each FRU is
exchanged to verify the repair.
A cyclical redundancy check (CRC) error occurred during a read oper-
ation. This problem may be caused by a bad tape or a dirty tape path.
Clean the tape path; see "Cleaning Procedure" on page 4-3. Load a
tape that is known to be good and attempt the operation again, or run
test 2 to verify the repair.
If this reference code continues to occur, exchange the FRUs as
needed, and run test 2 after each FRU is exchanged to verify the
repair.
An auxiliary cyclical redundancy check (ACRC) error occurred during
a read operation. This problem may be caused by a bad tape or a
dirty tape path. Clean the tape path; see "Cleaning Procedure" on
page 4-3. Load a tape that is known to be good and attempt the oper-
ation again, or run test 2 to verify the repair.
If this reference code continues to occur, exchange the FRUs as
needed, and run test 2 after each FRU is exchanged to verify the
repair.
An irrecoverable error occurred during a read operation. This
problem may be caused by a bad tape or a dirty tape path. Clean the
tape path; see "Cleaning Procedure" on page 4-3. Load a tape that is
known to be good and attempt the operation again, or run test 2 to
verify the repair.
If this reference code continues to occur, exchange the FRUs as
needed, and run test 2 after each FRU is exchanged to verify the
repair.