IBM 9348 Service Information page 19

Figure 1-2 (Page 2 of 4). Tape Read Reference Codes
Ref'
Code
I
Part Number
I I
I
or run test 2 to verify the repair
If this reference code continues to occur on good tapes, exchange the
FRU and run test 2 to verify the repair.
Probable
Cause
I
Tape
21 F7923
Action
60%
39
O h
0028
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 on good tapes, exchange the
FRU and run test 2 to verify the repair.
An error that is not known occurred during a read operation. If this
reference code continues to occur, exchange the FRU and run test
2
to
verify the repair.
The error detection circuits detected one track in error 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,
Tape
21 F7923
Tape
21 F7923
21 F7933
A data block timeout 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.
Tape
21 F7923
21 F7933
An error occurred while the tape unit was attempting to detect a block
of data. 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.
- - - -
The tape unit could not detect the end of a block 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
repai r.
A bad interblock gap occurred after the identification (ID) block 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
Chapter 1 . Analyzing Problems
1-7