1-5. Tape Unit Controller Reference Codes - IBM 9348 Service Information

Figure 1-5. Tape Unit Controller Reference Codes
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The encoder failed to detect the size of the tape reel. Run test 89. If
test 89 fails, check the supply hub flags; see "Motors and Hubs
Removal" on page 3-78. If the flags are damaged, exchange the
supply hub.
If the supply hub is good and test 89 continues to fail, exchange the
remaining FRUs as needed, and run test 89 after each FRU is
exchanged to verify the repair.
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I
Part Number
Tape
21 F7930
21 F7945
21 F7927
The tape cannot pass through the tape path. This problem may be
caused by a damaged tape leader. Crimp the tape leader. The 9348
Customer Information manual contains more information on preparing
the tape. When the tape is correctly crimped, observe the tape loading
through the top cover.
If the tape passes into the tape path correctly and the reference code
continues to occur, run test 89. If test 89 fails, exchange FRU 21 F7930
and run test 89 to verify the repair. If test 89 did not fail and the refer-
ence code continues to occur, exchange 21 F7945. Do a load-tape
operation to verify the repair.
Probable
Cause
An open loop motor control error has occurred. Run tests 91 and 92
and observe the supply hub clamp locking and unlocking operation. If
the supply hub does not work correctly, exchange FRU 56F0022 and
run tests 91 and 92 to verify the repair.
If the supply hub worked correctly and the reference code continues to
occur, run test 95 to isolate the remaining FRUs. If test 95 fails,
exchange the remaining FRUs as needed, and run test 95 after each
FRU is exchanged to verify the repair.
Action
A gap timer circuit error has occurred. Run test 2 to isolate the FRUs.
If test 2 fails, exchange the FRUs as needed, and run test 2 after each
FRU is exchanged to verify the repair.
1-18
9348
Service Information