IBM 9348 Service Information page 34

Figure 1-8 (Page 1 of 3). 3xx Tape Unit Controller Diagnostic Reference Codes
A read-only storage test error has occurred. This reference code can
occur i f the program modules were moved and a module pin has been
bent. Ensure that any modules that were moved are correct. Run test
41.
If this reference code continues to occur, exchange the FRUs as
needed, and run test 41 after each FRU is exchanged to verify the
repair.
1
Part Number
Code
A direct-access storage test error has occurred. Run test 50. If this
reference code continues to occur, exchange the FRUs as needed, but
power the tape unit off and then on again after each FRU is exchanged.
This will force test 42 to run and verify the repair.
A direct-access storage test error has occurred. Run test 43. If this
reference code continues to occur, exchange the FRU and run test 43
to verify the repair.
Probable
Cause
A direct-access storage test error has occurred. Run test 44. If this
reference code continues to occur, exchange the FRU and run test 44
to verify the repair.
Action
A timer test error has occurred. Run test 49. If this reference code
continues to occur, exchange the FRU and run test 49 to verify the
repair.
A microprocessor test error has occurred. Run test 45. If this refer-
ence code continues to occur, exchange the FRU and run test 45 to
verify the repair.
Run test 2. 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.
21 F7931
1
21F7930
The BOT/EOT sensor cable may not be connected. Check that the
cable to FRU 21 F7930 is connected correctly. Run test 89.
If this reference code continues to occur, exchange the FRUs as
needed, and run test 89 after each FRU is exchanged to verify the
repair.
- - -
The speed encoder cable may not be connected. Check that the cable
to FRU 21 F7932 is connected correctly. Run test 86. If test 86 fails,
exchange 21 F7932 and run test 86 to verify the repair. If test 86 was
correct at the start, run test 95.
If this reference code continues to occur, exchange the remaining
FRUs as needed, and run test 95 after each FRU is exchanged to verify
the repair.
The BOT/EOT sensor cable may not be connected. Check that the
cable to FRU 21 F7931 is connected correctly. Run test 45.
If this reference code continues to occur, exchange the FRUs as
needed, and run test 45 after each FRU is exchanged to verify the
repair.
21 F7938
1
21F8063
The front panel cable may not be connected. Check that the front
panel cable (FRU 21 F7931) is connected correctly. Run test 0.
1-22
9348
Service Information
21 F7917
21 F7924
10%
4%
If this reference code continues to occur, exchange the FRUs as
needed, and run test 0 after each FRU is exchanged to verify the