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Figure
1-8 (Page 2 of 3). 3xx Tape Unit Controller Diagnostic Reference Codes
I
I
Ref
/
PartNumber
Code
Action
The interface cable may not be connected. Check that the interface
cable (FRU 21 F7941) is connected correctly. Run test 0.
If this reference code continues to occur, exchange the FRUs as
needed, and run test
0
after each FRU is exchanged to verify the
repair.
Check that the interface cable (FRU 21 F7941) is connected correctly.
Run test 0.
If this reference code continues to occur, exchange the FRUs as
needed, and run test 0 after each FRU is exchanged to verify the
repair.
If this reference code continues to occur, exchange the FRUs as
needed, and run test 0 after each FRU is exchanged to verify the
repair.
A #-volt power supply unit (PSU) failure has occurred. Run test 0. If
this reference code continues to occur, exchange the FRUs as needed,
and run test 0 after each FRU is exchanged to verify the repair.
An analog-to-digital circuit (ADC) or a speed digital-to-analog circuit
(DAC) error has occurred. Run tests 76, 78, and 0.
If this reference code continues to occur, exchange the FRU and run
tests 76, 78, and 0 after the FRU is exchanged to verify the repair.
A supply motor loop error has occurred. Run test 80. If test 80 fails,
exchange 21 F7927. If test 80 did not fail, run test 76.
If test 76 fails, exchange the remaining FRUs as needed, and run test
76 after each FRU is exchanged to verify the repair.
I
A takeup motor loop error has occurred. Run test 80.
If this reference code continues to occur, exchange the FRUs as
needed, and run test 80 after each FRU is exchanged to verify the
repair.
Quadrature decoder or tachometer circuit error has occurred.+
tests 77 and 82. If either test fails or if this reference code co6tinues to
occur, exchange the FRU and run tests 77 and 82 after the FRU is
exchanged to verify the repair.
The door failed to open. Check if the door is binding or not aligned.
Repair it by adjustment. If a bind or bad alignment cannot be cor-
rected, exchange 21 F7916. If the door is aligned and not binding and
this reference code continues to occur, exchange the remaining FRUs
as needed, and run test 88 after each FRU is exchanged to verify the
repair.
Chapter 1. Analyzing Problems
1-23
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9 '10
There is excess tension arm movement. Run test 85. If test 85 fails,
exchange 21 F7935 and run test 85 again to verify the repair. If test 85
did not fail in the beginning, run test 95. If test 95 fails or if this refer-
ence code continues to occur, exchange the remaining FRUs as
needed, and run test 95 after each FRU is exchanged to verify the
repair.
The servo accelerates too slowly. Run test 95. If test 95 fails or if this
reference code continues to occur, exchange the FRUs as needed, and
run test 95 after each FRU is exchanged to verify the repair.
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