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Troubleshooting and Diagnostics
7936 and 7937
Table 8-2. List of DERROR/TERROR's (22 of 25)
8-36
NUMBER
(hex/dec)
AA/170
AB/I71
AC/I72
AD/I73
AE/174
INTER-
FACE
HP-IB
HP-IB
HP-IB
HP-IB
HP-IB
ERROR
DESCRIPTION
COMMAND ABORT FAULT.
(Fault;
FRU
=
read/wr i te). A discrepancy
exists in the correct status for
assertion of the Write Hold
Off (WHO) signal between the
controller
and
read/write
system.
SERVO OFFTRACK. (Event;
FRU
=
servo).
The servo
system was off track after a
system clear, or was unable to
resettle
on
track
after
a
previous servo error condition.
ILLEGAL
SERVO
COMMAND. (Event; FRU
=
s e rv
0 ) •
The servo system
did not recognize the last servo
command
issued
by
the
controller.
SERVO/CONTROLLER
INTERFACE
FAULT.
(Event;
FRU
=
servo).
The servo system
did
not
recognize the last servo com-
mand issued by the controller.
WRITE
SERVO
TIMING
ERROR. (Fault;
FRU
=
s e rv 0) .
The servo system
reported
a
sampled
servo
timing error during a disc
write.
SUSPECT
ASSEMBLY
1. Read/Write PCA-A2
1. Servo PCA-AI
1. Servo PCA-AI
1. Servo PCA-AI
1. Servo PCA-AI
2. HDA A3
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