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NUMBER
(hex/dec)
AF/I75
BO/I76
Bl/177
B2/I78
B3/179
Troubleshooting and Diagnostics
7936 and 7937
Table 8-2. List of DERROR/TERROR's (23 of 25)
INTER-
FACE
HP-IB
HP-IB
HP-IB
HP-IB
HP-IB
ERROR
DESCRIPTION
READ
SER VO
TIMING
ERROR.
(Event;
F RU
=
s e
rv 0) .
Servo timing error
occurred during disc read
01'
verify.
SERVO
COMMAND
CANCELED.
(Event).
The
controller has canceled the last
servo command and will ignore
its completion status.
SERVO
RECALIBRATION
REQUIRED.
(Event).
The
servo system requires calibra-
tion prior to accessing the disc.
DATA ERROR OVERFLOW
MISMATCH.
(Fau 1
t;
FRU
=
controller).
The DMA
and ECC circuits of the con-
troller have mismatched data
error overflow status.
WRITE
HDA
OVERCURRENT.
(F
a u
1
t ;
F RU
=
read/wr i te) •
The
read/write system detected an
overcurrent condition in the
head amplifier circuit of the
HDA during a disc write.
SUSPECT
ASSEMBLY
1. Servo PCA-AI
None
None
1. Controller PCA-A6
1. Read/Write PCA-A2
8-37
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