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Service Inf orma tion
7957A/7958A
VOLUME 0 DESCRIBE FIELD
MAXIMUM CYLINDER ADDRESS ....••••.••..•...........•.......•
1012
1012
MAX I MUM HEAD ADDRESS .................................•....
4
7
MAXIMUM SECTOR ADDRESS ....................................
62
62
MAXIMUM SINGLE-VEC ADDRESS ................................ 319094
510551
CURRENT I NTERLEAVE FACTOR .•.........•.....................
4-14.
Self-Test Controls
The disc drive self-test controls include a red/green FAULT/ON LINE indicator
on the front panel (see Figure 4-6, Self-Test Display). Information regarding the
use of these controls and indicators is provided in the following paragraphs.
4-15.
Fault/On Line Indicator
4-16.
4-10
The FAULT/ON LINE indicator is a red/green display which signals the
operating status of the disc drive. When line voltage is applied to the disc drive.
the FAULT (red) and ON LINE (green) portions of the display will illuminate
for 5 seconds while the CEC PCA-A2 runs Self Test and the Disc Drive
Assembly PCA-A 1 spins up. Next, the green portion will flash during the time
that the disc drive is executing its internal self-test routines. Self Test takes
between six and twelve seconds to complete. If the disc drive passes self test, the
display will change to a solid green. If the disc drive fails self test, the display
will change to a solid red with a flashing green indicating that the self-test failure
has occurred. but that the self-test routines are still accomplishing some
"housekeeping" tasks. When these tasks are complete, the green indicator will
extinguish, indicating that the disc drive is ready to accept host commands such
as diagnostics. The green indicator will flash again when the disc drive attempts
to respond to these commands. A solid red and green display indicates that the
CEC PCA-A2 has failed self test.
After a successful self test, a solid green display indicates that the disc drive is
idle and a flashing green display indicates that the disc drive is active.
Internal Diagnostics
The disc drive internal diagnostics includes self-test routines and run time error
and fault reporting circuits. The self-test routines, activated at power on, consist
of a series of subtests which check the overall operation of the disc drives.
When the disc drive is powered on, the red and green LED's will both be on for
about 5 seconds while the CEC PCA-A2 tests its memory. If the memory self
test fails, both LED's will remain on and the disc drive will not attempt to come
on line. If the memory self test passes then the red LED is turned off and the
green LED flashes, as the self-test sequence establishes communications with the
Disc Drive Assembly PCA-A I to attempt seeks and read/write tests. If the
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