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Installation
2-51.
INSTALLATION
CHECKS
After
the
subsystem has been
installed
and
the
power
connections
made,
visually
inspect
the
installation.
If
the
inspection
verifies
that
everything
is
in
order
and
correct,
proceed
to
the
power-on
sequence
and
installation checks.
1
-
51
.
POWER-ON
SEQUENCE
CAUTION
1
Do
not
attempt
to
operate
the
subsystem
if
the
disc
drive spindle
and
actuator
have
not
been
unlocked.
Do
not turn the
subsystem
power on
or
off
while the system bus
is
in
an
active
state.
Do
not
operate
the
subsystem
if
condensation
is
evident
anywhere
on
it.
Wait
until
all
condensation has
evaporated
before
operating
the
drive.
Do
not operate the
subsystem
until
the
leveling feet
have been
lowered.
Do
not operate the
subsystem
until
the
rear
panel
sound
baffle
is
installed.
Set
both
the
disc
drive rear panel
power
switch
and
the tape drive front panel
power
switch
to
the
1
(on) position.
When
power
is
applied
to
the
subsystem,
both
component
drives
perform
internal
self
test
routines.
The
self
tests
are
initiated
for
approximately 30
seconds
and
7
seconds
for the
disc
and
tape drives
respectively.
Sound
will
be heard
at
power on
as
the fans
come
up
to
speed
and
continue
moving
cooling
air
through
the
drives.
At
the
completion
of the
disc drive's
self
test,
the
letter
P and
a period
(.
will
be displayed
on
its
status
readout
which
is
located
behind
the front panel
and
behind
the
foam
air
filter
on
the card cage
cover.
The
period
indicates
completion
of the
self test
and
the
letter
P
indicates
that the drive has passed
the
self
test.
Successful
completion
of the tape
drive's
self test
routine
is
indicated
by
its
Fault
light
being extinguished
and
a
P
being displayed
in
its
rear
panel
status display.
Any
indication other
than
P.
indicates that
the
disc
drive has
failed
one
of the internal
tests
and
requires
further
testing to
isolate
the trouble
to
a
unique
assembly.
The
testing
is
activated
by
the
Self-Test
or
Diagnostic
switches
which
are
located
behind
the front panel
and
behind
the
foam
air filter
on
the
card cage
cover. Similarly,
if
the tape
drive's
Fault
light
does not go
out, this
indicates that
it
has
failed
one
or
more
of
its
selftests
and
further
testing
should be
carried
out.
The
disc
drive
is
capable
of
locally
executing
three troubleshooting routines
which have
been
programmed
into
the microprocessor
ROM.
All
routines
execute
thorough hardware
checks.
The
power-on
routine
performs
a
full
reset,
delays
certain
tests
until
the spindle
is
up
to speed,
and
tests
all
PCA's.
The
self-test
routine
performs
the
same
tests
as
the
power-on
routine except
that the microprocessor
PC
A
is
not
reset
and no
delays are induced.
When
the
disc
drive
is
first
powered
on,
it is
in
the
normal
mode
(see
figures
2-14 and
2-15). In
the
normal
mode,
momentarily
pressing
the
Self
-Test switch
will
activate the
self
test,
and
momentarily
pressing the
Diagnostic switch
will
activate the
diagnostics.
Simultaneously
pressing
the
Self
-Test
and
Diagnostic switches causes
a
power-on
to
occur
and
is
equivalent
to
turning
the drive
power
switch
to
0
(off)
and
then
to
1
(on)
again.
When
in
the
normal mode,
holding
either
the
Self-Test or Diagnostic switches depressed
until
the display
flashes
causes the
disc
drive to enter
the
supplemental mode.
The
supplemental
mode
should
only
be
used
for
troubleshooting
the
drive.
Once
in
supplemental mode,
a
number
or
the
letter P.
appears
on
the Status
Readout.
A
P
means
that the drive passed
all
tests
which were
run.
If
a
number
appears,
this
indicates
an
error
condition
(see
figure 2-15). Press the
Self-Test
switch
momentarily
to see a
two-digit
error
code
associated
with
the suspect error condition
which
was
displayed.
The two
digits
represent
an
error
code
as
shown
in
figure
2-15.
Pressing
the
Diagnostic switch
momentarily
will
show
the
next suspect condition,
if
any.
Any
time
appears
on
the Status
Readout,
the
last
error
condition
or
last
error
code has been displayed
for that
assembly.
For
a
detailed
list
of
the
disc
2-26
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