8.
The
display should
be
correct
and
reflect
the
total
memory in
the
computer,
If
the
self-test display
is
correct, skip
to
Step
9.
If
the
self-test display
is
incorrect,
the
nlonitor, processor
or
video
board
may
be
defective.
Replace these
and
test
as required
to
get
the
correct display.
9.
Turn
the
computer
off
and
install
the
HP-HIL interface
and
cable,
then
install
the
key-
board.
10.
Turn
the
cornputer on
and
observe
the
self-test display. Check
the
keyboard
to
see if
the
self-test sequence responds
to
the
keyboard.
If
the
response
is
correct, you now have a
Minimum Functional Systenl.
If
the
response
is
incorrect, go on
to
Step
11.
11.
If
the
response
to
the
keyboard
inputs
in incorrect,
the
keyboard, its electronics,
or
cable
could be defective. Replace each until keyboard response
is
correct.
To have a Mininlum Functional System,
the
following
hardware
must
perform
the
indicated
functions as shown in Table
5-
2.
Table 5-2. Minimum Functional System
Assembly
Power
Supply
Processor
Board
One
Memory
Card
Video
Board
Functions Performed
All voltages normal
and
within specifications.
CPU
chip executes self-test, cycles memory,
most instructions executed
OK.
Addresses,
read/writes,
and
refreshes.
Processes
and
outputs
video.
Keyboard
and
its
Interface
Inputs
data
that
is processed.
Monitor
Displays Self-Test information.
Once
this
level
of
operation
is
achieved, a similar process can
be
used
to
install
and
check
other
accessories, interfaces,
and
peripherals in
the
complete system.
This
also
may
be
a good point
to
load
and
run
one
of
the
computer
tests. Refer
to
the
Test Tools
manual
for
tests
information
such as:
• Minimum
Hardware
Configuration Required.
•
Computer
or
System Test Loading
and
Running.
•
Interpreting
Test Results.
Series 300 Test Tools are explained in
the
next
section.
110
Troubleshooting
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