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6-1
6.
SELF-TEST PROGRAM,
DIAGNOSTIC
PROGRAM
6,1.
SELF-TEST PROGRAM, ERROR
MESSAGES
A
self
-test
routine
is
part of
the
normal program.
Malfunctions
of the
central
processing unit
of
the
PM
5390
are traced
internally.
An
error
message
is
output
by
displaying
one numeric
digit
1
...
4
at
the
first
position of the
frequency
display
field,
all
other
elements of
the display being blanked.
Error
localization
of the
CPU:
Displayed numeral
localization
of malfunction
1
EPROM,
System program
2
RAM,
Working
memory
3
CMOS—
RAM,
Data
memory
4
TIMER,
Central timing control
6.2.
TEST-PROM,
DIAGNOSTIC
PROGRAM
For
simple
fault
finding
In
the
digital circuitries
of
PM
5390
and
PM
5390S
several test
programs
can be
realized
by means
of
a special test
PROM.
Moreover
faults
may
be detected
by
other or conventional
methods.
Generally
the
voltages of
the
power
supply should be checked
at
first
(see
table
checks
and
adjustments).
While
the
self-test
routine
is
part of the
normal program,
the diagnostic
program must
be
activated
by
replacing the
built-in
program
memory
IC311/unit
1
of
the
CPU
by
the
test
PROM
PM
5390
(see
fig.
43).
The
instrument
must
be disconnected
from
the
mains
before.
The
PROM
must
properly
be
inserted
in
the
correct direction
—
pins
all
in
and not
bent.
The
test
PROM
PM
5390
should be ordered
directly
via
PHILIPS
Supply
Centre
Service,
Hamburg;
it
has
no
service
code number.
After
POWER ON
2 zeroes
'00'
must
be
visable
in
the 2 leftmost positions of the
frequency
display
field.
If
'88'
is
flashing instead
the
initial
check
has
detected
a
RAM
failure
within IC
318,
unit
1.
Correct
'00'
display allows
the following
test
programs
to
be
selected:
1.
Keyboard
test
Keying-in 01
effects
display
'01'
in
the
1st
and 2nd
position of
the
frequency
display
field.
The
codes
of
the subsequent pushbutton
actions are decimally displayed
in
the
level
display
field;
for the
codes
see
fig.
12.
After
all
keys have been pushed,
the
LEDs
'SINGLE'
and
'CONT'
are
lit.
Now
the
pro-
gram
can be
left
by
successively
pushing
'CONT', 'SINGLE'.
After pushing
'CONT'
the
LED
'CONT'
turns
off;
if
after
this a
different
key
instead of
'SINGLE'
is
pushed,
'CONT'
lightens again.
Fig.
1
2
Keyboard code
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