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2
5.
SETTINGS
AND
CONNECTION OF THE SIGNATURE ANALYSER.
!
SETTING
SIGNATURE ANALYSER
CONNECTION SIGNATURE ANALYSER
NAME
EDGE
NAME
TESTPOINT
SIGNAL
NAME
START
"L
(neg)
START
TP
14
pTtI
(D1904
pin 34)
STOP
(pos)
STOP
TP
14
P17I
(D1904
pin 34)
CLOCK
J~
(pos)
CLOCK
TP
15
ALE
{D1911
pin
11)
GROUND
—
GROUND
TP
1
Logic
0
(neg)
D1903
pin
7
AZC/P
QUALIFIER
QUALIFIER
-
iT
(pos)
D1903
pin
2
AZ
NOTE:
1.
The
qualifier
is
only
necessary
for
test
3
and
5.
2.
The
testrom
must
be
placed
in
the
D
1909
socket.
6.
BRIEF DESCRIPTION
OF THE
TESTS
Free run
test
With
this test
it is
possible te
measure
signatures
on
the address
latches
and
the databus of the processor.
This
is
necessary to
check
if
the data can be
taken
from
the testrom.
Test
0 (ram and
I/O
test)
This
test
checks
the
internal
RAM
of
the
microcomputer.
When
the
RAM
is
good
it
will
also test
the
I/O
ports of the
microcomputer.
Only
then can
signatures
be
measured
on
the
I/O
ports,
databus and
ROMs.
It
also activates
the connections of the L.C.D.
unit.
Test
1
(visual
L.C.D.
test,
no
S.A.)
The
test
fills
the
display,
segment
after
segment.
When
a
connection
to
a
segment
is
broken,
that
segment
will
not
light.
When
two
connections
are
short
circuit,
then
two
segments
will
be
lit
simultaneously.
In this test
signature analysis
is
not provided.
Test
2
(switch
decoding
test)
Test 2
activates
the
circuit
necessary for reading
the function
switch,
and
the
+/—
,
AUTO,
DOWN,
UP,
10
Amp.
input
bus,
and
the battery
low
input.
Signatures
can
be
measured
on
IC's
D1912, D1916,
D1919
and on
I/O
port
2.
(P20'
P21
'
P22'
P23'and[P^
)-
The
signatures
on
|P25|
depends
on
the position of the function switch
and
keys, pressed or
not
pressed.
Test
3
(relay /fet
switch
test)
This
test
activates
the
circuit
for relay/fet
switch
control.
Signatures
can
be
measured
on
the inputs of
D1908,
and
the
outputs
driving
the
relays.
The
outputs
of
D1908
are
activated sequentially.
Outputs
driving
the
fet's will
give stable signatures,
but with an
oscilloscope
it is
also possible
to see
if
the
fet's
are switching.
Test
4
(static relay/fet
switch
test,
no
S.A.)
This
test
is
not
intended
for signature analysis.
It
sets
the
relay
/fet's in
the
state,
according to the
selected
function
and
range.
It
can
also
change the
internal
program
status.
With
the
button +/-,
the
polarity
can be
changed
if
the
V-,
Att.,
or the function
trigger
level
is
selected.
With
the
button
AUTO/MAN*,
the
internal
program
status
can be changed, (normal measurements,
AUTOCAL
0,1V
or
IV,
IZERO
200mA
or 2A).
So
it is
possible to
make
measurements
in
the analog part of the
PM2521
.
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