Fluke 93 Service Manual page 134

7'8 CORRECTIVE MAINTENANCE
MICROPROCESSOR
01201
3.
Measure on
connector
contact
X1 201
/6 to test
the microprocessor
D1201
Corrects
0.5 Hz.
Incorrect (defect
microprocessor D1201
)
*• not O.S Hz.
OPTICAL ItiXERPACE
4.
Shine
with
a
lamp
In
the
"Optical interface
*
holes
to
test
the optical interface receiver.
5.
Measure on
the transceiver
line
D1
201/32.
Apply
li^ht
and
verify that
the signal
level
changes from
OV
DC
(dark) to
0.3V
DC
(tight).
ADDRESS/DATA
LINES
6.
Measure on address/data
t>u$
OO (ADOO,
D1201/2J.
Correct
=
Logic
0.
All
Other
address data
lines
(AD01
to
ADI
5) are
logic
1
(-i-SV).
7.
Ground and
release testpoint
TP21
7
(first
time)
and
the next address/data
AD01
line
will
go low
(to logic
0).
Continue grounding and
releasing testpoint
TP2
17
until
address/data
line
AD15
goes low
(fifteenth time).
With steps 6
and 7
the buffered addresses throughout the
whole
instrument are
active
and can
be
traced.
RAMS
D1204
AND
D1206.
8.
The
next grounding
of testpoint
TP21
7
(sixteenth time) starts
the
RAM
test
of the
first
RAM
D1204. Measure on
conr^ector contact XI 201/6.
During
the
RAM
test
connector contact
starts at
logic 0.
RAM
correct
*
0.5 Hz,
HAM
incorrect
=
logic
1
9
.
G
rou n
d
and
rel
ease
testpoint
TP2
1
7 (seventeenth
ti
me)
to start
the
R
AM
test of
^e
secon
d
RAM
D1206. Measure on
connector contact XI
201/6.
During
the
RAM
test
connector contact XI 201/6
starts at logic
0.
RAM
correct
*
0.5 Hz.
RAM
incorrect
s
logic
1
ESTABLISHING COMMUNICATION.
to.
After the
seventeenth time
of
grounding TP217,
the
ScopeMeter sends an
<XON>
via
the
RS-232
interface.
Now
communication
is
established,
it
is
possible
to
reprogram
the
PI
ash
ROMs.
For
special
software contact your nearest
Fluke/Ph^lipe
Service Center.
1
1
.
Ground
testpoint
TP216
one more
tme
to
abort the Kernel
Test.