Fluke 93 Service Manual page 135

CORRECTIVE MAIMTENANCE
7-9
7. 1.6-
3
Test point
signals.
TTie
digital
A1
PCB
Is
provided
wltti
test points,
marked:
"TP'*
See
figure 10.1:
A1
PCS
layout
(component
side).
These can be used
to
check
correct
furtctloning of the
PCB.
All
measurements
are
made
In
the default
MASTER RESET
condition
(start
the
measurements
In
the
ScopeMeter using
MASTER
RESET).
A
MASTER RESET
Is
performed as
fellows:
1
.
Remove
all
signals from the ScopeMeter.
2.
Turn
off
the
ScopeMeter
3.
Hold
down
the
LCD
key and press the
ON/OFF
key
simultaneously.
Two
beeps
are audible, and
all
volatile
memories
(RAM
with battery
backup)
are
reset.
The
ScopeMeter
Is
automatically set
to
the
METER
mode.
Use
another
oscilloscope with high Input
Inpedance and
10:1
probe
to
measure
the signals
on
the
test points.
See
table
7.1:
Table
7. 1.
Overview on
Test Points
on
the
digital
A
1
PCB.
Logic O=0V, Logic
1=+5V
TP Name
Scope
Freq. Data
H/L/A
Description
207
Y40
jTjvin
^rLTLRj
'
595
Hz
A
Output
40,
D1404
20B
Y120
n
n
n
mi
. .
krmj
ni
595
Hz
A
OUput120, D1406
209
Y200
1
—
1
595
Hz
A
Output 200,
D
1407
210
X40
II
1 1
595
Hz
A
Output
40,
D1401
211
X120
J
1
1
]
595
Hz
A
Output 120,
D1402
212 X2O0 1
1
r
1
595
Hz
A
Output
200,
D1403
213
WEN
...U
.
U U
. .
A
Write
Enable Not
point
10
of
D1203
214
REN
jirwirii"..
..
A
Read
Enable
Not
point 11 of
D1203
216
TEST1
'
0
H TEST
1/analog charnel
3,
point
16
Of
D1 201
217
219
TEST2
ON.OFF
muiTL
12.1
kHz
-
0
A
L
TEST
2/timer
2 dock,
point
64
of
D1201
ON
OFF/high speed
input
0.2,
point
53
of
D1201
221
POWER ON
1
0
H
POWER ON