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INSTRUCTION MANUAL
MAINTENANCE
Digital Multimeter
Models
172A.
173A
-.
TABLE 6-3
Line
Power
Checks
step
Item/Component
Required
Condition
Remarks
I
SO01 Line
Voltage
Must
be set
to 230V
or
115V
a~
switch".
appropriate.
2
FOOI Line
Fuse ;*
Continuity.
3
J/PlOO7*
Properly
mated.
4
~1008
line
cord
Plugged
into
live
receptacle.
5
Turn
on power
(Line
switch).
NOTE: Output
from
CR002
should
be)
+12.6V.
out-
put
from
CR001 )
?26V.
6
+5V pad"
+5vo1ts
-e5%.
7
+av pad"
+avo1ts
+5%
output
of
VROOI.
Output
of
VR004,
input
to VROOI.
8
+l5V
pad?:
9
-12V
pad';
IO
-15V
pad"
+15vo1ts
? 5%
-12volts
-c5%
-15volts
-e5%
output
of
VR003.
~~801
t ~801
output
of
VROOZ
NOTE: Hot
regulator
may indicate
shorted
load.
+ On main
printed
circuit
board
(See
Figure
6-2
for
location,
and see sheet
3 of
Schematic
29145E
for
circuit
details).
I
AZl
AZ2
I
SIGNAL
INTEGRATION
I
;
ACAL I
PREFILTER
,
I
OUTPUT
I
I
I
I
I
I
I
I
FON2
~YIZO
rns.-1'200
m5F
FIGURE 6-3.
Waveform
for
Capture
Range Check.
6-19
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