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731B
4-25.
TROUBLESHOOTING
4-26.
Before attempting
to
troubleshoot the
73
1
B,
it
should be
verified that
the trouble
is
actually
in
the instru-
ment
and
is
not caused
by
faulty external
equipment
or
connections.
Then
the
performance
test
should be execu-
ted to localize the
problem.
4-27.
Check
output
voltages
at
each
position
of
the func-
tion switch.
The
lOV
output
must be
correct or
all
volt-
ages
will
be
incorrect.
If
the
lOV
output
is
correct
but one
or
more
other outputs
are incorrect,
check
calibration
of
the divider associated
with
the faulty
output and check
for
proper
resistance
values
in
the divider.
4-28.
The
voltage
at
the collector
of
Q1
should
be approx-
imately
17V
dc
for line
operation
and
14V
dc
for
battery
operation.
If
these voltages are correct
but
the
lOV
output
is
incorrect, either
U1
or
U2
in
the
Reference Supply
is
defective.
Figure
4-6.
EQUIPMENT CONNECTIONS FOR ABSOLUTE
VOLTAGE ADJUSTMENT
4-
7/4-8
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