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Model 3400A
Section
V
Table
5-6.
Troubleshooting Procedure
i
CHECK
PROCEDURE
ACTION
®
©
Apply a
1
volt
400
Hz
signal
and
set
the
3400A
to
the
1
volt
range.
Measure
ac signal
at
junction
of
C413
and C415.
The
reading should be
between
240
mV
and
280
mV
RMS.
PASSES: Proceed
to
©
FAILS:
Proceed
to
(l9)
(Trouble proceeding
the
Chopper
Amplifier)
PASSES: Proceed
to
®
FAILS:
Proceed
to
©
(Trouble
in
the
Chopper
Amplifier).
Do
not
use an extender board
for
measurements
on Chopper
Amplifier
board
A6.
Measure
ac
signal
at
junction
of
C605
and
Demodulator V503 and
V504.
Refer
to
Figure
5-6
for
waveform.
Figure
5-6.
Input to
Demodulator
Table
5-6.
Troubleshooting Procedure
(Cont'd)
CHECK
PROCEDURE
ACTION
®
©
Investigate
meter
(Ml), R5,
and
R6
for opens.
Remove
the
input to
3400A.
Unsolder red
lead
from
pin 13 (A6)
and
insert
a +10
mV
dc signal
from
738BR
through a 499
kfi
resistor (-hp-
Part
No. 0757-0327)
to pin
13.
Measure
ac signal
at
positive side
of
C605.
Refer
to
Figure
5-7
for
waveform.
PASSES: Proceed
to
©
FAILS:
Proceed
to
@
01768-4
5-9

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