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Table
6-8.
Symmetry
Indication:
Waveform symmetry
problem.
Check
If
Faulty,
Check
1.
Set
controls
to
initial
positions
(refer to
paragraph
6.4).
Check
for
normal
operation.
2.
If
symmetry
problem appears on X1, X10,
x
1
00
ranges
only,
problem
may
be
R90
adjustment
or
go
to
table
6-9.
3.
Perform
steps 5 through 12
of
table
6-7,
then
return
to this table.
a.
R49
adjustment.
b.
R44, adjustment.
4.
Verify
RUN
signal
at
cathode
CR6
is
approximately
+3.5V.
Go
to
table 6-10.
5.
Verify
U6
pin
4 and
U6
pin
15 vary from approximately
-10V
to
-15V
as
dial
is
rotated
from
4.0
to .004.
U1, U6, R52, R53.
6.
Verify
amplitude
of
SQR
signal
at
cathode
CR10
is
approximately
±2V.
a.
Q7
circuit.
b.
U7
circuit.
c.
+
5V
supply.
7.
Check
U5,
CR6.
Table
6-9.
Capacitance
Multiplier
Indication:
Problem on bottom
frequency ranges
only.
Check
If
Faulty,
Check
1.
Set
controls
to
initial
positions
(refer to
paragraph
6.4).
Check
for
normal
operation
on
x
1
K
range.
2.
Check
for
Vdc
at
U11
pins 2
and
6.
SW2
-
SW4.
3.
Check
for
approximately
Vdc
at
U11
pin 12.
U11
circuitry.
4.
Check
for
Vdc
±5 mV
at
U11
pin 10.
a.
R90
adjustment.
b.
U11
circuitry.
5.
Select
X100
range;
check U11
pin
10
for
heavy
oscillations.
C46, U11.
6.
Check
that
the
signal
at
U1
1
pin
2
is
amplified
by approximately 6
at
pin
1
(within
saturation
limits).
U11
circuitry.
7.
Check
for
the
same
signal
at
U1
1
pins
6 and
7
as
at
the emitter
of
Q1
1
SW4,
U11
circuitry.
8.
Ensure
that
R93 and R94
are shorted
in
the
x
100
range.
SW4.
9.
Check
400 Hz
frequency
(4.0
x
100).
a.
R86
adjustment.
b.
R89, R95, C45.
10.
Check
40
Hz
frequency
(4.0
X
1
0).
R93,
SW3.
11.
Check
4
Hz
frequency
(4.0
x
1).
R94.
12.
Check symmetry
at
0.2x100;
ensure
triangle
is
linear.
a.
R90
adjustment.
b.
U11.
c.
Leaky C30, C36, C45, C46,
CR6.
U5. Q9.
6-6
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