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Table
6-7.
VCG
Circuit
Indication:
Generator
does
nor
respond
correctly to
dial
and
VCG
input
Check
1
.
Sei controls
to
initial
positions (refer to
paragraph
6
4>
2.
Check
for
approximately
+
1
5V
at
E
11
3
Check
tor
0
±5 mV
at
Ut
pin
13.
4
Check
U1
pin
14
for
approximately
-5V
5
Chock
that
as
the
dial
is
rotated
from 4 0
to
004.
me
voltage
at
U1
pm
14 varies
from
approximately
- 5
to
0V
6
Ensure
that
Ui
pm
5
remains
at
a constant
0V
2
40
mV
as
the
dial
Is
varied
7.
Check
that,
as
the
dial
is
rotated
from
004
to
4
0. the
voltage
at
Ui
pm
1
does
not saturate
near
-
15V
or
15V
(typical
range
is
between
-
10V and
10V)
and
stops
varng
with
the
d>ai
8
Chock
that
as
tho
dial
is
rotated
from
004
to
4
0.
U6
on
8
vanes
from
approximately
-15V
to
-
10V
9
Check
that,
as
the
dial
is
rotated
from
004
to
4
0.
me
voltage
at
Ui
pin
7
does
not saturate
near
15V
o»
-
15V
(typical
rango
a
between
+
10V
and -
10V)
and
stops varying w.tn
tho
dial
10
Check
that,
as
the
d.al
is
rotated
from
004
to
4.0.
U4
pin
13
varies
from
approximately
15V
to
10V
1
1 .
Check
for
nonlinearity
in
the
±
1
25V
triangle at
the emitter
of
01
1
near
the
bottom
of
the
x
IK
through
x
1M
ranges
12.
Check
frequencies
of
x
IK.
x
10K and 100K
ranges
13.
Check
frequency
and
linearity of
x
1M
range
14
Check
frequencies
of
xl.
x
10
and
x
100 ranges
15.
Select
log
mode.
Check
that
as
the
frequency
dial
is
rotated
from
4
0
to
.0004.
U3
pm
4
varies
from approximately
- 65V
to
- 45V
If
Faulty.
Check
Check
for
normal
operation
a ElO.
Ell
and
E12
wiring
b
15V
supply
c.
Dial
potentiometer
UI.
UI.
UI.
ui.
U4.
and
U6
circuits
06.
Ui.
and
U6
circuits
U6. Ui.
and
06
cif
cuits
U4
and
UI
circuits
U4
and Ui
circuits
a Associated timing
capacitors
or
C36
b
US.
CR6
c
09.010
a Adjust
Ri9
b
C30.
31
and 32
(trimmed by
C20).
a
C34
b
C36
nominal
value
c.
C18.
19.
20
and
21
RB6
and
table
6-9
I
a
U3
b
UI
circuit.
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