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Table
6-7.
VCG
Circuit
Indication:
Generator does not respond
correctly
to dial
and
VCG
input.
1
.
Set
controls
to
initial
positions
(refer to
paragraph
6.4).
2.
Check
for
approximately
+15VatE11.
If
Faulty,
Check
Check
for
normal
operation.
a.
E10, Ell
and E12
wiring.
b.
+
15V
supply.
c.
Dial
ootentiometer.
3.
Check
for
0
±
10
mV
at
U1
pin 13.
4.
Check
U1
pin
14
for
approximately
-5V.
5.
Check
that
as
the
dial
is
rotated
from
4.0
to .004,
the voltage
at
U1
pin
14
varies
from approximately
-5
to
0V.
6.
Ensure
that
U1
pin
5 remains
at
a
constant
0V
±40
mV
as
the
dial
is
varied.
U1, U4,
and
U6
circuits.
7.
Check
that,
as
the
dial
is
rotated
from
.004
to 4.0,
the voltage
at
U1
pin
1
does
not saturate
near
-
15V
or
+
15V
(typical
range
is
between
-
10V and
+
10V)
and
stops varing with
the
dial.
06, U1,
and
U6
circuits.
8.
Check
that
as
the
dial
is
rotated
from
.004
to 4.0,
U6
pin
8
varies
from
approximately
-15V
to
-10V.
9
Check
that,
as
the
dial
is
rotated
from
.004
to
4.0,
the voltage
at
U1
pin
7
does
not saturate
near
+
15V
or
-
15V
(typical
range
is
between
+
10V and
-
10V)
and
stops varying with the
dial.
10
Check
that,
as
the
dial
is
rotated
from
.004
to 4.0,
U4
pin
13
varies
from
approximately
+
15V
to
+10V.
U6, U1,
and
Q6
circuits.
U4
and
U1
circuits.
U4
and U1
circuits.
1 1
.
Check
for
nonlinearity
in
the
±
1
,25V
triangle
at
the emitter
of
Q1
1
near
the
bottom
of
the
x
1
K
through
x 1M
ranges.
a.
Associated
timing
capacitors
or
C36.
b.
U5,
CR6.
c.
Q9, Q10.
12.
Check
frequencies
of
X1K,
x
1
0K
and
100K
ranges.
a.
Adjust R19.
b.
C30,
31
and 32
(trimmed by
C33).
13.
Check
frequency
and
linearity
of
x
1
M
range.
a.
C34.
b.
C36.
c.
Cl
8,
19,
20 and
21.
14.
Check
frequencies
of
xl,
x
10 and
x
100
ranges.
R86
and
table
6-9.
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