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Indica tion: Generator does not respond correctly to dia l and VCG i nput.
set controls to
1 .
i n i tial positions (refer
2.
Check for approximately
3.
Check for 0
5 mV at Ul pin
±
pin
4 .
Check U l
1 4 for approximately - 5V.
5.
that
the
a s
dial
Check
at U l
1 4 va ries f rom approximately
p i n
6.
Ensure that U
pin 5 remains at
1
is varied.
dial
7.
Check that. as the dial is rotated from .004 to 4 . 0 , the
not
does
1
at U 1 pin
between - 1 0V
and
Check
8.
that
the dial is
as
approx imately - 1 5V
Check
as
9
that,
the dial
Ul pin 7 does not satu rate
1 0V and
and stops va rying with the dial.
+
1 0V)
-
1 0
Check that, a s the dia l I s
approximately
1 5V
+
Check for nonlinea rity i n the
the
1 1 .
bottom of
x
the
1 2.
Check freque ncies of x 1 K,
and linearity
Check
1 3.
frequency
1
4.
Che
of
ck frequencies
1 5.
4.0 to
mode.
Select log
Check
. 0004 , U3 p i n 4 va ries f rom
6-6
Table 6-7. YCO Circuit
Check
to pa ragraph 6.4).
l 5V at El l .
+
1
3.
is
4.0 to .004
rotated from
5 to OV.
-
OV
a
constant
saturate
V)
- 1 5V or
nea r
+
1 0
and
va ring with
+
stops
rotated from
.004 to 4 .0. U6 pin 8
to
- 1 0V.
is
rotated from .004 to
r
-
1 5V
+
n e a
l 5V or
rotated
from .004 to 4.0. U 4 p i n 1 3 varies from
1 0V.
to +
1
1 .2SV
±
triangle
K through
1 M ranges.
x
1 0K
and l OOK ranges.
x
of X l M
range.
1 0 an d
1 00
ranges.
x
X
x
1 ,
that as the
frequency
approximately
Scans by
ArtekMedia
the
.
voltage
40 mV
the
±
8S
voltage
l 5V
the
range is
(typical
dial.
varies
from
(typical
4.0.
the voltage at
range is between
a t the emitte r of al l near
dial is
from
rotated
.65V to
.45V.
-
-
2011
=>
If Faulty. Check
Check f or
norma l
ope ration.
a.
E l 0. El l and E1 2 wi ri n g.
b.
l 5V
+
supply.
D ial
c.
potentiometer.
U 1 .
U l .
U l .
U 1 , U4.
U6
and
circuits.
06, U l , and U6
c i rcu i ts.
circuits.
U6, U l , and 06
c'rcuits.
U4
Ul
a nd
U4 and U 1
c i rcuits.
timing
Associated
a.
capacitors or C36.
US. CR6
.
b.
09, 01 0.
c.
Adjust
a.
R 1 9.
b. C30,
(trimmed by C20).
32
31 and
a. C34.
b. C36 nominal
value.
C1 8, 1 9, 20 a nd 2 1
.
c
.
R86 and
6-9.
table
a. U3.
ci rcuit.
b. U1
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