Table 6-7. YCO Circuit
Indication: Generator does not respond correctly to dial and VCG input.
Check
1 .
set controls to
initial positions (refer
to paragraph 6.4).
2
.
Check for approximately
+
l 5V at El l .
3. Check for 0
±
5 mV at Ul pin
1 3
.
4. Check U l
pin
14 for approximately - 5V.
5.
Check
that
as
the
dial
is
rotated from
4.0 to
.
004
.
the
voltage
at U l
p in
1 4 varies from approximately
-
5 to OV.
6
.
Ensure that U
1
pin
5 remains at
a
constant
OV
±
40 mV
8S
the
dial
is varied.
If Faulty. Check
Check for
norma l
ope ration.
a
.
E l 0. El l and E1 2 wiring.
b.
+
l 5V
supply.
c.
Dial
po
t
entiom
e
t
er
.
U1 .
U l .
Ul .
U 1 , U4.
and
U6
c
i
rcuits
.
7. Check that. as the dial is rotated from .004 to 4.0, the
voltage
06, U l , and U6
circu i ts.
at U 1 pin
1
does
not
saturate
nea r
- 1 5V or
+
l 5V
(typical
range is
between - 1 0V
and
+
1 0
V)
and
stops
varing with
the
dial.
8
.
Check
that
as
the dial is
rotated from
.004 to 4.0. U6 pin 8
varies
from
U6, U l , and 06
circuits.
approximately - 1 5V
to
- 1 0V.
9
Check
that,
as
the dial
is
rotated from .004 to 4
.
0
.
the voltage at
U4
and
Ul
c'rcuits.
Ul pin 7 does not saturate
n
e
a
r
+
l 5V or
-
1 5V
(typical
range is between
+
1 0V and
-
1 0V)
and stops varying with the dial.
1 0 Check that, a s the dial I s
rotated
from .004 to 4
.
0. U 4 pin 1 3 varies from
approximately
+
1 5V
to +
1 0V.
1 1 .
Check for
nonlinea rity
in the
±
1 .2SV
triangle
at the emitter of al l near
the
bottom of
the
x
1
K through
x
1 M ranges.
1 2. Check frequencies of x 1 K,
x
10K
and l OOK ranges.
1 3. Check
frequency
and linearity
of X l M
ran
g
e
.
1
4
.
Che
ck frequencies
of
x
1 ,
X
1 0 and
x
1 00 ranges
.
1 5.
Select log
mode.
Check
that as the
frequency
dial is
rotated
from
4.0 to
.0004, U3 pin 4 varies from
approximately
-
.65V to
-
.45V.
6-6
Scans by
ArtekMedia
=>
2011
U4 and U 1
c i rcuits.
a.
Associated
timing
capacitors or C36.
b
.
US. CR6
.
c.
09, 01 0.
a.
Adjust
R 1 9.
b. C30,
31 and
32
(trimmed by C20).
a
.
C
3
4
.
b. C36 nominal v
a
lue
.
c
.
C1 8, 1 9, 20 and 21
.
R86 and
table
6-9.
a. U3.
b. U1
circuit.
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