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=>
2011
Table 8-8. Symmetry
Indication: Waveform symmetry problem
.
Check
1 .
Set
controls
to
initial
positions ( refer
to
pa ragraph 6.4).
2. If
symmetry
problem
appears
on
x 1 . X ,
O. X l 00 ranges only. problem
may
be
R90
adjustment
or go to table
6-
9
.
If Faulty, Check
Check
for
n
o
rma
l
ope
r
a
ti
on
.
3.
Perform steps
5
through
1 2 of
table
6-7. then return to this table.
a.
R49
adjustment.
b. R44 .
adjustmen
t.
4
.
Verify
RUN
signal
at
cathode
CR6
i
s
approximately
+
3.5V.
Go
to table
6-1 0.
5
.
Verity
U6 pin
4
and
U6 pin 1 5
va ry
from
approximately
-
1 0 to
-
1 5V as
dial is
rotated from 4.0 to .004.
U1 , UB. AS2. R53.
6
.
Verify
a
mplitud
e
of
SOR signal
at
cathode CRI O
is
approximately
±
2V
.
a.
Q7 circuit.
7. Check US. CAB.
Table 8-9. Capacitance Multiplier
In
d
i
ca
ti
on
:
Problem on bottom frequency ranges only.
Check
1
.
Set
controls
to initial
positions (refer
to
paragraph 6.4
).
b. U7 circuit.
c
.
+
5V s
u
pply
.
Corrective Procedure
Check for
normal
ope ra tion
on x 1 K range.
2
.
Check for 0 Vdc at U "
pins
2 and 6.
SW2
-
SW4.
3.
Check
for approximately 0 Vdc
at
U l 1 pin
1 2.
U 1 ,
ci rcuitry.
4. Check for 0 Vdc ± S mV at U l 1 pin 1 0
.
a.
R90
adjustment.
b. U l ,
c
i
rcui
t
ry
.
5
.
Select
x
1 00 range
;
check U 1 ' pin 1 0 for heavy os
c
illa
ti
ons
.
C46. U l '
.
6.
Check
that the
signa l
at
U 1 1
pin 2 is amplified by approximately B at pin 1 2
U " circuitry.
(within
saturation
limits).
7
.
Check for the
sa me
signal
at
U "
pins 6 and 7
as
at the eminer of 01 1 .
SW4, U l 1 circuitry.
8
.
E
n
s
u
re that R93
and
A94
a re
shorted In the
x
1 00
range.
SW4.
6-7
Содержание 188
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