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STR-S5L
FM Discriminator Adjustment
Setting:
FM ANTENNA
O.01 p.F
NULL Adjustment
Procedure:
l.
Tune the set so that the noise levels become
symmetrical as shown on the right. (output level
of the signal generator: 5 - l0 dB).
2.
Adjust the secondary side core (black) of T10l
for the minimum reading on the VOM.
3.
Adjust the primary side core (red) of Tl0l for
0V reading on the VOM.
4.
If the noise levels are not symmetrical after
adjustment in step 3, repeat the steps I - 3.
Tune the set so that the
noise levels at the peak
are symmetrical,
Distortion Adjustment
Procedure:
Adjust the secondary side core (black) of Tt0l
for
the minimum distortion. (output level of the signal
generator: 60dB (lmV)).
Note: Repeat the secondary-side and primary-side adjust-
ments several times.
If 0V reading can not be obtained on the VOM after
adjustments, repeat the above steps.
DC range
l.
fune the set to 98 MHz.
2.
Adjust RT202 for l9 kHz t50 Hz on the countel..
B)
Simple Method
Procedure:
l .
T u n e t h e s e t t o t h e F M s t e r e o b r o a d c a s t i n s
signal.
2.
Turn RT202 clockwise or counterclockwise and
m e m o r i z e t h e l i g h t i n g - u p r a n g e o f s t e r e o l a m p .
3.
Secure RT2O2 at the center of the lighting_up
range of both turns as shown below.
x_+la-
center in lighting-up ranges
11
-..i-
\
-t;nnt;nn-"'
\ z
w
- ' J
" ' r
- P
r a n g e
VCO Adjustment
A) Regular Method
P r o c e d u r e :
FM rf signal
generator
èrrier
frequency:
Modulation:
Output level:
O.Ol 1tF
98 MHz
no modulation
1 mV (60 dB)
t--t
*----+-----------rl
vCo check
f--il--l
I
7m frequency counter
NULL
(test point)
Ttol
(secondary
side: black)
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