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SECTION
3
ADJUSTMENTS
FM SECTION
Setting:
Band:
FM
1
CAL TONE Level Adjustment
Setting:
VTVM (dc range)
button.
OV reading on VOM.
OUTPUT
should be made.
Procedure:
1. Press CAL TONE switch.
RT603
2. Adjust
RT603
for
—6dB
(0.39V)
reading
on
VTVM.
STANDARD
SIGNALS
FOR ADJUSTMENT:
FM rf Monaural Signal
Carrier frequency:
98MHz
Modulation:
400Hz, 75kHz deviation
(100%)
US, Canadian, E Model
FM rf Stereo Signal
Carrier frequency:
98MHz
Modulation:
Audio 400Hz,
33.75kHz deviation (45%)
Subchannel
33.75kHz deviation (45%)
Pilot 19kHz
7,5kHz deviation (10%)
AEP, UK Model
Discriminator Adjustment
A) Primary Side (NULL)
@ Procedure
VOM {dc range)
@ Procedure:
Note: When the ceramic filter is replaced, these adjustments
ST-S444ES
ST-S444ES
Muting Width Adjustment
Setting:
MUTING/MODE
switch:
ON
B) Secondary Side (DISTORTION)
IF BAND:
WIDE
MODE:
MONO
Procedure:
FM rf signal
generator
VTVM
o.o1uF
LL
aS
page SR
lL set
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j
test point
SS
4
1
FM
ANTENNA terminal
OUTPUT
FM rf Monaural signal
FM ANTENNA
ouTPUT
pee
rmina
R145
Output level:
1mV (60dB)
terminal (752)
Carrier frequency:
Q98MHz
(US, Canadian) +40 — +65kHz
*(AEP, G-AEP, UK, E) +25 —+40kHz
ImV (60dB)
. Receive 98MHz signal.
2. With
a
carrier
frequency
of
98MHz '+40 to.
+6 5kHz +
adjust IFT101
so that output signal is
os
—
-
several times.
Confirm minimum distortion for NARROW
IF BAND.
IFT101
IFT102
. When necessary, repeat above steps so that output
signal
is obtained
at same
frequency
detuning
point
to both
plus and minus
directions within
10kHz.
FM Muting Level Adjustment
Setting:
IF BAND:
WIDE
FM ANTENNA terminal
OUTPUT
(75Q)
FM rf Monaural signal
Output level:
12.6uV (220B)
Procedure:
1. Mode:
MUTING
ON
4, Mode:
MUTING
OFF
5. Turn
RT102
(NARROW)
at the position where
test point
Gate Voltage Adjustment
VTVM (dc range)
Adjust
RT601
so that gate voltage
of
Q601
is
1.8V
(+0.1V)
at
87.5MHz.
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