Realistic STA-85 - Page 9

MPX ALIGNMENT
TAPE OUT
FM
ANTENNA
TE RM
I NAL
RECEIVER
(300
s,)
tr-
Fig.3
MPX
ALIGNMENT
CONNECTION
MAIN
AMPLIFIER
ALIGNMENT
FRONT
END
L103,
L101
L102,
TC101
TCl02,
TC103
FM
SIGNAL
GENERATOR
FM
DUMMY
ANTENNA
300 f2
FM
IF
T201
VR2O3
vR2o,4
STEREO
MODULATOR
Set SELECTOR Switch to FM.
Tune
for
98
MHz
on band.
Signal Generator output level:
1000pV. Deviation:
75kHz,
at
100%
modulation
of
composite
signal.
Connect
Signal Generator
to
FM
Antenna
Terminal through FM
Dummy Antenna
(300
S.)).
ST EP
19 kHz
(PILOT
SIGNAL)
MODULATION
Level
SIGNAL
GENERATOR
Freq.
Set to
OUTPUT
INDICATOR
Connected to
ADJUST
Refer Fig.
4
ADJUST
FOR
NOTE
1
8To
Composite
1 kHz
R channel
AC
Voltmeter to
TAPE
OUT
jack
of
R
channel
Adjust input
for
audio output
of
about 0.65 V
2
8%
Composite
1 kHz L channel
AC Voltmeter to
TAPE
OUT
jack
of
R
channel
VR301 Minimum
AC
Voltmeter
reading shou ld
be at least 30
dB below
reading
in
step
1.
3
8Yo
Composite
1 kHz R
channel
AC Voltmeter
to
TAPE
OUT
jack
of L channel
VR301 Minimum
Same as
Step
2.
4 PILOT
OFF Carrier
only
Frequency
Counter Connect
to TP
(#10
pin)
of
PCB
0055 and
ground
VR3O2
19
kHz
lf
you
did not
obtain
-30
dB readings
in steps 2
and
3
(compared
with
step 1), readjust VR301
until
you
obtain
-30
dB
reading for
both
steps
2
and 3.
INDICATOR ADJUSTMENT REMAR KS
DC Voltmeter
VR601 a. b
Adjust
for
0.005
V
-
0.015
V across
R623
a,
b with no signal