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5-6.
MPX
DECODER ALIGNMENT
(a)
Modulate
the FM
signal generator
output
by FM
stereo
MPX
modulator.
(b)
Turn the
selector
switch
to
FM
AUTO.
(c)
Connect
the FM
sigrtal generator
to
the
FM
antenna
terminals.
(d)
Set
the
condition
of
the FM
stereo
MPX
modulator
to
modulation: main
1
kHz
(L
+
R)
6OVo,
pilot 8
tUVo.
(e)
Set
the output
level
of
the FM
signal
generator
to
60
dB.
(f
)
T\rrn the tuning knob to
maximum
reading
on
the
signal
meter.
(g)
Set the modulation
of
the FM
stereo
MPX
modulator
to
pilot
only.
(h)
Connect
the
oscilloscope
to
TP2.
(i)
Adjust the
transformers
(T13,
T!4,
Tf
f)
until
the output
level
of the
19
kHz
becomes
maximum
on
the
scope.
(j
)
Set
the
condition
of the FM
stereo
MPX
modulator
to
the pilot with
L
or
R
signal.
(k)
Connect
the
dual-trace oseilloscope
and
V.T.V.M.
to
the TAPE REC
terminals.
(l)
Adjust the
semi-fixed potentiometer
on
the
AF
printed circuit
board
until
the
output
level
of
the
L
or
R signal
becomes
maximum
on
the
scope.
OSCILLOSCOPE
ADJUSTING
POINT
5-7. CHECKING
SCA
FILTER
(a)
Connect
the FM
signal generator
to
the
FM
antenna
terrninals.
(b)
Turn the
selector
switch
to
FM
AUTO.
(c)
IVlodulate
the FM
signal
generator
con-
nected
to the
audio
generator,
check
the
frequency
responsce
for
the
deep
dips
at
around
67
k}Jz and
7
2
kHz
in
the frequency
response.
5-8. CHECKING
STEREO
INDICATOR
(a)
Connect
the FM
signal generator
to
the
FM
antenna
terminals.
(b)
Turn the
selector
switch
to
FM
AUTO.
(c)
Modulate
the FM
signal
generator
con-
nected
to
the FM
stereo
MPX modulater,
and
set the FM
stereo
MPX
modulator
pilot oh,
and check the
stereo.indicator
lamp
for
lights, set
the FM
stereo MPX
modulator
to pilot off,
and
check
the
stereo
indicator lamp
for
goes out.
ANTENNA TERMINALS
REAR
PANEL
DUAL
TRACE
MPX
STEREO
OSCILLOSCOPE
MODU
LATOR
FM
SIGNAL
GEN
E
RATO
R
19
kHz
CARRlER
OUTPUT
PATTE
RN
:r:
TAPE
REC
DUMMY
ANTENNA
'e'o./
0
E E
0
-
^
a
Tt
'
rn,,
@@
@"6"@l
o",Al;
,
"d'',,- ',,,
'"
E
| 9O u
lU
i
r--',
l@l
t
c.
'
J\-,lf re !_Lrr-r'
r"
L
'#
a@i @@o
- \ /
T"
6b
o
a@
6t
(0
oD:l
:
J I oJ
o
oo
oooo
:r:
ooo
ooo
@o=
ooo
t2
Fig.
7
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