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SECTION
2
ELECTRICAL
ADJUSTMENTS
2-1,
ELECTRICAL
ADJUSTMENTS
FM
SECTION
¢ FM
Discriminator (NULL)
Adjustment
Setting :
FM
RF stereo signal
generator
Carrier frequency : 98MHz
Output level :
25dB uz
Modulation :
1kHz
FM ANTENNA
3002
75kHz dev.
terminal
(10096)
VOM
ap
(DC range)
NULL terminal
Procedure :
1,
Tune
the set to 98MHz,
2.
Adjust
T21
for OV reading on
the VOM.
Note:
FM
Tuning level adjustment should be made after FM
discriminator
adjustment,
e FM
Tuning
Level
Adjustment
Setting :
FM
RF stereo signal
generator
Carrier frequency : 98MHz
Output level :
60dB us
Modulation :
IkHz
75kHz dev.
(10096)
FM ANTENNA 300Q
terminal
Procedure :
1.
Tune
the set to 98MHz,
2.
Adjust
RV24
so that the STEREO
LED
goes
on.
Note
on Ceramic
Filter (CF1, 2) Replacement.
This
set employs
two
ceramic
filters (CF1, 2) which
should
have
the
same
color
marking
to
identify
their
center
frequency. Therefore
FM
IF offset adjustment
by (*A,
*B)
connection
is necessary
to match the center frequency of the
ceramic
filters used
with
FM
intermediate
frequency.
color marking
la
(CFI, 2)
«FM
Stereo
Separation
Adjustment
Setting :
FM
RF stereo signal
generator
VTVM
FM ANTENNA
300 Q
REC OUT
terminal
Carrier frequency :
98MHz
Output level:
60dB u
Modulation :
Audio (1kHz) :
33.75kHz dev. (4596)
Pilot (19kHz) :
7.5kHz dev. (109)
Sub-channel (38kHz) : 33.75kHz dev. (4596)
Procedure :
Tune
the set to 98MHz,
FM
stereo
signal generator
output channel
VTVM
connection
VTVM
reading (dB)
Adjust RV21
for
minimum
reading.
Adjust RV21
for
minimum
reading.
L-CH Stereo separation : @ —-®
R-CH Stereo separation: © -@®
The
separations
of both
channels
should
be equal.
O:
short
x : open
FM intermediate
frequency
Color | Center frequency | *A
*B
mark
(MHz)
(D134) | (D135)
x
O
O
Ceramic filter
(MHz)
oO
Oo
x
2.
o
¢« Auto
Stop
Level
Adjustment
Setting :
FM RF stereo signal
generator
FM ANTENNA
3002
terminal
Carrier frequency : 98MHz
Output level :
40dB uw or 454B
Procedure :
REC OUT
AM SECTION
e AM
Tuning
Level
Setting :
AM RF
signal generator
Put the lead-wire
Ww
antenna close to
the set.
(Em
3096 amplitude
modulation
by
400Hz signal
Procedure :
1,
Tune
the set to 1,050kHz,
AM LOOP ANTENNA
ob
"|
AM
antenna
terminal
Adjustment
Location : Tuner
board
(SURROUND
BOARD)
RV25
[AUTO STOP LEVEL ADI |
STOP LEVEL
ADJ
S RV22
r]
TPI Ter
RV21
RV24
Ry 721
FM TUNING
LEVEL ADJ
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