– 15 –
TUNER SECTION
FM Stereo Separation Adjustment
Setting:
[SOURCE]
button: FM
FREQUENCY SELECT switch: FM200 k
Procedure:
FM Stereo
Level meter
Level meter
signal generator
connection
reading (dB)
output channel
L-CH
L-CH
A
B
R-CH
L-CH
Adjust RV4 on TU1
for minimum reading.
R-CH
R-CH
C
D
L-CH
R-CH
Adjust RV4 on TU1
for minimum reading.
L-CH Stereo separation:
A
-
B
R-CH Stereo separation:
C
-
D
The separations of both channels should be equal.
Specification: Separation more than 30 dB
Adjustment Location: See page 17.
Cautions during repair
When the tuner unit is defective, replace it by a new one be-
cause its internal block is difficult to repair.
Note:
Adjust the tuner section in the sequence shown below.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. MW Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
[SOURCE]
button: FM
FREQUENCY SELECT switch: FM200 k
Procedure:
1. Set to the test mode. (See page 14).
2. Push the
[SOURCE]
button and set to FM.
Display
3. Adjust with the volume RV2 on TU1 so that the “FM” indica-
tion turns to “FM ” indication on the display window.
But, in case of already indicated “FM ”, turn the RV2 so that
put out light “ ” indication and adjustment.
Display
0 dB=1 µV
FM RF signal
generator
Carrier frequency
: 97.9 MHz
Output level
: 22 dB (12.6
µ
V)
Mode
: mono
Modulation
: 1 kHz, 22.5 kHz deviation (30%)
0.01
µ
F
set
antenna jack (J1)
FM
97.9
SHUF
97.9
SHUF
FM RF signal
generator
Carrier frequency
: 97.9 MHz
Output level
: 70 dB (3.2 mV)
Mode
: stereo
Modulation
: main: 1 kHz, 33.75 kHz deviation (45%)
sub: 1 kHz, 33.75 kHz deviation (45%)
19 kHz pilot: 7.5 kHz deviation (10%)
0.01
µ
F
set
antenna jack (J1)
+
–
AUDIO OUT jack (J331)
level meter
10 k
Ω
Adjustment Location: See page 17.
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