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TUNER SECTION
Cautions during repair
When the tuner unit is defective, replace it by a new one
because 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. FM Signal Meter Adjustment
4. MW Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
SOURCE button: FM
FM RF signal
generator
Carrier frequency
Output level
Mode
Modulation
Procedure:
1. Set to the test mode. (See page 14).
2. Push the SOURCE button and set to FM.
TE
L 13942296513
FM
3. Push the preset 3 button.
FM
4. Adjust with the volume RV2 on TU1 so that the "FM" indica-
tion turns to "FM0" indication on the display window.
But, in case of already indicated "FM0", turn the RV2 so that
put out light "0" indication and adjustment.
Adjustment Location: See page 17.
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0 dB=1 µV
antenna jack (J1)
0.01 µ F
set
: 98.0 MHz
: 22 dB (12.6 µ V)
: mono
: 1 kHz, 22.5 kHz deviation (30%)
Display
REG
INTRO
Display
REG
INTRO
Display
REG
INTRO
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2 9
8
FM Stereo Separation Adjustment
Setting:
SOURCE button: FM
FM RF signal
generator
0.01 µ F
Carrier frequency : 98.0 MHz
Output level
: 70 dB (3.2 mV)
Mode
: stereo
Modulation
: main: 1 kHz, 33.75 kHz deviation (45%)
:
Procedure:
FM Stereo
signal generator
output channel
L-CH
R-CH
R-CH
L-CH
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Q Q
3
6 7
1 3
1 5
Specification: Separation more than 26 dB
Adjustment Location: See page 17.
co
.
– 15 –
9 4
2 8
antenna jack (J1)
10 k Ω
set
LINE OUT (CNJ150)
sub: 1 kHz, 33.75 kHz deviation (45%)
19 kHz pilot: 7.5 kHz deviation (10%)
Level meter
Level meter
connection
reading (dB)
A
L-CH
B
L-CH
Adjust RV4 on TU1
for minimum reading.
C
R-CH
D
R-CH
Adjust RV4 on TU1
for minimum reading.
0 5
8
2 9
9 4
2 8
m
9 9
level meter
+
–
9 9
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