12
AM Auto Seek/Stop Level Check
Make this check after “FM Auto Seek/Stop Level Adjustment”.
Setting:
[SOURCE]
t
[MODE]
button : AM
FREQUENCY SELECT switch: AM 9 k
Procedure:
1. Set to the test mode. (See page 10)
2. Push the
[SOURCE]
button and set to FM.
3. Push the
[MODE]
button and set to AM.
Display
4. Check that the “AM” indication turns to “AM0” indication on
the display window.
Display
Adjustment Location: See page 13.
AM RF signal
generator
Carrier frequency : 999 kHz
30% amplitude
modulation by
1 kHz signal
Output level
: 30 dB (44.7
µ
V)
±
9dB
(50
Ω
)
set
AM dummy antenna
30
Ω
15 pF
65 pF
antenna jack (CN100)
SHUF
SHUF
FM Stereo
Level meter
Level meter
signal generator
connection
reading (dB)
output channel
L-CH
L-CH
A
B
R-CH
L-CH
Adjust RV1 on TU100
for minimum reading.
R-CH
R-CH
C
D
L-CH
R-CH
Adjust RV1 on TU100
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 26 dB
Adjustment Location: See page 13.
Carrier frequency : 98.0 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%)
set
+
–
AUDIO OUT jack (CN400)
level meter
10 k
Ω
SHUF
TUNER SECTION
0 dB=1 µV
Note:
Adjust the tuner section in the sequence shown below.
1. FM Auto Seek/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. AM Auto Seek/Stop Level Check
FM Auto Seek/Stop Level Adjustment
Setting:
[SOURCE]
button
: FM
FREQUENCY SELECT switch : FM 50 k
Procedure:
1. Set to the test mode. (See page 10)
2. Push the
[SOURCE]
button and set to FM.
Display
3. Adjust with the volume RV2 on TU100 so that the “FM” indi-
cation 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.
Display
Adjustment Location: See page 13.
FM Stereo Separation Adjustment
FREQUENCY SELECT switch : FM 50 k
FM RF signal
generator
Carrier frequency
: 98.0 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 (CN100)
SHUF
Cautions during repair
When the tuner unit is defective, replace it by a new one be-
cause its internal block is difficult to repair.
Procedure:
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