Sony HCD-GB3 Service Manual page 18

HCD-GB3
QQ
3 7 63 1515 0
TUNER SECTION
[AM]
Setting:
FUNCTION: TUNER
TUNER/BAND button: AM
60 cm
loop antenna A loop antenna B
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: 54 dBuV
[FM]
Setting:
FUNCTION: TUNER
TUNER/BAND button: FM
FM RF signal
MAIN board
generator
ANTENNA
CNP802 pin 1
0.01 µ F
set
MAIN board
75kHz frequency
ANTENNA
TE
deviation by 1K Hz
L 13942296513
CNP802 pin 2
signal
Output level: as low as possible
(8dBuV)
MAIN board
100 k Ω
TP (TUNER VT)
• Repeat the procedures in each adjustment several times.
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0 dB=1 µV
level meter
32 Ω
+
set
–
JACK board
PHONES jack (J102)
level meter
32 Ω
+
–
JACK board
PHONES jack (J102)
digital voltmeter
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y
i
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8
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L852
Confirmation 1,710 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L851
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L805
Confirmation
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L804
Adjustment Location: MAIN board (See page 19).
[FM DETECTOR ADJUSTMENT]
Setting:
FUNCTION: TUNER
TUNER/BAND button: FM
FM RF signal
Q Q
3 6 7 1 3
generator
Carrier frequency: 98MHz
Modulation:
deviation by FM 75 kHz
Output level: 60 dBuV
1. Tune the set to 98 MHz.
2. Adjust L806 so that modulation distortion may become the
best in the vicinity of the maximum value where the tuner out
level becomes –15dBuV or more.
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2 9 9 4 2 8
1.5 ± 0.1 V
530 kHz
8 ± 0.5 V
530 kHz
1.75 ± 0.1 V
87.5 MHz
6.2 ± 0.5 V
108 MHz
98 MHz
MAIN board
IC801 pin qs
MAIN board
(TUNER OUT L-ch)
ANTENNA
CNP802 pin 1
1 5 0 5 8 2 9 9 4
level meter
set
MAIN board
MAIN board
ANTENNA
TP (TUNER GND)
CNP802 pin 2
m
co
9 9
2 8 9 9
+
–