Sony HCD-EC70 - Page 19

19
HCD-EC70
TUNER SECTION 0 dB=1 µV
[AM]
Setting:
FUNCTION: TUNER
TUNER/BAND button: AM
[FM]
Setting:
FUNCTION: TUNER
TUNER/BAND button: FM
•Repeat the procedures in each adjustment several times.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: 54 dBuV
60 cm
set
loop antenna A
loop antenna B
+
–
level mete
r
32 Ω
JACK board
PHONES jack (J102)
FM RF signal
generator
75kHz frequency
deviation by 1K Hz
signal
Output level: as low as possible
(8dBuV)
+
–
level meter
set
32 Ω
0.01 µ F
JACK board
PHONES jack (J102)
MAIN board
ANTENNA
CNP802 pin 1
MAIN board
ANTENNA
CNP802 pin
2
digital voltmeter
100 k Ω
MAIN board
TP (TUNER VT)
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L852 530 kHz 1.5 ± 0.1 V
Confirmation 1,710 kHz 8 ± 0.5 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L851 530 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L805 87.5 kHz 1.75 ± 0.1 V
Confirmation 108 kHz 6.2 ± 0.5 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L804 98 MHz
Adjustment Location: MAIN board (See page 20).
[FM DETECTOR ADJUSTMENT]
Setting:
FUNCTION: TUNER
TUNER/BAND button: FM
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.
FM RF signal
generator
Carrier frequency: 98MHz
Modulation:
deviation by FM 75 kHz
Output level: 60 dBuV
+
–
level meter
MAIN board
TP (TUNER GND)
MAIN board
IC801 pin
qs
(TUNER OUT L-ch)
set
MAIN board
ANTENNA
CNP802 pin 2
MAIN board
ANTENNA
CNP802 pin 1