Sony HCD-EC50 Service Manual - Page 14

Tuner, - model

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HCD-EC50 Ver. 1.2 TUNER SECTION 0 dB=1 µV [AM] Setting: FUNCTION: TUNER TUNER/BAND button: AM 60 cm loop antenna A loop antenna B AM RF signal generator level meter 30% amplitude modulation by 400 Hz signal Output level: 54 dBuV 32 Ω set + - JACK board PHONES jack (J102) [FM] Setting: FUNCTION: TUNER TUNER/BAND button: FM FM RF signal generator 0.01 µF MAIN board ANTENNA level meter CNP802 pin 1 32 Ω set + - 75kHz frequency deviation by 1K Hz signal MAIN board JACK board ANTENNA PHONES jack (J102) CNP802 pin 2 Output level: as low as possible (8dBuV) digital voltmeter MAIN board 100 kΩ TP (TUNER VT) • Repeat the procedures in each adjustment several times. AM FREQUENCY COVERAGE ADJUSTMENT (US and Canadian models) 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 FREQUENCY COVERAGE ADJUSTMENT (Other models) Adjustment Part Frequency Display Reading on Digital Voltmeter L852 531 kHz 1.5 ± 0.1 V Confirmation 1,602 kHz 7.2 ± 0.5 V AM TRACKING ADJUSTMENT (US and Canadian models) Adjust for a maximum reading on level meter L851 530 kHz AM TRACKING ADJUSTMENT (Other models) Adjust for a maximum reading on level meter L851 531 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 15). [FM DETECTOR ADJUSTMENT] Setting: FUNCTION: TUNER TUNER/BAND button: FM FM RF signal generator MAIN board MAIN board IC801 pin qs ANTENNA (TUNER OUT L-ch) CNP802 pin 1 level meter set + - Carrier frequency: 98MHz Modulation: deviation by FM 75 kHz Output level: 60 dBuV MAIN board MAIN board ANTENNA TP(TUNER-GND) CNP802 pin 2 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. 14

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14
HCD-EC50
TUNER
SECTION
0 dB=1
µ
V
[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 meter
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 (US and Canadian models)
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 FREQUENCY COVERAGE ADJUSTMENT (Other models)
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L852
531 kHz
1.5
±
0.1 V
Confirmation
1,602 kHz
7.2
±
0.5 V
AM TRACKING ADJUSTMENT (US and Canadian models)
Adjust for a maximum reading on level meter
L851
530 kHz
AM TRACKING ADJUSTMENT (Other models)
Adjust for a maximum reading on level meter
L851
531 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 15)
.
[FM DETECTOR ADJUSTMENT]
Setting:
FUNCTION: TUNER
TUNER/BAND button: FM
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
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.
Ver. 1.2