Read Sony HCD-EC68W / MHC-EC68W Service Manual online
HCD-EC68W
20
Adjustment Location: MAIN board (See page 21)
[AM]
Setting:
FUNCTION: AM
Setting:
FUNCTION: AM
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 (J492)
MAIN board
ANTENNA
CN801 pin
[FM]
Setting:
FUNCTION: FM
Setting:
FUNCTION: FM
FM RF signal
generator
75 kHz frequency
deviation by 1 kHz
signal
Output level: as low as possible
(8 dBuV)
+
–
level meter
set
32
Ω
0.01 F
JACK board
PHONES jack (J492)
MAIN board
ANTENNA
CN801 pin
MAIN board
ANTENNA
CN801 pin
digital voltmeter
100 k
Ω
MAIN board
IC801 pin XL (TUNER VT)
• Repeat the procedures in each adjustment several times.
TUNER SECTION
0 dB = 1
μV
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital
Voltmeter
L801
530 kHz
1.5 ± 0.1 V
Confi rmation
1,710 kHz
8 ± 0.5 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L805
531 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital
Voltmeter
L803
87.5 kHz
1.75 ± 0.1 V
Confi rmation
108 kHz
6.2 ± 0.5 V
FM TRACKING ADJUSTMENT
Adjust for a minimum reading on level meter
L804
98 MHz
FM DETECTOR ADJUSTMENT
Setting:
FUNCTION: FM
Setting:
FUNCTION: FM
FM RF signal
generator
Carrier frequency: 98 MHz
Modulation:
deviation by FM 75 kHz
Output level: 60 dBuV
+
–
level meter
MAIN board
JW801 (TUNER-GND)
MAIN board
IC801 pin RT
(TUNER OUT L-ch)
set
MAIN board
ANTENNA
CN801 pin
MAIN board
ANTENNA
CN801 pin
1. Turn the set to 98 MHz.
2. Adjust L802 so that modulation distortion may become the
2. Adjust L802 so that modulation distortion may become the
best in the vicinity of the maximum value where the tuner out
level becomes –15 dBuV or more.
level becomes –15 dBuV or more.
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