Sony HCD-EC68P Service Manual page 23

AM FREQUENCY COVERAGE ADJUSTMENT
(Except EC78P: UK model)
Adjustment Part Frequency Display
L801 530 kHz
Confi rmation 1,710 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
(EC78P: UK model)
Adjustment Part Frequency Display
L801 531 kHz
Confi rmation 1,602 kHz
AM TRACKING ADJUSTMENT
(Except EC78P: UK model)
Adjust for a maximum reading on level meter
L805
AM TRACKING ADJUSTMENT
(EC78P: UK model)
Adjust for a maximum reading on level meter
L805
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part Frequency Display
L803 87.5 kHz
Confi rmation 108 kHz
FM TRACKING ADJUSTMENT
Adjust for a minimum reading on level meter
L804
Adjustment Location: MAIN board (See page 24)
FM DETECTOR ADJUSTMENT
Setting:
FUNCTION: FM
FM RF signal
generator
MAIN board
Carrier frequency: 98MHz
ANTENNA
Modulation:
CN801 pin
deviation by FM 75 kHz
Output level: 60 dBuV
1. Turn the set to 98 MHz.
2. Adjust L802 so that modulation distortion may become the
best in the vicinity of the maximum value where the tuner out
level becomes –15dBuV or more.
Reading on Digital
Voltmeter
1.5 ± 0.1 V
8 ± 0.5 V
Reading on Digital
Voltmeter
1.5 ± 0.1 V
7.2 ± 0.5 V
530 kHz
531 kHz
Reading on Digital
Voltmeter
1.75 ± 0.1 V
6.2 ± 0.5 V
98 MHz
MAIN board
IC801 pin
MAIN board
(TUNER OUT L-ch)
ANTENNA
CN801 pin
level meter
+
set
–
MAIN board
JW801 (TUNER-GND)
FM AUTO STOP CHECK
SET
Procedure :
1. Turn the power on.
2. Input the following signal from Signal Generator to FM an-
tenna input directly.
* Carrier Freq : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation : 75 kHz
Modulation : 1 kHz
ANT input : 35 dBu (EMF)
Note: Please use 75 ohm "coaxial cable" to connect SG and the set. You
cannot use video cable for checking.
Please use SG whose output impedance is 75 ohm.
3. Set to FM tuner function and scan the input FM signal with
automatic scanning.
4. Confi rm that input Frequency of A, B and C detected and auto-
matic scanning stops.
The stop of automatic scanning means "The station signal is re-
ceived in good condition".
HCD-EC68P/EC78P
generator
+
75 Ω
23