Sony HCD-EC55 Service Manual page 28

HCD-EC55/EC77/GX99
[FM Auto Stop Check]
SET
Procedure:
1. Turn the power on.
2. Input the following signal from Signal Generator to FM
antenna 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. Confirm that input Frequency of A, B and C are detected and
automatic scanning stops.
The stop of automatic scanning means "The station signal is received
in good condition."
28
generator
+
75 Ω
Adjustment Location and Connecting Points
– MAIN BOARD (Component Side) –
FM Frequency
Coverage Adjustment
AM Frequency
Coverage Adjustment
FM Detector
Adjustment
– MAIN BOARD (Conductor Side) –
CN801
3
FM
ANTENNA
1
AM
IC801 pin wk
(TUNER VT)
28
36 19
IC801
1 18
12
IC801 pin qs
(TUNER OUT L-ch)
CN801
AM Tracking
ANTENNA
Adjustment
L805
L801
L804
FM Tracking
Adjustment
L802
TUNER-GND
3
FM
1
AM