HCD-EC69/EC79/EC99
HCD-EC69/EC79/EC99
19
19
FM DETECTOR ADJUSTMENT
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
CN801 pin
MAIN board
CN801 pin
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 –15 dBuV or more.
FM AUTO STOP CHECK
generator
SET
+
75
Ω
Procedure :
1. Turn the power on.
2. Input the following signal from Signal Generator to FM an-
tenna input directly.
Carrier frequency : 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. Con
fi
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”.
Adjustment Location and Connecting Points:
– MAIN Board (Component Side) –
– MAIN Board (Conductor Side) –
L805
AM Tracking
Adjustment
L804
FM Tracking
Adjustment
L803
FM Frequency
Coverage
Adjustment
L802
FM Detector
Adjustment
IC801
JW801
(TUNER-GND)
IC801 pin
RT
(TUNER OUT L-ch)
IC801 pin
XL
(TUNER VT)
19
36
18
1
CN801
3
1
