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HCD-EC68/EC78
QQ
3 7 63 1515 0
0 dB = 1 μV
TUNER SECTION
[AM]
Setting:
FUNCTION: AM
60 cm
loop antenna A loop antenna B
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
MAIN board
Output level: 54 dBuV
ANTENNA
CN801 pin
[FM]
Setting:
FUNCTION: FM
FM RF signal
MAIN board
generator
ANTENNA
CN801 pin
0.01 F
set
MAIN board
75kHz frequency
ANTENNA
deviation by 1K Hz
CN801 pin
signal
Output level: as low as possible
TE
(8dBuV)
L 13942296513
MAIN board
100 k Ω
IC801 pin
(TUNER VT)
• Repeat the procedures in each adjustment several times.
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.
20
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level meter
32 Ω
+
set
–
JACK board
PHONES jack (J492)
level meter
32 Ω
+
–
JACK board
PHONES jack (J492)
digital voltmeter
x
ao
y
i
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8
AM FREQUENCY COVERAGE ADJUSTMENT
(EC68: Mexican, Argentina, Australian/
EC78: Mexican, Argentina models)
Adjustment Part
L801
Confi rmation
AM FREQUENCY COVERAGE ADJUSTMENT
(Except EC68: Mexican, Argentina, Australian/
EC78: Mexican, Argentina models)
Adjustment Part
L801
Confi rmation
AM TRACKING ADJUSTMENT
(Except EC68: Mexican, Argentina, Australian/
EC78: Mexican, Argentina models)
Adjust for a maximum reading on level meter
L805
AM TRACKING ADJUSTMENT
(EC68: Mexican, Argentina, Australian/
EC78: Mexican, Argentina models)
Adjust for a maximum reading on level meter
L805
FM FREQUENCY COVERAGE ADJUSTMENT
Q Q
3
6 7
1 3
Adjustment Part
L803
Confi rmation
FM TRACKING ADJUSTMENT
Adjust for a minimum reading on level meter
L804
Adjustment Location: MAIN board (See page 21)
[FM DETECTOR ADJUSTMENT]
Setting:
FUNCTION: FM
FM RF signal
generator
Carrier frequency: 98MHz
Modulation:
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
u163
best in the vicinity of the maximum value where the tuner out
level becomes –15dBuV or more.
.
2 9
9 4
2 8
Reading on Digital
Frequency Display
Voltmeter
530 kHz
1.5 ± 0.1 V
1,710 kHz
8 ± 0.5 V
Reading on Digital
Frequency Display
Voltmeter
531 kHz
1.5 ± 0.1 V
1,602 kHz
7.2 ± 0.5 V
530 kHz
531 kHz
1 5
0 5
8
2 9
9 4
Reading on Digital
Frequency Display
Voltmeter
87.5 kHz
1.75 ± 0.1 V
108 kHz
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
MAIN board
JW801 (TUNER-GND)
ANTENNA
CN801 pin
m
co
9 9
2 8
9 9
+
–
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