Sony HCD-EC68P Service Manual - Page 23

Adjustment Location, Setting, Procedure

Get Sony HCD-EC68P PDF manuals and user guides View all Sony HCD-EC68P manuals
Add to My Manuals
Save this manual to your list of manuals

Page 23 highlights

HCD-EC68P/EC78P AM FREQUENCY COVERAGE ADJUSTMENT (Except EC78P: UK model) Adjustment Part Frequency Display Reading on Digital Voltmeter L801 530 kHz 1.5 ± 0.1 V Confirmation 1,710 kHz 8 ± 0.5 V AM FREQUENCY COVERAGE ADJUSTMENT (EC78P: UK model) Adjustment Part Frequency Display Reading on Digital Voltmeter L801 531 kHz 1.5 ± 0.1 V Confirmation 1,602 kHz 7.2 ± 0.5 V AM TRACKING ADJUSTMENT (Except EC78P: UK model) Adjust for a maximum reading on level meter L805 530 kHz AM TRACKING ADJUSTMENT (EC78P: UK model) 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 Confirmation 108 kHz 6.2 ± 0.5 V FM TRACKING ADJUSTMENT Adjust for a minimum reading on level meter L804 98 MHz FM AUTO STOP CHECK SET generator + 75 Ω 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. Confirm that input Frequency of A, B and C detected and automatic scanning stops. The stop of automatic scanning means "The station signal is received in good condition". Adjustment Location: MAIN board (See page 24) FM DETECTOR ADJUSTMENT Setting: FUNCTION: FM FM RF signal generator MAIN board ANTENNA CN801 pin  MAIN board IC801 pin RT (TUNER OUT L-ch) level meter Carrier frequency: 98MHz Modulation: deviation by FM 75 kHz Output level: 60 dBuV set + - MAIN board MAIN board JW801 (TUNER-GND) ANTENNA 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 -15dBuV or more. 23

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
HCD-EC68P/EC78P
23
AM
FREQUENCY
COVERAGE
ADJUSTMENT
(Except EC78P: UK model)
Adjustment Part
Frequency Display
Reading on Digital
Voltmeter
L801
530 kHz
1.5 ± 0.1 V
Con
fi
rmation
1,710 kHz
8 ± 0.5 V
AM
FREQUENCY
COVERAGE
ADJUSTMENT
(EC78P: UK model)
Adjustment Part
Frequency Display
Reading on Digital
Voltmeter
L801
531 kHz
1.5 ± 0.1 V
Con
fi
rmation
1,602 kHz
7.2 ± 0.5 V
AM
TRACKING
ADJUSTMENT
(Except EC78P: UK model)
Adjust for a maximum reading on level meter
L805
530 kHz
AM
TRACKING
ADJUSTMENT
(EC78P: UK model)
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
Con
fi
rmation
108 kHz
6.2 ± 0.5 V
FM
TRACKING
ADJUSTMENT
Adjust for a minimum reading on level meter
L804
98 MHz
Adjustment Location:
MAIN board (See page 24)
FM
DETECTOR
ADJUSTMENT
Setting:
FUNCTION: FM
FM RF signal
generator
Carrier frequency: 98MHz
Modulation:
deviation by FM 75 kHz
Output level: 60 dBuV
+
–
level meter
MAIN board
JW801 (TUNER-GND)
MAIN board
IC801 pin
(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
best in the vicinity of the maximum value where the tuner out
level becomes –15dBuV 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 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. 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”.