DOWNLOAD Sony ICF-C773 / ICF-C773L Service Manual ↓ Size: 1.16 MB | Pages: 29 in PDF or view online for FREE

Model
ICF-C773 ICF-C773L
Pages
29
Size
1.16 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
icf-c773-icf-c773l.pdf
Date
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ICF-C773/C773L
9
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
              AM FREQUENCY COVERAGE
ADJUSTMENT
  Frequency Display
530 kHz [531 kHz] 1,710 kHz [1,602 kHz]
  Reading on Digital voltmeter
2.9 
± 0.1 V
 9.5 
± 1.0V[9.4 ± 0.1V]
  Adjustment Part
L3
<confirmation>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4-1
CT2
580 kHz [621kHz]
1.490 kHz [1.404kHz]
MW IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
MW FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display
531 kHz
1.602 kHz
Reading on Digital voltmeter
2.75 
± 0.1 V
9.4 
± 1.0 V
Adjustment Part
L3
<confirmation>
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4-1
CT2
621 kHz
1.404 kHz
LW FREQUENCY COVERAGE
ADJUSTMENT
   Frequency Display
153 kHz
279 kHz
   Reading on Digital voltmeter
2.4 
± 0.3 V
9.0 
± 0.1 V
   Adjustment Part
<confirmation>
CT4
             LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4-2
CT3
162 kHz
243 kHz
• ICF-C773/C773L
FM FREQUENCY COVERAGE
           CONFIRMATION
Frequency Display
87.5 MHz
108 MHz
Reading on Digital voltmeter
3.1 
± 0.3 V
9.0 
± 1.0 V
Adjustment Part
<confirmation>
<confirmation>
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
87.5 MHz
108 MHz
SECTION 3
ELECTRICAL ADJUSTMENTS
<  > : ICF-C773L
TUNER SECTION     0 dB = 1 
µV
• FM Section
  Setting:
  BAND button:FM
Put the lead-wire
antenna close to
the set.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
• AM Section
  Setting:
  BAND  button: AM <MW and LW>
TP1 (ANT)
FM RF signal
generator
0.01 
µ
F
set
22.5 kHz frequency
deviation by 400 Hz signal
output level : as low as possible
• Connecting Level Meter (FM, AM<MW and LW>)
32 
Ω
SP+
SP–
level meter
(range 0.5-5V AC)
digital
voltmeter
100 k
Ω
TP8 (VT)
• Connecting Digital Voltmeter (FM, AM <MW and LW>)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
Adjustment and Connect Location: See page 10.
• ICF-C773
[   ] : 9kHz step
• ICF-C773L
ICF-C773/C773L
10
L1 : FM tracking
       adjustment
CT3  : LW
        tracking
       adjustment
L4-1 :  AM (MW)
       tracking
      adjustment
CT2 : AM (MW)
        tracking
       adjustment
MAIN BOARD    (Component Side)   
L3 : AM (MW)
        Frequency coverage
       adjustment
CT4 : LW
       Frequency coverage
       adjustment
CT1 : FM tracking
          adjustment
L4-2 :  LW tracking
      adjustment
T1 : AM (MW)
      IF adjustment
CT1
C43
C44
CF2
T1
BPF1
CF1
CF3
R22
R9
R18
R20
W1
R19
R6
R10
R16
R12
R104
R12
R14
R15
R125
D4
D3
L1
JC3
JC6
Q1
Q5
BCE
Q3
BCE
Q1
L2
C16
C17
C34
C39
C35
C41
C42
C37
C33
C36
C40
C18
C29
C134
C30
C27
C28
C26
C20
1
14
IC1
15
28
C773
AEP,I
TP8
(VT)
SP–
SP+
+
–
1
2
3
TP1
(ANT)
MAIN BOARD    (Conductor Side)   
SP+
SP–
TP8 (VT)
TP1 (ANT)
 Adjustment and Connect Location
ICF-C773/C773L
11
11
ICF-C773/C773L
SECTION 4
DIAGRAMS
4-1. PRINTED  WIRING  BOARD  – MAIN SECTION –
 : Uses unleaded solder.
J
L4
LW/MW
FERRITE-BAR
ANTENNA
L4
AM
FERRITE-BAR
ANTENNA
CT3
CT1
CT2
CT4
C43
C44
D103
X101
CF2
T1
BPF1
CF1
CF3
L101
R1
C773L
C773L
C773
C773
C773L
C773L
R2
R22
R9
R13
R7
R17
R18
R20
W1
R132
CN101
R124
R19
R6
R10
R117
R112
R111
R114
R113
R136
R119
R130
R131
R137
R139
R138
R116
R115
R11
R16
R12
R104
R129
R134
R133
R103
R110
R102
IC101
R135
R109
R118
R127
R122
R121
R120
R140
R128
R126
R123
R14
R15
R125
R101
D101
D102
D4
D3
L1
D5
D6
JC5
JC4
JC3
JC6
JC101
Q103
Q104
ECB
ECB
Q102
ECB
Q4
Q2
ECB
ECB
Q5
BCE
Q3
BCE
Q1
BCE
Q101
BCE
L2
C2
C1
C4
C46
C25
C16
C7
L3
L3
C5
C8
C12
C132
C118
C119
C122
C123
C125
C126
C127
C124
C138
C137
C120
C140
IC102
C139
C145
C128
C144
C104
C101
C105
C106
C114
C113
C112
C111
C115
C136
C135
C131 C130
C129
C110
C108
CN104
CN102
C117
C109
C116
C13
C14
C17
C3
CN103
C21
C34
C39
C35
C41
C42
C37
C47
C33
C36
C40
C18
C29
C134
C30
C27
C28
C142
C102
C26
C45
C20
C6
C9
R4
R5
11
(11)
1-865-813-
BOARD
MAIN  
1
14
IC1
15
28
43
42
14
15
28
29
1
1
56
SP1
SPEAKER
B
POWER
BOARD
C
KEY(MAIN)
BOARD
(Page 16)
A
KEY(R)
BOARD
(Page 16)
D
LCD
BOARD
(Page 16)
1
2
22
23
1
2
7
6
1
2
1
2
3
9
10
C773L
AEP,IT
US,CND,UK
C773
TP8
(VT)
SP–
SP+
+
–
4
5
8
1
2
3
(Page 18)
TP1
(ANT)
2
3
4
5
6
7
A
1
B
C
D
E
• See page 20 for Circuit Boards Location.
Ref. No.    Location
D3
B-2
D4
C-3
D5
A-3
D6
A-2
D101
D-5
D102
D-5
D103
D-5
IC1
D-3
IC101
C-6
IC102
D-6
Q1
A-4
Q2
B-4
Q3
C-3
Q4
B-4
Q5
E-3
Q101
C-4
Q102
C-4
Q103
B-6
Q104
B-6
• Semiconductor
Location
ICF-C773/C773L
12
12
ICF-C773/C773L
4-2. SCHEMATIC DIAGRAM  – MAIN BOARD (US/CND, IT) (1/2) –
• See page 21 for IC Block Diagram.
C37
R5
R4
R6
IC1
BPF1
CF1
CF2
T1
R19
R18
C34
C35
C42
C39
TP1
C33
R133
R14
CT1
L1
C16
R3
C46
C26
C27
R17
R11
R13
C21
CT2
C8
C7
C20
R10
L2
C18
R9
C17
C4
C30
R12
L3
C102
C142
R134
R135
R101
C128
C129
C130
C131
R122
C132
R123
R125
R124
C134
CN103
CN101
Q4
Q5
Q101
Q102
Q103
Q104
D3
D4
D101
D102
CF3
C43
R20
Q3
D103
R16
C6
R15
C40
C41
C28
C25
C5
JC4
JC101
JC6
C36
C29
JC3
R22
JC5
D6
C45
C44
C47
0.022
2.2M
100k
100k
CXA1019M
220
2.2k
0.01
4.7
50V
1
0.047
100p
100k
1k
1000p
2.2k
100p
0.01
0.1
1k
100k
220k
0.01
5p
10p
5p
22k
82nH
10p
4.7k
1000p
0.047
1
470
0.1
1000
6.3V
470k
470k
47
1000p
470p
0.1
0.22
10k
0.01
10k
100k
2.2k
220
25V
3P
7P
2SA1602-F
MUTE
SWITCH
DTC144EUA
BAND SELECT
SWITCH
2SC4154-F
L.P.F
2SC4154-F
L.P.F
DTC124EUA-T106
CE SWITCH
2SA1602-F
CE SWITCH
HVU202ATRU
HVU202ATRU
1SS355TE-17
1SS355TE-17
470
10V
0
2SC3931-C
RF BUFFER
RD5.1ESB2
47
220p
0
22
63V
1
0.1
47
35V
220p
0
0
0
10
50V
4.7
50V
0
0
0
SVC347S-TL-E
0.0022
220
10V
1
VDD
BUS
GND
L CONT
CE
LED+B
LIGHT3
BAND1
EQ
VCOH
NF
VCOL
MUTE
FM
TRACKING
ANTENNA
FERRITE-BAR
TRACKING
TP
(VT)
FREQUENCY
COVERAGE
SPEAKER
SP1
BOARD
POWER
L4
CT2,L4
L3
T1
+B
LED+B
VT
ANT
L CONT
LIGHT3
GND
BOARD
REG
VOL
GND
BOARD
MAIN
(2/2)
KEY(R)
CT1,L1
AM
AM
AM IF
AM
(Page17)
(Page13)
(Page19)
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