Sony ICF-CD873 Service Manual ▷ View online
ICF-CD873
(11)
11
(11)
11
(11)
11
(11)
11
(11)
11
(11)
11
(12)
12
(11)
11
(11)
11
R482
C560
L403
C33
(US)
– 23 –
– 24 –
– 25 –
– 26 –
• Circuit Boards Location
MOTOR board
KEY board
MAIN board
LED board
POWER board
HEADPHONE board
VOLUME board
PUSH SWITCH board
6-4.
PRINTED WIRING BOARD – MAIN Section –
• Semiconductor Location
IC1
I-12
IC50
J-12
IC301
I-7
IC320
J-6
IC401
G-7
IC402
I-10
IC501
K-9
IC502
I-9
IC503
J-8
IC601
G-6
Q50
K-12
Q51
K-11
Q120
I-6
Q220
I-6
Q320
I-6
Q321
I-6
Q401
H-8
Q402
H-8
Q403
H-6
Q404
H-6
Q405
H-7
Q406
H-6
Q407
H-6
Q501
K-9
Q502
J-10
Q601
I-6
Q602
I-6
Ref. No.
Location
Ref. No.
Location
D1
K-12
D2
I-12
D3
I-12
D5
K-12
D320
I-6
D321
I-6
D401
H-11
D402
H-11
D403
H-12
D404
H-12
D405
H-13
D406
H-13
D407
H-13
D408
G-9
D409
G-9
D410
G-9
D411
G-9
D414
I-8
D415
H-8
D416
H-6
D417
H-6
D418
G-9
D419
G-16
D420
G-15
D421
G-14
D422
G-16
D423
G-15
D424
G-14
D501
I-8
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side)
the parts face are indicated.
• Abbreviation
AUS
: Australian model
CND : Canadian model
IT
IT
: Italian model
Note on Printed Wiring Boards:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
W
: indicates side identified with part number.
•
r
: Through hole.
•
¢
: internal component.
• b
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
ICF-CD873
(11)
11
(11)
11
(11)
11
(11)
11
(11)
11
(11)
11
(12)
12
(11)
11
(11)
11
R482
C560
L403
C33
(US)
– 23 –
– 24 –
– 25 –
– 26 –
• Circuit Boards Location
MOTOR board
KEY board
MAIN board
LED board
POWER board
HEADPHONE board
VOLUME board
PUSH SWITCH board
6-4.
PRINTED WIRING BOARD – MAIN Section –
• Semiconductor Location
IC1
I-12
IC50
J-12
IC301
I-7
IC320
J-6
IC401
G-7
IC402
I-10
IC501
K-9
IC502
I-9
IC503
J-8
IC601
G-6
Q50
K-12
Q51
K-11
Q120
I-6
Q220
I-6
Q320
I-6
Q321
I-6
Q401
H-8
Q402
H-8
Q403
H-6
Q404
H-6
Q405
H-7
Q406
H-6
Q407
H-6
Q501
K-9
Q502
J-10
Q601
I-6
Q602
I-6
Ref. No.
Location
Ref. No.
Location
D1
K-12
D2
I-12
D3
I-12
D5
K-12
D320
I-6
D321
I-6
D401
H-11
D402
H-11
D403
H-12
D404
H-12
D405
H-13
D406
H-13
D407
H-13
D408
G-9
D409
G-9
D410
G-9
D411
G-9
D414
I-8
D415
H-8
D416
H-6
D417
H-6
D418
G-9
D419
G-16
D420
G-15
D421
G-14
D422
G-16
D423
G-15
D424
G-14
D501
I-8
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Conductor Side)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Component Side)
the parts face are indicated.
• Abbreviation
AUS
: Australian model
CND : Canadian model
IT
IT
: Italian model
Note on Printed Wiring Boards:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
W
: indicates side identified with part number.
•
r
: Through hole.
•
¢
: internal component.
• b
: Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
ICF-CD873
– 27 –
– 28 –
– 29 –
– 30 –
6-5.
SCHEMATIC DIAGRAM – MAIN Section –
•
See page 31 for Waveforms.
•
See page 37 for IC Block Diagrams.
Note:
The components identi-
fied by mark
The components identi-
fied by mark
!
or dotted
line with mark
!
are criti-
cal for safety.
Replace only with part
number specified.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
Les composants identifiés par
une marque
!
sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
•
U
: B+ Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
(
no mark : FM
(
) : AM
[
] : CD PLAY
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
• Signal path.
F
: FM
f
: AM
J
: CD PLAY
• Abbreviation
AUS
: Australian model
CND : Canadian model
IT
IT
: Italian model
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
¢
: internal component.
•
C
: panel designation.
ICF-CD873
– 31 –
– 32 –
– 33 –
– 34 –
6-6.
SCHEMATIC DIAGRAM – POWER SUPPLY Section –
•
See page 40 for IC Block Diagram.
• Waveforms
– MAIN Board –
– MAIN Board –
1
IC601
2
(XT) (RADIO ON mode)
1 V/DIV, 100 ns/DIV
2
IC401
%•
(X1) (RADIO ON mode)
1 V/DIV, 100 ns/DIV
3
IC601
%∞
(XT1) (RADIO ON mode)
1 V/DIV, 10
µ
s/DIV
4
IC501
1
(FEO) (CD PLAY mode)
100 mV/DIV, 50 ns/DIV
5
IC501
!ª
(CLK), IC502
!¶
(CLK0)
(CD PLAY mode)
5 V/DIV, 10
5 V/DIV, 10
µ
s/DIV
6
IC501
@º
(XLT), IC502
!§
(XLT0)
(CD PLAY mode)
5 V/DIV, 200 ns/DIV
5 V/DIV, 200 ns/DIV
7
IC501
#¡
(RF O), IC502
#§
(RF)
(CD PLAY mode)
200 mV/DIV, 500 ns/DIV
200 mV/DIV, 500 ns/DIV
8
IC501
$™
(TEO) (CD PLAY mode)
100 mV/DIV, 500 ns/DIV
9
IC502
$™
LRCK (CD PLAY mode)
2 V/DIV, 10
µ
s/DIV
!º
IC502
$§
(BCK) (CD PLAY mode)
2 V/DIV, 200 ns/DIV
!¡
IC502
&£
(XTAI) (CD PLAY mode)
500 mV/DIV, 50 ns/DIV
!™
IC50
1
(XOUT) (RADIO ON mode)
500 mV/DIV, 10
µ
s/DIV
3.6 Vp-p
239 ns
3.7 Vp-p
238 ns
3.2 Vp-p
30.5
µ
s
Approx.
136 mVp-p
136 mVp-p
5.4 Vp-p
14.3
µ
s
5.2 Vp-p
102 ns
1.3
±
0.5 Vp-p
Approx.
144 mVp-p
144 mVp-p
5.3 Vp-p
22.8
µ
s
5.3 Vp-p
472 ns
1.4 Vp-p
59 ns
1.3 Vp-p
13.3
µ
s
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
5
: fusible resistor.
•
C
: panel designation.
•
U
: B+ Line.
• Voltages are dc with respect to ground under no-signal
conditions.
no mark : STANDBY
no mark : STANDBY
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Abbreviation
AUS
: Australian model
CND : Canadian model
IT
IT
: Italian model
Note:
The components identi-
fied by mark
The components identi-
fied by mark
!
or dotted
line with mark
!
are criti-
cal for safety.
Replace only with part
number specified.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
Les composants identifiés par
une marque
!
sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
Ne les remplacer que par une
piéce por tant le numéro
spécifié.
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