Sony ICF-C723 / ICF-C723L Service Manual ▷ View online
– 11 –
– 12 –
ICF-C723/C723L
4-3. SCHEMATIC DIAGRAM (MICROCOMPUTER SECTION)
Note:
• 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.
•
U
: B+ Line.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : RADIO SECTION : FM,
no mark : RADIO SECTION : FM,
VOICE MEMO SECTION : PLAY
(
) : RADIO SECTION : AM (MW),
VOICE MEMO SECTION : REC
• 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.
• Abbreviation
AUS
: Australian
IT
: Italian
1
IC101
@¢
XOUT
r
WAVEFORM
1.8Vp-p
75kHz
VOLT/DIV : 0.5V AC
TIME/DIV : 5
TIME/DIV : 5
µ
sec
– 15 –
– 16 –
Note:
• 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.
Note:
Note:
The components identi-
Les composants identifiés
fied by mark
!
or dotted par une marque
!
sont cri-
line with mark
!
are cri-
tiques pour la sécurité.
tical for safety.
Ne les remplacer que par
Replace only with part
une piéce portant le
number specified.
numéro spécifié.
•
U
: B+ Line.
• Voltages are dc with respect to ground under no-signal
(detuned) conditions.
no mark : RADIO SECTION : FM,
no mark : RADIO SECTION : FM,
VOICE MEMO SECTION : PLAY
(
) : RADIO SECTION : AM (MW),
VOICE MEMO SECTION : REC
<
> : LW
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Signal path.
F
: FM
• Abbreviation
AUS
: Australian
IT
: Italian
4-5. SCHEMATIC DIAGRAM (MAIN SECTION)
ICF-C723/C723L
r
Refer to page 17 for IC Block Diagram.
– 17 –
IC1 CXA1019M
r
IC BLOCK DIAGRAM
FM FE
TUNING METER
AM IF DET AGC
AF POWER AMP
FM IF
FM/AM
IF OUT
FM RF IN
FE GND
NC
AM RF IN
FM RF
FM OSC
REG OUT
AFC
AM OSC
NF
VOL
FM DISCRI
GND
FM/AM BAND
SELECT
FM IF IN
AM IF IN
NC
METER
IF GND
DET OUT
AFC AGC
AFC AGC
AF IN
RIPPLE FILTER
AF OUT
VCC
GND
AM FE
FM
DISCRIMINATOR
14
13
12
11
10
9
8
7
2
1
6
5
3
4
15
16
17
18
19
20
21
22
23
24
25
26
27
28
– 18 –
SECTION 5
EXPLODED VIEW
NOTE :
• -XX, -X mean standardized parts, so they
may have some difference from the original
one.
one.
• Items marked “ * ”are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering
these items.
delay should be anticipated when ordering
these items.
• The mechanical parts with no reference
number in the exploded views are not
supplied.
supplied.
• Accessories and packing materials are given
in the last of this parts list.
Ref. No.
Part No.
Description
Remark
Ref. No.
Part No.
Description
Remark
• Abbreviation
AUS
: Australian
IT
: Italian
Les composants identifiés par une
marque
marque
! sont critiques pour la sécurité.
Ne les remplacer que par une pièce
portant le numéro spécifié.
portant le numéro spécifié.
The components identified by mark
!
or dotted line with mark
! are critical
for safety.
Replace only with part number specified.
Replace only with part number specified.
1
3-019-347-01 BUTTON (MAIN)
2
3-019-353-01 BUTTON (DST)
3
3-019-351-01 BUTTON (REC)
4
3-019-352-01 BUTTON (PLAY)
5
3-019-344-01 CABINET (UPPER)
6
3-019-348-01 BUTTON (SNOOZE)
* 7
3-019-357-01 CASE (LCD), SHIELD
8
3-019-350-01 REFLECTOR
9
3-019-360-01 CUSHION (MICROPHONE)
* 10
A-3679-953-A MAIN BOARD, COMPLETE (C723:US,Canadian)
* 10
A-3679-958-A MAIN BOARD, COMPLETE (C723:AEP,IT,E)
* 10
A-3679-959-A MAIN BOARD, COMPLETE (C723:AUS)
* 10
A-3679-961-A MAIN BOARD, COMPLETE (C723L:AEP)
10
A-3679-962-A MAIN BOARD, COMPLETE (C723L:UK)
11
3-019-346-01 HOLDER (TRANSFORMER)
12
3-019-359-01 SPACER (MICROPHONE)
13
3-382-175-21 KNOB (V)
! 14
1-555-795-00 CORD, POWER (C723:AEP,IT,E/ C723L:AEP)
! 14
1-696-572-21 CORD, POWER (C723L:UK)
! 14
1-765-458-11 CORD, POWER (C723:AUS)
! 14
1-769-339-22 CORD, POWER (C723:US,Canadian)
15
1-667-904-11 TRANSFORMER (PRIMARY) BOARD
16
1-667-905-11 TRANSFORMER (SECONDARY) BOARD
17
3-019-345-01 CABINET (LOWER) (C723:US,Canadian)
17
3-019-345-11 CABINET (LOWER) (C723:AEP,IT,AUS,E)
17
3-019-345-21 CABINET (LOWER) (C723L)
18
3-368-852-01 FOOT
19
2-532-810-00 CUSHION, 15X5X0.3
20
3-025-194-01 SHEET, BARREL
21
3-023-340-01 SHEET, BLIND
22
3-019-361-01 SHEET, ADHESIVE
23
3-019-349-01 PLATE, TRANSPARENT (C723)
23
3-019-349-11 PLATE, TRANSPARENT (C723L)
24
7-685-649-79 SCREW +P 3X14 TYPE2 NON-SLIT
ANT1
1-501-907-21 ANTENNA, FM WIRE
ECM101 1-542-168-11 MICROPHONE, ELECTRET CONDENSER
SP1
SP1
1-544-517-11 SPEAKER
! T201
1-450-922-11 TRANSFORMER, POWER (C723:US,Canadian)
! T201
1-450-923-31 TRANSFORMER, POWER
(C723:AEP,IT,AUS,E/ C723L)
LCD101 1-801-989-11 DISPLAY PANEL, LIQUID CRYSTAL
24
24
LCD
101
T201
ANT1
4
C
4
B
ECM101
SP1
24
1
2
3
4
5
6
23
22
8
7
10
11
12
13
14
US, Canadian model
AUS model
UK model
AEP, IT, E model
4
B
(including
4
A, B, C)
18
17
19
16
15
not supplied
20
21
9
14
14
14
4
A : MICROCOMPUTER board
4
B : MAIN board
4
C : KEY board
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