Sony ICF-C723 / ICF-C723L Service Manual ▷ View online
– 5 –
INSTALLATION POWER CORD
2-3. MAIN BOARD, KEY BOARD, TRANSFORMER (PRIMARY) BOARD,
TRANSFORMER (SECONDARY) BOARD, REMOVAL
TRANSFORMER (SECONDARY) BOARD, REMOVAL
6
Claw
6
Claw
4
Claw
8
Transformer (primary) board
9
Transformer (secondary) board
4
Claw
4
Claw
1
Screws +P (3x14)
3
CN1
2
5
7
Power transformer (T201)
Shield case (transformer)
Main board
Cabinet (lower)
Key board
power cord
power cord
Cabinet (lower)
Cabinet (lower)
US model
EXCEPT US model
– 6 –
AM Section
Band button : AM (ICF-C723)
: MW or LW (ICF-C723L)
Volume
: MAX
FM Section
Band button : FM
Volume
Volume
: MAX
[MAIN BOARD] (Conductor side)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
( ) : AEP, UK, Italian, Australian, E model only
AM IF ALIGNMENT
Adjust for a maximum reading on level meter.
T1
455kHz
AM <MW> FREQUENCY COVERAGE ADJUSTMENT
Adjust parts
Frequecy display
Reading on digital
voltmeter
L6
530kHz (531kHz)
2.5 ± 0.1V (ICF-C723)
2.65 ± 0.1V (ICF-C723L)
Less than 11.0V
confirmation
1,710kHz (1,602kHz)
Standard 9.5V
(Less than 10.0V)
(Standard 9.0V)
AM <MW> TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 :ICF-C723
L3–1 :ICF-C723L
580kHz
(621kHz)
CT1
1,490kHz
(1,404kHz)
ICF-C723L
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust parts
Frequecy display
Reading on digital
voltmeter
confirmation
153kHz
More than 2.2V
(Standard 3V)
CT4
279kHz
9.0 ± 0.1V
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 – 2
162kHz
CT2
243kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust parts
Frequecy display
Reading on digital
voltmeter
L5
87.5MHz
3.0 ± 0.1V
confirmation
108.0MHz
10 ± 1V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
87.5MHz
CT3
108MHz
Adjustment Location : Main board (See page 8)
FM RF signal
generator
generator
22.5kHz frequency
deviation by 400Hz signal.
Output level :
as low as possible
deviation by 400Hz signal.
Output level :
as low as possible
set
FM ANT IN
0.01 F
µ
set
8
Ω
speaker terminal
level meter
SECTION 3
ELECTRICAL ADJUSTMENTS
AM RF signal
generator
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
W705
JW13
C15
C55
1
2
3
4
5
6
digital
voltmeter
– 7 –
Adjustment Location :
ICF-C723
ICF-C723L
L6 : AM Frequency Coverage Adjustment
L5 : FM Frequency Coverage Adjustment
CT1 : AMTracking Adjustment
L4 : FM Tracking Adjustment
CT3 : FM Tracking Adjustment
T1: AM IF Alignment
L3 : AM Tracking Adjustment
[MAIN BOARD]
(Component side)
(Component side)
L6 : MW Frequency Coverage Adjustment
CT4 : LW Frequency Coverage Adjustment
L5 : FM Frequency Coverage Adjustment
CT1 : MW Tracking Adjustment
L3–2 : LW Tracking
Adjustment
Adjustment
L4 : FM Tracking Adjustment
CT3 : FM Tracking Adjustment
T1: AM IF Alignment
L3–1 : MW Tracking Adjustment
CT2 : LW Tracking Adjustment
[MAIN BOARD]
(Component side)
(Component side)
– 8 –
Pin No.
Pin name
I/O
Description
1
INIT
O
Destination select terminal.
2
PLAY OUT VOL
–
Not used (Open).
3
POWER
O
Mute drive output.
4
R MUTE
O
REC Mute drive output.
5
PLAY
O
Voice memo play control output.
6 – 9
KS0 – 3
I
Key input.
10 – 13
KS0 – 3
I
Key input.
14
BAND 1
O
FM/AM band select.
15
BAND 2
O
MW/LW band select.
16
VAMP
I
MIC input.
17
REC
O
Voice memo REC control output.
18
GND
–
Ground.
19
EO
O
Tuning voltage control output.
20
VCOL
I
VCO (MF, HF) input terminal.
21
VCOH
I
VCO (VHF) input terminal.
22
VREG 1
–
Capacitor connect terminal.
23
VDD
–
Power supply.
24
X OUT
O
System clock output (75MHz).
25
X IN
I
System clock input (75MHz).
26
VREG 2
–
Capacitor connect terminal.
27
VLCD 0
I
LCD drive device voltage input.
28
CAP 0
–
Capacitor connect terminal.
29
CAP 1
–
Capacitor connect terminal.
30
LCD 1
I
LCD drive device voltage input.
31 – 34
COM 0 – 3
O
LCD common output.
35 – 48
LCD 0 – 13
O
LCD segment output.
49
LCD14
–
Not used (Open).
50
CF
I
Chip enable input.
51
INT
–
Not used (Fixed at “L”).
52
BEEP
O
Beep signal output.
53
EON IN
I
REC signal input.
54
PB 1
I
Destination select terminal.
55
PB 2
I
Destination select terminal.
56
PB 3
I
Destination select terminal.
SECTION 4
DIAGRAMS
4-1. EXPLANATION OF IC TERMINALS
IC101
µ
PD17071GB-522-1A7 (SYSTEM CONTROL)
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