Sony ICF-703S Service Manual ▷ View online
– 5 –
2-3. MAIN BOARD, LED BOARD
2-4. SETTING THE POINTER
1
knob (control)
7
BTP 3x10
8
BTP 3x10
9
claws
qa
MAIN board
5
BTP 2.6x5
6
LED board
2
knob (band)
3
chassis
0
4
Removal the solder.
1
rack (pointer)
rack (pointer)
2
pointer
• Setting the Pointer
A
1. Turn the Knob (Tuning) in the direction of
A
until it is stopped.
2. Place the rack as shown in the figure.
3. Mount the pointer.
3. Mount the pointer.
– 6 –
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
AM RF signal
generator
generator
400Hz, 30%
AM modulation
Output level: as low as possible
AM modulation
Output level: as low as possible
• 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.
SW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L7
5.8 MHz
CT6
18.5 MHz
SW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L6
5.8 MHz
CT5
18.5 MHz
SECTION 3
ELECTRICAL ADJUSTMENTS
SW SECTION
BAND switch : SW
telescopic
antenna terminal
antenna terminal
12pF
AM RF signal
generator
generator
400Hz, 30%
AM modulation
Output level: as low as possible
AM modulation
Output level: as low as possible
set
16
Ω
set
v
jack (EPJ1)
level meter
• 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.
MW IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
455 kHz
MW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L5
520 kHz
CT1-4
1,650 kHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
600 kHz
CT1-1
1,400 kHz
MW SECTION
BAND switch : MW
16
Ω
set
v
jack (EPJ1)
level meter
telescopic
antenna terminal
antenna terminal
0.01
µ
F
FM RF signal
generator
generator
22.5kHz frequency deviation
by 400Hz signal
Output level: as low as possible
by 400Hz signal
Output level: as low as possible
set
16
Ω
set
v
jack (EPJ1)
level meter
– 7 –
– 8 –
• 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.
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L4
86.5 MHz
CT1-3
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L8, L9
86.5 MHz
CT1-2
109.5 MHz
Adjustment Location: MAIN BOARD
FM SECTION
BAND switch : FM
CT5
SW
TRACKING
ADJUSTMENT
L6
SW
TRACKING
ADJUSTMENT
CT1-4
MW
FREQUENCY
COVERAGE
ADJUSTMENT
L4
FM
FREQUENCY
COVERAGE
ADJUSTMENT
CT1-1
MW
TRACKING
ADJUSTMENT
L8,9
FM
TRACKING
ADJUSTMENT
T1
MW
IF
ADJUSTMENT
CT1-2
FM
TRACKING
ADJUSTMENT
CT1-3
FM
FREQUENCY
COVERAGE
ADJUSTMENT
L5
MW
FREQUENCY
COVERAGE
ADJUSTMENT
– MAIN BOARD (COMPONENT SIDE) –
L7
SW
FREQUENCY
COVERAGE
ADJUSTMENT
CT6
SW
FREQUENCY
COVERAGE
ADJUSTMENT
L1
MW
TRACKING
ADJUSTMENT
1
A
B
C
D
E
F
G
H
I
J
2
3
4
5
6
7
8
9
10
11
12
13
14
IC1
D401
D402
JC7
Q5
C403
C404
C401
R401
R402
R302
D301
R301
JC9
C18
C19
JC8
C12
C20
C9
C3
C4
R12
C16
C17
C25
C24
R13
C23
C8
R10
R1
L12
C26
C38
L11
C37
L10
JC4
JC402
JC3
JC6
JC5
E
C
B
Q2
B
C
E
Q1
B
C
E
Q3
B
C
E
Q4
B
C
E
D1
TP5
TP3
CF3
CF2
TP1
BPF1
CF4
C10
TP2
TP13
C7
TP9
TP11
TP10
TP8
TP7
TP6
TP12
C14
C21
C22
C15
C13
CF1
TP404
TP406 TP405
TP402
TP403
TP311
TP310
04
MAIN BOARD
POWER BOARD
LED BOARD
L5
MW OSC
L4
FM OSC
T1
IFT
RV2
TONE
RV1
VOL
VOL
S1
(BAND)
SW/K MW/M FM/U
T401
POWER
TRANSFOMER
C406
TP401
S401
CN401
1-677-384-
1-677-383-
1-677-382-
(11)
11
(11)
11
(11)
11
1
5
CT6
C6
C41
L7
SW OSC
L6
SW ANT
CT5
CV1
TUNING
ANT1
FM/SW
TELESCOPIC
ANTENNA
C40
C5
1
15
1
3
16
30
BLK/WHT
BLK
L8
L9
CT1-2
CT1-3
CT1-4
CT1-1
-2
-3
-4
-1
ACJ1
~ AC IN
EPJ1
v
S401
OPERATION
ON
STANDBY
DRY BATTERY
SIZE " D "
(IEC DESIGNATION R20)
3PCS, 4.5V
C402
SP1
SPEAKER
BLK
BLK
BLK/WHT
BRN
D301
TUNE
BLK
BLK/WHT
BLK
RED
CLEAR
L1
MW
FERRITE-ROD
ANTENNA
-3
-2
-5
-6
-1
-4
CLEAR
RED
BLK
L401
ICF-703S
– 9 –
– 10 –
4-1. PRINTED WIRING BOARDS
Note:
• X
: parts extracted from the component side.
• Y
: parts extracted from the conductor side.
•
W
: indicates side identified with part number.
•
f
: internal component.
• b
: Pattern from the side which enables seeing.
SECTION 4
DIAGRAMS
D1
F-9
D301
H-3
D401
D-4
D402
D-4
IC1
C-11
Q1
B-11
Q2
B-10
Q3
B-10
Q4
B-10
Q5
B-10
• Semiconductor
Location
Ref. No.
Location
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