Sony ICF-SW35 User manual

– 1 –
SERVICE MANUAL
US Model
Canadian Model
AEP Model
E Model
ICF-SW35
FM STEREO/SW/MW/LW
PLL SYNTHESIZED RECEIVER
Circuit system
FM: Super heterodyne
LW/MW/SW: Dual conversion super heterodyne
Frequency range
FM: 76.00 - 108.00 MHz
87.50 - 108.00 MHz*1
SW: 2250 - 26100 kHz*2
3850 - 26100 kHz*3
MW: 530 - 1710 kHz
530 - 1620 kHz
LW: 150 - 285 kHz
Speaker
Approx. 66 mm (2 1/8 in.) diameter, 8 Ohms
Maximum output
240 mW (at 10 % harmonic distortion)
Output
i(headphones) jack (ø3.5 mm stereo mini jack)
16 Ohms
Power requirements
DC 4.5 V, three R6 (size AA) batteries
External power source
DC IN 4.5 V
Battery Life (approximate hours)
Sony R6 Sony LR6
(size AA) alkaline
(size AA)
FM reception 17 46
SW reception 12 33
LW/MW reception 12 33
SPECIFICATIONS
Dimensions
Approx. 168 ×106 ×35 mm (W ×H ×D)
(6 5/8 ×4 1/4 ×1 7/16 in.) incl. projecting parts
Mass
Approx. 405 g (14.3 oz) incl. batteries
Supplied Accessories
Carrying case (1)
Short wave guide (1)
Design and specifications are subject to change without
notice.
TheAC power adaptor’s operating voltage varies
depending upon the country in which it is sold.
Buy theAC power adaptor in the country you intend
to use it.
Your Sony dealer may not handle all of the above listed
optional accessories. Please ask your dealer for detailed
information on the optional accessories available in your
country.
*1Italy, Saudi Arabia and Malaysia
*2Countries except for Italy
*3Italy only
Ver 1.0 2000. 03

– 2 –
Notes on Chip Component Replacement
•Never reuse a disconnected chip component.
•Notice that the minus side of a tantalum capacitor may be
damaged by heat.
TABLE OF CONTENTS
1. GENERAL
Operating the Radio................................................................. 3
Setting the Standby Time ........................................................ 5
Setting the Sleep Timer ........................................................... 5
Using Other Functions............................................................. 5
2. DISASSEMBLY
2-1. Cabinet (Rear) ..................................................................... 6
2-2. Main Board ......................................................................... 6
2-3. Micon Board ....................................................................... 7
3. ELECTRICAL ADJUSTMENTS
FM Section .............................................................................. 8
SW/MW/LW Section............................................................... 8
FM VCO Adjustment............................................................... 9
4. DIAGRAMS
4-1. IC Pin Description............................................................. 10
4-2. Block Diagram .................................................................. 11
4-3. Printed Wiring Board – Main Section – ............................ 13
4-4. Schematic Diagram – Main Section –............................... 15
4-5. Printed Wiring Board – Micon Section – .......................... 17
4-6. Schematic Diagram – Micon Section –............................. 19
5. EXPLODEDVIEW
5-1. Cabinet Section ................................................................. 22
6. ELECTRICAL PARTS LIST......................................... 23

–3 –
SECTION 1
GENERAL This section is extracted
from instruction manual.

–4 –

–5 –

–6 –
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (REAR)
2-2. MAIN BOARD
SECTION 2
DISASSEMBLY
1P 3x14
5cabinet (rear)
2P 3x14
4claw
3claws
2P 3x14
1Removal the solder.
6MAIN board
5CN1
3claw
4claw

–7 –
2-3. MICON BOARD
1BTP 2x8
2BTP 2x8
3MICON board

–8 –
FM SECTION 0 dB = 1 µV
Setting:
BAND switch: FM
VOLUME: MAX
ATT: OFF
TONE: MUSIC
SECTION 3
ELECTRICAL ADJUSTMENTS
telescopic
antenna terminal
0.01µF
FM RF signal
generator
400Hz, 30% FM modulation
frequency deviation ±22.5kHz
Output level: as low as possible
set
SW/MW/LW SECTION
Setting:
BAND switch: SW or MW or LW
VOLUME: MAX
ATT: OFF
TONE: MUSIC
(SW)
telescopic
antenna terminal
10µF
AM RF signal
generator
400Hz, 30%
AM modulation
Output level: as low as possible
set
(MW/LW)
• Connecting Level Meter (FM, SW, MW and LW)
Put the lead-wire
antenna close to
the set.
AM RF signal
generator
400Hz, 30%
AM modulation
Output level: as low as possible
ijack (J1)
set
16 Ω
level meter
(range: 0.5–5 V ac
)
• Connecting DigitalVoltmeter (FM, SW, 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.
digital
voltmeter
TP
(VT)
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
Frequency Display 11,800 kHz
Adjustment Part T1, T4
LW FREQUENCY COVERAGE
CHECK
Frequency Display 150 kHz
Reading on Digital voltmeter 1.0 - 1.3 V
Adjustment Part <confirmation>
SW FREQUENCY COVERAGE
CHECK
Frequency Display 26,100 kHz
Reading on Digital voltmeter 8.0 - 9.0 V
Adjustment Part <confirmation>
FM FREQUENCY COVERAGE
CHECK
Frequency Display 76 MHz 108 MHz
Reading on Digital voltmeter 2.8 - 4.0 V 9.5 - 11.0 V
Adjustment Part <confirmation> <confirmation>
FMTRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
Frequency Display 76 MHz 108 MHz
Adjustment Part L11 CT1
Adjustment Location: See page 9.

–9 –
C70
JC8
C66
C59
C67
C62
C54
L
8
L12
D10
L9
L10
D7
D5
D3
L7 JC3
L3
L4
D6
D11
L17
C2
C45
C55
C60
C65
C68
C73R56 R85 C56
R53
R46
C47
C49
C53
C52
L16
X1
L15
R59
R55
R38
R35
R52
R43
R49
R50 R48
R45
C44
C39
C17 C21
R
1
R1
R9
R33
C35
R37
C32
R30
R25R23
C18
R10 C16
R11 R5
R26 R7
R6
R4
C19
R47
C46
C36
R54
R63
R62
R60
R61
C51
R51
C50
L14
D9
JC18
JC7
R42
R34
C48
R17 C22
C20
R44
C40 R14
R15 C12
L6 L5
C10
C29
T2
C31
C8
C5
C7
R74
C28
C30
C9
C27
R24
C93
C90
C100
IC3
R75
C92
JW15 JW16 JW13
JW11
JW3
JW4
JW12
C91
D12
JC16
JC4
JC6
JC5
JC19 JC17
C26
R22
C25
C11
R8
C14
C13
C15
C38
C37
R36 C34
R29 C33
R28
R32
R31
C43
C42
Q20
R41
R40 R39
C89
TP
(D-D OUT)
TP(10.25)
TP
(GND)
TP
(LCH)
TP
(B/R)
TP
(BEEP)
R65
R83
R64
JC11
JW7
JW5
C74 CF4 C57
C41
C58
RV2
JW8
JW10
Q
6
Q23
Q24
Q19
Q5
Q17
Q4
Q3
Q8
Q7
Q11
Q12
Q15
Q9
Q13
Q29
Q28 Q10
Q14
Q36
Q35
D8
Q18
D4
B
EC
B
EC
B
EC
B
E
C
B
E
C
B
1
1
2
5
6
9
10
15
17
16
18 4
8
5
E
C
B
EC
G
DS
B
E
B
B
BE
EC
C
B
E
C
B
B
E
C
G
1
15
1
5
10
16
20
25
30
3
2
C
S
D
D
S
G
G
D
S
CN1
B
E
C
B
EB
E
B
C
C
C
B
E
C
L11
L13
CT1
BPF1
TP
(GND)
IC1
CF2
C64
TP
(VT)
T3 S
G
B
EC
D
TP
(VCOL) TP
(H/L)
TP
(VCOH) MW/
L
TP
(POWER)
TP(RF GND)
TP
(AGC)
R
TP
(VT)
–main board (conductor side) –
FM VCO ADJUSTMENT • Connecting Frequency counter
telescopic
antenna terminal
0.01µF
FM RF signal
generator
98MHz, non-modulation
Output level: 0.1v(100dB)
set
33 kΩ
frequency
counter
1µF/50V
IC1 pin
7
IC1 pin
4
FM VCO ADJUSTMENT
Reading on Frequency counter 76 kHz ± 200 Hz
Adjustment Part RV2
Adjustment Location:
TP
(VT)
IC1
IC3
IC2
1
1
17
2
18
4
8
4
1
8
5
1
8
1516
16
9
30
CN1
GB
R
N
J1
S1
T1 T4
S2
RV2
L11 CT1
ANT1
FM/SW
TELESCOPIC
ANTENNA
ANT2
MW/LW
FERRITE-ROD
ANTENNA
(CONDUCTOR SIDE)
FM TRACKING ADJUSTMENT AM IF ADJUSTMEN
T
FM VCO ADJUSTMENT
–main board (component side) –

–10 –
SECTION 4
DIAGRAMS
4-1. IC PIN DESCRIPTION
•IC201 uPD17072GB-017-1A7 (SYSTEM CONTROL,LCD DRIVER)
Pin No. Pin Name I/O Pin Description
1 CS O EEPROM CS control output
2 POWER O Power supply (for signal ) start output H: Radio ON L: Radio OFF
3 BAR/ROD O Antenna switch output H: BARANTENNA L: ROD ANTENNA
4 MUTE O MUTE output H: MUTE OFF L: MUTE ON
5 AM/FM O Band switch signal output H: SW, MW, LW L: FM
6 –9 KS0 –3 O Key source output
10 –13 KR0 –3 I Key return input
14 INITIAL O 9K/10K read output
15 NORMAL/FINE I Frequency step switch input H: FINE L: NORMAL
16 H/L O SW filter switch signal output H: SW L: FM, MW. LW
17 10.25 O Attenator output
18 GND —GND
19 EO O Tuner PLL error output
20 VCOL (LW/MW/SW) I VCO (SW/MW/LW band) input
21 VCOH (FM) I VCO (FM band) input
22 REG0 —Capacitor terminal (regulator circuit)
23 VDD —Power supply terminal (+2.7 V)
24 XOUT O Oscillation output (75 kHz)
25 XIN I Oscillation input (75 kHz)
26 REG1 —Capacitor terminal (regulator circuit)
27 REGLCD0 —LCD driving power supply terminal
28, 29 CAPLCD0, 1 —LCD driving power supply terminal
30 REGLCD1 —LCD driving power supply terminal
31 –34 COM0 –3 O LCD drive common output
35 –49 LCD0 –14 O LCD drive segment output
50, 51 VDET1, 2 I Reducing voltage information input
52 BEEP O Beep output
53 TUNE I Receive information input
54 HOLD I Hold input
55 SCK O Serial clock output
56 DI/DO I/O Serial data input/output