Sony ICF-SW35 Service Manual

– 21 – – 22 –
GND
30
PLL LPF
29
NPX REG
28
VCO
27
FM DISCRI
26
MUTE
25
AM OSC
24
AFC
23
FM OSC
22
REG
21
FM RF
20
AM RF IN
19
FM RF IN
18
FE GND
17
FM/AM FE OUT
16
PLL LPF
1
PILOT DET
LPF1
2 3
PILOT DET
LPF2
ST IND/
VCO CHECK
4
RCH OUT
5
LCH OUT
6
VCC
7
RIPPLE
FILTER
8
AGC/AFC1
9
AGC/AFC2
10
GND
11
TUNE IND
12
FMIF IN
13
AMIF IN
14
BAND SELECT
15
FM FRONT-END
FM FRONT-END
FM IF/
DISCRI
AM IF/
DET
TUNING
INDICATOR
BAND PASS
MUTE
REG
AUTOBLEND
RIPPLE
FILTER
MUTING
MPX REG.VCO
1/2
COUNTER
1/2
COUNTER
DECORD AMP
MONO/ST
SELECT
PO2
PO1
IN1
IN2
NC NC
NF2
GND2
P-GND2
OUT2
RIPPLE
PRE+POWER1
PRE+POWER2
REG VOL
16
REG
15
VOL
14
NF1
13
GND1
12
P-GND1
11
OUT1
10
VCC
9
1 2 3 4 5 6 7 8
1 2 3 4
GND
OUT
NC
C
8 7 6
NC IN NC
5
NC
TRIGGER
CIRCUIT
REGULATOR
REFERENCE
ERROR
AMP
3
GND
1
OUT
2
VDD
VREF
1 2 3
VOUT
VIN
GND
VREF
IC1 CXA1238S
• IC Block Diagrams
IC2 CXA1522P
IC203 RN5RL27AA-TR
IC3 LA5002MTP1
IC204 R3111Q271A-TR
IC205 R3111Q331A-TR
SECTION 5
EXPLODED VIEW
NOTE:
• The mechanical parts with no reference
number in the exploded views are not supplied.
• Items marked “*” are not stocked since
they are seldom required for routine service.
Some delay should be anticipated
when ordering these items.
• Color Indication of Appearance Parts
Example :
KNOB, BALANCE (WHITE) ... (RED)
Parts Color Cabinet’s Color
Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark
1 3-042-909-01 BUTTON (+/–)
2 3-044-852-01 CUSHION (B)
3 3-042-907-01 BUTTON (POWER)
4 3-042-910-01 BUTTON (PAGE)
5 X-3378-376-1 CABINET (FRONT) ASSY
6 3-042-911-01 KNOB (N/F)
7 3-385-660-11 STRAP, HAND
8 3-389-575-01 SPRING (SPEAKER), WIRE
* 9 A-3683-159-A MAIN BOARD, COMPLETE
10 3-042-904-01 HOLDER (ANTENNA)
11 3-047-311-01 SPACER (T)
* 12 3-042-898-01 CASE (2ND B)
* 13 3-042-896-01 CASE (1ST A)
* 14 3-042-897-01 CASE (1ST B)
15 3-042-900-01 TERMINAL (–), BATTERY
16 7-685-649-79 SCREW +P 3X14 TYPE2 NON-SLIT
17 3-042-899-01 TERMINAL (+), BATTERY
18 3-383-877-01 PLATE (ANT), CONTACT
19 3-042-902-01 CABINET (REAR)
20 7-682-546-09 SCREW +P 3X5
21 3-893-839-21 STAND
22 3-042-903-01 LID, BATTERY CASE
23 3-312-059-11 CUSHION, BATTERY
24 3-042-916-01 FOOT, RUBBER
25 3-371-765-21 SCREW (2X8), +BTP
* 26 A-3663-471-A MICON BOARD, COMPLETE
27 3-042-908-01 KNOB (HOLD)
28 3-042-913-01 SHEET (LCD)
* 29 3-042-894-01 CASE (LCD)
30 3-042-906-01 HOLDER (LCD)
31 1-792-459-11 CABLE, FLAT (FFC) 18P
* 32 3-042-895-01 CASE (MICROCOMPUTER)
33 3-045-127-01 LEAF (MICRO COMPUTER), COPPER
34 3-044-853-01 SHEET (4 X 15)
35 3-045-971-01 LEAF (LCD), COPPER
ANT1 1-501-222-81 ANTENNA, TELESCOPIC (FM/SW)
ANT2 1-501-793-21 ANTENNA, FERRITE-ROD (MW/LW)
LCD201 1-803-943-11 DISPLAY PANEL, LIQUID CRYSTAL
SP1 1-529-645-11 SPEAKER (6.6cm)
RR
5-1. CABINET SECTION
1
2
3
4
5
6
7
8
9
10
13
15
12
14
16
17
18
19
20
16
16
21
22
23
24
25
25
26
27
11
28
29
34
30
35
31
32
33
SP1
ANT2
ANT1
LCD201
• Accessories and packing materials are given in
the last of this parts list.

Sony ICF-SW35 Specifications

General

Radio type	Portable
Tuner type	Digital
FM band range	87.5 - 108 MHz
Driver unit	66 mm
Number of built-in speakers	-
Display type	LED
Headphone outputs	1
Product color	Silver
Battery type	AA
Battery life (max)	33 h
Number of batteries supported	3
Dimensions (WxDxH)	168 x 35 x 106 mm

Weight and Dimensions

Weight	405 g

Summary

Specifications

Dimensions

Physical size of the radio unit.

Mass

Weight of the radio unit with batteries.

Supplied Accessories

Items included with the radio.

Power Requirements

Voltage and current needs for operation.

Battery Life

Estimated operational hours with different battery types.

Section 1 General

Operating the Radio

Instructions for turning on and using the radio.

Frequency Step Adjustment

Details on tuning increment adjustment.

FM Stereo Reception

How to enjoy stereo sound with headphones.

Listening Tone Settings

Adjusting tone for news or music.

MW Channel Step Setting

Changing the MW tuning step for different regions.

Tuning Functions

Scan Tuning Operation

How to automatically scan and find stations.

Attenuator Sensitivity Control

Adjusting reception sensitivity to control scan pauses.

Preset Station Management

Storing, tuning, and deleting favorite stations.

Advanced Functions

Memory Scan Tuning

Automatically scanning stations within a preset page.

Reception Improvement Techniques

Optimizing reception via antenna and external options.

Standby and Alarm Functions

Programming auto-on times and alarm features.

Sleep Timer Operation

Setting the radio to turn off automatically after a specified duration.

Control Lock and Display Light

Using the hold function to lock buttons and activating the display backlight.

Section 2 Disassembly

Cabinet Rear Disassembly

Procedure for removing the rear cabinet cover.

Main Board Disassembly

Steps to access and remove the main circuit board.

Section 2 Disassembly (continued)

Micon Board Disassembly

Procedure for removing the micon circuit board.

Section 3 Electrical Adjustments

FM Section Calibration

Calibration procedures for the FM tuning circuit.

SW/MW/LW Section Calibration

Calibration for shortwave, medium, and longwave bands.

Frequency Range and Tracking Checks

Verifying reception and tuning alignment across bands.

Section 3 Electrical Adjustments (continued)

FM VCO Adjustment Procedure

Calibrating the Voltage Controlled Oscillator for FM reception.

Section 4 Diagrams

IC Pin Description Details

Detailed pin assignments for integrated circuits.

Section 4 Diagrams (continued)

System Block Diagram Overview

Overview of the radio's internal functional blocks.

Section 4 Diagrams (continued)

Main Board Printed Wiring Layout

Visual guide to component placement on the main circuit board.

Section 4 Diagrams (continued)

Main Section Schematic Diagram

Detailed electrical wiring diagram for the main board.

Section 4 Diagrams (continued)

Micon Board Printed Wiring Layout

Visual guide to component placement on the micon circuit board.

Section 4 Diagrams (continued)

Micon Section Schematic Diagram

Detailed electrical wiring diagram for the micon board.

Section 5 Exploded View

Cabinet Section Components

Diagram showing the breakdown of the radio's cabinet parts.