Read Sony ICF-304 Service Manual online
1
Ver. 1.2 2005. 07
SERVICE MANUAL
E Model
Australian Model
ICF-304
SPECIFICATIONS
Frequency range:
Model for Europe
Band
Model for Europe
Band
ICF-304
FM
87.5 – 108 MHz
AM
526.5 – 1,606.5 kHz
Model for other countries/reglons
Band
Band
ICF-304
FM
87.5 – 108 MHz
AM
530 – 1,605 kHz
Speaker
Approx. 6.6 cm (2
5/8
inches) dia., 8
Ω
Output
v
(earphone) jack (
φ3.5 mm minijack)
Power output
100 mW (at 10 % harmonic distortion)
Power requirements
3 V DC, two R6 (size AA) batteries
Dimensions
Approx. 171.0
× 87.2 × 44.0 mm (w/h/d)
(6
3/4
× 3
1/2
× 1
3/4
inches)
incl. projecting parts and controls
Mass
Approx. 322 g (11.3 oz) incl. batteries
Design and specifications are subject to change without
notice.
notice.
Features
• Compact radio
• TUNE indicator for easy tuning
• TUNE indicator for easy tuning
Sony Corporation
Personal Audio Group
Published by Sony Engineering Corporation
9-879-524-03
2005G04-1
© 2005. 07
FM/AM RADIO
2
TABLE OF CONTENTS
1. GENERAL
Location of Control ................................................................. 3
2. DISASSEMBLY
2-1. Cabinet (Rear) Assy ............................................................ 4
2-2. Jack Board ........................................................................... 5
2-3. Chassis Assy ........................................................................ 5
2-4. Main Board ......................................................................... 6
2-5. Drum and Knob (Tune) Adjustment .................................... 6
2-6. Setting the Pointer ............................................................... 7
2-2. Jack Board ........................................................................... 5
2-3. Chassis Assy ........................................................................ 5
2-4. Main Board ......................................................................... 6
2-5. Drum and Knob (Tune) Adjustment .................................... 6
2-6. Setting the Pointer ............................................................... 7
3. ELECTRICAL ADJUSTMENTS
................................... 8
4. DIAGRAMS
4-1. Printed Wiring Boards ......................................................... 9
4-2. Schematic Diagram ........................................................... 10
4-2. Schematic Diagram ........................................................... 10
5. EXPLODED VIEWS
5-1. Cabinet Section ................................................................. 11
5-2. Main Board Section .......................................................... 12
5-2. Main Board Section .......................................................... 12
6. ELECTRICAL PARTS LIST
........................................ 13
ICF-304
Notes on Chip Component Replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
z
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher
• Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
also be added to ordinary solder.
3
ICF-304
SECTION 1
GENERAL
This section is extracted
from instruction manual.
from instruction manual.
• LOCATION OF CONTROL
ICF-304L
ICF-304
LW
FM
AM
FM
TUNING
V
OLUME
PO
WER
OFF
ON
A
B
Telescopic antenna
Antenne télescopique
Teleskopantenne
Antena telescópica
Telescoopantenne
Antenne télescopique
Teleskopantenne
Antena telescópica
Telescoopantenne
TUNE
FM
AM/LW
Installing the
Batteries
Batteries
(See fig.
A
- )
1
Open the battery compartment lid.
2
Insert two R6 (size AA) batteries (not
supplied) with correct polarity.
supplied) with correct polarity.
3
Close the lid.
Battery life
(Approx. hours)
(JEITA*)
When using
FM
AM
LW
Sony alkaline
95
110
110
LR6 (size AA)
Sony R6 (size AA)
35
38
38
* Measured by JEITA (Japan Electronics and
Information Technology Industries Association)
Standards. The actual battery life may vary
depending on the circumstance of the unit.
Standards. The actual battery life may vary
depending on the circumstance of the unit.
When to replace the batteries
When the sound becomes weak or distorted, replace
all batteries with new ones.
all batteries with new ones.
Notes on batteries
• Do not charge the dry batteries.
• Do not carry the dry batteries with coins or other
• Do not carry the dry batteries with coins or other
metallic objects. It can generate heat if the positive
and negative terminals of the batteries are
accidentally contacted by a metallic object.
and negative terminals of the batteries are
accidentally contacted by a metallic object.
• Do not use different types of batteries at the same
time.
• When you replace the batteries, replace all with new
ones.
• When you are not going to use the unit for a long
time, remove the batteries to avoid damage from
battery leakage and corrosion.
battery leakage and corrosion.
If the battery compartment lid
comes off (See fig.
comes off (See fig.
A
-
)
The battery compartment lid is designed to come off
when opened with excessive force. To put it back on,
see the illustration.
when opened with excessive force. To put it back on,
see the illustration.
1
Insert the right hook of the lid into the right
hole in the unit.
hole in the unit.
2
Hang the left hook on the left part of the
compartment where the lid fits.
compartment where the lid fits.
3
Slide the left hook towards the left hole in
the unit.
the unit.
Operating the
Radio
Radio
1
Set
POWER
switch to
ON
.
2
Select a desired band.
3
Tune in to a station using
TUNING
.
The
TUNE
indicator lights up when a station is
tuned in.
4
Adjust the volume using
VOLUME
.
To turn off the radio
Set
POWER
switch to
OFF
.
To listen with an earphone
Connect the earphone (not supplied) to the
v
v
(earphone) jack.
The speaker is deactivated when an earphone is
connected.
connected.
v
Insert the
E
side of the battery first.
Insérez le côte
E
de la pile en premier.
Zuerst die
E
Seite der Batterie einlegen.
Inserte en primer lugar el lado
E
de la pila.
Plaats eerst de
E
zijde van de batterij.
Rear
Arrière
Rückseite
Parte posterior
Achterkant
Arrière
Rückseite
Parte posterior
Achterkant
There is a tactile dot beside VOLUME to show the direction to
turn up the volume.
turn up the volume.
Un point tactile, situé à côté de la molette VOLUME, indique le
sens dans lequel il faut tourner pour augmenter le volume.
sens dans lequel il faut tourner pour augmenter le volume.
Neben VOLUME befindet sich ein fühlbarer Punkt. Dieser gibt
die Richtung an, in der man die Lautstärke erhöht.
die Richtung an, in der man die Lautstärke erhöht.
Al lado de la tecla VOLUME hay un punto táctil que muestra el
sentido para subir el volumen.
sentido para subir el volumen.
Naast de VOLUME regelaar bevindt zich een voelstip die de
richting aangeeft om het volume te verhogen.
richting aangeeft om het volume te verhogen.
R6 (size AA)
×
2 R6 (format AA)
×
2 R6 (Größe AA)
×
2
R6 (tmaño AA)
×
2 R6 (AA-formaat)
×
2
3
1
2
4
ICF-304
SECTION 2
DISASSEMBLY
Note : This set can be disassemble according to the following sequence.
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (REAR) ASSY
1
screw
(M 3
×
6 lock ace)
3
two screws
(+) BV tapping (B2.6)
9
contact plate (ANT)
0
cabinet (rear) assy
4
screw
(+) BV tapping (B2.6)
5
two claws
6
two claws
7
two claws
8
2
telescopic antenna
2-1.
CABINET (REAR) ASSY
(Page 4)
(Page 4)
2-2.
JACK BOARD
(Page 5)
(Page 5)
SET
2-3.
CHASSIS ASSY
(Page 5)
(Page 5)
2-4.
MAIN BOARD
(Page 6)
(Page 6)
2-5.
DRUM AND KNOB (TUNE) ADJUSTMENT
(Page 6)
(Page 6)
2-6.
SETTING THE POINTER
(Page 7)
(Page 7)
