Read Sony ICF-C492 Service Manual online
SERVICE MANUAL
FM/AM CLOCK RADIO
E Model
Australian Model
SPECIFICATIONS
ICF-C492
Ver. 1.2 2007.02
9-879-414-03
2007B05-1
© 2007.02
© 2007.02
Sony Corporation
Personal Audio Division
Published by Sony Techno Create Corporation
Published by Sony Techno Create Corporation
Time display
Korean and Australia: 12-hour system
Other countries/regions: 24-hour system
Other countries/regions: 24-hour system
Frequency range
Band
Frequency range
FM
87.5-108 MHz
AM
530-1 710 kHz
Speaker
Approx. 6.6 cm ( 2
5
/
8
inches) dia. 8
Ω
Power output
120 mW (at 10 % harmonic distortion)
Power requirements
Korean: 220 V AC, 60 Hz
Australia: 240 V AC, 50 Hz
Other countries: 220-230 V AC, 50 Hz
For power backup: 9 V DC, one 6F22 battery
For power backup: 9 V DC, one 6F22 battery
Battery life
Approx. 20 hours (for clock backup) using Sony 006P
(6F22) battery
(6F22) battery
Dimensions
Approx. 198.7
× 101.5 × 109.7 mm (w/h/d)
(7
7
/
8
× 4 × 4
3
/
8
inches) not incl. projecting parts and
controls
Mass
Approx. 640 g (1 lb 6.58 oz) not incl. battery
Design and specifications are subject to change without
notice.
notice.
2
ICF-C492
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.
SECTION 1
SERVICING NOTES
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
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
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
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.
HOW TO CHANGED THE CERAMIC FILTERS
This model is used two same ceramic filters of CF2 and CF3.
You must use same type of color marked ceramic filters in order to
meet same specifications.
Therefore, the ceramic filter must be changed two pieces together
since it’s supply two pieces in one package as a spare parts.
You must use same type of color marked ceramic filters in order to
meet same specifications.
Therefore, the ceramic filter must be changed two pieces together
since it’s supply two pieces in one package as a spare parts.
Mark
Center frequency
red
10.70 MHz
blue
10.67 MHz
orange
10.73 MHz
black
10.64 MHz
white
10.76 MHz
CF2, 3
mark
TABLE OF CONTENTS
1.
SERVICING NOTES
...............................................
2
2.
GENERAL
...................................................................
3
3.
DISASSEMBLY
3-1.
Disassembly Flow ...........................................................
4
3-2.
Cabinet (Front) Assy .......................................................
4
3-3.
Cabinet (Rear) Sub Assy .................................................
5
3-4.
Main Board ......................................................................
5
3-5.
Pointer Setting .................................................................
6
4.
ELECTRICAL ADJUSTMENTS
.........................
7
5.
DIAGRAMS
5-1.
Printed Wiring Boards – MAIN Board – ........................ 10
5-2.
Printed Wiring Boards
– KEY/BUZZER/POWER Board– ................................. 11
– KEY/BUZZER/POWER Board– ................................. 11
5-3.
Schematic Diagram ......................................................... 12
6.
EXPLODED VIEWS
6-1.
Overall Section ................................................................ 14
6-2.
Chassis Assy Section ....................................................... 15
7.
ELECTRICAL PARTS LIST
................................ 16
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK
0
OR DOTTED LINE
WITH MARK
0
ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
3
ICF-C492
SECTION 2
GENERAL
This section is extracted from
instruction manual.
instruction manual.
SNOOZE
FAST
FAST
HOLD RADIO BUZZER CLOCK
TIME SET
ALARM TIME/CLOCK SET
ALARM MO
DE
ALARM
RESE
T
SLE
EP
OFF R
ADIO BU
ZZER RADIO
+BUZZER
RADIO ON
RADIO
OFF
TUNE
FM
AM
BAND
VOL
ALARM VOL
HIGH
LOW
BRIG
HTNE
SS
HIGH
LOW
PM
AM
BUZZER
RADIO
ALARM
AC power cord
Cordon d’alimentation
Cordon d’alimentation
secteur
FM wire antenna
Fil d’antenne FM
Fil d’antenne FM
*
There is a tactile dot beside VOL to show the direction to turn up the volume.
*
Un point tactile, situé à côté de la molette de VOL, indique le sens dans lequel il
faut tourner pour augmenter le volume.
faut tourner pour augmenter le volume.
Display window
*
(12-hour system)
Fenêtre d’affichage de l’heure
*
(Format de 12heures)
* The display differs depending on your country.
* L’affichage de l’heure diffère en fonction du pays d’achat.
* L’affichage de l’heure diffère en fonction du pays d’achat.
Location of Controls
ICF-C492
4
Note:
Follow the disassembly procedure in the numerical order given.
3-2. CABINET (FRONT) ASSY
• This set can be disassembled in the order shown below.
3-1. DISASSEMBLY FLOW
SECTION 3
DISASSEMBLY
2
screw (B2.6)
1
two caps (A)
4
two claws
5
cabinet (front) assy
knob (alarm)
S101
3
four screws
(B2.6)
(B2.6)
Note: When install the cabinet (front) assy,
adjust the knob (alarm) and S101.
3-2. CABINET (FRONT) ASSY
(Page 4)
3-3. CABINET (REAR) SUB ASSY
(Page 5)
3-4. MAIN BOARD
(Page 5)
3-5. POINTER SETTING
(Page 6)
SET
