ICF-C470, ICF-C470L - Sony Audio Service Manual (repair manual)

icf-c470, icf-c470l service manual
Model
ICF-C470 ICF-C470L
Pages
21
Size
2.11 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
icf-c470-icf-c470l.pdf
Date

Read Sony ICF-C470 / ICF-C470L Service Manual online

MICROFILM
SERVICE MANUAL
ICF-C470
FM/AM CLOCK RADIO
ICF-C470L
FM/MW/LW 3 BAND CLOCK RADIO
US Model
Canadian Model
E Model
Australian Model
ICF-C470
AEP Model
ICF-C470/C470L
UK Model
ICF-C470L
SPECIFICATIONS
ICF-C470/C470L
Photo: ICF-C470
Ver 1.1  1999. 06
With SUPPLEMENT 1
(9-926-981-81)
– 2 –
TABLE  OF  CONTENTS
1.
GENERAL
...................................................................
3
2.
DISASSEMBLY
.........................................................
4
3.
DIAL POINTER SETTING
.....................................
5
4.
POWER CORD SETTING
.....................................
6
5.
ELECTRICAL ADJUSTMENTS
..........................
7
6.
DIAGRAMS
6-1. Block Diagram ................................................................
9
6-2. Printed Wiring Boards (ICF-C470) ................................ 11
6-3. Schematic Diagram (ICF-C470) ..................................... 13
6-4. Printed Wiring Boards (ICF-C470L) .............................. 15
6-5. Schematic Diagram (ICF-C470L) .................................. 17
7.
EXPLODED  VIEWS
................................................ 20
8.
ELECTRICAL  PARTS  LIST
............................... 22
ATTENTION  AU  COMPOSANT  AYANT  RAPPORT
À  LA  SÉCURITÉ!
LES  COMPOSANTS  IDENTIFIÉS  PAR  UNE  MARQUE  
!
SUR  LES  DIAGRAMMES  SCHÉMATIQUES  ET  LA  LISTE
DES  PIÈCES  SONT  CRITIQUES  POUR  LA  SÉCURITÉ
DE  FONCTIONNEMENT.  NE  REMPLACER  CES  COM-
POSANTS  QUE  PAR  DES  PIÈCES  SONY  DONT  LES
NUMÉROS  SONT  DONNÉS  DANS  CE  MANUEL  OU
DANS  LES  SUPPLÉMENTS  PUBLIÉS  PAR  SONY.
SAFETY-RELATED  COMPONENT  WARNING!!
COMPONENTS  IDENTIFIED  BY  MARK  
!
  OR  DOTTED
LINE  WITH  MARK  
!
  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  PUB-
LISHED  BY  SONY.
HOW  TO  CHANGED  THE  CERAMIC  FILTERS
This model is used two ceramic filters of CF2 and CF3.
You must used same type of color marked ceramic filters in order
to meet same specifications.
Therefore, the ceramic filter must changed two pieces together
since it’s supply two pieces in one package as a spare parts.
CF2
CF3
mark
Mark
Center frequency
red
10.70 MHz
blue
10.67 MHz
orange
10.73 MHz
black
10.64 MHz
white
10.76 MHz
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
SAFETY  CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.
LEAKAGE  TEST
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able.  (See Fig. A)
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
0.15 
µ
F
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
– 3 –
SECTION  1
GENERAL
This section is extracted from
instruction manual.
– 4 –
CABINET  (LOWER)
MAIN  BLOCK
Note:
 Follow the disassembly procedure in the numerical order given.
SECTION  2
DISASSEMBLY
1
five screws
(P3 
×
14)
2
two claws
3
cabinet (lower)
1
power transformer
5
buzzer board
4
two claws
2
three claws
for chassis
2
three claws
for PWB
3
main block
6
Break the soldering 
of speaker lead.
Page of 21
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Download Sony ICF-C470 / ICF-C470L Service Manual (Repair Manual)

Here you can read online and download Sony ICF-C470 / ICF-C470L Service Manual in PDF. ICF-C470 / ICF-C470L service manual will guide through the process and help you recover, restore, fix, disassemble and repair Sony ICF-C470 / ICF-C470L Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.