Sony ICF-C135 Service Manual Download Page 2

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ATTENTION  AU  COMPOSANT  AYANT  RAPPORT

À  LA  SÉCURITÉ!

LES  COMPOSANTS  IDENTIFIÉS  PAR  UNE  MARQUE  

0

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  

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.

SAFETY  CHECK-OUT

After correcting the original service problem, perform the following
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” indication is
0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of a
passive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2 V AC range are suitable.  (See Fig. A)

Fig. A.

Using an AC voltmeter to check AC leakage.

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.

SECTION  1

SERVICING  NOTES

HOW  TO  CHANGE  THE  FM  CERAMIC  FILTERS

This model is used two ceramic filters of CF1 and CF3.
You must use same type of color marked ceramic filters in order to
meet same specifications.
Therefore, the ceramic filter must change two pieces together since
it's supply two pieces in one package as a spare parts.

CF1

mark 2

CF3

mark 2

mark 1

CORD  DRESSING
(POWER, ANTENNA, BATTERY)

1) Connect the power cord, antenna cord, and battery cord as

shown in the figure.

2) Mount the chassis with screws (PTP3 

×

 10).

Note: Tighten completely the screws (PTP3 

×

 10).

1.5 k

0.15 

µ

F

AC
voltmeter
(0.75 V)

To Exposed Metal
Parts on Set

Earth Ground

battery cord

screw (PTP3 

×

 10)

antenna cord

power cord

chassis

Mark 1 Mark 2

Center

frequency

red

10.70MHz

blue

10.67MHz

orange

10.73MHz

black

10.64MHz

white

10.76MHz

white

white

10.75 MHz

yellow

10.79 MHz

Summary of Contents for ICF-C135

Page 1: ...ICF C135 US Model Canadian Model SERVICE MANUAL FM AM CLOCK RADIO MICROFILM SPECIFICATIONS FEATURES Ver 1 0 1999 10 ...

Page 2: ...nts 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 aVOM or battery operated AC voltmeter The limit indication is 0 75 V so analog meters must have an accurate low voltage scale The Simpson 250 and Sanwa SH 63Trd are examples of a passive VOM that is suitable Nearly all battery operat...

Page 3: ... 3 SECTION 2 GENERAL This section is extracted from instruction manual ...

Page 4: ... 5 As shown in figure marking A of TUNE knob and marking B of VOL knob setting 4 screw P3 10 8 RADIO board 2 Set the pointer to the guide line 3 chassis 7 Turn CV1 and RV1 shaft in the arrow direction fully 6 speaker pointer guide line knob TUNE knob VOL marking A CV1 RV1 RADIO board Conductor Side marking B ...

Page 5: ...ading on level meter T1 455 kHz Adjusting Location RADIO board Component Side Clock Frequency Check Confirm that the reading on the frequency counter is 900 Hz If frequency is higher change capacitor value of C101 If frequency is lower change resistor value of R101 200 100 FM RF signal generator 22 5 kHz frequency deviation by 400 Hz signal FM lead wire antenna terminal speaker terminal 0 01 µF se...

Page 6: ... D202 F 6 D203 C 7 D204 G 4 D205 G 3 IC1 D 4 IC101 G 4 LED101 H 4 Q1 F 2 Q201 D 6 Q202 D 7 Note on Printed Wiring Boards X parts extracted from the component side Y parts extracted from the conductor side W indicates side identified with part number f internal component b Pattern from the side which enables seeing ...

Page 7: ...ations may be noted due to normal produc tion tolerances Signal path F FM f AM Note The components identi fied by mark 0 or dotted line with mark 0 are criti cal for safety Replace only with part number specified Note Les composants identifiés par une marque 0 sont critiques pour la sécurité Ne les remplacer que par une piéce portant le numéro spécifié 1 2 3 4 5 6 7 8 9 10 15 14 13 12 11 FM DISCRI...

Page 8: ...ON SLIT A 3663 419 A RADIO BOARD COMPLETE 1 535 804 11 SNAP BATTERY 3 922 610 01 HOLDER ANTENNA CAPACITOR C1 1 163 088 00 CERAMIC CHIP 5PF 50V C2 1 163 233 11 CERAMIC CHIP 18PF 5 50V C3 1 163 102 00 CERAMIC CHIP 24PF 5 50V C4 1 163 251 11 CERAMIC CHIP 100PF 5 50V C5 1 163 031 11 CERAMIC CHIP 0 01uF 50V C6 1 126 964 11 ELECT 10uF 20 50V C7 1 163 031 11 CERAMIC CHIP 0 01uF 50V C8 1 126 963 11 ELECT ...

Page 9: ...SLEEP OFF TRANSFORMER T1 1 404 790 11 TRANSFORMER IF FLAT CABLE W701 1 776 983 11 CORD CONNECTION W702 1 769 137 11 CORD CONNECTION 16 CORE MISCELLANEOUS 014 1 783 817 11 CORD POWER SP1 1 504 748 21 SPEAKER 6 6CM 0T101 1 435 201 11 TRANSFORMER POWER ACCESSORIES PACKING MATERIALS 3 867 923 11 MANUAL INSTRUCTION ENGLISH FRENCH CND 3 867 923 21 MANUAL INSTRUCTION ENGLISH US The components identified ...

Page 10: ... 14 ICF C135 Sony Corporation Personal Audio Division Company 99J1620 1 Printed in Japan 1999 10 Published by General Engineering Dept 9 927 609 11 ...

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