Sony cfs w 455 service manual

Page 1

.CFS-W455

SERVICE MANUAL

US Model
Canadian Model

Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MF-W455
SPEClFICATIONS
AUDIO POWER SPECIFICATIONS (U S M OD EL) Power output 2.3 w + 2.3 w (at 10 % harmonic distortion in
. DC -
POWER OUTPUT AND TOTAL HARMONIC EEZLZiég'riifiim 120 W3 21%:

DISTORTION:

With 3.2 ohm loads, both channels driven, from
ISO-10,000 Hz; rated 18 w per channel
minimum RMS power, with no more than 10 %
total harmonic distortion in AC opera tion.

Other Specifications

Frequency range FM: 876-108 MHz
AM: 530-1710 kHz

Antennas FM: Telescopic antenna
AM: Built-in ferrite bar

Recording system +track, 2-charmel stereo

Frequency response 80-8,000 Hz

Speakers Two way 10 cm (4 inches) dia. woofer x 2
2 cm (/n inches) dia. tweeter x 2

Outputs PHONES jack (stereo minijack)

for 8-300 ohms impedance headphones
Speaker jacla for supplied 32 ohms impedance
speaker

Power consumption
Battery life

Dimensions

Mass
Accessory supplied

9 V DC, six size D (R 20) batteries
14 Win AC operation

Batteries FM recording
Sony SUM<1 (NS) Approx 14 hours

Sony AM] (N) alkaline Approx. 44 hours

Approx. 530 x 216 x188 mm (w/h/d)

(22 7/. x s 5/. x 7 A inches) incl. projecting parts and
controls, not incl. handle

Approx, 5.0 kg(10 lb 6 oz) inclr batteries

AC power cord (1)

Design and specifications are subject to change without notire.

RADID CASSETTE-BORDER

SONYr

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TABLE OF CONTENTS

Section Title Page

._.

Specifications . . . . .............................
1. GENERAL ............................. 3
2. DISASSEMBLY ...... . .................. 4

3. ADJUSTMENTS

3-1. Mechanical Adjustments ~ ~ 6
3-2. Electrical Adjustments
Tape Section - - . . . 6
Tuner Section - . 8
4. DIAGRAMS
4.1, BlockDiagram ..... . ............ . 10
4-2. Printed Wiring Boards . . . . . ............... . 12
4-3, Schematic Diagram ....................... 15
5. EXPLODED VIEWS ~~~~~~~~~~~~~~~~~~~~ 19
6. ELECTRICAL PARTS LIST ~~~~~~~~~~~~ 24

SAFETY»RELATED COMPONENT WARNING! |

COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A 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 SONV.

ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITE!

LES COMPOSANTS IoENTIEiEs PAR UNE MAROUE A
sun LEs DIAGRAMMES SCHEMATIOUES ET LA LISTE
DES PIECES SONT CRITIouEs POUR LA sEcumrE
DE FONCTIONNEMENT. NE REMPLACER CES com-
POSANTS QUE PAR DES PIECES sonv DONT LES
NUMERos sONT DONNES DANS CE MANUEL 0U
DANS LES SUPPLEMENTS PUBLIES PAR soNv.

SAFETY CH ECK-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.

I. A commercial leakage tester, such as the
Simpson 229 or RCA WT»540A. Follow the
manufacturers instructions to use these instru-
ments.

to

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 volt-
meter. The limit indication is 0.75V, 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 3 2V AC range are
suitable. (See Fig. A)

To Exposed Metal
Parts on Set

AC
0. 75uF -��75 kn voltmeter
(0. 75 V)

"7' Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.