Sony tc w 380 service manual

Page 1

Photo: TC-W380
O TC-W285 is the stereo double cassette deck section in SEN-280.

US Model

TC-W285
TC-W380

Canadian Model
E Model
Italian Model

TC- W285

SPECIFICATIONS

Recording system

d-track 2-channel stereo
Fast-forward and rewind time

Approx. 120 sec. (with (>60 cassette)
Bias AC Bias
Signal-tonoise ratio (NAB, at peak level)

by R 5 c" OFF B-TYPE ON
Cassette

TYPE IV (Sony METAL-ES) 53 as 65 dB
TYPE ll (Sony uxs) 56 dB 63 as
TYPE I (Sony HF-S) 54 dB 61 dB

Total harmonic distortion
1.0 % (with Sony METAL-ES cassette)

Frequency response (DOLBY NR OFF)

TYPE IV cassette 30-15000 Hz (:3 dB)
(Sony METAL-ES) $043,000 Hz (OVU recording)

TYPE ll cassette CID-14,000 Hz (:3 dB)
(Sony UX-S)

TYPE I cassette (BO-13,000 Hz (:3 dB)
(Sony HFS)

Wow and flutter 0.12% WRMS (NAB)

Inputs

Connector Type Sensitivity Impedance

LINE IN phone 775 mV (-20 dB) 50 kllohms

Outputs

Connector Type Rated output level Load impedance

LINE OUT phono 0.44 V (75 dB) at over 10 kiiohms
load Impedance
47 kiiohms

Model Name Using Similar Mechanism TC-WZOD

Tape Transport Mechnnism DECK A TCM'YM47CW'45

Type DECK B TCM-YM47CW-46
General

Power requirements (TC-W380i
120 V AC, 60 Hz
Power consumption (TC-W380)
12W
Dimensions TC-W380:
Approx. 430 x 117.5 x 250 mm lwlh/dI
(17 x 45/. x 9 7/. inches)
including projecting parts and controls
TC-W285:
Approx. 430 x1175 x 250 mm lw/h/d)
(17 x45/g x 97/5 inches)
including projecting parts and controls
Weight TC-WSSD:
Approx. 3.2 kg (7 lb 202) net
TC-W285:
Approx, 2.85 kg (6 lb 6 oz) net
Supplied accessories (TC-W380I
Connecting cord (2)
System control cord l3-pin) l1)

Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
DOLBY and the doublerD symbol DC are trademarks of
Dolby Laboratories Licensing Corporation.

STEREU CASSETTE DECK
SONY;

Page 2

TC-W285 W380

TABLE OF CONTENTS

Section Title Page

Specifications . . . . . 1
Safety Check-out ...................... 2
SECTION 1. ADJUSTMENTS ............ 3

SECTION 2. DIAGRAMS

2-1. Semiconductor Lead Layouts ........ 5
2~2. Printed Wiring Boards ..... . . . . . . . 6
2-3. Schematic Diagram ............... 9
SECTION 3. EXPLODED VIEWS. . . . . . .. .. ll

SECTION 4. ELECTRICAL PARTS
LIST .................... I6

SERVICING NOTE FOR TC-W285
[To supply B+ voltage]

When this model alone operates, connect the unit
to the regulated DC power supply, since power of this
model is fed from TA-AX285.

I : @ GND

NC

5-pin DC input connector

@Nc

2 V ra regulated dc
power supply
19.5 I/

SAFETY-RELATED COMPONENT WARNINGI!

COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL T0 SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.

ATTENTIoN AU c0MPosANT AYANT RAPPORT
A LA sEcURITEI

LES COMPOSANTS IDENTIFIEs PAR UNE MARCIUE A
sun LES DIAGRAMMES SCHEMATIOUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA sEcURITE
DE FONCTIONNEMENT. NE REMPLACER css coM-
POSANTS QUE PAR DES PIECES SONY DONT LES
NUMERos s0NT DONNES DANS CE MANUEL ou
DANS LEs SUPPLEMENTS PUBLIEs PAR SONY.

of TC~W285 form TA-AX285.

SAF ETY 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 05 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 instru-
ments

2. A battery-operated AC milliammeter. The Data
Precision 245 digital multimeter is suitable for
this jobs

3 Measuring the voltage drop across a resistor by
means of a VOM or battery-operated AC volt-
meterl The limit indication is 075 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)

To Exposed Metal
Pans on Set

Ac
0. 15".: g 7.5km voltmeter
L lo. 75 w

'7" Earth Ground

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