Sony tc w 490 service manual

Page 1

TC-W490

SERVICE MANUAL

US Model
Canadian Model
AEP Model

UK Model
E Model

SPE ClFlCATIONS

4-track 2-channel stereo
Approx. 90 sec (with Sony 0-60 cassette)

Recording system
Fast winding time

Bias AC bias
Signal-to-noise ratio (at peak level)
Cassette Type IV Type ll Type l
(Dolby NR OFF) (Sony MetaI»S) (Sony UX»S) (Sony H98)
58 dB 57 dB 55 dB

Measured at peak level weighted without NR. The S/N is improved by about
15 dB at 500 Hz and by about 20 dB about 1 kHz with Dolby-C NR on, and by
5 dB at 1 kHz and by 10 dB about 5 kHz with Dolbva NR on.

0.4% (with Sony Type I, 160 nWb/m, 315 Hz.
3rd H.D.)

1.8% (with Sony Type [Vt 250 nWb/m, 315 Hz,
3rd H.D.)

Frequency response (DOLBY NR OFF)

Type IV cassette (Sony 30 - 18,000 Hz (:3 dB.lEC)
Metal-S) 30 - 13,000 Hz [:3 dB (-4 dB) recording]

Harmonic distortion

Type ll cassette (Sony . + BlEC
ux-si 30 17.000Hz(_ad, )

Type I cassette

-1 000 i ,|
(Sony HF-S) 30 5, Hz( 3dB EC)

Model Name Using Similar Mechanism

TC-W320/W370

Tape Transport Machanism Type

DECK A TCM-190VA12CS
DECK B TCM-1 QOVBi 20$

1 0.14% W.Peak (IEO)
0,08% warms (NAB)
: 0.19% W.Peak (DIN)

Wow and flutter

inputs
Line inputs
(phono jacks)

Sensitivity 01 6 V
47 kilohms

input impedance

Outputs

Line outputs
(phono jacks)

Rated output level 0.5 V at a load impedance

of 47 kilohms

Load impedance Over 10 kilohms

Headphones Output level 1 mW at a load impedance

(stereo phone jack) of 32 ohms

General
Power requirements us. Canadian Model :
120V AC, 60 Hz
AEP Model :
220-230V AC. (or 240V AC adjustable by
Sony personnel ). 50/80 Hz
UK Model :
240V AC (or 220V AC adjustable by
Sony personnel)50180 Hz
E Model :
120, 220 or 240V AC adjustable» 50/80 Hz
Power consumption 23 W
Dimensions Approx. 430 x 123 x 285 mm (w/Wd)
(17 x 47/. x 11% inches) including projecting
pans and controls
Weight Approx. 45 kg (9 lbs 15 oz)

Supplied accessories
Audio connecting cords (2)

Design and specifications subject to change wrthout notice.
Note

This appliance conforms with EEC Directive 87/308lEEC regarding
interference suppression

Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporationr
"DOLBY" and the double-D symbol DD are trademarks of
Dolby Laboratories Licensing Corporation.

STEREO CASSETTE DECK
S ONE

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TC-W490

TABLE OF CONTENTS

Section Iitle Rage

Specifications
Safety Checkvout '

1. GENERAL
1-1. mum-Mme Pans ............................................... 4

2. DISASSEMBLY

2-1, Front Panel """" ...5

2-2. Mechanism Deck 5

2-3. Capstan Motor, Reel Motor 6

2-4. Head, Pinch Roller" 6
3. EXPLANATION OF IC TERMINALS """"""""" 7
4 ADJUSTMENTS

4-Il Mechanical Adjutments ------------------------------------ 9

4-2. Electrical Adjustments ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 9

5. DIAGRAMS
5-1, Block Diagram """""
S-Zt Printed Wiring Boards
53- Shematic Diagram (System control section) "
5-4, Shemazic Diagram (audio section) ------------------

6. EXPLODED VIEWS
6-1. Chassis Section
6-2. Front Panel Section "
6-3. Mechanism Section 1
6-4. Mechanism Section 2

7.ELECTRICAL PARTS LIST

MODEL IDENTIFICATION
(Speclflcatlon Label)

SONYO MODEL NO. TC-W490

STEREO CASSETTE DECK

US, Canadian model : AC120V GOHZ 23W
AEP, Germany model : A0220-230V ~ 50/60Hz
UK model : A0240V ~ 50/60Hz
E model : A0120, 220, 240V ~ 50/60Hz 23W

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