Sony tc wr 820 service manual

Page 1

SERlilCE MllNUAL ammo

AEP Model
UK Model
E Model

Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
"DO LBY" and the double-D symbol DE] are trademarks of
Dolby Laboratories Licensing Corporation,

Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type TCM-200R3
SPECIFICATIONS
Recording system 4-track 2-channel stereo General
Biaasst wmdlng tlme 2&9;st sec (W'm HFSO cassette) Power requmsments AEP model: 220V AC. 50/60Hz
Signal-to-noise ratio (NAB, at peak level) Canadian model: 120 V AC. 60 Hz
Dolby NR switch OFF 53.wa (>wa UK model: 240V AC. 50/60Hz
Cassette ON ON E model: 120. 220. or
TYPE lV (Sony METAL-ES) 59 dB 67 dB 74 dB 240V AC adjustable.
TYPE ll (Sony UX-S) 58 dB 66 dB 73 dB 50/60Hz
TYPE I (Sony HF-S) 55 dB 64 dB 71 dB Power consumption 29 watts
_ . _ Dimenslons Approx. 430x1a5x 345 mm (wlhld)
Total harmonlc dlstoltlon

(17 x 5% x 135/, inches)

10% (with 5" METALES cassettes) including projecting parts and controls

Frequency resvonse (DOLBY NR OFF) Weight Approx 6.2 kg (13 lbs 11 oz)
TYPE lV cassette 25 - 18,000 Hz (:3 (18)
(Sony METAL-ES) 30 - 15,000 Hz (OVU recording) Supplied accessorles A d
. u in connecting cord (2)
(T5225 gigsene 25 '00" Hz (:3 Bi AEP model : Wireless remote control unit RMvJ901 l1)
: S R
TYPE I cassette 25 _ 16,000 Hz (:3 dB) AEP model any 6 (Size AA) batteries (2)
(Sony HF-S)
lelguwtsand flutter 0.06% WRMS (NAB) Design and specltications subject to change without notice.
Line inputs Sensitivity 97.5 mV (-18 dB)
(phono )acks) Input impedance 50 kohms
Outputs
Line outputs Rated output level 044 V (~5 dB) at
(phone jacks) a load impedance
of 47 kohms
Load impedance Over 10 kohms
Headphones Output level 0-25 mW at a
(stereo phone jack) load impedance oi
32 ohms

STEREU CASSETTE DECK
ONE

Page 2

TC- WR820

TABLE OF CONTENTS

SLtm Title Page
Specificationsnn--vv---ir------'~°--°~-°-°-°-~-~-- 1
Features 2
LGENERAL

Identification of Front Panel Parts 3
Z.D|SAS$EMBLY 4
3. ELECTRICAL ADJUSTMENTS

3-1. Mechanical Adjustments - 7

3-2. Electrical Adjustmentsu-ummu 7
4. DIAGRAMS

4-1. Semiconductor Lead Layouts ................11

4-2. Circuit Boards Location 12

4-3,}0 Block Diagram.................. .......13
4-4. Printed Wiring Boards'nnu-mn .......14
4-5. Schematic Diagram. .. .. 19

5. EXPLODED VIEWS"

27

6. ELECTRICAL PARTS 51' 31

0 The Dolby HX PRO system which improves the
linearity o! a lapes highvrange response during
recording,

0 Automatic recordan level adjustment for onetouch
protection against distortion.

- A relay lunctlort lor long recording and playback

- Quick reversing at the end of a tape to mlnimlze
interruptions during playback and recording,

- Fade-in and lads-out lunctions to start and end
recordings with a professional touch.

0 Auto-synchro dubbing at normal or high (double)
speed.

0 AMS and memory play lunctions which provide easy
access to desired selections

- An easy-to-read linear counter which shows the
elapsed recording or playback time for decks A and B.

* Dolby noise reduction and HX Pro headroom extension
manufactured under license from Dolby Laboratories
Licensing Corporation, Hx Pro originated by Bang a Olulsen.
"DOLEtY", the double-D symbol DO and HX PRO are
trademarks of Dolby Laboratories Licensing Corporation.

MODEL IDENancATloN
- Specification Label -

TC- WR820

SONY.

MODEL N0.

STEREO CASSETTE DECK

WWW

seam No.
mo: in «mm

Canadlan Model: AC: 120V GONE 29W
West Germany. AEP Models: AC: 220V ~ 50/ 60H: 29W
UK Model : AC : 240V ~ 50/60Hl 29W
E Model 2 AC : l20/ 220/ 240V ~ 50/ SOHZ 29W

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, metallizcd
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.

l. A commercial leakage tester, such as the
Simpson 229 or RCA WT-S4OA. Follow the
manufacturers' instructions to use these instru-
ments.

2. A battery-operated AC milliammcter. 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 0.75 V, so
analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-63'lrd are examples of a passive VOM that
is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are
suitable. (See Fig. A)

To Exposed Metal
Part: on 5::

AC
0.15uF -[ §I.Skn / voltmeter

(0.75 V)
._l

E's/(h Ground

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

SAFETYvRELATED COMPONENT WARNING

COMPONENTS lDENTlFlED BY SHADING AND MARK
A ON THE SCHEMATIC DIAGRAMS AND IN THE
PARTS LIST ARE CRITICAL TO SAFE OPERATION.
RE?LACE THESE COMPONENTS WITH SONV PARTS
WHOSE PART NUMBERS APPEAE AS SHOWN IN THIS
MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT
A LA sacumrer

LES COMPOSANTS IDENTIFIES PAR UNE TRAME ET
UNE MAROUE A SUR LES DIAGRAMMES SCHE~
MATlOUES ET LA LISTE DES PIECES SONTCRITIOUES
POUR LA SECURITE DE FONCTIONNEMENT. NE REMv
PLACER CES COMPOSANTS CUE PAR DES PIECES
SONY DONT LES NUMERDS SONT DONNES DANS CE'
MANUEL 0U DANS LES SUPPLEMENTS PUBLIES PAR
SONY.