Sony tc wr 990 service manual

Page 1

TC-WR99ES/WR990

SERVICE MANUAL

US Model
Canadian Model

PHOTO:TC~ WR990

E Model

TC- WR99ES

AEP Model

TC WR990

Dolby noise reduction and HX Pro headroom extension

manulactured under license from Dolby Laboratories Licensing

Corporation. HX Pro originated by Bang & Olufsen.

DOLBY, the doublerD symbol DC] and HX PRO are trademarks

of Dolby Laboratories Licensing Corporation.

necororng systenr
Fast winding lime
Bias AC bias
Signal-to-notse ratio (al peak level)

(Hrack Ethannel stereo

Approx. so see, (with Sony c-so cassette)

Cassette

Type IV (Sony Type II
(Dolby NR OFF)

Type l
Metal-S/Select) (Sony UX»SJ (Sony HF-S)

59 dB 58 US 56:15

Measured at peak level weighted without NH.
The SM is tmproved by about t5 as at 500 Hz and by about 20 on about

I kHz wilh Dolby-C NR on, and by 5 dB at I kHl and by 0 (33 about 5 kHz

wilh Dolby-B NR on.
Harmonic distortion 0.4% (wllh Sorry Type I, too nwp/m,
sis Hz, 3rd HD.)

1.3% (with sony Typo lv. 250 nwblm,
315 Hz. 3rd m3.)

Frequency response (DOLBV NFl OFF)

Type IV cassette (Sony 25 » 19,000 Hz (to GBJEC)
MelalelSelect) so - tsrooo Hz (:3 dB (-4 dB) recording]

Type ii cassette (Sony .
UX-S) 25 18,000 Hz (13 dBJEC)

Type t cassette

. + 1
(Sony HF-S) 25 IS 000 Hz (J (18 EC)

Wow and llulter : 0 09% W.Pealt (IEO)
0.05% WVRMS (NAB)
1 0.16% W.Peak (olN)

Inputs

Line inputs Sensitivity 0.16 v

(phono jacks)

input impedance 47 kilohms
Outputs
Line outputs Rated output level 0.5 v at a load impedance
(phone tacks) or 47 kllohms
Load impedance Over to kilohms
l-leaophonos Output level a - 3 ier at a load
(stereo phone jack) impedance or 32 ohms

Model Name Using Similar Mechanism

TC-WRSTES/WRWO

Tape Transport Mechanism Type

TOM-200M

SPECIFICATIONS

General

Power requirements AEP model :

220 v 230 v Ac, some Hz
us, Canadian model: 120v Ac, 50H:

E

50/60 Hz
Power consumption 30 W
Dimensions TC - WRQQO :

model 1
1207 220, or 240 V AC adjustabte.

430 x 135 x 350 mm (w/h/d)
(t7 x 5:1. x 13]: inches) including protecting

pans and conlrols

TC-WRQQES:

470 X135 X 350 mm (wlh/d)
(1 8% X 5% x 13% inches) imluding
oroiectlncl parts and controls

Weight TC - WRSSO :

6.5 kg (14 lbs 6 oz)

TC-WH99ESL

7.5 kg (16le 9 oz)

Supplied accesscrles
Audto connecting cords (2)

Wireless remote commander RM-J902 (1) (Except for US/Canadian)
Sony Size SUM-3(NS) (2) (Except for US/ Canadian)

Screws (M3) (4) (TOWRQSES only)

Design and speoilioations subject to change without notice.

Note

This appliance contorms with EEC Dileclwe amoalEEc regarding

lnterlerence suppression.

STEREO CASSETTE DECK
S ONYE

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TC - WR99 ES/W R990

TABLE OF CONTENTS

Section Title Page
SDGCification .......................................... 1
Model Identification .................................. 2
Safety Check-out .................................... 2
1. GENERAL

Identifying the Parts ...............

Hook-up Example ..................

2. DISASSEMBLY ....................................... 5

3. ADJUSTMENTS

8-1. Mechanical Adjustment ~~~~~~~~~~~~~~~~~~~~~ 8
3-2. Electrical Adjustment ~~~~~~~~~~~~~~~~~~~~~~ 8

4. DIAGRAMS
4- 1. Block Diagram .............................. , 12
4-1-1. Circuit Boards Location ~~~~~~~~~~~~~~ 15
4-2. Printed Wiring Boards --------------------- 16
4-3, Schematic Diagram ......................... 21
4-4. Semiconductor Lead Layouts ~~~~~~~~~~~~~~~ 24
5. EXPLODED VIEWS ................................ 29
6. ELECTRICAL PARTS LIST .......................... 33

MODEL IDENTIFICATION

- Specification Label - TC - WR99 ES

TC- WR990

MODEL No. 7//////////l

STEREO CASSETTE DECK

7////////////////////////////%,,

SERIAL N0.
MADE IN JAPAN

US, Canadian Model: AC: 120V 60Hz 30W
AEP Model : AC: 220 - 230~50l60Hz

E Model : AC: 120, 220, 240V~50/60Hz30W

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
SONV PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB«
LISHED BY SONI.

_2_

SAFETY CH EC K-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.

I. A commercial leakage tester, such as the
Simpson 229 or RCA WT-S40A. Follow the
manufacturers instructions to use these instru-
ments.

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

Measuring the voltage drop across a resistor by
means of a VOM or battery~operated AC volt-
meter. The limit" indication is 0.7SV, 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
mullimeters that have a 2V AC range are
suitable (See Fig A)

To Exposed Metal
Parts on Set

A C
voltmeter
(0. 75 v/

0.15M Eggs/(s:
L.._l

'7" faith Ground

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

ATTENTION AU COMPOSANT AVANT RAPPORT
A LA SECURITEI

LES COMPOSANTS memmés PAR UNE MAROUE A
SUR LES DIAGRAMMES SCHEMATIOUES Er LA usre
DES PIECES sour cmrrouss POUR LA séoumré
as FONCTIONNEMENT. NE REMPLACER ces coM-
POSANTS QUE PAR DES PIECES sonv DONT LES
NUMéRos SONT oomés oANs cs MANUEL ou
DANS LES SUPPLEMENTS Pueués PAR SONY.