Sony tc wr 890 service manual

Page 1

TC-WR890

SERVICE MANUAL AEP Model

canon C
.5 man
330% H3 _..._3

Dolby noise reduction and HX Pro headroom extension

manufaciured under license irom Dolby Laboraiories Licensing Model Name Using Similar Mechanism TC-WR870

Corporation HX Pro originaied by Bang & Olufsenr

Tape Transport Mechanism Type TCM - 200R5
DOLBY, the double-D symbol DD and "HX PRO" are trademarks
of Dolby Laboratories Licensing Corporation
SPECIFICATIONS
Recording sysiom «rack 2~channel stereo General 220 ~ 230 v Ac, (or 240 v AC
Fasi Winding iimo Approx. 90 sec, (wiih Sony c-eo cassette) Power requiremenis adjustable by Sony personnel),
eias Ac bias soreo Hz
Signal~io~noise ratio (at peak level) Power consumption 30 w
Dimensions 430 x 135 x 350 mm (W/h/d)
Casseue Type IV (Sony Type 1| Type | (i 7 x 53/. x 137/. inotros) inctuding proieciing
(Dolby NR om Metal-5i (Sony ux-si (Sony HRS) pans and conucls
59 dB 55 dB 56GB Weigh! 5.5 kg [14 (b3 6 02)
Measured at peak ievei weighied wrihoui NR. Supplled accessories
The SM is Improved by mm is as or 500 Hz and by aboul 20 dB about Audio connecnng cords (2)
1 kHz wim Doiby-C NR on, and by 5 dB at 1 kHz and by 10 dB about 5 kHz Wireless remote commander aM-Jsoa <1)
wiih Dolby-B NH on Sony srzo summsi (2)
Harmonic oisionion owe iwirn Sony Type i 160 nWb/m,
315 Hz. 3rd Ho.) Design and speoriroatipns aimed to change wimoui noripo,
\.B% (with Sony Typo iv, 250 nWb/m.
315 Hz, 3rd Hm Note
Frequency response (DOLBY NR om Thls appliance opniorms wiin EEC Direclive 57/308/EEC regarding
Type IV casseue (Sony 25 A 19.000 Hz (13 (15.150) ween ppeSS'm
Moms) 30 - 15,000 Hz [:3 pa (-4 dB) recording]
Type ii cassene (Sony 25 y H 63 .EC
u><~si 15.000 1 (:3 . )
Type Icassoite _ 1 _ H t I
(Sony HRS) 25 6 000 z( 3 d3, EC)
Wow and iiutior s o 09% W.Peak user
0 06% warns {NAB}
.E 0.16% WVPeak (DIN)
inputs
Line inputs Sensitivity 0.16 v
"W '3) inpui impedance 47 kilohms
Outputs
Lino ouiputs Hated outpui level 0,5 v at a load impedance
(phone jacks) oi 47 kilohms
Load impedance Over 10 kilohms
Headphones Ou|pul ioyei o - 3 rnw al a toad

STEREO CASSETTE DECK

SONYa

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TC- WR890

TABLE OF CONTENTS
Section Title Page
Specification-~--~--~~-v~m~~~v~~ru-~ ..... ..... 1
Featul-es ...... H... ...... ..........,.............. 2

1. GENERAL
Identifying the Parts ................ . . . . . 3
2. DIS ASSEMBLY ............. . . . . . . . ........... . ..... 5
3. ADJUSTMENTS
3- 1. Mechanical Adjustment ----- ~ - ~ ~ - - . . ----- ~ ~ ~ 8
3-2. Electrical Adjustment~-v-m~~~-~--~~-~--~ 8
4. DIAGRAMS
4- l. Semiconductor Lead Layout ----- 12

4- 1- 1. Circuit Boards Location - - ~ ~

4-2. Printed Wiring Boards 16
4-3, Schematic Diagram--~-~-~~--~~---~ ..... ...21
4-4. Semiconductor Lead Layouts --------------- 24
5. EXPLODED VIEWS . . . . . . . . ........................ 29

33

6. ELECTRICAL PARTS UST ~~~~~~~~~~~~~

SAFETV-RELATED COMPONENT WARNING

COMPONENTS IDENTIFIED BV 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 SONY.

Features

For higher quality recording/playback

- The Dolby HX PRO" system which improves the linearity of the
tapes high-range response during recording,

~ independent B and C type Dolby NR" systems on each deck
which allow the tree selection of Dolby systems on each deck
during Simultaneous Recording, Relay Recording, or normal-speed
dubbing.

- Independent bias calibration on each deck to achieve the
optimum bias current setting ior any tape.

For your convenience

~ Quick reversing at the end of a tape to minimize interruptions
during playback and recording.

- Automatic tape type detection during playback and recording.

- The Multi-AMS, Blank Skip and Memory Play functions which
provide easy access to a desired selection.

- A relay function for long recording and playback

- Auto play function which automatically starts playback after tape
rewinding to start,

- Timer-activated playback and recording through the use at an
optional timer.

- Synchronized clubbing at normal or high speed

. Simultaneous Recording function for the simultaneous recording
of the same source to cassettes in both decks.

- A dubbing level control which allows the dubbing volume level to
be varied during normal-speed dubbing.

- A tape speed control for varying the tape speed (on deck A)
during playback and normal-speed dubbing

For easier operation
~ Twin easy«to read digital linear counters which show the
elapsed recording or playing time on each deck.