Sony tc k 570 service manual

Page 1

TC-K570/K670/K677ES

SERVICE MANUAL Canadian Model

AEP Model
UK Model
E Model

TC-K 5 70

US Model
AEP Model

TC-KS 70

US Model
Canadian Model
UK Model

Photo: TC-K677Es TC-K677ES

Model Name Using Similar Mechanism TC-K620/K650ES
SPEC'F'CATIONS TC-K57O TCM-200V7

Tape Transport TC-K67O TCM-200V5

Recording system 4-track 2-channel stereo Mechanism Type _ _
FastAwinding time Approx 90 sec. (with Sony 0-60 TC K677ES TCM 200V4
cassette)
Bias AC bias Inputs
Heads Erasing head><1 (S&F head) . . 5 st' 775 V
Recording head x 1 (Permalloy head) Lugeinputsk en Wily ' m
Playback head X 1 (LA head) (P °"° )ac 5) Input Impedance 47 k ohms
MOMS 0395!" m°l°r X CD DlRECT lNPUT Input impedance 47 k ohms
(DC servo motor)
Reel motor x 1 (DC motor) Outputs
l T h ' | ' 1
EADSCSmggergz amca drive) motor >< Line outputs Rated output level 032 V at a load
. _ _ . . (phono jacks) impedance of
Signal to nOIse ratio (at peak level) 47 k ohms
Dolby NR switch B-Type C-Type .
Cassette OFF ON ON Load tmpedance Over 10 k ohms
Headphones Output level 0-1.25 mw at a
Type lV(Sony METAL-SLT/S) SOUB 69 dB 75 dB (sereo phone load impedance
Type (Sony UX-S) 59 dB 68 dB 74 dB jack) 0132 ohms
Type l(Sony HF»S) 57 dB 66 dB 72 dB General
, . . Power requirements US,Canadian model: TC-K570: 120V AC GOHI l8W
Totalharrnomo d'smnfréo/ (with Son METAL~SLTIS TC-K670, K677ES:120V Ac 60H119W
0555;) y AEP, Germany model: 220vac~so/sonz
UK model: 240VAC~50/60Hz
Frequency response (DOLBY NR OFF) E model: 120' 220, 240VAC~50/50Hz 18w
Type IV cassette 20-21,000 Hz (:3 dB.lEC) pewer consumpfion 19 W
(Sony METAL«SLT/S) 20-16000 HZ , Dimensions Approx. 430 X 123 x 300 mm (Wm/d)
[:3 dB OVU (MB) fecofdmgl (17 x 47/5 x 117/5 inches)
_ including projecting parts and controls
Type M cassette 20 19,000 Hz (:3 dB,IEC) Weigh, Approx. 4.9 kg (10 lbs 13 oz)
(Sony UX«S)
Supplied accessories
Type | cassette 20-17000 Hz (13 dB,|EC) Audio connecting cords (2)
(SONY HF'S) Design and specifications subject to change without notice.
Wow and flutter t0.09% W.Peak (lEC) Note
0.05% WRMS (NAB) This appliance conforms with EEC Directive 87/308/EEC
10-14% W-Peak (DIN) regarding interference suppression.

Dolby noise reduction manufactured under license from STEREO CASSETTE DECK
Dolby Laboratories Licensing Corporation.
"DOLBY" and the doub|e

. Dolby Laboratories Licensing Corporation ®

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TC-K570/K670/K677ES

SAFETY CHECK-OUT TABLE OF CONTENTS

Section Til/e Page

After correcting the original service problem,
perform the following safety check before releasing SECTION 1. GENERAL ------------ - - - - - 3
the set to the customer: SECTION 2. DISASSEMBLY .......... . . . . . 4
Checktheantenna terminals, metal trim, metalhzed SECTION 3. PIN DESCRIPTION _ _ _ _ _ ...... 8

knobs, screws, and all other exposed metal parts for

AC leakage. Check leakage as described below. SECTION 4' ADJUSTMENTS

4-1. Mechanical Adjustments - - - - - - - - - g

4-2. Electrical Adjustments - . - - - - ~ - -12
LEAKAGE TEST SECTION 5. DIAGRAMS
The AC leakage from any exposed metal part to 5-1. Printed Wiring Boards - - - - . ..... 15
earth ground and from all exposed metal parts to any 52- Circuit Boards Location ' ' ' ' ' ' ~ . - 21
exposed metal part having a return to chassis, must 5'3- semicmflumfi Lead LayOUtS' ' ' ' ' ' ' ' 21
not exceed 0.5 mA (500 microampers). Leakage 54 §Chematl° Diagram
current can be measured by any one of three Awa SBI°_ """ ' """ 22
methods. 5-5. Schematic Diagram
-System Control Section- - - - ------- 25
I. A commercial leakage tester, such as the SECTION 6. EXPLODED VIEWS
Simpson 229 or RCA WT-540A. Follow the 5.1. Chassis Section- . . . . . . . ..... 29
manufacturers' instructions to use these instru- 5.2 Front Panel Section . . . ........ 30
ments. 53. Mechanism Section 1 .......... . 31
2. A battery-operated AC milliammeter. The Data 54- Mechanism 390W? 2 ' """"" 32
Precision 245 digital multimeter is suitable for SECTION 7. ELECTRICAL PARTS LIST --------- 33
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 rnctcrs must have an accurate low-
voltage scale. The Simpson 250 and Sanwa
SH-G3Trtl are examples of a passive VOM that

MODEL IDENTIFICATION
- Specification Label -

is suitable Nearly all battery operated digital 12:82:
multimeters that have a 2V AC range are TC-K677ES

suitable. (See Fig. A)

SONY® MODEL NO. W//////////

STEREO CASS ETI'E DECK

To Exposed Metal
Part: on Set

AC SERIAL No.
0.15uF glfikil / voltmeter MADE IN JAPAN
(0.75 V)

US,Canadian model: TC-K570: AC120V BOHZ 18W
TCVKG70, K677ES: ACIZOV BOHZ 19W
AEP, Germany model: AC220V~50/60Hz
UK model: AC240V~50/60Hz
E model: AC120, 220, 24OV~50/60HZ 18W

5? Earth Ground

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

SAFETY-RELATED COMPONENT WARNING
COMPONENTS IDENTIFIED BY MARK A OR DOTTED

ATTENTION AU COMPQSANT AYANT RAPPORT
A LA SECURITEI

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.

LES COMPOSANTS IDENTIFIES PAR UNE MAROUE A
sun LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA SECURITE
DE FONCTIONNEMENTr NE REMPLACER css COM-
POSANTS oue PAR DES PIECES SONY DONT LES
NUMéRos SONT DONNES DANS c5 MANUEL ou
DANS LES SUPPLEMENTS PUBLIES PAR SONY.