Sony TC K 677ES 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) Lugevinputsk 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
. _ _ . . (phone 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,Canadran model: TC-K570: 120V AC GOHI l8W
Totalharrnomc dlSiOrll1Ol'éo/ (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 (Who)
[13 dB OVU (-4dE!) recording) (17 X 47/5 X 117/5 inches)
_ including projecting parts and controls
Type " cassefle 2° 19900 Hz (*3 dBJECl Weight 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 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 0.5 mA (500 microampersl Leakage
current can be measured by any one of three
methods.

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

to

A battery-operated AC milliammeter. 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-
meler. The limit indication is 075V, so
analog rnclcrs must have an accurate low-
voltage scales The Simpson 250 and Sanwa
SH-63Trd 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 Set

{gm/<52 /
'.__I

1? Earth Ground

AC
voltmeter
(0 75 V)

0.15MF

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

SAFETY-RELATED COMPONENT WARNINGII

COMPONENTS IDENTIFIED BY MARK A 0R 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.

TABLE OF CONTENTS

Section Title Pr! 9
SECTION 1 GENERAL ........ . ........ 3
SECTION 2. DISASSEMBLY- - - - - - . -------- 4
SECTION 3. PIN DESCRIPTION -------- . . . . 8
SECTION 4. ADJUSTMENTS

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

4-2. Electrical Adjustments --------- 12
SECTION 5. DIAGRAMS

5-1. Printed Wiring Boards . ------ . . . 15

5-2. Circuit Boards Location --------- 2]

5-3. Semiconductor Lead Layouts ------ - - 2]

5-4. Schematic Diagram

-Audio Section- .............. 22

5-5. Schematic Diagram

~$ystem Control Section- - - - - . . . . . .25
SECTION 6. EXPLODED VIEWS

6-]. Chassis Section- ---------- . . 29

6-2. Front Panel Section ------ . . . . .30

6-3. Mechanism Section 1 - - - - . . . . . . .31

64. Mechanism Sectionz . . . . . . . . . . .32

SECTION 7. ELECTRICAL PARTS LIST- - ~ - - ' - - ' '33

MODEL IDENTIFICATION

v spear/cation Label - TC-K570

TC-K670
TC-K677 ES

SONY® MODEL NO. V////////////

STEREO CASS ETTE DECK

SERIAL No.
MADE IN JAPAN

US,CanadIan model: TC-K570: AC120V 60Hz 18W

TC-K670, K677ES: ACIZOV GOHZ 19W

AEP, Germany model: AC220V~50/60Hz
UK model: AC240V~50/60Hz
E model: ACIZO, 220, 24OV~50/50HZ 18W

ATTENTION AU COMPOSANT AYANT RAPPORT
A LA sécumrer

LES COMPOSANTS IDENTIFIES PAR UNE MAROUE A
sun LES DIAGRAMMES scnéMArtoues ET LA LISTE
DES PIECES SONT can-loves POUR LA sécuarré
DE FONCTIONNEMENTi NE REMPLACER CES COM-
POSANTS oue PAR oEs PIECES soNv DONT LES
NUMEROS som DONNES DANS c5 MANUEL ou
DANS LES SUPPLEMENTS Pueués PAR SONY.