Sony TC K 679ES Service Manual

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TC-K679ES/ K690

SERVICE MANUAL us Model

TC- K679ES
TC' K690

Canadian Model
UK Model

TC*K67QES

AEP Model

TC K690

Dolby noise reduction manufactured under license from

Dolby Laboratories Licensing Corporation.

"DOLBY" and the double-D symbol DU are trademarks of

Dolby Laboratories Licensing Corporation PhotozTc~ K679ES

Model Name Using Similar Mecanism TC-K677ES/K670

SPECIFICATIONS
Tape Tlanspofi TC- K679E$ TCM- 200V9
Recording system 4-track 2-channel stereo Mechanism TYDe TC- K690 TCM- 200V] 0
Fast winding time Approx 90 see. (with Sony 0-60
cassette)
Bias AC bias lnputs
Heads Erasing head xdt (fagohiadlj) Line inputs Sensitivity 01 6 V
Recording hea >< ea (phono lacks) . .
Playback head x 1 (LA head) (K679ES) '"PU 'mpedance 47 0th
Playback headx 1 (SD head) (K690) Outputs
Motors Capstan motor x 1 (DC servo motor) ,
Reel motor X 1 (DC motor) Line outputs Rated output 0.5 V at a load
ASlST (mechanical drive) motor x 1 (p"°° lac) 'eve' 139$??? °
. , . (DC motor) Load Over 10 kilohms
SIgnaHo-noise ratio (at peak level) impedance
Cassette Type Iv Type II Type l Head hones o t t i | 0 ~- 3 mW at a load
(Dolby NR (Sony Metal- (Sony uva) (Sony HF-S) (Wei; Phone jack) 9 eve impedance 0,
OFF) Select/S) 32 ohms
60 dB 59 dB 57 dB
Measured at peak level weighted without NH. The SIN is General
improved by about 15 dB at 500 Hz and by about 20 :15 Power requlrements 120V AC. 60H: : K679ES (US.Canadian)
about 1 kHz with Dolby-C NFl on, and by 5 dB at 1 kHz and K690 (US)
by 10 dB about 5 kHz with Dolbva NR on. 240v Ac. 50H: : K679Es (UK)
220 - 230V AC. : K690 (AEP. Germany)
Harmonic distortion (or 240V AC adjustable
04% (with Sony Type I, 160 nWb/m, by Sony personnel). 50/ GOHze
315 Hz, 3rd H,D,) Power consumption 19 W
145% (With 30W TYpe 1V. 250 nWb/m, Dimensions Approx 430 x 123 X 300 mm (w/h/d)
315 Hz, 3rd HD-l (17 x 4% x 117/3 inches)
Frequency response (DOlbY NR OFF} including projecting parts and controls
Type IV cassette 20- 21 .000 Hz (e seam) (K679ES) WW Approx 4-9 kg (10 lbs 13 02)
(Sony Metal-Select/ 20- 20,000 Hz (t SdBJEC) (K690) Supplled accessories
3) 20' 16.000 HZ [1 3dB <' MB Audio connecting cords (2)
recording)] V 4 ~ _ .
Type ll cassette 20-19,000Hz ( i 3dB,lEC) (K679Es) 5:1:an and speulications are subject to change Without
(Sony Ux-S) 20- 18,000 Hz (: 3dB,lEC) (K690)
Type I cassette
2 -l7,0 H (t 3 dB,IEC
° > STEREU CASSETTE DECK
Wow and llutter :0t09% W.Peak (lEC)

0.05% WeRMS (NAB)
i0.l4% W,Peak (DIN)
®

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TC- K679ES/ K690

TABLE OF CONTENTS

Section Title Page
LGENERAL ............... . .......................... 3
2. DISASSEMBLY ......................... . ............ 4
3. PIN DESCRIPTION ................................. 7
4. ADJUSTMENTS

4- 1 Mechanical Adjustments ~~~~~~~~~~ ......... 8
472. Electrical Adjustment ----------- .. ~~~~~~~~~~~ ' ll
5. DIAGRAMS

5'71. Circuit Boards Location ~~~~~~~~~~~ . ~~~~~~~~~ 15
5~2i IC Block Diagram ----------------------------- 15
5-3. Printed Wiring Boards ....... . 17

5-4.
5-5.

Schematic Diagram --------

Semiconductor Lead Layouts ~ ~

6. EXPLODED VIEWS

6- 1 Chassis Section ......................... . ..... 27
6- 2. Front Panel Section ~~~~~~~~~~~~~~~~~~~~~~~~~ 28
6-3. Mechanism Section 1 ~~~~~~~~ ~ - . - . . ' ~~~~~~ 29
6-4 Mechanism Section 2 ~~~~~~~~~~~~~~~~~~~ . ~ 80
7 ELECTRICAL PARTS LIST ------------------------ 31
MODEL IDENTIFICATION TC- K679ES
- Specification Label - TC- K690

SONYo MODEL N0.
STEREO CASSETTE DECK

SERIAL No.
MADE IN JAPAN

US, Canadian model: ACIZOV 60H2 19W
UK model : ACZ40~50/60Hz
AEF. Germany model : ACZZO-23OV~50/80Hz

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
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.

SAFETY CH ECK-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-540A. Follow the
manufacturers instructions to use these instru-

ments.

2. 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-
meter. The Iimit indication is 0i75V, 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
multimeters that have a 2V AC range are
suitable. (See Fig. A)

To Exposed Metal
Part: on Set

AC
voltmeter
{075 V}

1.5kll

0.15;»: T /
;_.

Earth Ground

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

ATTENTION AUCOMPOSANT AYANT RAPPORT
A LA SECURITE!

LES composmrs IDENTIFIES PAR UNE MAROUE A
sun LES DIAGRAMMES SCHEMATIQUES ET LA LISTE
DES mécss SONT CHIIIOUES POUR LA sécumré
DE FONCTIONNEMENT. NE REMPLACER css com-
POSANTS nus PAR DES nieces souv DONT LES
NUMéRos sour DoNNés DANS CE MANUEL ou
DANS LES SUPPLEMENTS PUBLIES PAR sonv.