Sony tc k 770 es service manual

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TC-KTTOES

SERVICE MANUAL

AEP Model

Dolby noise reduction and HX Pro headroom extension
manufactured under license from Dolby Laboratories Licensing
Corporation. HX Pro originated by Bang & Olufsenr

DOLEV, the double-D symbol DH and

HX PRO are

trademarks of Dolby Laboratories Licensing Corporation

Recording system
Fast winding time
Bias

Heads

Motors

SPECIFICATIONS

4-track 2.channel stereo

Approx, 90 sec. (with Sony 0-60 cassette)
AC bias

Erasing head x 1 (S&F head)

Recording head x 1 (Permalloy head)
Playback head ><1 (Permalloy head)
Capstan motor x1 (direct drive linear torque
BSL motor)

Reel motor x 1 (DC motor)

DC motor x I
Signal-to-noise ratio (at peak level)
Dolby NR switch
021W OFF B~Type ON C-Type ON
|
2:; LET/(LS) 61 dB 70 dB 76 dB
Type it (Sony UX-S) 59 dB 68 dB 74 dB
Type I (Sony HF-S) 57 dB 66 dB 72 dB

Total harmonic distortion 10% (with Sony METAL-S cassettes)
Frequency response (DOLBY NR OFF)

Type IV cassette

20 - 21,000 Hz (:0 dB, use)

(Sony METALS) 20 - 16,000 Hz [:3 dB 0vu recording]
Type II cassette 2 _ 1 +

(Sony UX-S) 0 9,000 Hz (.3 dB, IEO)

Type I cassette

(Sony HRS) 20- 17,000 Hz (:3 dB, IEC)

Wow and flutter

1: 0.05% W.Peak (IEC)
0.025% wnms (NAB)
: 0,07% W,Peak (DIN)

Model Name Using Similar Mecanism TC-K970ES
Tape Transport Mechanism Type TOM-20006
Inputs
Line inputs Sensitivity 77.5 mV
(phono IaCKSI Input impedance 47 k ohms

CD DIRECT INPUT

Outputs

Line outputs
(phono jacks)

0.44 V at a load
impedance of
47 k ohms

Rated output level

Load impedance Over 10 k ohms

Headphones (stereo Output level 0 - 2.5 mW at a load
phone jack) impedance of 32 ohms
General

Power requirements

Power consumption
Dimensions

Weight

Supplied accessory

220 - 230 V AC, (or 240 V AC
adjustable by Sony personnel),
50/60Hz

23 W

Approx. 430 x 135x 350 mm (w/h/d)
(17 x 5% x 137/8 inches)

including projecting pans and controls
Approx. 6.7 kg (14 lbs 13 02)

Audio connecting cord (2)

Design and specifications subject to change without notice.

STEREO CASSETTE DECK

SONK

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TC- K770ES

TABLE OF CONTENTS
Section Title Page
SPECIFICATIONS ...................... . .............. 1
1 GENERAL ......................................... 3
2. DISASSEMBLY ......... o . . ........................ 8
3. ADJUSTMENTS
3-1. Mechanical Adjustments ~~~~~~~~~~~~~~~~~~~~~~ 10
3-2. Electrical Adjustments ~~~~~~~ . ~ . . . - . . ~ ~ ~ . ~~~~~~ 13
4t DIAGRAMS
4.. 1 Description on K: ............ u... ........ .o. 18
4- 2. Circuit Boards Location ----------------------- 20
4-3. R: Block Diagrams .............. H... ...... NH 21
4_4 Block Diagrams ................. . . . ........ . . . . 23
4-5. Semiconductor Lead Layouts ~~~~~~~~~~~~~~~~~ 26
4- 6. Printed Wiring Boards - Main Section - ~~~~~ 27
4-7. Schematic Diagram - Main Section - ~ ~ ~
4-8r Schematic Diagram - Panel Section -
4-9. Printed Wiring Boards - Panel Section - ~ - - 39
5t EXPLODED VIEWS
5-1. Overall Section ~ ~ - - . 39
5-2. Panel Section ~- 40
5-3. Mechanism Section»l (TCM-ZOODS) ~ - . 41
5-4 Mechanism Section-2 (TCM-ZOODG) ---------- 42
6. ELECTRICAL PARTS LIST ~~~~~~~~~~~ . ~~~~~ ~ 48

SAFETY-RELATED COMPONENT WARNING! I

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.

For higher quality recording/playback

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

. B and C type Dolby NR systems which reduce tape
noise.

- Bias and recordlng level calibratlon which ensures
optimum recording conditions to bring out the best in every
tape.

- Three-head system (separate recording, playback and
erase heads) which allows you to instantly check the
recorded sound while recording is in progress

For your convenience

. The AMS and Memory Play functions which provide
easy access to a desired selection

~ Tlmer-actlvated playback and recording through the use
oI an optional timerl

For easier operallon
- Easy-to-read digltal linear counter which shows the
elapsed recording or playing time