Sony dtc 670 service manual

Page 1

DTC-670

SERVICE MANUAL us Model

Canadian Model
AEP Model

SPECIFICATIONS Model Name Using Similar Mechanism DTC-57ES
Tape Digital audio tape Tape Transport Mechanism Type DATM-lOO
Recording head Rotary head
Recording time Standard: 120 minutes.
Long-play mode: 240 minutes .
(with 012120) WOW and flutter
Tape speed Standard: 8.15 mm/s,
Long play mode: 4075 mm/s I
Drum rotation Standard: 2,000 r m, "P" .
Long-play mode: I3.000 rpm Jack type Impedance Rated Input level
Error correction Double Read Solomon code LINE IN phono jack 47 kohms .4 (ms
Tape . 0
Track DIICI'I 13.6 I'm (204 pm) DIGITAL IN phono tack 75 ohms 0.5 Vp-p. 20%:
Sampling frequency 48 kHz, 44.1 kHz. 32 kHz .
Modulation system 8-10 Modulation DIGITAL N optical rack - -
Transfer rate 246 Mbit/sec.
Number of channel 2 channels. stereo Out ut
D/A converston (Quantizatioraandard 16 bit linear p Jack W99 Impedance Rated Load
' ' t im dance
Long-play mode: 12vbit outpu pe
non-linear -
h More than
Frequency response StargdBard: 2-22,000 Hz (:05 LINE OUT phono JaCk 470 0 ms _4 dBS iO kohms
Longglgydrétfde: 2-14500 HZ PHONES stereo 220 ohms 1.3 mW 32 ohms
Signal to noise ratio Standard: more than 90 dB phone IaCK
L°d9ép'ay "me: 0; than 90 DIGITAL our (optical jack): wavelength 660 nm
Dynamic range Standard: more than 90 dB
Long-play mode: more than 90
dB
Total harmonic distortion Standard: less than 0.005% (1 - continued on next page -

kHz)

H DIGITAL AUDIO TAPE DECK
Below measurable limit
SONY;

Page 2

DTC-670

General

Power requirements 120V AC, 60Hz

(US, Canadian model)
220 - 230V AC, 50/60Hz

(AEP, Germany model)

Power consumption 32 W
Dimensions Approx, 430x125x350 mm
(w/h/d)
(17 x 5 x 13 7/8 inches)
Weight Approx. 7 kg (15 lb 14 oz)

Remote commander (supplied)

Remote control system infrared control

Power requirements 3V DC, with two size AA (R6)
batteries

Dimensions Approx. 63x19x175 mm (th/d)
(2 /Z x 3/4 x 7 inches)
Weight Approx. 130 g (4 oz) incl.

batteries.

Supplied accessories

Sony batteries SUM-3(NS) (2)

Audio connecting cords (2 phono plugs - 2 phono plugs,
stereo for line inputs and outputs) (2)

Design and specifications subject to change without notice.

SAFETY-RELATED COMPONENT WARNINGII

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 PUBLISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT
A LA SECURITEI

LEs COMFOSANTS IDENTIFIES PAR UNE MAROUE A sun
LEs DIAGRAMMES SCHEMATIouEs ET LA LISTE DEs PIECES
SONT CRITIQUES POUR LA sEcumTE DE FONCTIONNE-
MENT. NE REMPLACER SES COMPOSANTS ouE PAR DES
PIECES SONY DONT LES NUMERos SONT DoNNEs DANS
CE MANUEL ou DANS LEs SUPPLEMENTS PUBLiEs PAR
SONY.

TABLE OF CONTENTS
Section Etta Bags
1. GENERAL
Features ................................................................... 3
Location and Function of Controls ............................ 4
Connections .............................................................. 5
2. DISASSEMBLY ....... .. ...................................... 7
3. ADJUSTMENTS .............................................. 10
3-1. Electrical Adjustments .................................... 12

4. DIAGRAMS
4-1. Circuit Boards Location
4-2. Block Diagram
4-3. Waveforms ..
4-4. Semiconductor Lead Layouts ......................... 21

4-5. Printed Wiring Boards

- MD / Power supply/ Display section - .......... 23
4-6. Schematic Diagram

- MD / Power supply/ Display section - .......... 27
4-7. Printed Wiring Boards

- Main section - ............................................... 32
4-8. Schematic Diagram

- Main section .. 35

4-9. lC Block Diagrams. ..
4-10. Pin Functions .................................................. 43
5. EXPLODED VIEWS
5-1. Cabinet Section .....
5-2. Front Panel Section
5-3. Chassis Section .....
5-4. Mechanism Section 1
5-5. Mechanism Section 2
5-6. Mechanism Section 3
5-7. Mechanism Section 4 ..................................... 57

6 . ELECTRICAL PARTS LIST ..................... . ...... 58

short an adjacent terminal while destroying the device.

PRECAUTIONS FOR INSPECTIONS AND REPAIR WITH POWER OFF

Before beginning repair work after turning OFF the main switch, be sure to first remove CN932 (EH8P) of the power
board. When assembling the equipment, be sure to plug this connector last.

This is because, even with the main switch turned OFF, electric charges still remain in the smoothing capacitor in
the power board. Therefore, if another flexible board is inserted or removed, a terminal of the power supply may