CFD-G70 - Sony Audio Service Manual (repair manual). Page 2

2

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH
MARK 0 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.

Specifications ............................................................................... 1

...................................................... 3

Location and Function of Controls ....................................... 5

3-1.   Cabinet (Front) ASSY, Cabinet (Rear) ASSY ............. 6
3-2.   Control-1 Board, Control-2 Board .............................. 7
3-3.   Headphone Board ........................................................ 7
3-4.   Cabinet (Top) ASSY .................................................... 8
3-5.   LCD Board .................................................................. 8
3-6.   AC Inlet Board, Power Board, VOL SEL Board ......... 9
3-7.   Tuner Board ................................................................. 9
3-8.   BATT Board, BATT COM Board .............................. 10
3-9.   Main Board ................................................................ 10
3-10. CD Board, TC Board, Optical Pick-up Block,

Mechanism Deck ....................................................... 11

3-11. M321 (Capstan/Reel Motor), Belt,

HRP301 Head, Magnetic (Record/Playback),
HE301 Head (Erase) .................................................. 11

3-12. Optical pick-up (KSS-213C) ..................................... 12

4-1.   Mechanical Adjustments ............................................ 13
4-2.   Electrical Adjustments ............................................... 13

5-1. Explanation of IC Terminals ...................................... 17
5-2. Block Diagram – Tuner/TC Section – ....................... 19
5-3. Block Diagram – Main Section – .............................. 20
5-4. Block Diagram – CD Section – ................................. 21
5-5. Printed Wiring Board – Tuner Section – ................... 22
5-6. Schematic Diagram – Tuner Section – ...................... 23
5-7. Printed Wiring Board – CD Section – ....................... 24
5-8. Schematic Diagram – CD Section – .......................... 25
5-9. Printed Wiring Board – TC Section – ........................ 26
5-10. Schematic Diagram – TC Section – .......................... 26
5-11. Printed Wiring Board – Main Section – .................... 27
5-12. Schematic Diagram – Main Section (1/2) – .............. 28
5-13. Schematic Diagram – Main Section (2/2) – .............. 29
5-14. Printed Wiring Board – Control Section – ................ 30
5-15. Schematic Diagram – Control Section – ................... 31
5-16. Printed Wiring Board – Power Supply Section – ...... 32
5-17. Schematic Diagram – Power Supply Section – ......... 33

6-1.   Cabinet (Front) Assy .................................................. 38
6-2.   Cabinet (Rear) Assy ................................................... 39
6-3.   Cabinet Top Assy ....................................................... 40
6-4.   Mechanism Deck Section (1) .................................... 41
6-5.   Mechanism Deck Section (2) .................................... 42
6-6.   Optical Pick-up Block Section .................................. 43

...................................... 44

LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE  DES
PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE
FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT
DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.

Power output

Main speaker: 4 W + 4W (at 3.2 

Ω, 10 % harmonic

distortion in DC operation)
Subwoofer: 12 W (at 4 

Ω, 10 % harmonic distortion in

DC operation)
GAME Xpand: 1.2 W + 1.2 W (at 12 

Ω, 10 % harmonic

distortion in DC operation)

Power requirements

For CD radio cassette-corder:
120 V AC, 60 Hz
12 V DC, 8 size D (R20) batteries
For remote control:
3 V DC, 2 size AA (R6) batteries

Power consumption

AC 35 W

Battery life

For CD radio cassette-corder:
FM recording
Sony R20P: approx. 8 h
Sony alkaline LR20: approx. 18 h
Tape playback
Sony R20P: approx. 1.5 h
Sony alkaline LR20: approx. 6 h
CD playback
Sony R20P: approx. 1 h
Sony alkaline LR20: approx. 4 h

Dimensions

Approx. 530 

× 193 × 345 mm (w/h/d)

(20 

7 ⁄8

 

× 7 

5 ⁄8

 

× 13 

5 ⁄8

 inches) (incl. projecting parts)

Mass

Approx. 7 kg (15 lb. 5 oz) (incl. batteries)

Supplied accessories

AC power cord (1)
Remote control (1)
AV connecting cord (1)
Audio connecting cord (1)

Design and specifications are subject to change without
notice.

Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270°C during

repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

Notes on Chip Component Replacement
• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.