CFD-G700CP, CFD-G770CP, CFD-G770CPK - Sony Audio Service Manual (repair manual)

US Model

CFD-G700CP

Canadian Model

CFD-G770CPK

E Model

CFD-G770CP/G770CPK

Australian Model

CFD-G770CPK

2009B00-1
© 2009.02

Model Name Using Similar Mechanism

CFD-G505/G555CP/G555CPK

CD

CD Mechanism Type

KSM-213CDP/C2NP

Section

Optical Pick-up Type

KSS-213C

TAPE

Model Name Using Similar Mechanism

HCD-EC50

Section

Tape Transport Mechanism Type

H21SB-C05

POWER OUTPUT AND TOTAL HARMONIC
DISTORTION
With 3.2-ohm loads, both channels driven from
1 000 - 10 000 Hz; rated 3 W per channel-minimum
RMS power, with no more than 10 % total harmonic
distortion in AC operation.
Woofer with 4-ohm loads, driven from 50 - 150
Hz; rated 6 W minimum RMS power, with no more
than 10 % total harmonic distortion in AC
operation.

System

Compact disc digital audio system

Laser diode properties

Emission duration: Continuous
Laser output: Less than 44.6 

µ

W

(Th is output is the value measured at a distance
of about 200 mm from the objective lens surface
on the optical pick-up block with 7 mm
aperture.)

Number of channels

2

Frequency response

20 - 20 000 Hz +1/–2 dB

Wow and fl utter

Below measurable limit

Frequency range

FM: 87.5 - 108 MHz
AM: 530 - 1 710 kHz
   (G700CP: US/G770CPK: CND, MX, E92)
AM: 531 - 1 611 kHz (G770CPK: AUS)
AM: 531 - 1 611 kHz (9 kHz step)(G770CP)
AM: 530 - 1 610 kHz (10 kHz step)(G770CP)

Antennas

FM: Telescopic antenna
AM: Built-in ferrite bar antenna

Recording system

4-track 2 channel stereo

Fast winding time

Approx. 150 s (sec.) with Sony cassette C-60

Frequency response

TYPE I (normal): 70 - 13 000 Hz

Speaker

Full range: 10 cm (4 in.) dia., 3.2 

Ω

,

   cone type (2)
Woofer: 13 cm (5 1/8 in.) dia., 4 

Ω

,

   cone type (1)
Tweeter: 2 cm (13/16 in.) dia. (2)

Input

Built-in audio cable with stereo-mini plug:
   Minimum input level 245 mV
AUDIO IN Jack (stereo minijack):
   Minimum input level 245 mV
MIC MIX (microphone) jack (monaural minijack):
    Sensitivity 2.5 mV, for low impedance
   microphone
   Minimum input level 2.5 mV (G770CPK)

Outputs

Headphones jack (stereo minijack)
For 16 - 68 

Ω

 impedance headphones

Power output

4 W + 4 W (at 3.2 

Ω

, 10% harmonic distortion)

Woofer:
12 W (at 4 

Ω

, 10% harmonic distortion)

Power requirements

For CD radio cassette-corder:
120 V AC, 60 Hz
   (G700CP: US/G770CPK: CND, MX, E92)
230 - 240 V AC, 50 Hz (G700CP: SP)
230 V AC, 50 Hz
   (G700CP: E41/G770CPK: AUS)
12 V DC, 8 R20 (size D) batteries
For remote control:
3 V DC, 2 R6 (size AA) batteries

Power consumption

AC 28 W

Photo : CFD-G770CPK

— Continued on next page —

•

Abbreviation
AUS

: Australian model

CND

: Canadian model

E41

: AC 230V area in E model

E92

: AC 120V area in E model

MX

: Mexican model

SP

: Singapore model

2

Battery life

For CD radio cassette-corder:

FM recording
Sony R20P: approx. 6 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. 551 

×

 247 

×

 370 mm (w/h/d)

(21 

3

/

4

 

×

 9 

3

/

4

 

×

 14 

5

/

8

 inches) (incl. projecting parts)

Mass

Approx. 8.4 kg (18 lb. 9 oz) (incl. batteries)

Supplied accessories

AC power cord (1)
Remote control (1)

Design and specifications are subject to change without
notice.

•

Never reuse a disconnected chip component.

•

Notice that the minus side of a tantalum capacitor may be
damaged by heat.

•

Keep the temperature of 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.

Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

Unleaded solder has the following characteristics.

•

Unleaded solder melts at a temperature about 40 

°

C higher

than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 

°

C.

Caution: The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

•

Strong viscosity
Unleaded solder is more viscou-s (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

•

Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

0

0

0

3

...............................................

4

...................................................................

5

3-1.

Disassembly Flow ........................................................... 11

3-2.

Cabinet (Upper) (1) Section ............................................ 12

3-3.

Cabinet (Upper) (2) Section ............................................ 12

3-4.

Cabinet (Front) Section ................................................... 13

3-5.

LCD Board, AUDIO IN Board, HEADPHONE Board,
POWER KEY Board, MICROPHONE Board
(CFD-G770CPK), VOLUME KEY Board ...................... 13

3-6.

Front Panel ...................................................................... 14

3-7.

LED Board ...................................................................... 14

3-8.

Speaker (13cm) ................................................................ 15

3-9.

Speaker (10cm) ................................................................ 15

3-10. POWER Board, BATTERY Board,

D-LIGHT Board (CFD-G700CP) ................................... 16

3-11. WOOFER KEY Board, CD KEY Board ......................... 17
3-12. TUNER Board ................................................................. 17
3-13. Tape Mechanism Deck .................................................... 18
3-14. MAIN Board .................................................................... 18
3-15. CD Block Section ............................................................ 19
3-16. Optical Pick-up (KSM-213CDP/C2NP) ......................... 19
3-17. TC Board ......................................................................... 20
3-18. Main Belt, Sub Belt ......................................................... 20

............................................................... 21

......................... 23

.......................... 23

7-1.

Block Diagram  – TUNER/CD Section – ....................... 28

7-2.

Block Diagram  – MAIN Section – ................................. 29

7-3.

Printed Wiring Board  – BD90 Board – .......................... 30

7-4.

Schematic Diagram  – BD90 Board – ............................. 31

7-5.

Printed Wiring Board  – TUNER Board – ....................... 32

7-6.

Schematic Diagram  – TUNER Board – ......................... 33

7-7.

Printed Wiring Board  – TC Board – ............................... 34

7-8.

Schematic Diagram  – TC Board – ................................. 35

7-9.

Printed Wiring Board  – MAIN Board – ......................... 36

7-10. Printed Wiring Boards  – AUDIO Section – .................... 37
7-11. Printed Wiring Boards  – CONTROL Section – ............. 38
7-12. Schematic Diagram  – MAIN (1/3), AUDIO Section – .. 39
7-13. Schematic Diagram  – MAIN Section (2/3) – ................. 40
7-14. Schematic Diagram

– MAIN (3/3), CONTROL Section – .............................. 41

7-15. Printed Wiring Boards  – POWER Section – .................. 42
7-16. Schematic Diagram  – POWER Section – ...................... 43

8-1.

Overall Section ................................................................ 51

8-2.

Cabinet (Front) Section ................................................... 52

8-3.

Cabinet (Rear) Section .................................................... 53

8-4.

Cabinet (Upper) Section-1 ............................................... 54

8-5.

Cabinet (Upper) Section-2 ............................................... 55

8-6.

Tape Mechanism Deck Section ....................................... 56

.................................. 57

4

The laser diode in the optical pick-up block may suffer electrostatic
breakdown because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic breakdown and also use
the procedure in the printed matter which is included in the repair
parts.
The flexible board is easily damaged and should be handled with
care.

The laser beam on this model is concentrated so as to be focused on
the disc reflective surface by the objective lens in the optical pick-
up block. Therefore, when checking the laser diode emission,
observe more than 30 cm away from the  objective lens.

On repairing CD section, playing a disc without the CD lid, use
Chuck Plate Jig.

•

Code number of Chuck Plate Jig : X-4918-255-1

1. Turn ON the [POWER] button.
2. Open the CD lid.
3. Turn on SW2 with screwdriver, etc. as following figure.
4. Press the  u  (CD) button.
5. Confirm the laser diode emission while observing the objecting

lens. When there is no emission, Auto Power Control circuit
or Optical Pick-up is broken.
Objective lens moves up and down three times for focus search.

SW2

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.

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 microamperes.).
Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’ instructions to use these
instruments.

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 voltmeter. The “limit” indication
is 0.75 V, 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 2 V AC range are suitable.  (See
Fig. A)

1.5 k

Ω

0.15 

µ

F

AC
voltmeter
(0.75 V)

To Exposed Metal
Parts on Set

Earth Ground

This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.

Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.