CFD-G70 — Sony Audio Service Manual (repair manual)

Model
CFD-G70
Pages
52
Size
4.7 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cfd-g70.pdf
Date

View Sony CFD-G70 Service Manual online

CFD-G70
SERVICE MANUAL
CD RADIO CASSETTE-CORDER
SPECIFICATIONS
US Model
Canadian Model
E Model
Model Name Using
CD Section
CFD-S40CP
Similar Mechanism
Tape Section
CFD-S40CP
CD Mechanism Type
KSM-213CDP
Optical Pick-up Type
KSS-213C
Tape Transport Mechanism Type
MF-V5-117
– Continued on page 2 –
Ver. 1.4  2005.09
With SUPPLEMENT-1
AUDIO POWER SPECIFICATIONS (US Model)
POWER OUTPUT AND TOTAL HARMONIC DISTORTION
Main speaker 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.
Subwoofer with 4-ohm loads, driven at 50 - 150 Hz; rated 6 W
minimum RMS power, with no more than 10 % total harmonic
distortion in AC operation.
GAME Xpand with 12-ohm loads, driven at 3,000 - 10,000 Hz;
rated 1 W per channel minimum RMS power, with no more than
10 % total harmonic distortion in AC operation.
Other Specifications
CD player section
System
Compact disc digital audio system
Laser diode properties
Material: GaAlAs
Wave length: 780 nm
Emission duration: Continuous
Laser output: Less than 44.6 
µW
(This 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.)
Spindle speed
200 r/min (rpm) to 500 r/min (rpm) (CLV)
Number of channels
2
Frequency response
20 - 20,000 Hz +1/–2 dB
Wow and flutter
Below measurable limit
Radio section
Frequency range
FM: 87.6 - 108 MHz
AM: 530 - 1,710 kHz
Antennas
FM: Telescopic antenna
AM: Built-in ferrite bar antenna
Cassette-corder section
Recording system
4-track 2 channel stereo
Fast winding time
Approx. 120 sec. with Sony cassette C-60
Frequency response
TYPE I (normal): 70 - 13,000 Hz
General
Speakers
Main speaker: 10 cm (4 in.) dia., 3.2 
Ω, cone type (2)
Subwoofer: 8 cm (3 
1 ⁄4
 in.) dia., 4 
Ω, cone type (1)
GAME Xpand: 5 cm (2 in.) dia., 12 
Ω, cone type (2)
Inputs
LINE IN jack (stereo minijack): sensitivity 436 mV
Outputs
Headphones jack (stereo minijack): for 16 - 68 
impedance headphones
9-873-132-15
2005I02-1
© 2005.09
Sony Corporation
Personal Audio Group
Published by Sony Engineering Corporation
2
CFD-G70
SAFETY-RELATED COMPONENT WARNING!!
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.
TABLE OF CONTENTS
Specifications ............................................................................... 1
1. SERVICING NOTES
...................................................... 3
2. GENERAL
Location and Function of Controls ....................................... 5
3. DISASSEMBLY
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. ADJUSTMENTS
4-1.   Mechanical Adjustments ............................................ 13
4-2.   Electrical Adjustments ............................................... 13
5. DIAGRAMS
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. EXPLODED VIEWS
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
7. ELECTRICAL PARTS LIST
...................................... 44
ATTENTION AU COMPOSANT AYANT RAPPORT
 À LA SÉCURITÉ!!
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.
3
CFD-G70
 NOTES ON HANDLING THE OPTICAL PICK-UP
 BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electro-
static 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.
NOTES ON LASER DIODE EMISSION CHECK
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.
 CHUCK PLATE JIG ON REPAIRING
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
SECTION 1
SERVICING NOTES
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
1. Press CD open knob.
2. Open the lid for CD.
3. Push on SWITCH (S801) as following figure.
4. 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 once for the focus
search.
To Exposed Metal
Parts on Set
0.15
µF
1.5k
AC
voltmeter
(0.75V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
SAFETY  CHECK-OUT (US model)
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 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 pas-
sive VOM that is suitable. Nearly all battery operated digital
multimeters that have a 2V AC range are suitable. (See Fig. A)
Insert a precision 
screw driver and push  
SWITCH (S801)
4
CFD-G70
• Service Position
Note: For removal, a screwdriver with the long shaft 25cm or more is required.
Repair without removing Headphone board.
Cabinet (front) ASSY
Tuner board
Cabinet top ASSY
Main board
Cabinet (rear) ASSY
5
CFD-G70
SECTION 2
GENERAL
LOCATION AND FUNCTION OF CONTROLS
This section is extracted from
instruction manual.
1 Tape operation buttons
REC  z
PLAY N
REW m
FF M
STOP/EJECT x/Z
PAUSE X
2 PRESET – button
3 PRESET + button
4 CD u  button
5 CD x button
6 VOLUME –/+ button
7 Z PUSH  OPEN/CLOSE
8 GAME/LINE button
9 GAME Xpand button
0 MODE button
qa SOUND button
qs RADIO BAND/AUTO PRESET button
qd POWER DRIVE WOOFER button
qf CD: AMS > button
Radio: TUNE + button
qg CD: AMS . button
Radio: TUNE – button
qh Remote sensor
qj Display window
qk GAME/LINE IN jack
ql i jack
w; OPR/BATT indicator
wa DISPLAY ENT/MEMORY button
ws POWER button
wd SLEEP button
0
8
9
qa
qh
qd
qj
qk
ql
qs
qf
qg
wd
w;
wa
ws
1
6
23 45
7

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Here you can view online or download Sony CFD-G70 Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sony CFD-G70 Audio. Information contained in Sony CFD-G70 service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).