Sony cfd 68 service manual

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SERVICE MANUAL

US Model

SPECIFICATIONS
AUDIO POWER SPECIFICATIONS (US model)

Full-range speakers:

With 3.2-ohm loads, both channels driven from
150-15000 Hz: rated 2.5 W per channel mini-
mum 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: GaAIAs
Wavelength 780 nm
Emission duration: Continuous
Laser output: less than 44.6 pW
This output is the value measured at a dis-
tance of about 200 mm lrom the objective
lens surface on the optical pick-up block.
Frequency response 20-20000 Hz 1? dB
Wow and flutter Below measurable limit

Radio section
Frequency range FM: 87.6-108 MHZ

AM: 530~1,710 kHz

Tape recorder section and general
Recording system 4~track 2-channel stereo

Frequency response 60-10900 Hz

(with TYPE I (NORMAL) cassette)
Speaker Full-range speakers: 10 cm dia., cone type
Power output
(Canadian model)

Full-range speakers: 2 W+2 W (at 3.2 ohms,
315 Hz, 10% harmonic distortion)

Model Name Using CD Section CFD~DW83

Similar Mechanism Tape Section NEW

Optical Device Name KSM-21OBAN
Tape Transport Mechanism Type MF-60-63
Inputs Mixing microphone input jack (minijack)
Sensitivity 2.5 mV
For low impedance microphone
Outputs Headphones jack (stereo minijack)

For 16-68 ohms impedance headphones
120 V AC, 60 Hz
DC 9 V, 6 size D (R20) batteries
Power consumption AC 20 W

Power requirements

Battery Iiie Batteries for radio cassette-corder (hours)
Recording Playback
Sony SUM-1 (NS) approx. 11 approx. 8
Sony Alkaline AM1 (N) approx. 17 approx. 12

593 x 175.5 x 197 mm (w/h/d)

(23% x 7 x 77/3 inches)

incl. projecting parts and controls

Weight Approx. 4.6 kg, incl. batteries
(Approx. 10 lb 2 oz)

Supplied accessories AC power cord (1)

Dimensions

Desrgn and specifications subject to change without notice.

an RADIO CASSETTE-BORDER
SONY®

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CFD-68

SAFETY CHECK-OUT

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

1. A commercial leakage tester, such as the
Simpson 229 or RCA WT manufacturers instructions to use these instru-
ments.

to

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 volt
meter. The limit indication is 0.75V, 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 2V AC range are
suitable. (See Fig. A)

To Exposed Metal

Part: on Set

AC
0.75ILF €75! voltmeter
' (0.75Vl

;__J

"7' Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.

TABLE OF CONTENTS

Section Title Page
Specifications ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1
Safety Check-out ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2
1. SERVICING NOTES

Notes on Handling the Optical Pickup

Block or Base Unit ~~~~~~~~~~~~~~~~~~~~~~~ 3

Notes on Laser Diode Emission Check ~~~~~ 3

Laser Diode and Focus Search

Operation Check ......................... 3

Chuck Plate Jig on Repairing ~ 3
Note on Repairing .................... 3
2. GENERAL ............................. 4
3. DISASSEMBLY ......................... 4
4. ADJUSTMENTS
4-1. Mechanical Adjustment ~~~~~~~~~~~~~~~ 6
4-2 Electrical Adjustment . . . . 5
Tape Recorder Section ~~~~~~~~~~~~~~~~~~~~ 7
Radio Section -------------------------- 8
CD Section .............................. 9

5. DIAGRAMS

5-1. CD Section Block Diagram ~~~~~~~~~~~~~~~ 13
5-2. Radio, Audio Section Block Diagram

S»3. Radio, Audio Section Printed Wiring Boards - 17
5-4. Radio, Audio Section Schematic Diagram ~ 21
5-5. CD Section Schematic Diagram ~~~~~~~~~~~~~ 25
5-6. CD Section Printed Wiring Boards --------- 29
6. EXPLODED VIEWS ~~~~~~~~~~~~~~~~~~~~ 31
7. ELECTRICAL PARTS LIST vvvvvvvvvv 36

SAFETY-RELATED COMPONENT WARNING

COMPONENTS IDENTIFIED av MARK A on DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONv PARTS WHOSE PART NUMBERS APPEAR As
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
ATTENTION AU COMPOSANT AVANT RAPPORT
A LA SECURITEI

LES COMPOSANTS IOENTIFIES PAR UNE MAROUE A
SUR LES DIAGRAMMES SCHEMATIOUES ET LA LISTE
OEs PIECES SONT CRITIQUES POUR LA SECURITE
DE FONCTIONNEMENT. NE REMPLACER CEs COMA
POSANTS OUE PAR DES PIECES SONv DONT LES
NUMERos SONT DONNES DANS CE MANUEL 0U
DANS LES SUPPLEMENTS PUELIES PAR SONv.