Sony dxac 70 service manual

Page 1

DXA-CII]

US Model
Canadian Model
AEP Model

UK Model

E Model
Australian Model
Tourist Model

SERVICE MANUAL

This set is the Ampliiier.
cassette deck section
in MHCA70 and FHIC7X.

Amplifier Section

(For US, Canda)

Continuous RMS power outut
50 + 50 watts (6 omits at
40 Hz ~20 kHz, 0.9%
THD) 65 + 65 watts
(6 ohms at I KHZ, 5%
THD)

(For AEP, UK, German and Italy)

Continuous FtMS power output
40 + 40 watts (6 ohms at
1 kHz, DIN)
45 + 45 watts (6 ohms at
tkHz, 5% THD)

Music power output 110 + 110 watts
(6 ohms at tkHz, 10%
THD)

(For Australia)

Continuous HMS power output
50 + 50 watts (6 ohms at
ikHz, 5% THD)

Peak music power output
600 watts (4 speakers
driven)

Tape deck

Model Name Using Similar Mechanism

HOD-H61
HOD-H61 M

Type

Section Tape Transport Mechanism DECK A TCM-l SORAI 2A

DECK B TCM-I SORBZZA

SPECIFICATIONS

(For E, Saudi Arabia. Singapore and Tourist)
Peak music power output
600 watts (4 speakers driven)
ContinUOUs HMS power output
50 + 50 watts (6 ohms at
1 kHz, 5% THD)
inputs MIX MIC (mini jack):
sensitivity imv,
Impedance 47 kilohms
(Except US, Canda)
PHONO iN (Phonojacks):
sensitivity 3 mV.
impedance 47 kilohms
(AEP, UK, German, itaiy)
VIDEO iN (phono jacks):
sensitivity 250 mV,
impedance 47 kilohms
(us, Canada, FH-C7X)
M D/DAT IN (phone jacks):
sensitivity 250 mV,
impedance 47 kiioh ms
Outputs HEADPHONES
(stereo miniiack):
accepts headphones of
8 ohms or more

SPEAKERS:
aocepts speakers or 6 to
1 6 ohms
MD/DAT OUT (phone jacks):
voltage 250 my
impedance 1 kilohm
cassette Dock Section

Reoording system 4-track 2-ohannei setereo

Frequency response (oomv NR OFF)

40 -13,000 Hz (23 dB),
using TYPE I cassette
(Sony HF-S)

40 - 14,000 Hz (:3 dB),
using TYPE || cassette
(Sony ux-s or ux)

40 -15,000 Hz (13 dB),
Using TYPE IV cassette
(Sony ES-iV) (US, Canada)
(Sony METAL-S) (Except
US, Canada)

Wow and flutter 01% WRMS i 0.3% (DIN)

Design and specifications subject to change

without notice.

Dolby noise reduction manufactured under license from Dolby
Laboratories Licensing Corporation.

DOLBY and the double-D symbol DU are trademarks of Dolby
Laboratories Licensing Corporation

MINI Hi-Fi COMPONENT SYSTEM

SONE

Page 2

SAFETY CHECK-OUT

After correcting the original service problem, SONY; MODEL NO.DXA-C70
STEREO CASSETTE DECK AMPLIFIER
W

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 SERIAL NO.
MADE IN JAPAN

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

US model: AC: 120 V 60 Hz 135W
Canadian model: AC: 120 V 60 Hz 145 W

not exceed 0.5 mA (500 microampers). Leakage AEp model: Ac;220-230V ~5o/son 135w
current can be measured by any one of three German, Italian model:AC:220-230V ~50 Hz 135W
methods. E, Saudi Arabia, Singapore,

Australian, Tourist model: Ac: 120/220/230-240 v ~ 50/60 Hz 165 w
1, A commercial leakage tester, such as the UKmodel:AC:240V ~50 Hz

Simpson 229 or RCA WT-540A. Follow the
manufacturers instructions to use these instru-
ments.

2. A batteryvoperated 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 batteryvoperated AC volt-

meter. The limit indication is 0i75 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)

SAFETY-RELATED COMPONENT WARNING
COMPONENTS IDENTIFIED BY MARK A OR DOTTED
LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS
ToEXposedMeta/ AND IN THE PARTS LIST ARE CRITICAL TO SAFE
Partson Set OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-

fl LISHED av souv.
AC
0. mm I g 7.5m / voltmeter

(075 V) ATTENTION AU CDMPOSANT AVANT RAPPORT

. A LA sécumré!
~-J LES COMPOSANTS IDENTIFIES PAR UNE MARQUE A

sun LES DIAGRAMMES SCHEMATIOUES ET LA LISTE
DES PIECES SONT CRITIQUES POUR LA sécumré
DE FONCTIONNEMENT. NE REMPLACER ces COM-
POSANTS our: PAR DES PIECES SONY DONT LES
NUMEROS SONT DONNES DANS cs MANUEL ou
DANS LES SUPPLEMENTS PUBLIES PAR soNv.

? Earth Ground

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