HCD-BX2, HCD-DX2, HCD-DX2B, MHC-BX2, MHC-DX2, MHC-DX2B - Sony Audio Service Manual (repair manual)

US Model

Canadian Model

AEP Model

UK Model

HCD-BX2

E Model

HCD-DX2/DX2B

Australian Model

HCD-DX2

HCD-BX2/DX2/DX2B is the Amplifier,
CD player, Tape Deck and Tuner
section in HMC-BX2/DX2/DX2B.

Photo: HCD-BX2

Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol 

;

 are trade-

marks of Dolby Laboratories Licensing Corporation.

Model Name Using Similar Mechanism

NEW

CD Mechanism Type

EXL-M7

Optical Pick-up Name

OPTIMA-7

Model Name Using Similar Mechanism

HCD-GRX20

Tape Transport Mechanism Type

CWL-44-FR

CD
Section

Tape deck
Section

POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:

with 6 ohm loads both channels driven, from
120 – 10,000 Hz; rated 60 watts per channel
minimum RMS power, with no more than
10% total harmonic distortion from
250 milliwatts to rated output.

Canadian model:
Continuous RMS power output

50 + 50 watts
(6 ohms at 1 kHz,
10% THD)

European model:
DIN power output (Rated)

40 + 40 watts
(6 ohms at 1 kHz, DIN)

Continuous RMS power output (Reference)

50 + 50 watts
(6 ohms at 1 kHz,
10% THD)

Music power output (Reference)

100 + 100 watts
(6 ohms at 1 kHz,
10% THD)

Other models:
The following measured at AC 110, 220 V 60 Hz:
DIN power output (Rated)

45 + 45 watts
(6 ohms at 1 kHz, DIN)

Continuous RMS power output (Reference)

50 + 50 watts
(6 ohms at 1 kHz,
10% THD)

The following measured at AC 120, 240 V 60 Hz:
DIN power output (Rated)

50 + 50 watts
(6 ohms at 1 kHz, DIN)

Continuous RMS power output (Reference)

60 + 60 watts
(6 ohms at 1 kHz,
10% THD)

Inputs
MD IN:

voltage 450 mV,

(phono jacks)

impedance 47 kilohms

Outputs
PHONES:

accepts headphones of

(stereo mini jack)

8 ohms or more

SPEAKER:
HCD-BX2:

accepts impedance of 6 to
16 ohms

HCD-DX2:

accepts impedance of 6 to
16 ohms

System

Compact disc and digital
audio system

Laser

Semiconductor laser
(

λ

=780nm)

Emission duration:
continuous

Laser output

Max. 44.6 

µ

W*

*This output is the value
measured at a distance of
200 mm from the
objective lens surface on
the Optical Pick-up Block
with 7 mm aperture.

Wavelength

780 – 790 nm

Frequency response

20 Hz – 20 kHz (±0.5 dB)

Signal-to-noise ratio

More than 90 dB

Dynamic range

More than 90 dB

CD OPTICAL DIGITAL OUT
(Square optical connector jack, rear panel)
Wavelength

660 nm

Output Level

–18 dBm

Recording system

4-track 2-channel stereo

Frequency response

40 – 13,000 Hz (±3 dB),
using Sony TYPE I
cassette

FM stereo, FM/AM superheterodyne tuner

Tuning range                       87.5 – 108.0 MHz
Antenna

FM lead antenna

Antenna terminals

75 ohm unbalanced

Intermediate frequency

10.7 MHz

Tuning range
Pan-American model:

530 – 1,710 kHz
(with the interval set at
10 kHz)
531 – 1,710 kHz
(with the interval set at
9 kHz)

European and Middle Eastern models:

531 – 1,602 kHz
(with the interval set at
9 kHz)

Other models:

531 – 1,602 kHz
(with the interval set at
9 kHz)
530 – 1,710 kHz
(with the interval set at
10 kHz)

Antenna

AM loop antenna

Antenna terminals

External antenna terminal

Intermediate frequency

450 kHz

– Continued on next page –

2002J0500-1

C

 2002.10

2

0

0

0

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

3

Location of Controls .......................................................

4

Setting the Time ..............................................................

5

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

6

4-1. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 13

4-2. Schematic Diagram  – CD Section (1/4) – ..................... 14
4-3. Schematic Diagram  – CD Section (2/4) – ..................... 15
4-4. Schematic Diagram  – CD Section (3/4) – ..................... 16
4-5. Schematic Diagram  – CD Section (4/4) – ..................... 17
4-6. Printed Wiring Boards  – CD Section – ......................... 18
4-7. Printed Wiring Boards  – MAIN/TR Boards – ............... 19
4-8. Schematic Diagram  – MAIN Board (1/4) – .................. 20
4-9. Schematic Diagram  – MAIN Board (2/4) – .................. 21
4-10. Schematic Diagram  – MAIN Board (3/4) – .................. 22
4-11. Schematic Diagram

– MAIN (4/4)/TR Boards – ............................................ 23

4-12. Schematic Diagram  – PANEL Section (1/3) – .............. 24
4-13. Schematic Diagram  – PANEL Section (2/3) – .............. 25
4-14. Schematic Diagram  – PANEL Section (3/3) – .............. 26
4-15. Printed Wiring Board  – PANEL Section – .................... 27
4-16. Printed Wiring Board  – AMP Board

(US, Canadian, AEP, UK, Australian models) – ............ 28

4-17. Schematic Diagram  – AMP Board

(US, Canadian, AEP, UK, Australian models) – ............ 29

4-18. Printed Wiring Boards

– AMP (E model)/AC/FUSE Boards – ........................... 30

4-19. Schematic Diagram

– AMP (E model)/AC/FUSE Boards – ........................... 31

................................................ 37

............................... 43

Power requirements
North American model:

120 V AC, 60 Hz

European model:

230 V AC, 50/60 Hz

Australian model:

220 – 240 V AC, 50/60 Hz

Mexican model:

120 V AC, 50/60 Hz

Other models:

110 – 120 V or 220 – 240 V
AC, 50/60 Hz
Adjustable with voltage
selector

Power consumption
U.S.A. model:

110 watts

Canadian model:

120 watts

European model:

105 watts

Other model:

120 watts

Dimensions (w/h/d)

Approx. 280 x 325 x 418 mm

Mass
U.S.A. model:

Approx. 8.1 kg

Canadian model:

Approx. 8.1 kg

European model:

Approx. 8.2 kg

Other model:

Approx. 8.3 kg

Supplied accessories:

AM loop antenna (1)
FM lead antenna (1)
Remote Commander (1)

Design and specifications are subject to change
without notice.

CAUTION

Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.

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

3

The laser diode in the optical pick-up block may suffer electro-
static break-down because of the potential difference generated
by the charged electrostatic load, etc. on clothing and the human
body.
During repair, pay attention to electrostatic break-down 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 emis-
sion, observe from more than 30 cm away from the objective lens.

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

• Keep the temperature of the soldering iron around 270 ˚C dur-

ing 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.

Model

Power Voltage Indication

US model

AC: 120 V - 60 Hz 110 W

Canadian model

AC: 120 V - 60 Hz 120 W

AEP, UK models

AC: 230 V - 50/60 Hz 105 W

Australian model

AC: 220 – 240 V - 50/60 Hz 120 W

Mexican model

AC: 110 – 120 V - 50/60 Hz 120 W

Other models

AC: 110 – 120 V/220 – 240 V - 50/60 Hz 120 W

4

1

TIMER indicator

2

STANDBY ?/1 button and indicator

3

DISPLAY button

4

SPECTRUM button

5

GROOVE button and indicator

6

FILE SELECT button

7

PHONES jack

8

ENTER button

9

– . button

0

x button

qa

g G button and indicator

qs

X button

qd

> + button

qf

PLAY MODE, DIRECTION button

qg

REPEAT, STEREO/MONO button

qh

EDIT, TUNER MEMORY button

qj

VOLUME knob

qk

j J button

ql

REC button and indicator

w;

REC PAUSE button and indicator

wa

CD SYNC button

ws

DISC SKIP EX-CHANGE button

wd

MD button and indicator

wf

DISC 1 button

wg

TAPE A/B button and indicator

wh

DISC 2 button

wj

CD button and indicator

wk

DISC 3 button

wl

TUNER/BAND button and indicator

e;

Z OPEN/CLOSE button

1

CD DIGITAL OUTPUT (OPTICAL) connector

2

VOLTAGE SELECTOR switch (E model)

3

AM ANTENNA terminals

4

FM ANTENNA jack or terminals

5

MD IN jacks

6

SPEAKER terminals

1

5

6

8

7

2

qf

qh

ql

w;

wa

qk

qg

qj

9 0 qa qs qd

e;

wk

wj

wg

wl

wd

wf

ws

wh

4

3

4

1

2

5

3

6