HCD-VX222, MHC-VX222 - Sony Audio Service Manual (repair manual)

E Model

— Continued on next page —

• HCD-VX222 is the tuner, deck, CD

and amplifier section in MHC-
VX222.

2003L02-1

© 2003.12

Model Name Using Similar Mechanism

NEW

CD

CD Mechanism Type

CDM58B-K6BD37A

Section

Base Unit Name

BU-K6BD37A

Optical Pick-up Name

KSM-213DAP

Tape deck

Model Name Using Similar Mechanism

HCD-DX20/RG30

Section

The following measured at AC 120, 220, 240 V
50/60 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/VIDEO (AUDIO) IN (phono jacks):

voltage 450/250 mV,
impedance 47 kilohms

GAME (AUDIO) IN (phono jack):

voltage 450 mV,
impedance 47 kilohms

MIC 1/2 (mini jack):

sensitivity 1 mV,
impedance 10 kilohms

Outputs
MD/VIDEO (AUDIO) OUT (phono jacks):

voltage 250 mV
impedance 1 kilohms

VIDEO OUT (phono jack):

max. output level
1Vp-p, unbalanced, Sync
negative, load impedance
75 ohms

S-VIDEO OUT (4-pin/mini-DIN jack):

Y: 1Vp-p, unbalanced,
Sync negative,
C: 0.286Vp-p,
load impedance 75 ohms

PHONES (stereo mini jack):

accepts headphones of
8 ohms or more

SPEAKER:

accepts impedance of 6 to
16 ohms

2

CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.

Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

Flexible Circuit Board Repairing
• 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.

The laser diode in the optical pick-up block may suffer electrostatic
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 emission,
observe from more than 30 cm away from the objective lens.

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.

Power requirements
Thai model:

220 V AC, 50/60 Hz

Other models:

120 V, 220 V or
230 – 240 V AC,
50/60 Hz
Adjustable with voltage
selector

Power consumption

120 watts

Dimensions (w/h/d)

Approx. 280 x   325  x  421 mm

Mass

Approx. 9.0 kg

Design and specifications are subject to change
without notice.

System

Compact disc and digital
audio and video system

Laser

Semiconductor laser
( =780 nm)
Emission duration:
continuous

Wavelength

780 – 790 nm

Frequency response

2 Hz – 20 kHz (

±0.5 dB)

Signal-to-noise ratio

More than 90 dB

Dynamic range

More than 90 dB

Video color system format

NTSC, PAL

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
Tourist model:

76.0 – 108.0 MHz

Other models:

87.5 – 108.0 MHz

Antenna

FM lead antenna

Antenna terminals

75 ohm unbalanced

Intermediate frequency

10.7 MHz

Tuning range
Middle Eastern and Philippine 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

3

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6-1.Circuit Board Location .................................................. 21
6-2.Block Diagrams  –Tuner Section– ................................. 22

   Block Diagrams  –Main Section– ................................. 23

       Block Diagrams  –Video Section– ................................ 24
6-3.Printed Wiring Board  –Driver Section– ........................ 25
6-4.Schematic Diagram  –Driver Section– .......................... 25
6-5.Printed Wiring Board  –BD Section– ............................ 26
6-6.Schematic Diagram  –BD Section – .............................. 27
6-7.Printed Wiring Board  –Main Section– .......................... 28
6-8.Schematic Diagram  –Main Section (1/5) – ................... 29
6-9.Schematic Diagram  –Main Section (2/5) – ................... 30
6-10. Schematic Diagram  –Main Section (3/5) – ................ 31
6-11. Schematic Diagram  –Main Section (4/5) – ................ 32
6-12. Schematic Diagram  –Main Section (5/5) – ................ 33
6-13. Printed Wiring Board  –Power AMP Section– ........... 34
6-14. Schematic Diagram  –Power AMP Section– .............. 35
6-15. Printed Wiring Board  –Panel Section– ...................... 36
6-16. Schematic Diagram  –Panel Section– ......................... 37
6-17. Printed Wiring Board  –Trans Section– ...................... 38
6-18. Schematic Diagram  –Trans Section– ......................... 39
6-19. Printed Wiring Board  –Video CD Section– ............... 40
6-20. Schematic Diagram  –Video CD Section (1/2) – ........ 41
6-21. Schematic Diagram  –Video CD Section (2/2) – ........ 42
6-22. IC Pin Function Description ....................................... 43
6-23. IC Block Diagrams ..................................................... 48

7-1.Main Section .................................................................. 52
7-2.Front Panel Section ........................................................ 53
7-3.Chassis Section .............................................................. 54
7-4.CD Mechanism Deck Section ........................................ 55

...................................... 56

4

1

Connector 

      13p (CN712)

2

Cut the seven melted-connection points

     with a cutting plier.

4

Cut the six melted-connection points

     with a cutting plier.

3

Panel board

5

Key board

Panel board
(ten screw holes)

Key board
(eight screw holes)

Screw hole

In order to re-install the panel board and the key board,
fix them by using the screws (+BVTP 2.6

 

× 

8 ) respectively.

Screw in to the respective screw holes.
Do not tighten the screws excessively.

* The panel board and the key board only are connected to the front panel
  by means of hot-melting the plastics.

Hot melt