DOWNLOAD Sony HCD-VX77J / MHC-VX77 / MHC-VX77J Service Manual ↓ Size: 8.44 MB | Pages: 83 in PDF or view online for FREE

1

HCD-VX77/VX77J is the tuner, deck, CD and
amplifier section in MHC-VX77/VX77J.

Model Name Using Similar Mechanism

NEW

CD Mechanism Type

CDM58-K2BD37A

Base Unit Type

BU-K2BD37A

Optical Pick-up Type

KSM-213DAP

Model Name Using Similar Mechanism

NEW

Tape Transport Mechanism Type

TCM-230PWR11

CD

SECTION

TAPE DECK

SECTION

Photo: HCD-VX77

E Model

The following measured at AC 120, 220, 240V
50/60 Hz
DIN power output (rated) 160 + 160 watts

(6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference)

200 + 200 watts
(6 ohms at 1 kHz,
10% THD)

Inputs
MD/VIDEO (AUDIO) IN: voltage 450 mV/250 mV,
(phono jacks)

impedance 47 kilohms

MIC:

sensitivity 1 mV,

(phone jack)

impedance 10 kilohms

Outputs
VIDEO OUT:

max. output level 1 Vp-p,

(Phono jack)

unbalanced, Sync
negative, load impedance
75 ohms

S-VIDEO OUT:

Y: 1 Vp-p, unbalanced

(4 pin/mini-DIN jack)

Sync negative
C: 0.286 Vp-p
load impedence 75 ohms

PHONES:

accepts headphones of 8

(stereo mini jack)

ohms or more

FRONT SPEAKER:

accepts impedance of 6 to
16 ohms

SURROUND SPEAKER: accepts impedance of

16 ohms

System

Compact disc and digital
audio system

Laser

Semiconductor laser
(λ=780nm)
Emission duration:
continuous

Laser output

Max. 44.6 µW*
*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.

Frequency response

2 Hz – 20 kHz (±0.5 dB)

Wavelength

780 – 790 nm

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

87.5 – 108.0 MHz

Antenna

FM lead antenna

Antenna terminals

75 ohm unbalanced

Intermediate frequency

10.7 MHz

Tuning range
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

2003L02-1

© 2003.12

2

Power requirements
Thailand models:

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

250 watts

Dimensions (w/h/d)

Approx. 280 x 360 x 425
mm (11

 

x 14

3

/

16

 x 16

11

/

16

in.)

Mass:

Approx. 9.5 kg
(21 lb.)

Supplied accessories:

AM loop antenna (1)
Remote commander (1)
Batteries (2)
Video cable (1)
FM lead antenna (1)
Front speaker pads (8)

Design and specifications are subject to change
without notice.

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7-1.

Circuit Board Location ····················································· 23

7-2.

Block Diagrams – TUNER/CD Section – ························ 25

7-3.

Printed Wiring Board – BD Section – ······························ 28

7-4.

Schematic Diagram – BD Section – ································· 29

7-5.

Printed Wiring Board – Video Section – ·························· 30

7-6.

Schematic Diagram – Video (1/3) Section – ···················· 31

7-7.

Schematic Diagram – Video (2/3) Section – ···················· 32

7-8.

Schematic Diagram – Video (3/3) Section – ···················· 33

7-9.

Printed Wiring Board – Main Section – ··························· 34

7-10. Schematic Diagram – Main (1/3) Section – ····················· 35
7-11. Schematic Diagram – Main (2/3) Section – ····················· 36
7-12. Schematic Diagram – Main (3/3) Section – ····················· 37
7-13. Printed Wiring Board – Power AMP Section – ················ 38
7-14. Schematic Diagram – Power AMP Section – ··················· 39
7-15. Printed Wiring Board – Panel Section – ··························· 40
7-16. Schematic Diagram – Panel Section – ····························· 41
7-17. Printed Wiring Board – Leaf SW Section – ····················· 42
7-18. Schematic Diagram – Leaf SW Section – ························ 43
7-19. Printed Wiring Board – Driver Section – ························· 44
7-20. Schematic Diagram – Driver Section – ···························· 45
7-21. Printed Wiring Board – Trans Section – ··························· 46
7-22. Schematic Diagram – Trans Section – ····························· 47
7-23. IC Pin Function ································································ 48
7-24. IC Block Diagrams ··························································· 57

8-1.

Main Section ····································································· 61

8-2.

Panel Section ···································································· 62

8-3.

Main Board Section ·························································· 63

8-4.

Tape Mechanism Deck Section-1 ····································· 64

8-5.

Tape Mechanism Deck Section-2 ····································· 65

8-6.

CD Mechanism Deck Section (CDM58-K2BD37A) ······· 66

8-7.

Base Unit Section (BU-K2BD37A) ································· 67

······································· 68

3

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

Laser component in this product is capable
of emitting radiation exceeding the limit for
Class 1.

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.

— BACK PANEL —

• Abbreviation

TH

: Thai model

TH

EXCEPT TH

4-225-040-6s

4-227-061-1s

4

× 

1

2

This model has the self-diagnosis function for the VIDEO and AUDIO decoder sections.
Connecting to the LED between TP522 and TP523 on the VIDEO BOARD.
Immediately after the power on, the self-diagnosis function searches each operation of IC’s around the mechanism control microcomputer
(IC701). and TP5
The results can be checked by LED of the VIDEO board.

Oscilloscope (Waveform)

Symptom

No error

MPEG decoder (IC505)
error

MPEG decoder (IC505)
or
DRAM (IC507) error