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Continuous RMS power output

75 + 75 watts
(8 ohms at 1 kHz,
10% THD)

Total harmonic distortion less than 0.09%

(8 ohms at 1 kHz,
40 watts)

Continuous RMS power output

25 watts
(8 ohms at 1 kHz,
10% THD)

Continuous RMS power output

25 + 25 watts
(8 ohms at 1 kHz,
10% THD)

Inputs
VIDEO/MD IN (phono jacks):

voltage 250 mV/450 mV,
impedance 47 kilohms

5.1CH:
FRONT (phono jacks)

voltage 450 mV,
impedance 47 kilohms

REAR (phono jacks)

voltage 450 mV,
impedance 47 kilohms

CENTER (phono jack)

voltage 450 mV,
impedance 47 kilohms

SUB WOOFER (phono jack):

voltage 450 mV,
impedance 47 kilohms

Outputs
PHONES (stereo phone jack):

accepts headphones of
8 ohms or more

FRONT SPEAKER:

accepts impedance of 8 to
16 ohms

SURROUND SPEAKER REAR:

accepts impedance of 8 to
16 ohms

SURROUND SPEAKER CENTER:

accepts impedance of
8 ohms

SUB WOOFER:

voltage 1 V,
impedance 1 kilohm

VIDEO OUT (phono jack):

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

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

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

System

Compact disc and digital
audio system

Laser

Semiconductor laser
(

λ

= 795 nm)

Emission duration:
continuous

Frequency response

2 Hz – 20 kHz (

±

0.5 dB)

Wavelength

775 – 815 nm

Signal-to-noise ratio

More than 90 dB

Dynamic range

More than 90 dB

Video color system format NTSC, PAL
OPTICAL OUT (CD)
(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

This stereo system is equipped with the Dolby* Pro
Logic Surround decoder.
* Manufactured under license from Dolby

Laboratories.  Dolby ,  Pro Logic , and the
double-D symbol 

; are trademarks of Dolby

Laboratories. Confidential unpublished works.
'1992-1997 Dolby Laboratories. All rights
reserved.

E Model

2002L0500-1

C

 2002.12

HCD-VM330AV is the Amplifier, Video CD/CD player,
Tape Deck and Tuner section in MHC-VM330AV.

– Continued on next page –

Model Name Using Similar Mechanism

NEW

CD

CD Mechanism Type

CDM64-30ABD61A

Section

Base Unit Name

BU-30ABD61A

Optical Pick-up Name

OP Assy (A-MAX. 3)

TAPE

Model Name Using Similar Mechanism

HCD-MG110

Section

Tape Transport Mechanism Type

CM8L6Z511A

2

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

4

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

5

3-1. Disassembly Flow ...........................................................

7

3-2. Upper Cover ....................................................................

8

3-3. Front Block Assy .............................................................

8

3-4. VIDEO Board ..................................................................

9

3-5. MAIN Board ...................................................................

9

3-6. Back Panel, DC Fan (M391) ........................................... 10
3-7. MAIN AMP Board, POWER Board,

VOL SEL Board .............................................................. 10

3-8. Middle (F) Assy, Bracket (Middle-R),

Power Bracket ................................................................. 11

3-9. CD Mechanism Deck (CDM64-30ABD61A) ................ 11
3-10. Base Unit (BU-30ABD61A) ........................................... 12
3-11. BU Holder Assy .............................................................. 12
3-12. Cassette Lid Assy (A)/(B) ............................................... 13
3-13. Mech Deck (TAPE) ......................................................... 13

.............................................................. 14

....................... 15

Deck Section ............................................................................. 15
CD Section ................................................................................ 17
Video Section ............................................................................ 18
Sensor Section ........................................................................... 19

7-1. Block Diagram – CD SERVO Section – ........................ 21
7-2. Block Diagram – AUDIO/VIDEO Section  – ................ 22
7-3. Block Diagram – TUNER/TAPE DECK Section  – ...... 23
7-4. Block Diagram – SURROUND Section – ...................... 24
7-5. Block Diagram – AMP Section – ................................... 25
7-6. Block Diagram

– DISPLAY/POWER SUPPLY Section – ...................... 26

7-7. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 27

7-8. Printed Wiring Board – BD Section – ............................ 28
7-9. Schematic Diagram – BD Section – ............................... 29
7-10. Printed Wiring Board – AUDIO/VIDEO Section – ....... 30
7-11. Schematic Diagram

– AUDIO/VIDEO Section (1/3) – .................................. 31

7-12. Schematic Diagram

– AUDIO/VIDEO Section (2/3) – .................................. 32

7-13. Schematic Diagram

– AUDIO/VIDEO Section (3/3) – .................................. 33

7-14. Printed Wiring Boards

– CD MOTOR/SENSOR Section – ................................ 34

7-15. Schematic Diagram

– CD MOTOR/SENSOR Section – ................................ 35

7-16. Printed Wiring Board – TC Section – ............................. 36
7-17. Schematic Diagram – TC Section – ............................... 37
7-18. Schematic Diagram – MAIN Section (1/4) – ................. 38
7-19. Schematic Diagram – MAIN Section (2/4) – ................. 39
7-20. Schematic Diagram – MAIN Section (3/4) – ................. 40
7-21. Schematic Diagram – MAIN Section (4/4) – ................. 41
7-22. Printed Wiring Board – MAIN Section – ....................... 42
7-23. Printed Wiring Boards – AMP Section – ........................ 44
7-24. Schematic Diagram – AMP Section – ............................ 45
7-25. Printed Wiring Boards – DISPLAY Section – ............... 46
7-26. Schematic Diagram – DISPLAY Section – .................... 47
7-27. Printed Wiring Board – CONTROL Section – ............... 48
7-28. Schematic Diagram – CONTROL Section – .................. 49
7-29. Printed Wiring Boards – POWER Section – .................. 50
7-30. Schematic Diagram – POWER Section – ...................... 51
7-31. IC Pin Function Description ........................................... 55

8-1. General Section ............................................................... 67
8-2. Front Panel Section ......................................................... 68
8-3. Chassis Section ............................................................... 69
8-4. Mechanism Deck Section (CDM64-30ABD61A) ......... 70
8-5. Base Unit Section (BU-30ABD61A) ............................. 71

............................... 72

FM stereo, FM/AM superheterodyne tuner

Tuning range

87.5 – 108.0 MHz

Antenna

FM lead antenna

Antenna terminals

75 ohms unbalanced

Intermediate frequency

10.7 MHz

Tuning range

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

Antenna

AM loop antenna

Antenna terminals

External antenna terminal

Intermediate frequency

450 kHz

Power requirements

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

Power consumption

200 watts

Dimensions (w/h/d) incl. projecting parts and controls

Approx. 280 

×

 383 

×

 480

mm

Mass:

Approx. 12.1 kg

Design and specifications are subject to change
without notice.

3

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.

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

0

0

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.

Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveforms is output three times.

• 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.

4

This unit is able to display the test data (character information)
written in the CD on its fluorescent indicator tube.
The CD-TEXT TEST DISC (TGCS-313:4-989-366-01) is used
for checking the display.
To check, perform the following procedure.

1. Press the

I/1

button to turn the power on, set the disc to the

disc table with the “test disc” label facing up, and chuck the
disc.

2. Press the 

[CD]

 button to set CD function, and press the

n N

button

to playback the disc.

3. The following will be displayed on the liquid crystal display.

Display : 1KHZ/0DB/L R

4. Pressing the 

[--       ]

 or 

[       +]

 button, select the track. The text

data of each track will be displayed.
For details of the displayed contents for each track, refer to “Table
1: CD-TEXT TEST DISC TEXT Data Contents”.

In this unit, some special characters will not be displayed prop-
erly. These will be displayed as a space or a character resembling
it.

1

1kHz/0dB/L&R

2

20Hz/0dB/L&R

3

40Hz/0dB/L&R

4

100Hz/0dB/L&R

5

200Hz/0dB/L&R

6

500Hz/0dB/L&R

7

1kHz/0dB/L&R

8

5kHz/0dB/L&R

9

7kHz/0dB/L&R

10

10kHz/0dB/L&R

11

16kHz/0dB/L&R

12

18kHz/0dB/L&R

13

20kHz/0dB/L&R

14

1kHz/0dB/L&R

15

1kHz/–1dB/L&R

16

1kHz/–3dB/L&R

17

1kHz/–6dB/L&R

18

1kHz/–10dB/L&R

19

1kHz/–20dB/L&R

20

1kHz/–60dB/L&R

TRACK

No.

Displayed Contents

 Track No. 21 to 99 are not displayed.

.

>

• In cleaning the objective lens of optical pick-up, be sure the

following below.

In cleaning the lens, do not apply an excessive force.
As the optical pick-up is vulnerable, application of excessive
force could damage the lens holder.

In cleaning, do not use a cleaner other than exclusive cleaning
liquid (KK-91 or isopropyl alcohol).

Wipe the objective lens spirally from center toward outside. (See
Figure A)

2

Remove the 
magnet assy.

1

Open the torsion holder 
(magnet) in direction of 
arrow 

A

.

A

optical pick-up

bracket (top 60) hole

3

Put a cotton bud into 
the hole on the bracket 
(top 60) and clean the 
OP lens.