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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

SURROUND SPEAKER SUB WOOFER:

accepts impedance of
8 ohms

System

Compact disc and digital
audio system

Laser

Semiconductor laser
(

λ

= 780 nm)

Emission duration:
continuous

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

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

Wow and flutter

±

0.15% W.Peak (IEC)

0.1% W.RMS (NAB)

±

0.2% W.Peak (DIN)

POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:

with 8 ohm loads both channels driven, from
120 – 10,000 Hz; rated 75 watts per channel
minimum RMS power, with no more than 10%
total harmonic distortion from 250 milliwatts to
rated output.

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

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

Continuous RMS power output

45 + 45 watts
(8 ohms at 1 kHz,
10% THD)

Continuous RMS power output

45 watts
(8 ohms at 100 Hz,
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

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unpublished works.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.

US Model

2001K0500-1

C

 2001.11

HCD-MG510AV are the Amplifier, CD player, Tape
Deck and Tuner section in MHC-MG510AV.

– Continued on next page –

Model Name Using Similar Mechanism

HCD-MG310AV

CD

CD Mechanism Type

CDM64-K1BD44A

Section

Base Unit Name

BU-K1BD44A

Optical Pick-up Name

KSM-213BFN

TAPE

Model Name Using Similar Mechanism

HCD-MG310AV

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. MAIN Board ...................................................................

9

3-5. Back Panel, DC FAN (M391) .........................................

9

3-6. MAIN AMP Board, POWER Board ............................... 10
3-7. Middle (F) Assy, Bracket (Middle-R),

Power Bracket ................................................................. 10

3-8. CD Mechanism Deck (CDM64-K1BD44A) .................. 11
3-9. Base Unit (BU-K1BD44A) ............................................. 11
3-10. BU Holder Assy .............................................................. 12
3-11. Motor Gear Assy (Sled) (M102), CD Board .................. 12
3-12. Op Base Assy (KSM-213BFN) ...................................... 13
3-13. Cassette Lid Assy (A)/(B) ............................................... 13
3-14. Mech Deck (Tape) ........................................................... 14

.............................................................. 15

....................... 16

Deck Section ................................................................... 16
CD Section ...................................................................... 18
Sensor Section ................................................................. 20

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

– DISPLAY/POWER SUPPLY Section – ...................... 25

7-6. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 26

7-7. Schematic Diagram – CD Section – ............................... 28
7-8. Printed Wiring Board – CD Section – ............................ 29
7-9. Printed Wiring Boards

– CD MOTOR/SENSOR Section – ................................ 30

7-10. Schematic Diagram

– CD MOTOR/SENSOR Section – ................................ 31

7-11. Printed Wiring Board – TC Section – ............................. 32
7-12. Schematic Diagram – TC Section – ............................... 33
7-13. Schematic Diagram – MAIN Section (1/4) – ................. 34
7-14. Schematic Diagram – MAIN Section (2/4) – ................. 35
7-15. Schematic Diagram – MAIN Section (3/4) – ................. 36
7-16. Schematic Diagram – MAIN Section (4/4) – ................. 37
7-17. Printed Wiring Board – MAIN Section – ....................... 38
7-18. Printed Wiring Boards – MAIN AMP Section – ............ 40
7-19. Schematic Diagram – MAIN AMP Section – ................ 41
7-20. Printed Wiring Board – SUB AMP Section – ................ 42
7-21. Schematic Diagram – SUB AMP Section – ................... 42
7-22. Printed Wiring Boards – DISPLAY Section – ............... 44
7-23. Schematic Diagram – DISPLAY Section – .................... 45
7-24. Printed Wiring Board – CONTROL Section – ............... 46
7-25. Schematic Diagram – CONTROL Section – .................. 47
7-26. Printed Wiring Boards – POWER Section – .................. 48
7-27. Schematic Diagram – POWER Section – ...................... 49
7-28. IC Pin Function Description ........................................... 50

8-1. General Section ............................................................... 56
8-2. Front Panel Section ......................................................... 57
8-3. Chassis Section ............................................................... 58
8-4. CD Mechanism Deck Section (CDM64-K1BD44A) ..... 59
8-5. Base Unit Section (BU-K1BD44A) ............................... 60

............................... 61

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

Antenna

AM loop antenna

Antenna terminals

External antenna terminal

Intermediate frequency

450 kHz

Power requirements

120 V AC, 60 Hz

Power consumption

220 watts

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

Approx. 280 

×

 383 

×

 480

mm

Mass

Approx. 11.5 kg

Design and specifications are subject to change
without notice.

3

Ω

µ

After correcting the original service problem, perform the follow-
ing 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.

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 not exceed 0.5 mA (500 microamperes.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’ instructions to use these
instruments.

2. A battery-operated 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 battery-operated AC voltmeter. The “limit” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples 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)

CAUTION

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

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.

• 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.