HCD-MC3AV - Sony Audio Service Manual (repair manual)

2001J1600-1

© 2001.10

US Model

Canadian Model

Australian Model

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

a and “PRO

LOGIC” are trademarks of Dolby Laboratories
Licensing Corporation.

• HCD-MC3AV is the tuner, deck,

CD and amplifier section in MHC-MC3AV.

— Continued on next page —

Model Name Using Similar Mechanism HCD-F150/FR10

CD Mechanism Type

CDM-46B1

Optical Pick-up Name

KSS-213BA/F-NP

Model Name Using Similar Mechanism HCD-DR8AV

Tape Transport Mechanism Type

TCM-230AWR2/230PWR2

CD
Section

Tape deck

Section

AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
With 8 

Ω

 loads both channels driven, from 70 – 20,000 Hz; rated 80 W per

channel minimum RMS power, with no more than 0.9% total harmonic
distortion from 250 mW to read output.

North American model:
Front Speaker:
Continuous RMS power output

80 + 80 W
(8 

Ω

 at 1 kHz, 10% THD)

Total harmonic distortion

less than 0.09%
(8 

Ω

 at 1 kHz, 40 W)

Center Speaker:
Continuous RMS power output

20 W
(8 

Ω

 at 1 kHz. 1% THD)

Rear Speaker:
Continuous RMS power output

10 + 10 W
(16 

Ω

 at 1 kHz, 1% THD)

Australian model:
The following measured at AC 240 V, 60 Hz;

Front Speaker:
DIN power output (Rated)

70 + 70 W
(8 

Ω

 at 1 kHz, DIN)

Continuous RMS power output (Reference)

80 + 80 W
(8 

Ω

 at 1 kHz, 10% THD)

Center Speaker:
DIN power output (Rated)

17.5 W
(8 

Ω

 at 1 kHz, DIN)

Continuous RMS power output (Reference)

20 W
(8 

Ω

 at 1 kHz, 10% THD)

Rear Speaker:
DIN power output (Rated)

8 + 8 W
(8 

Ω

 at 1 kHz, DIN)

Continuous RMS power output (Reference)

10 + 10 W
(8 

Ω

 at 1 kHz, 10% THD)

— 2 —

The following measured at AC 220 V, 60 Hz;

DIN power output (Rated)

60 + 60 W
(8 

Ω

 at 1 kHz, DIN)

Continuous RMS power output (Reference)

70 + 70 W
(8 

Ω

 at 1 kHz, 10% THD)

DIN power output (Rated)

15 W
(8 

Ω

 at 1 kHz, DIN)

Continuous RMS power output (Reference)

17.5 watts
(8 

Ω

 at 1 kHz, 10% THD)

DIN power output (Rated)

7 + 7 W
(8 

Ω

 at 1 kHz, DIN)

Continuous RMS power output (Reference)

8.5 + 8.5 W
(8 

Ω

 at 1 kHz, 10% THD)

Inputs
VIDEO/MD IN (phono jack):

voltage 250 mV/450 mV,
impedance 47 k

Ω

Outputs
VIDEO/MD OUT (phono jack):

voltage 250 mV,
impedance 1 k

Ω

PHONES (stereo phone jacks): accepts headphones of 8 W or more

SPEAKER:

accepts impedance of 8 to 16 

Ω

REAR SPEAKER:

accepts impedance of 16 

Ω

CENTER SPEAKER:

accepts impedance of 8 

Ω

SUPER WOOFER:

voltage 1 V, impedance 1 k

Ω

System

Compact disc and digital audio system

Laser

Semiconductor laser (

λ

 =780 mm)

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

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

600 nm

Output level

–18 dBm

Recording system

4-track 2-channel stereo

Frequency response (DOLBY NR OFF)

40 – 13,000 Hz (± 3 dB),
using Sony TYPE I
cassette
40 – 14,000 Hz (± 3 dB),
using Sony TYPE II
cassette

FM stereo, FM/AM superheterodyne tuner

Tuning range

87.5 – 108.0 MHz

Antenna

FM lead antenna

Antenna terminals

75 W 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
North American model:

120 V AC, 60 Hz

Australian model:

220 - 240  V AC, 50/60 Hz

Power consumption
U.S.A models:

250 W

Canadian models:

250 VA

Australian models:

250 W

Dimensions (w/h/d)

Approx. 280 

×

 373 

×

 437 mm

(11

1

/

8

 

×

 14

3

/

4

 

×

 17

1

/

4

 in)

Mass

Approx. 12 kg (26 lbs. 7 oz)

Supplied accessories:

AM loop antenna (1)
Remote RM-SF250AV (1)
Batteries (2)
FM lead antenna (1)
Speaker cords (5)
Front speaker pads (8)
Center speaker pads (4)

Design and specifications are subject to change without notice.

Use only the supplied SS-SR50 rear surround speaker for connection to the REAR
SPEAKER connector, the supplied SS-CN50 center surround speaker for connection
to the CENTER SPEAKER connector on the MHC-MC3AV.

!

!

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

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

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

!

(US model only)

    After correcting the original service problem, perform the
following safety checks 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 microampers).
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” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)

Earth Ground

AC
voltmeter
(0.75V)

1.5k

Ω

0.15

µ

F

Fig. A.  Using an AC voltmeter to check AC leakage.

To Exposed Metal 
Parts on Set

— 3 —

— 4 —

 FRONT PANEL ···································································· 5
 REAR PANEL ······································································· 6

······························································· 8

··································································· 16

···························· 18

Deck Section ········································································ 21
CD Section ··········································································· 25

6-1.

Block Diagram   CD Section ············································ 27
Block Diagram   Main Section ········································· 29
Block Diagram   Audio Section ········································ 31

6-2.

Circuit Boards Location ··················································· 33

6-3.

Printed Wiring Board   BD Section ·································· 35

6-4.

Schematic Diagram    BD Section ···································· 37

6-5.

Printed Wiring Board   CD Motor Section ······················· 39

6-6.

Schematic Diagram   CD Motor Section ·························· 41

6-7.

Printed Wiring Board   Audio Section ······························ 43

6-8.

Schematic Diagram   Audio Section ································· 45

6-9.

Printed Wiring Board   Leaf SW Section ························· 47

6-10. Schematic Diagram   Leaf SW Section ···························· 49
6-11. Printed Wiring Board   Main Section ······························· 51
6-12. Schematic Diagram   Main (1/5) Section ························· 53
6-13. Schematic Diagram   Main (2/5) Section ························· 55
6-14. Schematic Diagram   Main (3/5) Section ························· 57
6-15. Schematic Diagram   Main (4/5) Section ························· 59
6-16. Schematic Diagram   Main (5/5) Section ························· 61
6-17. Printed Wiring Board   Panel Section ······························· 63
6-18. Schematic Diagram   Panel Section ································· 65
6-19. Printed Wiring Board   Surround Amp Section ················ 67
6-20. Schematic Diagram   Surround Amp Section ··················· 69
6-21. Schematic Diagram   Power Section ································ 71
6-22. Printed Wiring Board   Power Section ····························· 73
6-23. Waveforms ········································································ 75
6-24. IC Pin Function Description ············································· 76
6-25. IC Block Diagrams ··························································· 84

····················································· 86

····································· 94

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.

Carry out the “S curve check” in “CD section adjustment” and check
that the S curve waveform is output repeatedly.

•

Never reuse a disconnected chip component.

•

Notice that the minus side of a tantalum capacitor may be damaged
by heat.

•

Keep the temperature of the 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.