HCD-GX45, HCD-RG440, MHC-GX45, MHC-RG440S - Sony Audio Service Manual (repair manual)

1

Model Name Using Similar Mechanism

NEW

CD

CD Mechanism Type

CDM74F-K6BD71A

Section

Base Unit Name

BU-K6BD71A

Optical Pick-up Name

KSS-213DCP

Tape Deck

Model Name Using Similar Machanism

CX-JT8

Section

Tape Transport Mechanism Type

CWM43FF-13

US Model

Canadian Model

HCD-GX45

AEP Model

UK Model

Australian Model

HCD-RG440

With 6 ohm loads, both channels driven, from
120 – 10,000 Hz; rated 120 watts per channel
minimum RMS power, with no more than 10 %
total harmonic distortion from 250 milliwatts to
rated output.

Front speaker
Continuous RMS power output (reference):

120 + 120 watts (6 ohms at
1 kHz, 10% THD)

Total harmonic distortion less than 0.07% (6 ohms at

1 kHz, 60 W)

Sub woofer
Continuous RMS power output (reference):

120 watts (6 ohms at
60 Hz, 10% THD)

Total harmonic distortion less than 0.07% (6 ohms at

60 Hz, 60 W)

Front speaker
DIN power output (rated): 80 + 80 watts

(6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference):

100 + 100 watts (6 ohms at
1 kHz, 10% THD)

Music power output (reference):

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

Sub woofer
DIN power output (rated): 80 watts (6 ohms at

60 Hz, DIN)

Continuous RMS power output (reference):

100 watts (6 ohms at
60 Hz, 10% THD)

Music power output (reference):

200 watts (6 ohms at
60 Hz, 10% THD)

The following measured at AC 120, 220, 240 V,
50/60 Hz
DIN power output (rated): 80 + 80 watts

(6 ohms at 1 kHz, DIN)

Continuous RMS power output (reference):

100 + 100 watts (6 ohms at
1 kHz, 10% THD)

Inputs
GAME INPUT AUDIO L/R (phono jacks):

voltage 250 mV,
impedance 47 kilohms

GAME INPUT VIDEO (phono jack):

1 Vp-p, 75 ohms

Outputs
PHONES (stereo mini jack):

accepts headphones of
8 ohms or more

2005D04-1

© 2005. 04

– Continued on next page –

• HCD-GX45/RG440 is the

tuner, deck, CD and amplifier
section in MHC-GX45/RG440S.

(Photo: HCD-GX45)

2

VIDEO OUT (phono jack): max. output level

1 Vp-p, unbalanced, Sync
negative, load impedance
75 ohms

SPEAKER:

accepts impedance of 6 to
16 ohms

SUB WOOFER OUT:

accepts impedance of 6 to
16 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

Recording system

4-track 2-channel, stereo

Frequency response

50 – 13,000 Hz (±3 dB),
using Sony TYPE I
cassettes

FM stereo, FM/AM superheterodyne tuner

Tuning range
Russian models

65.0 – 74.0 MHz
(There is no stereo effect)
87.5 – 108.0 MHz

Other models

87.5 – 108.0 MHz

Antenna

FM lead antenna

Antenna terminals

75 ohms unbalanced

Intermediate frequency

10.7 MHz

Tuning range
Pan-American models:

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

European, Russian, Middle Eastern and Philippine models:

531 – 1,602 kHz (with the tuning
interval set at 9 kHz)

Other models:

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

Antenna

AM loop antenna

Antenna terminals

External antenna terminal

Intermediate frequency

450 kHz

Speaker system

3-way, 3-unit, bass-reflex
type

Speaker units
Sub Woofer:

13 cm, cone type

Woofer:

13 cm, cone type

Tweeter:

5 cm, cone type

Nominal impedance

6 ohms

Dimensions (w/h/d)

Approx. 240 

× 325 × 243 mm

Mass

Approx. 4.3 kg net per
speaker

Speaker system

Bass-reflex type

Speaker units
Woofer:

20 cm, cone type

Nominal impedance

6 ohms

Dimensions (w/h/d)

Approx. 265 

× 325 × 350 mm

Mass

Approx. 6.4 kg

Speaker system

3-way, 3-unit, bass-reflex
type

Speaker units
Woofer:

13 cm, cone type

Sub Woofer:

13 cm, cone type

Tweeter:

5 cm, cone type

Nominal impedance

6 ohms

Dimensions (w/h/d)

Approx. 240 

× 325 × 243 mm

Mass

Approx. 4.3 kg net per
speaker

Speaker system

Bass-reflex type

Speaker units
Woofer:

20 cm, cone type

Nominal impedance

6 ohms

Dimensions (w/h/d)

Approx. 265 

× 325 × 350 mm

Mass

Approx. 6.4 kg

Power requirements
North American models:

120 V AC, 60 Hz

European and Russian models:

230 V AC, 50/60 Hz

Australian model:

230 – 240 V AC, 50/60 Hz

Argentine model:

220 V AC, 50/60 Hz

Mexican model:

127 V AC, 60 Hz

Saudi Arabian model:

120 – 127 V/220 V or
230 – 240 V AC,
50/60 Hz
Adjustable with voltage
selector

Korean model:

220 V AC, 60 Hz

Other models:

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

Power consumption
USA model:
HCD-GX45:

180 watts

European and Russian models:
HCD-RG440:

150 watts
0.35 watts (at the Power
Saving Mode)

Other models:
HCD-RG440:

150 watts

Dimensions (w/h/d)

Approx. 280 

× 325 × 407 mm

Mass
North American models:
HCD-GX45:

Approx. 9.0 kg

European and Russian models:
HCD-RG440:

Approx. 9.0 kg

Supplied accessories:

AM loop antenna (1)
Remote Commander (1)
Batteries (2)
FM lead antenna (1)
Speaker pads (12)

0

0

0

3

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

The laser diode in the optical pick-up block may suffer electrostatic
breakdown 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.

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

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

damaged by heat.

• 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.

This set has a disc tray lock function to prevent discs for
demonstration at shops from theft. While this lock function is set,
the tray will not be delivered out even when the OPEN/CLOSE
button is pressed.

Press the OPEN/CLOSE button while pressing the STOP button.
After a few seconds, the message “LOCKED” will appear on the
fluorescent indicator tube with the tray locked.

Just as the lock is set, press the OPEN/CLOSE button while
pressing the STOP button.
After a few seconds, the message “UNLOCKED” will appear with
the lock released.

To Exposed Metal
Parts on Set

0.15µF

1.5k

Ω

AC
voltmeter
(0.75V)

Earth Ground

After correcting the original service problem, perform the following
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” 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)

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

4

Main Unit ................................................................................ 5
Remote Control ....................................................................... 5

2-1.   Case (Top) ........................................................................... 7
2-2.   CD Door .............................................................................. 7
2-3.   CD Mechanism Block ......................................................... 8
2-4.   Front Panel Section ............................................................. 9
2-5.   Tape Mechanism Deck ...................................................... 10
2-6.   Panel Board, 6 Stream Led Board, Remote Board ............ 10
2-7.   Game Jack Board, H/P Jack Board ................................... 11
2-8.   Back Panel Section ............................................................ 11
2-9.   Main Board ....................................................................... 12
2-10. Power Amp Board, Subwoofer Board ............................... 12
2-11. SW Board, Driver Board ................................................... 13
2-12. CD Block Assy .................................................................. 13
2-13. Sensor Board ..................................................................... 14
2-14. Motor (TB) Board ............................................................. 14
2-15. Motor (LD) Board ............................................................. 15
2-16. BD Board .......................................................................... 15
2-17. Optical Pick-up ................................................................. 16

..................................................................... 17

................................. 20

5-1.   IC Pin Descriptions ........................................................... 21
5-2.   Block Diagram –CD Section– ........................................... 25
5-3.   Block Diagram –Tuner/Tape/Panel Section– .................... 26
5-4.   Block Diagram –Amp/Power Supply Section– ................. 27
5-5.   Block Diagram –Sub Woofer Section– ............................. 28
5-6.   Note for Printed Wiring Boards

     and Schematic Diagrams .................................................. 29

5-7.   Waveforms ......................................................................... 29

5-8.   Circuit Boards Location .................................................... 29
5-9.   Printed Wiring Board –CD Mechanism Section (1/2)– .... 30
5-10. Schematic Diagram –CD Mechanism Section (1/2)– ....... 31
5-11. Printed Wiring Boards –CD Mechanism Section (2/2)– ... 32
5-12. Schematic Diagram –CD Mechanism Section (2/2)– ....... 33
5-13. Schematic Diagram –Main Section (1/4)– ........................ 34
5-14. Schematic Diagram –Main Section (2/4)– ........................ 35
5-15. Schematic Diagram –Main Section (3/4)– ........................ 36
5-16. Schematic Diagram –Main Section (4/4)– ........................ 37
5-17. Printed Wiring Board –Main Section– .............................. 38
5-18. Printed Wiring Boards and Schematic Diagram

    –Jack Section– ................................................................... 39

5-19. Printed Wiring Boards –Panel Section– ............................ 40
5-20. Schematic Diagram –Panel Section– ................................ 41
5-21. Printed Wiring Board –Sub Woofer Section– ................... 42
5-22. Schematic Diagram –Sub Woofer Section– ...................... 43
5-23. Schematic Diagram –Power Amp Section (1/2)– ............. 44
5-24. Schematic Diagram –Power Amp Section (2/2)– ............. 45
5-25. Printed Wiring Board –Power Amp Section– ................... 46
5-26. Printed Wiring Board

    –Transformer Section– ...................................................... 47

5-27. Schematic Diagram –Transformer Section– ..................... 48
5-28. IC Block Diagrams ............................................................ 49

6-1.   Main Section ..................................................................... 52
6-2.   Front Panel Section (1) ...................................................... 53
6-3.   Front Panel Section (2) ...................................................... 54
6-4.   Front Panel Section (3) ...................................................... 55
6-5.   Main Board Section .......................................................... 56
6-6.   CD Mechanism Deck Section (1) ..................................... 57
6-7.   CD Mechanism Deck Section (2) ..................................... 58
6-8.   Base Unit Section .............................................................. 59

........................................ 60

– BACK PANEL –

GX45: US, CND

4-244-697-31

RG440: AEP, UK, AUS

4-244-697-41

• Abbreviation

CND : Canadian model
AUS : Australian model

PARTS No.