DOWNLOAD Sony HCD-GX355 / HCD-GX555 / HCD-RG270 / HCD-RG475 / HCD-RG575 / MHC-GX355 / MHC-GX555 / MHC-RG270 / MHC-RG475S / MHC-RG575S Service Manual ↓ Size: 9.94 MB | Pages: 124 in PDF or view online for FREE

US Model

Canadian Model

HCD-GX355/GX555

AEP Model

UK Model

Australian Model

HCD-RG270/RG475

E Model

HCD-RG270/RG475/RG575

2005J05-1
© 2005.10

Photo: HCD-RG575

•

HCD-GX355 is the amplifier, CD player, tape
deck and tuner section in MHC-GX355.

•

HCD-GX555 is the amplifier, CD player, tape
deck and tuner section in MHC-GX555.

•

HCD-RG270 is the amplifier, CD player, tape
deck and tuner section in MHC-RG270.

•

HCD-RG475 is the amplifier, CD player, tape
deck and tuner section in MHC-RG475S.

•

HCD-RG575 is the amplifier, CD player, tape
deck and tuner section in MHC-RG575S.

With 6 ohm loads, both channels driven, from 
120 – 10,000 Hz: rated 145 watts per channel 
minimum RMS power, with no more than 10% 
total harmonic distortion from 250 milliwatts to 
rated output.

With 6 ohm loads, both channels driven, from 
120 – 10,000 Hz: rated 150 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):

145 + 145 watts (6 ohms at 
1 kHz, 10% THD)

Tot al harmonic distortion less than 0.07% (6 ohms at 

1 kHz,  80  W)

Sub woofer
Continuous RMS power output (reference):

170 watts (6 ohms at 
80 Hz, 10% THD)

Tot al harmonic distortion less than 0.07% (6 ohms at 

80 Hz, 90 W)

Continuous RMS power output (reference):

150 + 150 watts (6 ohms at 
1 kHz, 10% THD)

Tot al harmonic distortion less than 0.07% (6 ohms at 

1 kHz,  80  W)

Front speaker
DIN power output (rated): 110 + 110 watts (6 ohms at 

1 kHz, DIN)

Continuous RMS power output (reference):

140 + 140 watts (6 ohms at 
1 kHz, 10% THD)

Music power output (reference):

280 + 280 watts (6 ohms at 
1 kHz, 10% THD)

Sub woofer
DIN power output (rated): 130 watts (6 ohms at 

80 Hz, DIN)

Continuous RMS power output (reference):

160 watts (6 ohms at 
80 Hz, 10% THD)

Music power output (reference):

320 watts (6 ohms at 
80 Hz, 10% THD)

– Continued on next page –

Model Name Using Similar Mechanism

NEW

CDM74KFS-F1BD81C (Except Mexican model) or

CD Mechanism Type

CDM74KF-K6BD83S (US, Canadian, AEP, UK, East European,

CD

Russian, E2, E51 models)/CDM74KFS-F1BD84 (Mexican model)

Section

BU-F1BD81C (Except Mexican model) or

Base Unit Name

BU-K6BD83S-WOD (US, Canadian, AEP, UK, East European,

Russian, E2, E51 models)/BU-F1BD84 (Mexican model)

Optical Pick-up Block Name

KSM-215DCP or KSM-213DCP

TAPE

Model Name Using Similar Mechanism

NEW

Section

Tape Transport Mechanism Type

CWM43FF13

•

Abbreviation
E2 : 120V AC Area in E model
E51 : Chilean and Peruvian models

2

The following measured at AC 120, 127, 220, 240 V 
50/60 Hz
Front speaker
DIN power output (rated): 100 + 100 watts (6 ohms at 

1 kHz, DIN)

Continuous RMS power output (reference):

125 + 125 watts (6 ohms at 
1 kHz, 10% THD)

Sub woofer
DIN power output (rated): 120 watts (6 ohms at 

80 Hz, DIN)

Continuous RMS power output (reference):

150 watts (6 ohms at 
80 Hz, 10% THD)

Front speaker
The following measured at AC 120, 127, 220, 240 V 
50/60 Hz
DIN power output (rated): 100 + 100 watts (6 ohms at 

1 kHz, DIN)

Continuous RMS power output (reference):

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

Sub woofer
DIN power output (rated): 120 watts (6 ohms at 

80 Hz, DIN)

Continuous RMS power output (reference):

150 watts (6 ohms at 
80 Hz, 10% THD)

The following measured at AC 120, 127, 220, 240 V 
50/60 Hz
DIN power output (rated): 100 + 100 watts (6 ohms at 

1 kHz, DIN)

Continuous RMS power output (reference):

125 + 125 watts (6 ohms at 
1 kHz, 10% THD)

Inputs
AUDIO IN (stereo mini jack):

voltage 250 mV, 
impedance 47 kilohms

MIC (phone jack) (Latin American model only):

sensitivity 1 mV, 
impedance 10 kilohms

Outputs
PHONES (stereo mini jack):

accepts headphones of 
8 ohms  or  more

VIDEO OUT (phono jack) (Mexican model only):

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

SPEAKER:

accepts impedance of 6 to 
16 ohms

SUBWOOFER OUT (HCD-GX555/RG575/
RG475 only):

accepts impedance of 6 to 
16 ohms

System

Compact disc and digital 
audio system

Laser Diode Properties

Emission duration: 
continuous
Laser Output*: 
Less than 44.6

µ

W

* This  output is the value measurement at a distance of 

200mm from the objective lens surface on the 
Optical Pick-up Block with 7mm aperture.

Frequency response

2 Hz – 20 kHz (

±

0.5 dB)

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

FM tuner section

Tuning range
North American model:

87.5 – 108.0 MHz 
(100 kHz step)

Other models:

87.5 – 108.0 MHz
(50 kHz step)

Antenna

FM lead antenna

Antenna terminals

75 ohms unbalanced

Intermediate frequency

10.7 MHz

AM tuner section

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 and Saudi Arabian 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

Intermediate frequency

450 kHz 

 

Power requirements
North American model:

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

Other models:

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

Power consumption
USA model:
HCD -GX555:

285 watts

HCD -GX355:

210 watts

Canadian model:
HCD -GX555:

380 VA

HCD -GX355:

290 VA

European and Russian models:
HCD-RG475:

300 watts
0.25 watts (at the Power 
Saving Mode)

HCD -RG270:

190 watts
0.25 watts (at the Power 
Saving Mode)

Other models:
HCD-RG575:

300 watts

HCD-RG475:

300 watts

HCD -RG270:

210 watts

Dimensions (w/h/d) (excl. speakers)

Approx. 280 

×

325  

430 mm

Mass (excl. speakers)
North American models:
HCD-GX555:

Approx. 10.5 kg

HCD-GX355:

Approx. 10.0 kg

Canadian model:
HCD-GX555:

Approx. 10.5 kg

HCD-GX355:

Approx. 10.0 kg

European and Russian models:
HCD-RG475:

Approx. 10.5 kg

HCD-RG270:

Approx. 8.7 kg

Other models:
HCD-RG575:

Approx. 10.5 kg

HCD-RG475:

Approx. 10.5 kg

HCD-RG270:

Approx. 10.0 kg

Design and specifications are subject to change 
without notice.

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)

3

• 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.

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

Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with

the lead free mark due to their particular size)

Unleaded solder has the following characteristics.

• Unleaded solder melts at a temperature about 40 ˚C higher

than ordinary solder.

Ordinary soldering irons can be used but the iron tip has to be

applied to the solder joint for a slightly longer time.

Soldering irons using a temperature regulator should be set to

about 350 ˚C.
Caution: The printed pattern (copper foil) may peel away if

the heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscou-s (sticky, less prone to flow)

than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may

also be added to ordinary solder.

 0

0

0

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 2 V AC range are suitable.  (See
Fig. A)

1.5 k

Ω

0.15 

µ

F

AC
voltmeter
(0.75 V)

To Exposed Metal
Parts on Set

Earth Ground

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

4

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

5

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

6

3-1.

Disassembly Flow ...........................................................

8

3-2.

Case (Top) .......................................................................

9

3-3.

Door (CD) ........................................................................

9

3-4.

Front Panel Section ......................................................... 10

3-5

Mechanical Deck (CWM43FF13) ................................... 10

3-6.

CD Mechanism Deck (CDM74KFS-F1BD81C (Except
MX model)/CDM74KFS-F1BD84 (MX model)) ........... 11

3-7.

Back Panel Section .......................................................... 11

3-8.

MAIN Board .................................................................... 12

3-9.

BD Board/CD Board ....................................................... 12

3-10. DRIVER Board, SW Board ............................................. 13
3-11. Optical Pick-up Block (KSM-215DCP) .......................... 13
3-12. SENSOR Board ............................................................... 14
3-13. MOTOR (TB) Board ....................................................... 14
3-14. MOTOR (LD) Board ....................................................... 15

.............................................................. 16

............................ 20

6-1.

Block Diagram  – CD SERVO Section – ........................ 21

6-2.

Block Diagram  – AUDIO/VIDEO Section – ................. 22

6-3.

Block Diagram  – AMP Section – ................................... 23

6-4.

Block Diagram
– PANEL, POWER SUPPLY Section – .......................... 24

6-5.

Printed Wiring Board
– CD Board – (Except MX model) ................................. 26

6-6.

Schematic Diagram
– CD Board – (Except MX model) ................................. 27

6-7.

Printed Wiring Board  – BD Board – (MX model) ......... 28

6-8.

Schematic Diagram  – BD Board – (MX model) ............ 29

6-9.

Printed Wiring Boards  – CHANGER Section – ............. 30

6-10. Schemtic Diagram  – CHANGER Setion – ..................... 31
6-11. Printed Wiring Board  – MAIN Board – ......................... 32
6-12. Schematic Diagram  – MAIN Board (1/3) – ................... 33
6-13. Schematic Diagram  – MAIN Board (2/3) – ................... 34
6-14. Schematic Diagram  – MAIN Board (3/3) – ................... 35
6-15. Printed Wiring Board  – POWER Board – ...................... 36
6-16. Schematic Diagram  –POWER Board – .......................... 37
6-17. Printed Wiring Board  – SUB WOOFER Board –

(GX555/RG475/RG575 only) ......................................... 38

6-18. Schematic Diagram  – SUB WOOFER Board –

(GX555/RG475/RG575 only) ......................................... 39

6-19. Printed Wiring Boards

– AUDIO, MIC, HEADPHONE Boards – ...................... 40

6-20. Schematic Diagram

– AUDIO, MIC, HEADPHONE Boards – ...................... 41

6-21. Printed Wiring Boards  – CD-G Section –

(MX model only) ............................................................. 42

6-22. Schematic Diagram  – CD-G Section –

(MX model only) ............................................................. 43

6-23. Printed Wiring Board  – PANEL Section (1/2) ............... 44
6-24. Printed Wiring Board  – PANEL Section (2/2) ............... 45
6-25. Schematic Diagram  – PANEL Section (1/2) .................. 46
6-26. Schematic Diagram  – PANEL Section (2/2) .................. 47
6-27. Printed Wiring Boards  – TRANS Section – ................... 48
6-28. Schematic Diagram  – TRANS Section – ....................... 49

7-1.

Overall Section ................................................................ 66

7-2.

Back Panel Section .......................................................... 67

7-3.

Front Panel Section ......................................................... 68

7-4.

Key Section ..................................................................... 69

7-5.

Chassis Section ................................................................ 70

7-6.

Transformer Section ........................................................ 71

7-7.

CD Mechanism Deck Section-1
(CDM74KFS-F1BD81C) (Except MX model)/
(CDM74KFS-F1BD84) (MX model) .............................. 72

7-8.

CD Mechanism Deck Section-2
(CDM74KFS-F1BD81C) (Except MX model)/
(CDM74KFS-F1BD84) (MX model) .............................. 73

................................ 74

•

Abbreviation
MX: Mexican model