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SERVICE MANUAL
Ver. 1.1 2005.04
US Model
Canadian Model
MHC-GX355/GX555
AEP Model
UK Model
Australian Model
MHC-RG270/RG475S
E Model
MHC-RG270/RG475S/RG575S
MHC-GX355/GX555/RG270/
RG475S/RG575S
9-879-534-02
2005D05-1
© 2005.04
Sony Corporation
Personal Audio Group
Published by Sony Engineering Corporation
MINI HI-FI COMPONENT SYSTEM
· MHC-GX355/GX555/RG270/RG475S/RG575S are
composed of the following models.
As service manuals are issued for each component
model, please refer to them.
ACCESSORIES
Part No.
Description
Remark
SPECIFICATIONS
COMPONENT MODEL NAME
1-754-102-31 ANTENNA, LOOP (LW.MW)
1-754-243-11 ANTENNA (FM)
1-751-619-13 CORD, CONNECTION (VIDEO CABLE) (MX)
2-055-382-01 BATTERY COVER (for RM-SC3)
2-159-896-01 CUSHION (FOOT) (SPEAKER PADS) (8 pieces)
(MHC-GX355/RG270)
2-580-011-13 MANUAL, INSTRUCTION (ENGLISH) (EXCEPT EE, MX)
2-580-011-23 MANUAL, INSTRUCTION (FRENCH)
(CND, AEP, E2, E3, SP, EA)
2-580-011-33 MANUAL, INSTRUCTION (SPANISH)
(AEP, E51, MX, E2, SP, AR)
2-580-011-42 MANUAL, INSTRUCTION (GERMAN, DUTCH) (AEP)
2-580-011-52 MANUAL, INSTRUCTION (ITALIAN, PORTUGUESE) (AEP)
2-580-011-62 MANUAL, INSTRUCTION (SWEDISH, DANISH, FINNISH)
(EE)
2-580-011-72 MANUAL, INSTRUCTION (POLISH, CZECH, HUNGARIAN,
GREEK) (EE)
2-580-011-82 MANUAL, INSTRUCTION (RUSSIAN) (RU)
2-580-011-92 MANUAL, INSTRUCTION (ARABIC) (E3, EA)
2-580-012-12 MANUAL, INSTRUCTION (TRADITIONAL CHINESE) (SP)
2-593-196-01 CUSHION (FOOT-12) (SPEAKER PADS) (12 pieces)
(MHC-GX555/RG475S/RG575S)
A-1060-760-A OVERALL ASSY (RM-SC3)
MHC-GX355
MHC-GX555
MHC-RG270
MHC-RG475S
MHC-RG575S
Compact Disc Deck Receiver
HCD-GX355
HCD-GX555
HCD-RG270
HCD-RG475
HCD-RG575
SS-RG475
SS-RG575
Front Speaker
SS-GX555
(Except Mexican)
SS-RG475
(Except Mexican)
SS-RG475AV
SS-RG575AV
(Mexican)
(Mexican)
Sub woofer
­
SS-WG555
­
SS-WG475
SS-WG575
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:
MHC-GX555:
285 watts
MHC-GX355:
210 watts
Canadian model:
MHC-GX555:
380 VA
MHC-GX355:
290 VA
European and Russian models:
MHC-RG475S:
300 watts
0.25 watts (at the Power
Saving Mode)
MHC-RG270:
190 watts
0.25 watts (at the Power
Saving Mode)
Mexican model:
MHC-RG575S:
300 watts
MHC-RG270:
210 watts
Other models:
MHC-RG575S:
300 watts
MHC-RG475S:
300 watts
MHC-RG270:
210 watts
Dimensions (w/h/d) (excl. speakers)
Approx. 280
× 325 ×
430 mm
Mass (excl. speakers)
North American model:
MHC-GX555:
Approx. 10.5 kg
MHC-GX355:
Approx. 10.0 kg
Canadian model:
MHC-GX555:
Approx. 10.5 kg
MHC-GX355:
Approx. 10.0 kg
European and Russian models:
MHC-RG475S:
Approx. 10.5 kg
MHC-RG270:
Approx. 8.7 kg
Other models:
MHC-RG575S:
Approx. 10.5 kg
MHC-RG475S:
Approx. 10.5 kg
MHC-RG270:
Approx. 10.0 kg
Supplied accessories
Remote Commander (1)
R6 (Size AA) batteries (2)
AM loop antenna (1)
FM lead antenna (1)
Video cable (Mexican
model only) (1)
Speaker pads
MHC-GX555/RG575S/
RG475S (12)
MHC-GX355/RG270 (8)
Design and specifications are subject to change
without notice.
· Abbreviation
CND : Canadian model
AR
: Argentine model
E2
: 120V AC Area in E model
E3
: 240V AC Area in E model
E51 : Chilean and Peruvian model
EA
: Saudi Arabia model
EE
: East European model
MX : Mexican model
RU
: Russian model
SP
: Singapore model


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2
MHC-GX355/GX555/RG270/RG475S/RG575S
REVISION HISTORY
Clicking the version allows you to jump to the revised page.
Also, clicking the version at the upper right on the revised page allows you to jump to the next revised
page.
Ver.
Date
Description of Revision
1.0
2005.03
New
1.1
2005.04
Addition of Argentine and Saudi Arabia models (MHC-RG270)
Addition of Argentine and Singapore models (MHC-RG575S)


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SERVICE MANUAL
COMPACT DISC DECK RECEIVER
US Model
Canadian Model
HCD-GX355/GX555
AEP Model
UK Model
Australian Model
HCD-RG270/RG475
E Model
HCD-RG270/RG475/RG575
HCD-GX355/GX555/
RG270/RG475/RG575
Ver. 1.4 2005.10
SPECIFICATIONS
9-879-533-05
2005J05-1
© 2005.10
Sony Corporation
Personal Audio Group
Published by Sony Engineering Corporation
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.
Amplifier section
AUDIO POWER SPECIFICATIONS
(HCD-GX555/GX355 USA model only)
HCD-GX555
POWER OUTPUT AND TOTAL HARMONIC
DISTORTION:
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.
HCD-GX355
POWER OUTPUT AND TOTAL HARMONIC
DISTORTION:
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.
North American model:
HCD-GX555
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
1kHz, 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)
HCD-GX355
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
1kHz, 80 W)
European and Russian models:
HCD -RG475
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


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HCD-GX355/GX555/RG270/RG475/RG575
Other models:
HCD-RG5 75
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
1kHz, DIN)
Continuous RMS power output (reference):
125 + 125 watts (6 ohms at
1kHz, 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)
HCD-RG4 75
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
1kHz, DIN)
Continuous RMS power output (reference):
120 + 120 watts (6 ohms at
1kHz, 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)
HCD-RG270
The following measured at AC 120, 127, 220, 240 V
50/60 Hz
DIN power output (rated): 100 + 100 watts (6 ohms at
1kHz, DIN)
Continuous RMS power output (reference):
125 + 125 watts (6 ohms at
1kHz, 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
8ohms 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
CD player section
System
Compact disc and digital
audio system
Laser Diode Properties
Emission duration:
continuous
Laser Output*:
Less than 44.6
µW
*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
Tape deck section
Recording system
4-track 2-channel, stereo
Frequency response
50 ­ 13,000 Hz (
±3 dB),
using Sony TYPE I
cassettes
Tuner section
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
9kHz)
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
General
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.
HCD -RG270
DIN power output (rated): 80 + 80 watts (6 ohms at
1kHz, DIN)
Continuous RMS power output (reference):
100 + 100 watts (6 ohms at
1kHz, 10% THD)
Music power output (reference):
200 + 200 watts (6 ohms at
1kHz, 10% THD)


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HCD-GX355/GX555/RG270/RG475/RG575
Notes on chip component replacement
· Never reuse a disconnected chip component.
· Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
· 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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation
exposure.
UNLEADED SOLDER
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)
: LEAD FREE MARK
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.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN
THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.
REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE
PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR
IN SUPPLEMENTS PUBLISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR
LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES
PIÈCES
SONT
CRITIQUES
POUR
LA
SÉCURITÉ
DE
FONCTIONNEMENT. NE REMPLACER CES COM- POSANTS
QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT
DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS
PUBLIÉS PAR SONY.
SAFETY CHECK-OUT
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.
LEAKAGE TEST
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)
Fig. A.
Using an AC voltmeter to check AC leakage.
1.5 k
0.15
µF
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.