Regulatory Information Declaration of Conformity
Trade Name: SONY Model No.: HCD-GX750 Responsible Party:Sony Electronics Inc. Address: 16450 W. Bernardo Dr, San Diego, CA 92127 U.S.A. Telephone No.: 858-942-2230 This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
NOTICE FOR THE CUSTOMERS IN THE CANADA (MHC-GX750 only)
Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Son utilisation est autorise seulement aux conditions suivantes: (1) il ne doit pas produire de brouillage et (2) lutilisateur du dispositif doit tre prt accepter tout brouillage radioelctrique reu, mme si ce brouillage est susceptible de compromettre le fonctionnement du dispositif.
NOTICE FOR THE CUSTOMERS IN THE U.S.A AND CANADA (MHC-GX750 only)
Replace the AC power adaptor with model AC-GSX100 only, if replacement is necessary.
Except for European model ENERGY STAR is a U.S. registered mark. As an ENERGY STAR partner, Sony Corporation
has determined that this product meets the ENERGY STAR guidelines for energy efficiency.

Table of Contents

How to use this manual.. 5 Playable discs.. 5 Selecting the surround effect. 23 Enhancing video game sound.. 23 Game Sync Mixing video game sound with other sound source.. 23 Game Mixing Singing along.. 24 (MHC-RG555 only)

Getting Started

Hooking up the system.. 7 Setting the clock. 10

CD/MP3 Play

Loading a disc.. 11 Playing a disc.. 11 Normal Play/Shuffle Play Playing repeatedly.. 13 Repeat Play Creating your own program. 14 Program Play
Falling asleep to music.. 25 Sleep Timer Waking up to music.. 25 Play Timer Timer recording radio programs. 26 Rec Timer
Presetting radio stations. 15 Listening to the radio.. 16 Preset Tuning Manual Tuning Using the Radio Data System (RDS). 17 (European model only)

Display

Turning off the display.. 27 Power Saving Mode Viewing information about the disc in the display.. 28 Changing the Power illuminator. 28 (MHC-GX750/GX450/RG555/ RG551S/RG444S/RG441/ RG333/RX550 only)

Tape Play

Loading a tape.. 18 Playing a tape.. 18

Optional Components

Hooking up optional components. 29 Transmitter.. 30 (MHC-GX750 only)

Tape Recording

Recording your favorite CD tracks on a tape.. 19 CD-TAPE Synchro Recording Recording on a tape manually.. 20 Manual Recording

Troubleshooting

Problems and remedies.. 33 Messages.. 36

Sound Adjustment

Adjusting the sound.. 21 Using the sub woofer.. 21 (MHC-GX750/GX450/RG551S/ RG444S/RX550 only) Selecting the sound effect. 22 Adjusting the graphic equalizer and storing.. 22 4GB

Additional Information

Precautions.. 37 Specifications.. 38 List of button locations and reference pages.. 44

How to use this manual

This manual mainly explains operations using the remote, but the same operations can also be performed using the buttons on the unit having the same or similar names.
Discs that this system cannot play
CD-ROMs CD-Rs/CD-RWs other than those recorded in the following formats: music CD format MP3 format that conforms to ISO96601) Level 1/Level 2, Joliet or Multi Session2) A disc that has a non-standard shape (e.g., card, heart). A disc with paper or stickers on it. A disc that has the adhesive, cellophane tape, or a sticker still left on it.

Playable discs

You can play back the following discs on this system. Other discs cannot be played back.

List of playable discs

Format of discs Disc logo

Audio CDs

CD-R/CD-RW (audio data/MP3 files*)
* MHC-GX750/GX450/RG555/RG551S/RG444S/ RG441/RG333/RG222/RG221/RX550 only
ISO9660 Format The most common international standard for the logical format of files and folders on a CD-ROM. There are several specification levels. In Level 1, file names must be in the 8.3 format (no more than eight characters in the name, no more than three characters in the extension.MP3) and in capital letters. Folder names can be no longer than eight characters. There can be no more than eight nested folder levels. Level 2 specifications allow file names and folder names up to 31 characters long. Each folder can have up to 8 trees. For Joliet in the expansion format (file and folder names can have up to 64 characters) make sure of the contents of the writing software, etc. Multi Session This is a recording method that enables adding of data using the Track-At-Once method. Conventional CDs begin at a CD control area called the Lead-in and end at an area called Lead-out. A Multi Session CD is a CD having multiple sessions, with each segment from Lead-in to Lead-out regarded as a single session. CD-Extra: This format records audio (audio CD data) on the tracks in session 1 and data on the tracks in session 2. Mixed CD: This format records data on the first track and audio (audio CD data) on the second and subsequent tracks of a session.

After a few seconds later, STANDBY disappears and LOCK appears.

Unplug the power cord.

Setting the clock
Use buttons on the remote for the operation.
Press ?/1 to turn on the system. Press CLOCK/TIMER SET. Press. or > repeatedly to set the hour. Press ENTER. Press. or > repeatedly to set the minute. Press ENTER.
The clock starts working.

To adjust the clock

Press CLOCK/TIMER SET. Press. or > repeatedly to select CLOCK SET, then press ENTER. Do the same procedures as step 3 to 6 above.
The clock settings are canceled when you disconnect the power cord or if a power failure occurs. You cannot set the clock in Power Saving Mode (page 27).

Playing a disc

Normal Play/Shuffle Play
This system lets you play audio CDs and discs with MP3 audio tracks. MP3 audio tracks cannot be played on MHC-GX250, MHC-RG121 and MHC-RG100.
Example: When a disc is loaded
Disc tray number Track number

Loading a disc

Use buttons on the unit for the operation.
Press Z. Place a disc with the label side up on the disc tray.

Disc presence indicator

Playing time
To insert additional discs, press DISC SKIP/EX-CHANGE to rotate the disc tray.
Press CD (or FUNCTION repeatedly) to switch the function to CD.
Press Z again to close the disc tray.
Do not use a disc with tape, seals or paste on it as this may cause malfunction. Do not forcibly press the disc tray closed with your finger, as this may cause malfunction.
Press PLAY MODE repeatedly in stop mode until the mode you want appears in the display.

Select To play

Other operations

To Do this

Stop play Pause Select a track Select an album of MP3 Find a point in a track* Select a disc in stop mode Switch to CD function from other function Exchange other discs while playing Remove a disc
Press x. Press X. Press again to resume play. Press. or > repeatedly (or turn l L on the unit). Press ALBUM or + repeatedly after step 2. Keep pressing m or M during playback and release it at the desired point. Press DISC SKIP (or DISC or DISC SKIP/EX-CHANGE on the unit). Press DISC on the unit (Automatic Source Selection). Press DISC SKIP/EX-CHANGE on the unit. Press Z on the unit.

You cannot select REP and ALL DISCS SHUF at the same time. When you select REP1, that track is repeated endlessly until REP1 is canceled.
Creating your own program

Program Play

You can make a program of up to 25 steps from all the discs in the order you want to play them. You can synchro record the programmed tracks onto a cassette tape (page 19). MP3 audio tracks cannot be played on MHC-GX250, MHC-RG121 and MHC-RG100.
Program additional tracks.

To program Repeat steps

Other tracks on the 4 and 5 same disc Other tracks on other discs 3 to 5

Program Play starts.

Press CD (or FUNCTION repeatedly) to switch the function to CD. Press PLAY MODE repeatedly in stop mode until PGM appears. Press DISC SKIP (or DISC or DISC SKIP/EX-CHANGE on the unit) to select a disc. Press. or > repeatedly (or turn l L on the unit) until the desired track number appears.
Cancel Program Play Clear a track from the end
Press PLAY MODE repeatedly in stop mode until PGM disappears. Press CLEAR in stop mode.
When programming the MP3 audio tracks, press ALBUM or + to select album, then press. or > repeatedly (or turn l L on the unit) until the desired track number appears.
Disc tray number Selected track number
The program you made remains after Program Play finishes. To play the same program again, press CD (or FUNCTION repeatedly) to switch the function to CD, then press N. However, the program is cleared when you open the disc tray. . appears when the total CD program time exceeds 100 minutes, or when you select a CD track whose number is 21 or over, or when you select an MP3 audio track.
Total playing time (including selected track)

Press ENTER.

The track is programmed. The program step number appears, followed by the total playing time.
Press or + (or TUNING or + on the unit) repeatedly to select the desired preset number. Press ENTER. Repeat steps 2 through 7 to store other stations.
Presetting radio stations
You can preset up to 20 FM stations and 10 AM stations. You can then tune in any of those stations simply by selecting the corresponding preset number.

Manual tuning preset

You can manually tune in and store the radio frequency of the desired stations.

Automatic tuning preset

You can automatically tune in all of the stations that can be received in your area and then store the radio frequency of the desired stations.
Press TUNER BAND (or FUNCTION repeatedly) to switch the function to tuner. Press TUNER BAND repeatedly to select FM or AM. Press TUNING MODE repeatedly until AUTO and PRESET disappear from the display. Press or + (or TUNING or + on the unit) repeatedly to tune in the desired station. Press TUNER MEMORY.

Deck B stands by for recording. REC flashes.

Press REC PAUSE/START.

Recording starts.

To stop recording

Press x.
To record a disc by specifying track order
You can record only your favorite CD tracks using Program Play. Between steps 3 and 4, perform steps 2 to 6 of Creating your own program (page 14).
Recording on a tape manually

Manual Recording

You can record just the portions you like from a CD, tape or radio program on a tape. You can also record from connected components (see Hooking up optional components on page 29). Use buttons on the unit for the operation.
For MHC-RG555, if you select both sides recording and the tape reaches the end of the front side part-way through a track, the entire track is recorded again from the beginning of the reverse side.
Press one of the following buttons to select the desired source to record.
CD: To record from this systems CD player. TAPE A/B: To record from this systems tape deck A. TUNER/BAND: To record from this systems tuner. GAME: To record from the connected video game machine to GAME INPUT AUDIO L/R jacks. VIDEO/MD*: To record from the connected VCR or MD to VIDEO/MD IN jacks.

* MHC-RG555 only

Press REC PAUSE/START, then start playing the desired source to record.
You cannot listen to other sources while recording.

Adjusting the sound

You can reinforce the bass and create a more powerful sound.
Press GROOVE on the unit.
For MHC-RG555, when you record on both sides, be sure to start from the front side. If you start from the reverse side, recording stops at the end of the reverse side. For recording from the tuner: If noise is heard while recording from the tuner, move the respective antenna to reduce the noise.
Each time you press the button, the display changes cyclically as follows: GROOVE ON* t GROOVE OFF
* The volume switches to power mode, the equalizer curve changes, and GROOVE lights up.

Using the sub woofer

(MHC-GX750/GX450/RG551S/RG444S/ RX550 only)
You can use the sound of the sub woofer to suit the sound source.
Press SUB WOOFER ON/OFF on the sub woofer.
The indicator lights up while the sub woofer turns on. Press the button again to turn off the sub woofer.
You can use VOLUME +/ (or VOLUME control on the unit) to adjust the volume of the sub woofer linked to the front speakers.

Selecting the sound effect
Selecting the effect from the music menu
Press EQ (or PRESET EQ on the unit) repeatedly to select the preset you desire.
Adjusting the graphic equalizer and storing
You can adjust the sound by raising or lowering the levels of specific frequency ranges, then store up to three personal files (P FILE) in the memory. Before operation, first select the audio emphasis you want for your basic sound. Use buttons on the unit for the operation.
The preset name appears in the display. See the chart Sound effect options.
To cancel the sound effect
Press EFFECT ON/OFF on the unit.

Sound effect options

SURR appears if you select an effect with surround effects.

EQ Effect

Press EQ BAND repeatedly to select a frequency band, then turn EQ + to adjust the level.
Frequency band Frequency level
ROCK POP JAZZ DANCE SOUL ORIENTAL MOVIE EQ GAME EQ

Standard music sources

Soundtracks and special listening situations PlayStation 1, 2 and other video game music sources

Press and hold P FILE.

A personal file number appears.
Press P FILE repeatedly to select P FILE you want to store the equalizer setting. Press ENTER.
COMPLETE appears. This setting is automatically stored as the personal file you selected in step 3.

To Press

Call up a personal file
P FILE repeatedly to select the desired personal file number.
Cancel a personal EFFECT ON/OFF repeatedly file until EFFECT OFF appears.
Selecting the surround effect
Press SURROUND on the unit.
Mixing video game sound with other sound source

Game Mixing

Each time you press the button, the display changes as follows: SURROUND ON (SURR) Y SURROUND OFF (off)
Select the desired source sound. Press GAME MIXING.
Enhancing video game sound

Game Sync

You need to connect a video game machine (see Hooking up optional components on page 29).

Press GAME on the unit.

Each time you press the button, the level of the game sound changes cyclically as follows: MIXING LOW t MIXING MID t MIXING HIGH t MIXING OFF
If you start recording while Game Mixing is activated, Game Mixing is canceled. To record the mixed sound, press GAME MIXING after step 4 of Recording on a tape manually on page 20, and then press REC PAUSE/START to start the recording. The game sound is not output while the tape deck is performing the AMS operation (page 19).

Falling asleep to music

Sleep Timer
You can set the system to turn off after a certain time, so that you can fall asleep to music.

Press SLEEP.

Prepare the sound source you want to play.
Each time you press the button, the minute display (the turn-off time) changes cyclically as follows: AUTO* t 90MIN t 80MIN t 70MIN t t 10MIN t OFF
* The system automatically turns off in 100 minutes or after the current disc or tape finishes playing.
CD: Load a disc. To start from a specific track, make a program (see Creating your own program on page 14). Tape: Load a tape with the side you want to play facing forward. Tuner: Tune in the preset radio station (see Listening to the radio on page 16).
Press VOLUME +/ to adjust the volume. Press CLOCK/TIMER SET. Press. or > repeatedly to select PLAY SET, then press ENTER.
Check the remaining time* Change the time to turn off
SLEEP once. SLEEP repeatedly to select the time you want.
Cancel the Sleep SLEEP repeatedly until SLEEP Timer Function OFF appears. * You cannot check the remaining time if you select AUTO.
ON appears and the hour indication flashes.
Set the time to start playing.
Do not set to AUTO during Synchro Recording on a tape.
Press. or > repeatedly to set the hour, then press ENTER. The minute indication flashes. Press. or > repeatedly to set the minute, then press ENTER.
You can use the Sleep Timer, even if you have not set the clock.
Set the time to stop playing following the same procedure as step 5. Press. or > repeatedly until the desired sound source appears.
Each time you press the button, the display changes cyclically as follows:
t TUNER y CD PLAY T t TAPE PLAY T
The type of timer (PLAY TIMER), the start time, the stop time, and the sound source appear in turn, before the original display returns.
Timer recording radio programs

Rec Timer

You can record a preset radio station from a specified time. To timer record, you must first preset the radio station (see Presetting radio stations on page 15) and set the clock (see Setting the clock on page 10). Use buttons on the remote for the operation.
Press ?/1 to turn off the system.

Check the setting

1 Press CLOCK/TIMER

SELECT.

2 Press. or >
repeatedly until PLAY SELECT appears, then press ENTER. Change the setting Cancel the timer Start over from step 1.
Tune in the preset radio station (see Listening to a preset station on page 16). Press CLOCK/TIMER SET. Press. or > repeatedly to select REC SET, then press ENTER.
repeatedly until TIMER OFF appears, then press ENTER.
Set the time to start recording.
You cannot activate the Play Timer and the Rec Timer at the same time. If you use the Play Timer and the Sleep Timer at the same time, the Sleep Timer has priority. If the system is on at the preset time, the Play Timer will not be activated.

The system turns on 15 seconds before the preset time.
Set the time to stop recording following the same procedure as step 4.
The type of timer (REC TIMER), the start time, the stop time, and the preset radio station to be recorded (e.g., TUNER FM 5) appear in turn, before the original display returns.
Load a recordable tape into deck B. Press ?/1 to turn off the system.
repeatedly until REC SELECT appears, then press ENTER. Change the setting Cancel the timer Start over from step 1.

Turning off the display

Power Saving Mode
The demonstration display (display window and buttons lighting and flashing even when the system power is off) and the clock display can be turned off to minimize the amount of power consumed during standby (Power Saving Mode).
Press DISPLAY repeatedly while the system is off until the demonstration display or the clock display disappears. To cancel Power Saving Mode
You cannot activate the Play Timer and the Rec Timer at the same time. If you use the Rec Timer, the Play Timer and the Sleep Timer at the same time, the Sleep Timer has priority. If the system is on at the preset time, the Rec Timer will not be activated. The volume is reduced to minimum during recording.
Press DISPLAY while the system is off. Each time you press the button, the display switches cyclically as follows: Demonstration display t Clock display* t No display (Power Saving Mode)
* The clock is displayed only if you set the clock.
You cannot perform the following operations in Power Saving Mode. setting the clock changing the AM tuning interval (except for European, Russian and Saudi Arabian models) turning on the system by pressing the function buttons (e.g., CD)
The timer continues to operate in Power Saving Mode. ?/1 indicator lights up even in Power Saving Mode.
Viewing information about the disc in the display
You can check the playing time and remaining time of the current track or that of the disc.
x When a CD/MP3 is in Program Play mode
The last track number of the program and the total playing time t Total track number of the program (for five seconds) t Volume label* t Clock display (for eight seconds) t Effect status
* For discs with MP3 audio tracks
Checking the remaining time and titles (CD/MP3)
Press DISPLAY during Normal Play.
Checking the station name (TUNER)
Press DISPLAY while listening to the radio.
Each time you press the button, the display changes cyclically as follows: Current track number and elapsed playing time t Current track number and remaining time1) t Remaining time of the disc2) t Track title (disc with MP3 audio tracks3) only) t Album name (disc with MP3 audio tracks only) t Clock display (for eight seconds) t Effect status
Each time you press the button, the display changes cyclically as follows: Station name1) t Preset number2) and frequency t Clock display (for eight seconds) t Effect status

C VIDEO OUT jack

Use a video cable (not supplied) to connect the video input of TV to this jack.
From the audio output of the VCR or MD deck VCR or MD deck
The video game machine image may appear on the TV screen even if the system is turned off. See Selecting the surround effect on page 23 for video game sound effects. If you press GAME on the unit while the system is off, the system turns on, the function switches to GAME, and the equalizer also switches to GAME EQ. If you press GAME on the unit while the system is on, the function switches to GAME and the equalizer automatically switches to GAME EQ in the same manner.

Transmitter

(MHC-GX750 only)
Hooking up the transmitter
Set the transmitter by the following procedures.
Listening to audio from a connected component (MHC-RG555 only)
Select either AUDIO IN A or AUDIO IN B hookup depending on the jack type of the optional component you want to connect the transmitter to. If noise occurs when the transmitter is connected to the headphones jack of your TV or VCR, set the NOISE FILTER switch on the transmitter to ON.
Listening to a connected VCR
Connect the audio cords. See Hooking up optional components on page 29. Press VIDEO/MD. Start playing the connected component.

OFF ON NOISE FILTER

DC IN 9V

AUDIO IN

CHANNEL
to AUDIO IN B jack Right channel (red)
to AUDIO IN A jacks Left channel (white)
Listening to a connected MD deck
Connect the audio cords. See Hooking up optional components on page 29. Press VIDEO/MD. Hold down VIDEO/MD and press ?/1. This switches the VIDEO function to MD. Once you enable the MD function, just press VIDEO/MD.
Connecting cord (supplied) Left channel (white) Right channel (red)
Unimatch plug adaptor (not supplied)
If you cannot select MD when you press VIDEO/ MD, press ?/1 while holding down VIDEO/MD when the system is on. VIDEO will be switched to MD. To return to VIDEO, do the same procedure. When you connect a VIDEO CD deck, set to MD.
to LINE OUT or REC OUT jack Optional Components (TV, VCR, Personal computer, etc.)
to headphones (stereo phone jack) or LINE OUT jack (stereo mini jack)

On placement

Do not place the system in an inclined position. Do not place the system in locations where it is; Extremely hot or cold Dusty or dirty Very humid Subject to vibrations Subject to direct sunlight. Use caution when placing the unit or speakers on surfaces that have been specially treated (with wax, oil, polish, etc.) as staining or discoloration of the surface may result.

On heat buildup

Although the system heats up during operation, this is not a malfunction. Place the system in a location with adequate ventilation to prevent heat buildup in the system. If you continuously use this system at a high volume, the cabinet temperature of the top, side and bottom rises considerably. To avoid burning yourself, do not touch the cabinet. To prevent a malfunction, do not cover the ventilation hole for the cooling fan.

Cleaning the cabinet

Clean the cabinet, panel and controls with a soft cloth slightly moistened with mild detergent solution. Do not use any type of abrasive pad, scouring powder or solvent such as thinner, benzine or alcohol.

Specifications

Main unit Amplifier section AUDIO POWER SPECIFICATIONS (MHC-GX750/GX450/GX250/RX550 USA models only) MHC-GX750/RX550 POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
To save a tape permanently
To prevent a tape from being accidentally recorded over, break off the cassette tab from side A or B as illustrated.
Break off the cassette tab
If you later want to reuse the tape for recording, cover the broken tab with adhesive tape.
With 6 ohm loads, both channels driven, from 120 10,000 Hz: rated 160 watts per channel minimum RMS power, with no more than 10% total harmonic distortion from 250 milliwatts to rated output.
MHC-GX450 POWER OUTPUT AND TOTAL HARMONIC DISTORTION:
Before placing a cassette in the tape deck
Take up any slack in the tape. Otherwise, the tape may get entangled in the parts of the tape deck and become damaged.
When using a tape longer than 90 minutes
The tape is very elastic. Do not change the tape operations such as play, stop, and fast-winding frequently. The tape may get entangled in the tape deck.
With 6 ohm loads, both channels driven, from 120 10,000 Hz: rated 125 watts per channel minimum RMS power, with no more than 10% total harmonic distortion from 250 milliwatts to rated output.

MHC-GX250 POWER OUTPUT AND TOTAL HARMONIC DISTORTION:

Cleaning the tape heads

Clean the tape heads after every 10 hours of use. Be sure to clean the tape heads before you start an important recording or after playing an old tape. Use a separately sold dry-type or wet-type cleaning cassette. For details, refer to the instructions of the cleaning cassette.
With 6 ohm loads, both channels driven, from 120 10,000 Hz: rated 140 watts per channel minimum RMS power, with no more than 10% total harmonic distortion from 250 milliwatts to rated output.
North American models: MHC-GX750/RX550
Front speaker Continuous RMS power output (reference): 160 + 160 watts (6 ohms at 1 kHz, 10% THD) Total harmonic distortion less than 0.07% (6 ohms at 1 kHz, 80 W) Sub woofer Continuous RMS power output (reference): 180 watts (6 ohms at 50 Hz, 10% THD) Total harmonic distortion less than 0.07% (6 ohms at 50 Hz, 90 W)
Demagnetizing the tape heads
Demagnetize the tape heads and the metal parts that have contact with the tape after every 20 to 30 hours of use with a separately sold demagnetizing cassette. For details, refer to the instructions of the demagnetizing cassette.

MHC-GX450

Front speaker Continuous RMS power output (reference): 125 + 125 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): 150 watts (6 ohms at 50 Hz, 10% THD) Total harmonic distortion less than 0.07% (6 ohms at 50 Hz, 75 W)

MHC-RG222/RG121

DIN power output (rated): 50 + 50 watts (6 ohms at 1 kHz, DIN) Continuous RMS power output (reference): 65 + 65 watts (6 ohms at 1 kHz, 10% THD) Music power output (reference): 130 + 130 watts (6 ohms at 1 kHz, 10% THD)

MHC-RG100

DIN power output (rated): 15 + 15 watts (6 ohms at 1 kHz, DIN) Continuous RMS power output (reference): 20 + 20 watts (6 ohms at 1 kHz, 10% THD) Music power output (reference): 40 + 40 watts (6 ohms at 1 kHz, 10% THD)

MHC-GX250

Continuous RMS power output (reference): 140 + 140 watts (6 ohms at 1 kHz, 10% THD) Total harmonic distortion less than 0.07% (6 ohms at 1 kHz, 70 W)
Other models: European and Russian models: MHC-RG444S
Front speaker 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) Music power output (reference): 240 + 240 watts (6 ohms at 1 kHz, 10% THD) Sub woofer DIN power output (rated): 100 watts (6 ohms at 60 Hz, DIN) Continuous RMS power output (reference): 120 watts (6 ohms at 50 Hz, 10% THD) Music power output (reference): 240 watts (6 ohms at 50 Hz, 10% THD)

Tuner section

FM stereo, FM/AM superheterodyne tuner FM tuner section Tuning range North American model: Russian model:
Other models: Antenna Antenna terminals Intermediate frequency AM tuner section Tuning range Pan-American models:
87.5 108.0 MHz (100-kHz step) 65.0 74.0 MHz (There is no stereo effect. 10-kHz step) 87.5 108.0 MHz (50-kHz step) 87.5 108.0 MHz (50-kHz step) FM lead antenna 75 ohms unbalanced 10.7 MHz

CD player section

System Laser Compact disc and digital audio system Semiconductor laser (=780 nm) Emission duration: continuous 2 Hz 20 kHz (0.5 dB) nm More than 90 dB More than 90 dB
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 Antenna terminals External antenna terminal Intermediate frequency 450 kHz
Frequency response Wavelength Signal-to-noise ratio Dynamic range

Speaker

North American models: Front speaker SS-RG555 for MHC-GX750/ RX550
Speaker system Speaker units Woofer: Sub woofer: Tweeter: Nominal impedance Dimensions (w/h/d) Mass 3-way, 3-unit, bass-reflex type 15 cm, cone type 15 cm, cone type 5 cm, cone type 6 ohms Approx. 295 mm Approx. 5.1 kg net per speaker
European and Russian models: Front speaker SS-RG444 for MHC-RG444S/ RG222
Speaker system Speaker units Woofer: Sub woofer: Tweeter: Nominal impedance Dimensions (w/h/d) Mass 3-way, 3-unit, bass-reflex type 13 cm, cone type 13 cm, cone type 5 cm, cone type 6 ohms Approx. 235 mm Approx. 3.7 kg net per speaker
Sub woofer SS-WG450 for MHC-RG444S
Speaker system Speaker units Woofer: Nominal impedance Dimensions (w/h/d) Mass Bass-reflex type 20 cm, cone type 6 ohms Approx. 365 mm Approx. 5.7 kg
Sub woofer SS-WG750 for MHC-GX750/ RX550

Other models: MHC-RG555: MHC-RG551S: MHC-RG441: MHC-RG222: MHC-RG221: MHC-RG121:
Dimensions (w/h/d) incl. projecting parts and controls Amplifier/Tuner/Tape/CD section: Approx. 425 mm Transmitter (MHC-GX750 only) Approx. 103 mm Mass North American models: HCD-GX750: Approx. 10.5 kg HCD-GX450: Approx. 10.0 kg HCD-GX250: Approx. 10.0 kg HCD-RX550: Approx. 10.5 kg European and Russian models: HCD-RG444S: Approx. 10.0 kg HCD-RG333: Approx. 10.0 kg HCD-RG222: Approx. 8.5 kg HCD-RG121: Approx. 8.5 kg HCD-RG100: Approx. 8.0 kg Other models: HCD-RG555: Approx. 10.0 kg HCD-RG551S: Approx. 10.5 kg HCD-RG441: Approx. 10.0 kg HCD-RG222: Approx. 10.0 kg HCD-RG221: Approx. 10.0 kg HCD-RG121: Approx. 8.5 kg Transmitter (MHC-GX750 only) Approx. 146 g
Remote Commander (1) R6 (Size AA) batteries (2) AM loop antenna (1) FM lead antenna (1) Transmitter (MHC-GX750 only) (1) AC adaptor (MHC-GX750 only) (1) Connecting cord phono plug-stereo miniplug (1m) (MHC-GX750 only) (1) Speaker pads MHC-GX750/GX450/ RG551S/RG444S/ RX550 (12) MHC-GX250/RG555/ RG441/RG333/RG222/ RG221/RG121/RG100 (8)
Design and specifications are subject to change without notice.
List of button locations and reference pages

How to use this page

Use this page to find the location of buttons and other parts of the system that are mentioned in the text.

Illustration number r

TAPE A/B ed (18, 19, 20, 24)
R Name of button/part R Reference page

Main unit

ALPHABETICAL ORDER AO PZ BUTTON DESCRIPTIONS
ALBUM +1) qh (12, 14, 19) ALBUM 1) wg (12, 14, 19) CD eg (9, 11, 14, 19, 20) CD SYNC wj (19) Deck A wk (18) Deck B qj (18, 19, 20, 24) DISC q; (12, 14, 35) DISC SKIP/EX-CHANGE qs (11, 12, 14, 19) Disc tray 9 (11) DISPLAY 2 (17, 27, 28) Display window 5 EFFECT ON/OFF 8 (22, 22) ENTER qa (14, 15, 22) EQ BAND 7 (22) GAME es (20, 23, 30) GAME INPUT AUDIO L/R jacks wd (20, 29) GAME INPUT VIDEO jack wf (29) GAME MIXING wh (23) GROOVE 8 (21) ILLUMINATION2) 3 (28) MIC jack3) ws (24) MIC LEVEL3) wa (24) Operation Dial ( EQ +/l L) 6 (12, 14, 19, 22)
P FILE qd (22) PHONES jack ql PLAY MODE wl (12, 14, 18, 19, 20, 35) Power illuminator2) qk (28) PRESET EQ qd (22) REC PAUSE/START wj (19, 20, 23, 24) Remote sensor 4 SURROUND 8 (23) TAPE A/B ed (18, 19, 20, 24) TUNER/BAND ef (15, 16, 20) TUNING MODE wl (15, 16, 35) TUNING + qh (15, 16) TUNING wg (15, 16) VIDEO/MD3) ea (20, 30) VOLUME control w; (21) WIRELESS4) ea (32)
?/1 (power) 1 (8, 16, 27, 30, 33, 35) X (pause) wg (12, 19) Z (eject) qf (11) PUSH Z (deck B) (eject) qg (18) x (stop) wg (12, 19, 19, 24, 35) M (fast forward) qh (12, 19) H or hH3) (play) qh (12, 18, 19) m (rewind) wg (12, 19) Z PUSH (deck A) (eject) e; (18) 1) MHC-GX750/GX450/RG555/ RG551S/RG444S/RG441/ RG333/RG222/RG221/RX550 only 2) MHC-GX750/GX450/RG555/ RG551S/RG444S/RG441/ RG333/RX550 only 3) MHC-RG555 only 4) MHC-GX750 only

MHC-GX250

SERVICE MANUAL

Ver 1.0 2004.03

US Model Canadian Model
MHC-GX250 is composed of following models. As for the service manual, it is issued for each component model, then, please refer to them.

COMPONENT MODEL NAME

COMPACT DISC DECK RECEIVER SYSTEM FRONT SPEAKER SYSTEM MHC-GX250 HCD-GX250 SS-RG444

PARTS LIST

Part No. 1-478-519-11 1-754-094-12 1-754-243-11 4-210-254-02 4-252-491-11 4-252-491-21 Description Remarks COMMANDER, STANDARD (RM-SC1) (INCLUDING BATTERY COVER) ANTENNA, LOOP (AM) ANTENNA (FM) CUSHION (FOOT)(FOR SPEAKER) MANUAL, INSTRUCTION (ENGLISH) MANUAL, INSTRUCTION (FRENCH)(Canadian model)
MINI Hi-Fi COMPONENT SYSTEM

9-877-536-01

2004C16-1 2004.03

Sony Corporation

Home Audio Company Published by Sony Engineering Corporation