DOWNLOAD Sony HCD-GT220 / HCD-GT440 / HCD-GT660 / MHC-GT220 / MHC-GT440 / MHC-GT660 Service Manual ↓ Size: 5.57 MB | Pages: 94 in PDF or view online for FREE

The laser diode in the optical pick-up block may suffer electrostat-
ic 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 fl exible board is easily damaged and should be handled with 
care.

NOTES  ON  LASER  DIODE  EMISSION  CHECK
The laser beam on this model is concentrated so as to be focused 
on the disc refl ective surface by the objective lens in the optical 
pickup block. Therefore, when checking the laser diode emission, 
observe from more than 30 cm away from the objective lens.

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)

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 viscous (sticky, less prone to fl ow) 
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.

RELEASING  THE  ANTITHEFT  LOCK
The disc table lock function for the antitheft of an demonstration 
disc in the store is equipped.

Releasing Procedure:
1.  Press the [

?/1

] button to turn the power on.

2.  Press the [CD] button to select “CD”.
3.  While pressing the [

x

] button, press the [

Z

] button until “UN-

LOCKED” displayed on the fl uorescent indicator tube (around 
5 seconds).

Note: When 

“

LOCKED

”

 is displayed, the antitheft lock is not released 

by turning power on/off with the

 [

?/1

]

 button.

Note:  Work after removing the side panel refering to SECTION 3 DIS-

ASSEMBLY (page 7).

SERVICE  POSITION
In checking the CD mechanism deck, prepare jig (extension cable J-2501-248-A (27 core/300 mm))/J-2501-077-A (13 core/300 mm)

This section is extracted 
from instruction manual.

also be performed using the buttons on the unit having the same or similar names.

* HCD-GT440 only

/ (on/standby)

Press to turn on the system.

Unit: STANDBY indicator

Remote sensor

DISPLAY

Press to change the information on the
display.

Unit: ILLUMINATION

Press to change the illumination pattern
around MASTER VOLUME

RH

.

CD

Press to select the CD function.

TUNER/BAND

Press to select the TUNER function.
Press to select FM or AM reception
mode.

Unit: TAPE A/B

Press to select the TAPE function. Press
to select TAPE A or TAPE B.

Unit: AUDIO

Press to select the AUDIO function.

USB

Press to select the  USB function.

Remote: FUNCTION

Press to select the function.

 (HCD-GT660/GT440 only)

SUBWOOFER

SUBWOOFER indicator

Lights up when the subwoofer is on.

 PUSH

Press to insert or eject a tape.

ERASE

from the connected optional USB device
(Digital music player or USB storage
media).

Unit: PRESET EQ, GROOVE,

SURROUND

Remote: EQ 

PLAY MODE/TUNING MODE 

(HCD-GT660 only)

Press to select the play mode of a CD,
MP3 disc or an optional USB device
(Digital music player or USB storage
media).
Press to select the tuning mode.

EQ BAND (HCD-GT440/GT220

only)

Press to select the frequency band.

R

PHONES jack

Connect the headphones.

RB

AUDIO INPUT L/R jacks

Connect to an audio component
(Portable audio player, etc.).

RT

 (USB) port

Connect an optional USB device (Digital
music player or USB storage media).

RE

REC/ERASE indicator

Lights up when recording to the
connected optional USB device (Digital
music player or USB storage media), or

RG

MIC jack

Connect an optional microphone.

MIC LEVEL

Turn to adjust the microphone volume.

RH

Unit: MASTER VOLUME

Turn to adjust the volume.

Remote: VOLUME +/

Press to adjust the volume.

RI

OPERATION DIAL

RK

Unit:  (play/pause)

Remote:  (play)

 (pause)

Press to start or pause playback.

 (stop)

Press to stop playback.

/ (go back/go forward)

Unit: TUNING +/

Remote: +/   (tuning)

Press to tune in the desired station.

 +/   (select folder)

Press to select a folder.

/ (rewind/fast forward)

RL

CD-USB SYNC/REC1

Press to record from a disc onto the
connected optional USB device (Digital
music player or USB storage media).

CD-TAPE SYNC

TAPE REC PAUSE/START

Press to record onto a tape.

RM

 OPEN/CLOSE

Press to insert and eject a disc.

X

Unit: DISC 1    3

Press to select a disc. Press to switch to
the CD function from other function.

Unit: DISC SKIP/EX-CHANGE

Press to select a disc. Press to exchange a 
disc while playing.

Remote: DISC SKIP 

Press to select a disc.

XB

RETURN

Press to return to the parent folder.
Press to exit search mode.

XT

ENTER

Press to enter the settings.

XE

 (HCD-GT660 only)

ENTER

Press to enter the settings.

+/   (equalizer level)

Press to adjust the equalizer level.

XG

 (HCD-GT660 only)

BASS

indicator lights up when the button is
pressed.

VOCAL

indicator lights up when the button is
pressed.

GUITAR

indicator lights up when the button is
pressed.

FOCUS

Press to emphasize equalizer level of the
selected band.

XH

CLOCK/TIMER SELECT

CLOCK/TIMER SET

Press to set the clock and the timers.

XI

REPEAT/FM MODE

Press to listen to a disc, an USB device, a 

Press to select the FM reception mode
(monaural or stereo).

XK

Battery compartment lid

XL

CLEAR

Press to delete a pre-programmed track

XM

TUNER MEMORY

Press to preset the radio station.

F

PLAY MODE/TUNING MODE 

Press to select the play mode of a CD,
MP3 disc or an optional USB device
(Digital music player or USB storage
media).
Press to select the tuning mode.

FB

SLEEP

Press to set the Sleep Timer.

•  This set can be disassembled in the order shown below.