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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 breakdown 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.

If the optical pick-up block is defective, please replace the whole
optical pick-up block.
Never turn the semi-fixed resistor located at the side of optical pick-
up block.

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

Output

Audio outputs terminal
(sub/rear switchable)
Power antenna (aerial) relay control terminal
Power amplifier control terminal

Inputs

Antenna (aerial) input terminal
AUX input jack (stereo mini jack)

Power requirements

12 V DC car battery (negative ground (earth))

Power supply voltage

11 V – 16 V

Dimensions

Approx. 178 mm 

×

 50 mm 

×

 179 mm

(7

 1/8

 in. 

×

 2 in. 

×

 7

 1/8

 in.) (w/h/d)

Mounting dimensions

Approx. 182 mm 

×

 53 mm 

×

 162 mm

(7

 1/4

 in. 

×

 2

 1/8

 in. 

×

 6

 1/2

 in.) (w/h/d)

Mass

Approx. 1.2 kg (2 lb. 11 oz.)

Supplied accessories

Parts for installation and connections (1 set)
Card remote commander: RM-X151
(CDX-GT27 only)

MPEG Layer-3 audio coding technology and
patents licensed from Fraunhofer IIS and Thomson.

This product is protected by certain intellectual
property rights of Microsoft Corporation. Use or
distribution of such technology outside of this
product is prohibited without a license from
Microsoft or an authorized Microsoft subsidiary.

optical pick-up

semi-fixed resistor

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

by heat.

Please use the following test discs for the check on the CD section.

YDES-18 (Part No. 3-702-101-01)
PATD-012 (Part No. 4-225-203-01)

3

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 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.

You can play CD-DA (also containing CD TEXT) and CD-R/
CD-RW (MP3/WMA files*).

Type of discs

Label on the disc

CD-DA

MP3

*

WMA

*

* CDX-GT27 only

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

4

Location of Controls ........................................................

5

Connections .....................................................................

5

3-1.

Sub Panel Assy ................................................................

8

3-2.

CD Mechanism Block .....................................................

8

3-3.

Main Board ......................................................................

9

3-4.

Servo Board .....................................................................

9

3-5.

Chassis (T) Sub Assy ....................................................... 10

3-6.

Roller Arm Assy .............................................................. 10

3-7.

Chassis (OP) Assy ........................................................... 11

3-8.

Chucking Arm Sub Assy ................................................. 11

3-9.

Sled Motor Assy .............................................................. 12

3-10. Optical Pick-up Section ................................................... 13
3-11. Optical Pick-up ................................................................ 13

........................................ 14

5-1.

Block Diagram –Main Section– ...................................... 17

5-2.

Block Diagram –Display Section– .................................. 18

5-3.

Printed Wiring Board –Main Section– ............................ 19

5-4.

Schematic Diagram –Main Section (1/4)– ...................... 20

5-5.

Schematic Diagram –Main Section (2/4)– ...................... 21

5-6.

Schematic Diagram –Main Section (3/4)– ...................... 22

5-7.

Schematic Diagram –Main Section (4/4)– ...................... 23

5-8.

Printed Wiring Board –Key Section– .............................. 24

5-9.

Schematic Diagram –Key Section– ................................. 25

6-1.

Main Section .................................................................... 29

6-2.

Front Panel Section ......................................................... 30

6-3.

CD Mechanism Section (MG-101TC-188//C) ................ 31

.................................. 32

This compact disc player is classified as a CLASS 1 LASER
product. The CLASS 1 LASER PRODUCT label is located on the
exterior.

4

SERVO BOARD
CN2

MAIN BOARD
CNP301

J-2502-076-1

When repairing or servicing this set, connect the jig (extension cable)
as shown below.

• Connect the MAIN board (CNP301) and the SERVO board (CN2)

with the extension cable (Part No. J-2502-076-1).

When repairing, the complete SERVO board (A-1201-631-A) should
be replaced since any parts in the SERVO board cannot be repaired.

To replace the AUX jack requires alignment.
1. Insert the AUX jack into the KEY board.
2. Place the KEY board on the front panel.
3. Solder the three terminals of the jack.

KEY board

front panel

AUX jack

5

This section is extracted
from instruction manual.

This section contains instructions on the location 
of controls and basic operations.
For details, see the respective pages.
The corresponding buttons on the card remote 
commander control the same functions as those 
on the unit.

A

To power off; stop the source.

B

EQ3 (equalizer) button  page 9

To select an equalizer type (XPLOD, 
VOCAL, EDGE, CRUISE, SPACE, 
GRAVITY, CUSTOM or OFF).

C

Volume control dial/select button  
page 9

To adjust volume (rotate); select setup items 
(press and rotate).

D

To power on; change the source (Radio/CD/
AUX).

E

Insert the disc (label side up), playback 
starts.

F

G

AUX input jack  page 10

To connect a portable audio device.

H Z 

To eject the disc.

I

 (front panel release) button  page 5

1

qa qs

q;

9

2

qd

qh

qg

4

5

8

6

7

3

qf

4

wa

qs

1

wd

qj

qk

w;

ql

wf

ws

J

DSPL (display)/SCRL (scroll) button 
(CDX-GT27) page 8

To change display items (press); scroll the 
display item (press and hold).

  

page 8

To change display items.

K

CD:
To skip tracks (press); skip tracks 
continuously (press, then press again within 
about 1 second and hold); reverse/fast-
forward a track (press and hold).
Radio:
To tune in stations automatically (press); find 
a station manually (press and hold).

L

MODE button  page 8

To select the radio band (FM/MW/SW).

M

BTM button  page 8

To start the BTM function (press and hold).

N

 (located on the 

bottom of the unit)
See “Frequency select switch” in the 
supplied installation/connections manual.

O

CD:
(1)/(2)

: ALBUM –/+ 

(during MP3/WMA 

playback) (CDX-GT27)

To skip albums (press); skip albums 
continuously (press and hold).

(3): 

REP  page 8

(4): 

SHUF  page 8

(6): 

To pause playback of a CD on this unit. 
To cancel, press again.

Radio:
To receive stored stations (press); store 
stations (press and hold).

P

The following buttons on the card remote 
commander have also different buttons/functions 
from the unit. Remove the insulation film before 
use (page 5). (CDX-GT27 only)

qj <

.

,

>

To control CD/radio, the same as (SEEK) 
–/+ on the unit.
Setup, sound setting, etc., can be operated by 
< ,.

qk

To change display items.

ql

To adjust volume.

w;

To attenuate the sound. To cancel, press 
again.

wa

The same as the select button on the unit.

ws M

m

To control CD, the same as (1)/(2) 
(ALBUM –/+) on the unit.
Setup, sound setting, etc., can be operated by 
M m.

wd

To scroll the display item.

wf

To receive stored stations (press); store 
stations (press and hold).

Note
If the unit is turned off and the display disappears, it 
cannot be operated with the card remote commander 
unless 

(SOURCE)

 on the unit is pressed, or a disc is 

inserted to activate the unit first.

*

 AUDIO OUT SUB/REAR

*

 AUDIO OUT SUB/REAR

2

•

Be sure to connect the ground (earth) lead before connecting 
the amplifier.

•

The alarm will only sound if the built-in amplifier is used.