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2014A33-1

© 

2014.01

•  This model is not equipped with a mechanism deck.

FM1/FM2: 87.5 – 108.0 MHz 

(at 50 kHz step)

FM3: 65 – 74 MHz (at 30kHz step)

Antenna (aerial) terminal: 

Tuning range: 

External antenna (aerial) connector

Intermediate frequency: 25 kHz

Usable sensitivity: 8 dBf

Selectivity: 75 dB at 400 kHz

Signal-to-noise ratio: 80 dB (stereo)

Separation: 50 dB at 1 kHz

Frequency response: 20 – 15,000 Hz

Tuning range:

MW: 531 – 1,602 kHz
LW: 153 – 279 kHz

Antenna (aerial) terminal: 

External antenna (aerial) connector

Intermediate frequency: 

Sensitivity: MW: 26 μV, LW: 45 μV  

9,124.5 kHz or 9,115.5 kHz/4.5 kHz

Sensitivity: 26 μV

Tuning range: 87.5 – 108.0 MHz

Antenna (aerial) terminal: 

External antenna (aerial) connector

Intermediate frequency: 25 kHz

Usable sensitivity: 8 dBf

Selectivity: 75 dB at 400 kHz

Signal-to-noise ratio: 80 dB (stereo)

Separation: 50 dB at 1 kHz

Frequency response: 20 – 15,000 Hz

Tuning range: 531 – 1,602 kHz

Antenna (aerial) terminal: 

External antenna (aerial) connector

Intermediate frequency: 

9,124.5 kHz or 9,115.5 kHz/4.5 kHz

Sensitivity: 26 μV

Tuning range:

SW1: 2,940 – 7,735 kHz
SW2: 9,500 – 18,135 kHz
(except for 10,140 – 11,575 kHz)

Antenna (aerial) terminal:

External antenna (aerial) connector

Intermediate frequency:

9,124.5 kHz or 9,115.5 kHz/4.5 kHz

Interface: USB (Full-speed)

Maximum current: 1 A

The maximum number of recognizable data:

Folders (albums): 128
Files (tracks) per folder: 512

Corresponding codec: 

MP3 (.mp3) and WMA (.wma)

Tuning range: 

For non-Argentine models: 
87.5 – 108.0 MHz (at 50 kHz step)
87.5 – 108.0 MHz (at 100 kHz step)
87.5 – 107.9 MHz (at 200 kHz step)
For Argentine models: 
87.5 – 107.9 MHz

FM tuning step (for non-Argentine models): 

50 kHz/100 kHz/200 kHz switchable

Antenna (aerial) terminal: 

External antenna (aerial) connector

Intermediate frequency: 25 kHz

Usable sensitivity: 8 dBf

Selectivity: 75 dB at 400 kHz

Signal-to-noise ratio: 80 dB (stereo)

Separation: 50 dB at 1 kHz

Frequency response: 20 – 15,000 Hz

Tuning range: 

For non-Argentine models: 
531 – 1,602 kHz (at 9 kHz step)
530 – 1,710 kHz (at 10 kHz step)
For Argentine models: 
530 – 1,710 kHz

AM tuning step (for non-Argentine models): 

9 kHz/10 kHz switchable

Antenna (aerial) terminal: 

External antenna (aerial) connector

Intermediate frequency: 

For non-Argentine models: 
9,124.5 kHz or 9,115.5 kHz/4.5 kHz (at 9 kHz 
step)
9,115 kHz or 9,125 kHz/5 kHz (at 10 kHz step)
For Argentine models: 
9,115 kHz or 9,125 kHz/5 kHz

Sensitivity: 26 μV

Photo: DSX-A55BT

– Continued on next page –

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

3

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

6

3-1. Disassembly 

Flow 

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

3-2.  Fuse (Blade Type) (Auto Fuse) (10A/32V) (FU101), 

Cover ...............................................................................   14

3-3.  Sub Panel Block ..............................................................   15
3-4.  MAIN Board (with BT Board) .......................................   16
3-5. Antenna 

BT 

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

 ............................................................   17

5-1.  Block Diagram - MAIN Section - ...................................   19
5-2. Block 

Diagram 

- DISPLAY/POWER SUPPLY Section - ........................   20

5-3.  Printed Wiring Board - MAIN Section (1/2) - ................   22
5-4.  Printed Wiring Boards - MAIN Section (2/2) - ..............   23
5-5.  Schematic Diagram - MAIN Section (1/3) - ...................   24
5-6.  Schematic Diagram - MAIN Section (2/3) - ...................   25
5-7.  Schematic Diagram - MAIN Section (3/3) - ...................   26

 .................................................   33

 ..............................   34

Accessories are given in the last of the electrical parts list.

NOTES  ON  CHIP  COMPONENT  REPLACEMENT
• 

Never reuse a disconnected chip component.

• 

Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.

The Bluetooth® word mark and logos are owned 
by the Bluetooth SIG, Inc. and any use of such 
marks by Sony Corporation is under license. 
Other trademarks and trade names are those of 
their respective owners.

Windows Media is either a registered trademark 
or trademark of Microsoft Corporation in the 
United States and/or other countries.

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.

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

Android is a trademark of Google Inc. Use of this 
trademark is subject to Google Permissions.

AVRCP (Audio Video Remote Control Profile) 
1.3
HFP (Handsfree Profile) 1.5
PBAP (Phone Book Access Profile)

*1 The actual range will vary depending on factors 

such as obstacles between devices, magnetic 
fields around a microwave oven, static 
electricity, reception sensitivity, antenna 
(aerial)’s performance, operating system, 
software application, etc.

*2 BLUETOOTH standard profiles indicate the 

purpose of BLUETOOTH communication 
between devices.

Output: Speaker outputs

Speaker impedance: 4 – 8 ohms

Maximum power output: 55 W × 4 (at 4 ohms)

Outputs: 

E, Saudi Arabia, Mexican and Indian models: 
Audio outputs terminal (front, rear)
Power antenna (aerial)/Power amplifier 
control terminal (REM OUT)

Argentina and Russian models:
Audio outputs terminal (front, rear)
Power antenna (aerial) relay control terminal
Power amplifier control terminal

Inputs: 

Remote controller input terminal
Antenna (aerial) input terminal
AUX input jack (stereo mini jack)
USB port

Power requirements: 12 V DC car battery 

(negative ground (earth))

Dimensions: 

Approx. 178 mm × 50 mm × 120 mm 
(7 

1

/

8

 in × 2 in × 4 

7

/

8

 in) (w/h/d)

Mounting dimensions: 

Approx. 182 mm × 53 mm × 103 mm 
(7 

1

/

4

 in × 2 

1

/

8

 in × 4 

1

/

8

 in) (w/h/d)

Mass: Approx. 0.7 kg (1 lb 9 oz)

Package contents:

Remote commander (1): RM-X231
Parts for installation and connections (1 set)

Design and specifications are subject to 
change without notice.

Communication System: 

BLUETOOTH Standard version 2.1 + EDR

Output: 

BLUETOOTH Standard Power Class 2 
(Max. +4 dBm)

Maximum communication range: 

Line of sight approx. 10 m (33 ft)*

1

Frequency band: 

2.4 GHz band (2.4000 – 2.4835 GHz)

Modulation method: FHSS

Compatible BLUETOOTH Profiles*

2

:

A2DP (Advanced Audio Distribution Profile) 
1.2

Maintenance

Replacing the lithium battery of the 
remote commander
When the battery becomes weak, the range 
of the remote commander becomes shorter. 
Replace the battery with a new CR2025 
lithium battery. Use of any other battery may 
present a risk of fire or explosion.

Notes on the lithium battery

ˎ Keep the lithium battery out of the reach of 

children. Should the battery be swallowed, 
immediately consult a doctor.

ˎ Wipe the battery with a dry cloth to assure a good 

contact.

ˎ Be sure to observe the correct polarity when 

installing the battery.

ˎ Do not hold the battery with metallic tweezers, 

otherwise a short-circuit may occur.

Cleaning the connectors
The unit may not function properly if the 
connectors between the unit and the front 
panel are not clean. In order to prevent this, 
detach the front panel (page 7) and clean the 
connectors with a cotton swab. Do not apply 
too much force. Otherwise, the connectors 
may be damaged.

WARNING
Battery may explode if mistreated.
Do not recharge, disassemble, or dispose 
of in fire.

+ side up

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.

ABOUT  CHECKING  THE  OPERATION
When checking the operation of this unit, connect a USB device 
to this unit.
Refer to the support site written in the operating instruction for the 
details about the compatibility of a USB device.

NOTE  OF  REPLACING  THE  KEY  BOARD
When the KEY board is defective, exchange the FRONT PANEL 
ASSY (Ref. No. FP1).

NOTE  OF  REPLACING  THE  BT  BOARD
When the BT board is defective, exchange the complete mounted 
board.

NOTE  OF  REPLACING  THE  IC603  ON  THE  MAIN  BOARD
IC603 on the MAIN board cannot exchange with single. When this 
part is damaged, exchange the complete mounted board.

IMPORTANT  NOTE  OF  “INITIALIZING”
The purpose of “Bluetooth Initialize” is to initialize the Bluetooth 
connection history (HF/Audio Streaming). (To delete the device 
information for the devices that you connected to when searching, 
etc.)
When the BT board or MAIN board (including BT board) are re-
placed, it is necessary to initialize this unit.
Refer to the following, initialize this unit.

Note: Phonebook data and dialed/received call history can be deleted by 

executing “Bluetooth Initialize.”

Procedure:
1.  In the state of source off (the clock is displayed), press and 

hold the [PUSH ENTER/SELECT/ ] button.

2.  Rotate the control dial, and select the “BT INIT”.
3.  Press the [PUSH ENTER/SELECT/ ] button, and the mes-

sage “INIT-NO” is displayed on the liquid crystal display.

4.  Rotate the control dial clockwise, and the message “INIT-

YES” is displayed on the liquid crystal display.

5.  Press the [PUSH ENTER/SELECT/ ] button, and the mes-

sage “INITIAL” is blinked on the liquid crystal display.

6. When “Bluetooth Initialize” is completed, the message 

“COMPLETE” is displayed on the liquid crystal display for a 
moment.

7.  Press the [

/MODE] button, and return to the state of source 

off (the clock is displayed) mode.

Notes

ˎ For safety, turn off the ignition before cleaning 

the connectors, and remove the key from the 
ignition switch.

ˎ Never touch the connectors directly with your 

fingers or with any metal device.

Canceling the DEMO Mode

You can cancel the demonstration display 
which appears while this unit is turned off.

1

Press and hold SELECT.

The setup display appears.

2

Rotate the control dial to select 
[DEMO], then press it.

3

Rotate the control dial to select 
[DEMO-OFF], then press it.

The setting is complete.

4

Press  

(back).

The display returns to normal reception/
play mode.

 and clean the 

NOTE  OF  REPLACING  THE  COMPLETE  MAIN  BOARD  
OR  SYSTEM  CONTROLLER (IC101)
When the complete MAIN board or system controller (IC101) is 
replaced, the destination setting is necessary.

Set destination according to the procedure below.

1-1.  Setting the Destination Code
1.  In the state of source off (the clock is displayed), enter the 

test mode by pressing the buttons on the remote commander in 
order of the [4] 

t [5] t [6] (press only the [6] button for two 

seconds).

2.  In the state in which the system controller version is displayed 

on the liquid crystal display (refer to following fi gure), enter 
the destination setting mode by pressing the buttons on the 
main unit in order of the [SEEK+ 

M >

] 

t [SEEK–

  .

 

m

] 

t [PUSH ENTER/SELECT/ ].

 

(Displayed characters/values in the following fi gure are ex-
ample)

SHUF

3.  Input the alphanumeric character of 8 digits of “F   XXXXXX” 

displayed on the liquid crystal display, and execute the destina-
tion setting.

Note: Refer to following “1-3. Entering the Destination Code” for opera-

tion method.

4.  The resetting operation is executed by pressing the [SOURCE

 

OFF] button for 1 second after the setting ends, and the unit 

returns to the normal condition.

SHUF

1.  Rotate the control dial, and select the alphanumeric character 

of “0 to F”.

2.  The digit advances by pressing the [PUSH ENTER/SELECT/

] or [SEEK+ 

M >

] button.

 

The digit returns by pressing the [ /MODE] or [SEEK–

 .

 

m

] button.

3.  The setting is completed by pressing the [PUSH ENTER/SE-

LECT/ ] button, and the initialization operation is done.

1. Press 

the 

[V] or [v] button, and select the alphanumeric char-

acter of “0 to F”.

2.  The digit advances by pressing the [b] button.
 

The digit returns by pressing the [B] button.

3.  The setting is completed by pressing the [ENTER] button, and 

the initialization operation is done.

DSX-A55BT

E, Mexican, 
Indian

0

0

4

A

0

0

Saudi Arabia

0

0

4

A

0

4

Argentina

0

0

4

A

0

3

DSX-A55BTE

Russian

0

0

6

2

0

7

2. Confi rmation After Destination Setting
Execute the following operation after completing the destination 
setting, and confi rm a correct destination was set.

Destination setting checking method:
1.  In the state of source off (the clock is displayed on the liquid 

crystal display), enter the test mode by pressing the buttons on 
the remote commander in order of the [4] 

t [5] t [6] (press 

only the [6] button for two seconds).

2.  In the state in which the system controller version is displayed 

on the liquid crystal display (refer to following fi gure), enter 
the destination setting value display mode by pressing the [

 

SCRL DSPL] button on the main unit three times.

 

(Displayed characters/values in the following fi gure are ex-
ample)

SHUF

3. Confi rm the alphanumeric character of 8 digits of in liquid 

crystal display is an value correctly input.

 

(Displayed characters/values in the following fi gure are ex-
ample)

4.  The resetting operation is executed by pressing the [SOURCE

 

OFF] button on the main unit for 1 second after the confi rm-

ing ends, and the unit returns to the normal condition.