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NOTE  FOR  REPLACEMENT  OF  THE  USB  CONNEC-
TOR (CN971)  AND  THE  AUX  JACK (J901)
To replace the USB connector and the AUX jack requires align-
ment.
1.  Insert the USB connector and the AUX jack into the front pan-

el.

2.  Place the KEY board on the front panel and align the terminals 

of the USB connector and the AUX jack with the holes in the 
KEY board.

3.  Solder seven terminals of the connector and three terminals of 

the jack.

TEST  DISCS
Use following TEST DISC when this set confi rms the operation 
and checks it.

Part No.

   

Description

3-702-101-01 

DISC (YEDS-18), TEST (for CD)

4-225-203-01 

DISC (PATD-012), TEST (for CD)

NOTE  FOR  REPLACEMENT  OF  THE  BT  BOARD
When repairing, the complete BT board should be replaced since 
any parts in the BT board cannot be repaired.

NOTE  FOR  REPLACEMENT  OF  THE  SERVO  BOARD
When repairing, the complete SERVO board should be replaced 
since any parts in the SERVO board cannot be repaired.

NOTE  FOR  REPLACEMENT  OF  THE  SENSOR  BOARD
When the SENSOR board is defective, exchange the MECHANI-
CAL BLOCK (U) ASSY 08 (Former type) or MECHANICAL 
BLOCK (11CA) ASSY (New type).

Note: As for the mechanism deck (MG-101CA-188) carried in this 

unit, component parts have been changed from the midway 
of production. When you perform repair exchange of the 
mechanism deck (MG-101CA-188), refer to “ABOUT THE 
MG-101CA-188 OF FORMER AND NEW” on page 8.

EXTENSION  CABLE  AND  SERVICE  POSITION
When repairing or servicing this set, connect the jig cable (exten-
sion cable (CD mecha)) as shown below.

•  Connect the MAIN board (CN700) and the SERVO board 

(CN401) with the jig cable.

Jig cable:
Part No.

   

Description

A-1818-424-A 

EXTENSION CABLE (CD MECHA)

4-300-009-0[]

BT4000P: US and Canadian models

4-300-010-0[]

BT4000E: Russian model

4-300-011-0[]

BT4050U: E model

4-300-012-0[]

BT4050U: Mexican model

4-300-013-0[]

BT4050U: Saudi Arabia model

4-300-014-0[]

BT4000U: AEP and UK models

4-300-015-0[]

BT4054U: Indian model

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 set.
Refer to the following, initialize this set.

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

executing “Reset.”

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
t Keep the lithium battery out of the reach of 

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

t Wipe the battery with a dry cloth to assure a 

good contact.

t Be sure to observe the correct polarity when 

installing the battery.

t Do not hold the battery with metallic tweezers, 

otherwise a short-circuit may occur.

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

of in fire.

You can initialize all the Bluetooth related 
settings (pairing information, phonebook, 
call history, preset number, device 
information, etc.) from this unit.

Press and hold the select button.
The menu list appears.

Rotate the control dial to select “BT 
INIT,” then press it.
The confirmation appears.

Rotate the control dial to select “INIT-
YES,” then press it.
“INITIAL” flashes while initializing the 
Bluetooth settings; “COMPLETE” 
appears when initializing has finished.

When disposing of this unit, preset numbers 
should be deleted with “BT INIT.”

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

Press and hold the select button.
The setup display appears.

Rotate the control dial to select 
“DEMO-OFF,” then press it.
The setting is complete.

The display returns to normal reception/
play mode.

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 and clean the 
connectors with a cotton swab. Do not apply too much force. 
Otherwise, the connectors may be damaged. 

t For safety, turn off the ignition before cleaning the connectors, 
  and remove the key from the ignition switch.
t Never touch the connectors directly with your fingers or with 
  any metal device.

Note: Depending on the connecting device, Signal-strength/Battery-re-

maining indications might not be displayed.

 

  Or, depending on the connecting device, the levels of indications are 

shown incorrectly.

 

  Even if you see no indications or wrong indications, they are not fail-

ures of MEX-BT4000E/BT4000P/BT4000U/BT4050U/BT4054U.

1.  Search for this set from the Bluetooth device (cellular phone), 

and confi rm whether this set (“Sony Automotive”) is dis-
played.

2.  Search for the distance of this set and the Bluetooth device 

(cellular phone) about 5 m apart.

 Confi rm whether the Bluetooth device (or this set) is displayed 

after it searches.

3.  Do the pairing of the cellular phone and this set (input of pass 

code).

4.  Connect the cellular phone with this set, and confi rm the “HF” 

icon lights.

5. Confi rm the connection continues even if the distance of the 

cellular phone and this set is separated by about 5 m.

6.  Set this set besides the “BT PHONE” source, and call the cel-

lular phone connected with this set.

 Confi rm the automatic change of this set into “BT PHONE” 

source, and the change into the screen for incoming calls.

 Confi rm the ring tone is heard from the speaker.
7.  Take a phone call (press the encoder switch), and start a con-

versation.

 Confi rm the other person voice is heard from the speaker.
 

Speak toward the microphone of this set, and confi rm whether 
the other party hears its voice (At the external microphone 
noncontact).

 

Compare the sound quality with a normal set. Confi rm  that 
there is no big difference.

8.  Speak toward an external microphone at the following condi-

tion, and confi rm the other party hears its voice.

• 

An external microphone is connected.

9.  Turn on ACC from off, and confi rm whether this set connects 

Bluetooth with the cellular phone again.

Note: Depending on the cellular phone, it might not reconnect automati-

cally when ACC is turned on.

Note: Depending on the connecting BT Audio device, track information 

(e.g. track name, playback time) can be on display.

 

If the device doesn’t support AVRCP1.3, or, if AVRCP1.3 feature of 
the device has not been validated with MEX-BT4000E/BT4000P/
BT4000U/BT4050U/BT4054U;   

 

the track information won't be shown.

 

Even if there is no track information on display during playback 
of an AVRCP1.3 device, it is not a failure of MEX-BT4000E/
BT4000P/BT4000U/BT4050U/BT4054U.

1.  Connect the Bluetooth audio device (or cellular phone with 

Bluetooth audio function) with this set, and confi rm the “Au-
dio Streaming” icon lights.

2.  Playback Bluetooth audio. Confi rm the sound is emitted from 

this set when this set is switched to “Bluetooth Audio” source.

3. Confi rm whether Bluetooth audio can be controlled by operat-

ing this set (the Multi way encoder left/right, [PAUSE] keys 
operation).

Note: Varies depending on the connected Bluetooth audio device.

8.  What to Do after Checking
• 

After checking, select “BT INIT” from the menu list of this set 
to execute initialization.

 

(Connected device information is deleted.)

• 

Set to be tested (MEX-BT4000E/BT4000P/BT4000U/BT4050U/
BT4054U), external microphone of attachment if necessary

• 

Cellular phone (Recommended SEMC W880 or W910i, or se-
lect from connectable cellular phones list)

•  Bluetooth audio devices (SONY NWZ-A826, or select from 

connectable cellular phones/audio devices list)

• 

Speaker connection (at least Front L/R ch)

• 

DC power supply (12 V)

2. Preparation
• Confi rm the setting of the MEX-BT4000E/BT4000P/BT4000U/

BT4050U/BT4054U, and notate it.

• 

Press the [CALL] button and rotate the control dial until “SET 
PAIRING” appears, then press it, confi rm that the Bluetooth 
signal icon (

) is fl ashing.

• 

Turn on the Bluetooth function of the cellular phone.

• 

No other Bluetooth device is making a communication in the 
periphery (within 20 m).

•  No other MEX-BT4000E/BT4000P/BT4000U/BT4050U/BT4054U 

are supplied with electric power.

•  There are no two or more wireless LAN access points in the 

periphery (with 50 m) (one is OK).

• 

The set should be tested in a place such as a meeting room, free 
from ambient noise.

• 

The speaker at the far end should be in a place such as another 
meeting room separated acoustically.

4. Setting
Install the MEX-BT4000E/BT4000P/BT4000U/BT4050U/BT4054U 
on the desktop.

5. Precautions
Beware of the following points when conducting the 
talking test:
•  There is no fault if a talking can be made by adjusting ap-

propriately the volume of the telephone of the other party and 
the cellular phone connected through the Bluetooth, besides 
the setup of MEX-BT4000E/BT4000P/BT4000U/BT4050U/
BT4054U.

• 

The speaker’s voice will become loud naturally if the periph-
ery is noisy, or become low if quiet (even though the speaker 
intents to talk on the same volume level).

•  The speaker’s voice will become loud naturally if the other 

party’s voice is loud.

ABOUT  THE  MG-101CA-188  OF  FORMER  AND  NEW
As for the mechanism deck (MG-101CA-188) carried in this unit, component parts have been changed from the midway of production. 
When you perform repair exchange of the mechanism deck (MG-101CA-188), please be sure to work, after referring to the following fi gure 
and checking former and new.

 

As shown in the following fi gure, please check the SERVO board side of the mechanism deck (MG-101CA-188).

 

 

 

New type

+

New type

=

OK

New type

+

Former type

=

OK

Former type

+

New type

=

NG

Former type

+

Former type

=

OK