DOWNLOAD Sony MEX-BT2500 Service Manual ↓ Size: 4.98 MB | Pages: 48 in PDF or view online for FREE

5

KEY board

front panel

AUX jack

When repairing, the complete BT board (A-1243-387-A) should be
replaced since any parts in the BT board cannot be repaired.

When repairing, the complete SERVO board (A-1177-201-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 front panel.
2. Place the KEY board on the front panel and align the terminals

of the AUX jack with the holes in the KEY board.

3. Solder the three terminals of the jack.

• Set to be tested (MEX-BT2500)

• Cellular phone (Recommended SEMC K320i or K800i, or

select from connectable cellular phones list)

• Speaker connection (at least Front L/R ch)

• DC power supply (12V)

Turn on the Bluetooth function of the cellular phone in advance.
Remove a Bluetooth device connected to the cellular phone in
advance. (at least, remove XPLOD)

• No other Bluetooth device is making a communication in the

periphery. (within 20m)

• No other MEX-BT2500 is supplied with electric power.

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

periphery. (with 50m) (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.

Install the MEX-BT2500 on the desktop.

• There is no fault if a talking can be made by adjusting

appropriately the volume of the telephone of the other party
and the cellular phone connected through the Bluetooth,
besides the setup of MEX-BT2500.

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

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.

1. Press the [BLUETOOTH] button for 7 seconds to check if the

BT logo changes from lighting to blinking.

2. Search peripheral equipment from the cellular phone to check

if “XPLOD” is found.

3. Search peripheral equipment from the cellular phone apart from

the set about 5m to check if “XPLOD” is found.

4. Check if peripheral equipment can be registered to the cellular

phone (pass code 0000).

5. Make a connection to the cellular phone to check if the HF

logo lights up. (This may be conducted at the same time in
item 4)

6. After making a connection to the cellular phone, move the

cellular phone apart from the set about 5m to check if the
connection is held.

7. After switching the source of the MEX-BT2500 to other than

BT PHONE (i.e. TUNER) to check that a sound is generated,
make a call to the cellular phone connected to the set.

8. Check that the sound being played is interrupted and in turn

the ring tone is heard. (the built-in sound of the set will be
generated or the ring tone of cellular phone will be heard
depending on the cellular phone)

9. Press the [PUSH SELECT] button for a short time to check that

the conversation can be made.

Under normal conditions, the battery will last 
approximately 1 year. (The service life may be 
shorter, depending on the conditions of use.)
When the battery becomes weak, the range of the 
card 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
•

Keep the lithium battery out of the reach of children. 
Should the battery be swallowed, immediately 
consult a doctor.

•

Wipe the battery with a dry cloth to assure a good 
contact.

•

Be sure to observe the correct polarity when 
installing the battery.

•

Do not hold the battery with metallic tweezers, 
otherwise a short-circuit may occur.

1

2

c

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

6

10. Check that the other party’s voice can be heard from the

speaker.

11. Check by operating the Volume that the other party’s volume

varies.

12. Speak to the microphone of the set to check that the other

party can hear it. (Make sure that there is no large difference
from normal set)

13. Press the [PUSH SELECT] button for 2 seconds to check that

the HF turns off and the set is switched to a telephone call
between cellular phones. (This may not function depending
on the cellular phone)

14. Press the [PUSH SELECT] button for 2 seconds to check that

the HF turns on and the set is switched to a telephone call
between MEX– BT2500 and far end.

15. Press the [PUSH SELECT] button for a short time to check that

a telephone call is terminated. Also, the original source is
returned.

16. Perform ACC OFF -> ON to check if the set is reconnected

automatically to the cellular phone.

1. Connect the set to the BT audio device (or cellular phone

furnished with BT audio function) to check that the streaming
logo lights up.

2. Play the BT audio device to check that a sound is generated

from the set when the source is switched to the BT audio.

3. Operate the set ([SEEK --- /+], [6] button operation) to check if

it can control the BT Audio.

The functions that can be operated vary depending on the BT audio
device connected.

4. Perform ACC OFF -> ON to check if the set can be reconnected

to the BT audio device. (Some BT audio devices may be
reconnected automatically)

5. With the BT audio source, press the [6] button to check if the

streaming logo blinks and the set is reconnected to the BT
audio device. (This function is disabled while the set is
reconnected to a cellular phone. Accordingly, this test should
be conducted after the power is turned on and then the HF
logo lights up, or when about 30 seconds elapsed after the
power on)

This should be performed when the set is sent back to the user after
all the checks finished successfully.

1. Execute the initialization.
2. Press the [BLUETOOTH] button for 3 seconds to check if the

BT logo lights up.

3. Check that the set is not connected automatically to the cellular

phone that was connected last.

4. With the BT audio source, check that the streaming logo does

not blink when the [6] button is pressed.

1. If the board does not need to be replaced

•

Return the bluetooth settings to original ones. (settings when

the set was received from the user)

2. If the board needs to be replaced

•

Return to the factory shipping mode.

7

This section is extracted from
instruction manual.

Refer to the pages listed for details. 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

CD/Radio/Bluetooth audio:
To select an equalizer type (XPLOD, 
NATURAL, HARD, UPBEAT, VOCAL, 
CUSTOM or OFF).
Power off:
For Bluetooth signal on/off, pairing.

C

To adjust volume (rotate); select setup items 
(press and rotate); receive/end a call (press).

D

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

1 2

qg qh

qf

4

5

8

6

7

3

MEX-BT2500

9

qd

qs

qa

q;

qk

qj

4

ws

qs

1

qh

ql

qd

wa

w;

wf

wd

E

To insert the disc (label side up). Playback  
starts automatically.

F

G

To connect a portable audio device.

H Z 

To eject the disc.

I

J

To start the BTM function (press and hold).

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).
Bluetooth audio device*

1

:

To skip tracks (press).

L

To select the radio band (FM/AM).

M

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

N

CD:
(1)

(2):

*

2

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

(3):

(4):

(6):

*

3

To pause playback. To cancel, press 
again.

Radio:
To receive stored stations (press); store 
stations (press and hold).
Bluetooth audio device*

1

:

(6):

To pause playback. To cancel, press 
again.

O

To scroll the display item.

P

Q

(located behind the front 

panel)

  

R

Note
Do not cover the microphone, the handsfree 
function may not work properly.

The following buttons on the card remote 
commander have also different buttons/functions 
from the unit. Remove the insulation film before 
use.

ql <

.

,

>

The same as (SEEK) –/+ on the unit.

w;

To adjust volume.

wa

To attenuate the sound. To cancel, press 
again.

ws

The same as the select button on the unit.

wd M

m

To control CD, the same as (1)/(2)
(ALBM –/+) on the unit.

wf

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

*1

When a Bluetooth audio device (supports AVRCP 
of Bluetooth technology) is connected. Depending 
on the device, certain operations may not be 
available.

*2

When an MP3/WMA is played.

*3

When playing back on this unit.

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.

Tip
For details on how to replace the battery, see 
“Replacing the lithium battery of the card remote 
commander”.

8

Refer to the  pages listed for de tails. The 
correspond ing buttons on the card remote 
commande r contr ol the same func tions as those 
on the unit.

A

To power off; stop the source.

B

CD/Radio/Bluetooth audio:
To select an equalizer type (XPLOD, 
NATURAL, HARD, UPBEAT, VOCAL, 
CUSTOM or OFF).
Power off:
For Bluetooth signa l on/of f, pairing.

C

(handsfree) button  

To adjust volume (rotate); select setup items 
(press and  rotate); receive/end a call (press).

D

To power on; change the source (Radio/CD/
AUX/Bluetooth aud io/Blueto oth ph one ).

1

9

2

qg qh

qf

4

5

8

6

7

3

MEX-BT2500

qd

qs

qa

q;

qk

qj

4

ws

qs

1

wf

ql

qd

wa

w;

wg

wd

E

To insert the disc (label side up).  Playback 
starts autom atically.

F

G

To connect a portable audio device.

H Z 

To eject the disc.

I

J

To select PTY in RDS.

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).
Bluetooth audio device*

1

:

To skip tracks (press).

L

To select the radio band (FM/MW/LW).

M

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

N

CD:
(1)/(2):

*

2

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

(3):

(4):

(6):

*

3

To pause playback. To cancel, press 
again.

Radio:
To receive stored stations (press); store 
stations (press and hold).
Bluetooth audio device*

1

:

(6):

To pause playback. To cancel, press 
again.

O

To set AF and TA in  RDS.

P

Q

(located behind the front 

panel)

  

R

Note
Do not cover the microphone, the handsfree 
function may not work properly.

The following buttons on the card remote 
commander have also different buttons/functions 
from the unit. Remove the insulation film before 
use.

ql <

.

,

>

The same as (SEEK) –/+ on the unit.

w;

To adjust volume.

wa

To attenuate the sound. To cancel, press 
again.

ws

The same as the select button on the uni t.

wd M

m

To contr ol CD, the same as (1)/(2)
(ALBM –/+) on the uni t.

wf

To scroll the display item.

wg

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

*1

When a Bluetooth audio device (supports AVRCP 
of Bluetooth technology) is connected. Depending 
on the device, certain operations may not be 
available.

*2

When an MP3/WMA is played.

*3

When playing back on this unit.

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.

Tip
For details on how to replace the battery, see 
“Replacing the lithium battery of the card remote 
commander”.