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SRS-BTV25

VERSION  DISPLAY  MODE
This mode can display the soft version and bluetooth module ver-
sion.

Procedure:
1.  Press the [

?/1

] key to turn the power on.

2.  Press three keys of the [BOOST], [BLUETOOTH] and [VOL 

–] simultaneously, then press the key in order of [BOOST] → 
[BLUETOOTH] → [VOL –] within three seconds.

3.  [POWER] LED blinks (cycle of the 500 millisecond), and en-

ter the version display mode.

4.  Press the [BOOST] key to enter the soft version display mode. 

Because LED blinks in order of [BOOST] (major version) → 
[POWER] (fi rst digit of minor version) → [ ] (second digit of 
minor version), a soft version is shown. It returns to the state 
of step 3 after the version is displayed.

 

Example  : When the soft version is “1.23”

 

[BOOST]  LED blinks 1 time (cycle of the 1 second)

 

[POWER]  LED blinks 2 times (cycle of the 1 second)

 

[ ] 

LED blinks 3 times (cycle of the 1 second)

5.  Press the [BLUETOOTH] key to enter the bluetooth mod-

ule version display mode. Because LED blinks in order of 
[BOOST] (major version) → [POWER] (fi rst digit of minor 
version)  →  [ ] (second digit of minor version), a bluetooth 
module version is shown. It returns to the state of step 3 after 
the version is displayed.

 

Example  : When the bluetooth module version is “4.50”

 

[BOOST]  LED blinks 4 times (cycle of the 1 second)

 

[POWER]  LED blinks 5 times (cycle of the 1 second)

 

[ ] 

LED doesn’t blink

Releasing method:
Press the [

?/1

] key to return the power off, or press three keys of 

the [BOOST], [BLUETOOTH] and [VOL –] simultaneously, then 
press the key in order of [BOOST] → [BLUETOOTH] → [VOL 
–] within three seconds.

RESET  MODE (FOR  USER)
This mode can initialize the microprocessor.
(The contents reset are the same as that of “RESET MODE (FOR 
MAKER)”)

Procedure:
1.  Press the [

?/1

] key to turn the power on.

2.  Press two keys of the [BOOST] and [BLUETOOTH] simulta-

neously for more than fi ve seconds.

3.  The [POWER] LED blinks for two seconds, and the initializa-

tion of microprocessor is executed.

RESET  MODE (FOR  MAKER)
This mode can initialize the microprocessor.
(The contents reset are the same as that of “RESET MODE (FOR 
USER)”)

Procedure:
1.  Press the [

?/1

] key to turn the power on.

2.  Press three keys of the [BOOST], [BLUETOOTH] and [VOL 

+] simultaneously, then press the key in order of [BOOST], 
[BLUETOOTH] and [VOL +] within three seconds.

3.  The [POWER] LED blinks for more than two seconds, and the 

initialization of microprocessor is executed.

Note 1: When replacing MAIN board, please also exchange LOUDSPEAKER (5.6 cm) (WOOFER) (SP1) and LOUDSPEAKER (20 mm) (TWEETER) 

(SP2) simultaneously.

5

6 battery connector

7 MAIN board

1 connector

2 connector

3 connector

4 three screws

u 6)

Note 2: Arrange the wire under the board.

SRS-BTV25

83 LED PWR

SYSTEM CONTROLLER

IC101

LED DRIVE

Q601

D601

84 LED BT

LED DRIVE

Q603

D603

85 LED BASS

LED DRIVE

Q604

D604

BOOST

POWER

86 LED AUDIO

LED DRIVE

Q605

D605

AUDIO IN

90 KEY_1 (PWR/VOL+-)

73 KEY_PWR

91 KEY_2 (BT)
92 KEY_3 (BASS/PLAY)

33 BT_TXD
34 BT_RXD
36 BT_RTS
32 BT_CTS
18 BT_MUTE
35 BT_RESET

S601 - 603, 651 - 653

(TOP PANEL KEYS)

D903

D909, 910

D102

D908

POWER

CONTROL

Q902

D904

D905

D907

70

CTL_PWR

49

CTL_V5A

59

INPUT SEL

50

AUDIO_DET

VBUS

DAMP +13V

A +5V

16

AC CUT

10

RESET

VOLTAGE

DETECT

IC102

RESET

SWITCH

Q101

JACK

BOARD

(2/2)

13V

OVER

VOLTAGE

DETECT

Q903

+6V

REGULATOR

IC405

DC/DC

CONVERTER

IC903

VBUS

SWITCH

IC901

+5V

REGULATOR

IC403

37

BT_CTL_PWR

BT +3.3V

+5.1V

+3.3V

REGULATOR

IC103

A +3.3V

+3.3V

REGULATOR

IC404

B+ SWITCH

Q901

OVER

VOLTAGE

DETECT

Q906

OVER

VOLTAGE

DETECT

Q907

17

VBUS_OCP_DET

SYSTEM +3.3V

+3.3V

REGULATOR

IC104

L_IN

R_IN

JACK

BOARD

(1/2)

X401

12.288MHz

LCH_P

LCH_N

BT

BOARD

USB

BOARD

RCH_P

RCH_N

URAT_RX
URAT_TX
URAT_CTS
URAT_RTS

RESET

MUTE

45

DAMP_SDA

46

DAMP_SCL

71

DAMP_FAULT

48

DAMP_PDN

47

DAMP_RESET

11 XO

13 XI

OVER LOAD

DETECT

Q402

SP1

(WOOFER)

X101

8MHz

: AUDIO

: AUDIO IN

SIGNAL PATH

MIX

AMP

IC302

LINE
AMP

IC303

MIX AMP

IC305

LEVEL

DETECT

IC301

INPUT

SELECT

IC304

A/D CONVERTER

IC402

13 VINL

14 VINR

9

DOUT

8

BCK

7

LRCK

6

SCKI

POWER AMP

IC406

22 SDIN

1

OUTA

46

OUTB

SP2

(TWEETER)

39

OUTC

36

OUTD

21 SCLK
20 LRCK
15 MCLK

CLOCK

BUFFER

IC401

23 SDA
24 SCL
14 FAULT
19 PDN
25 RESET

PROTECT

DETECT

Q401

72

DC_DET (PROTECT)

+

+

SRS-BTV25

Note:
•  All capacitors are in μF unless otherwise noted. (p: pF) 50 

WV or less are not indicated except for electrolytics and 
tantalums.

•  All resistors are in Ω and 1/4 W or less unless otherwise 

specifi ed.

•      f  : Internal component.
•  C : Panel designation.

•  A : B+ Line.
•  Voltages and waveforms are dc with respect to ground 

under no-signal conditions.

  no mark : AUDIO IN
•  Voltages are taken with VOM (Input impedance 10 M

).

  Voltage variations may be noted due to normal production 

tolerances.

•  Waveforms are taken with a oscilloscope.
  Voltage variations may be noted due to normal production 

tolerances.

•  Circled numbers refer to waveforms.

• Signal path.
  F : 

AUDIO

  f : 

AUDIO 

IN

Note:
•  X : Parts extracted from the component side.
•  Y : Parts extracted from the conductor side.
•      f  : Internal component.
• 

 : Pattern from the side which enables seeing.

  (The other layers’ patterns are not indicated.)

Caution:
Pattern face side: 
(SIDE B)
Parts face side:
(SIDE A)

Parts on the pattern face side seen 
from the pattern face are indicated.
Parts on the parts face side seen from 
the parts face are indicated.

•  Indication of transistor.

 

1

qa (XO)

2

3

4

wa (SCLK)

Ps

3

w; (LRCK)

Ps/DIV

SRS-BTV25

S601

S602

S603

1

3

R601

R603

R604

R605

R606

R607

CN601

CN602

C601

D601

D603

D604

D605

CL601

CL602

CL603

CL604

CL605

CL607

CL608

CL609

CL610

Q601

Q603

Q604

Q605

D605

D603

D601

D604

S651

S652

S653

1

3

R652

CN651

CL651

CL652

CL653

E

E

E

E

AUDIO IN

K

A

K

A

K

A

K

A

POWER

BOOST

–

+

VOL

S601 – 603,

S651 – 653

D601 – 603, 605

A

K

A

MAIN BOARD

CN101

KEYF BOARD   

(SIDE A)

KEYR BOARD   

(SIDE A)

KEYR BOARD   

(SIDE B)

KEYF BOARD   

(SIDE B)

1

10

AUDIO IN

BOOST

     BLUETOOTH
            PAIRING

1-885-092-

11

(11)

1-885-092-

11

(11)

1-885-093-

11

(11)

1-885-093-

11

(11)

A

B

C

D

E

F

1

2

3

(Page 21)

0

3.3

0

3.3

3.3

7.9

0

0

DRC5114Y0L

Q604

DRC5114Y0L

Q603

DRC5114Y0L

Q601

SML-A12MT

D601

SMLA13BDTT86VS2

D603

SML-A12DT

D604

CL601

CL602

CL603

CL604

CL607

CL608

CL609

CL610

1

2

3

3P

CN602

KEY2

KEY3

GND

SML-A12DT

D605

DRC5114Y0L

Q605

CL605

1

2

3

4

5

6

7

8

9

9P

CN601

5V

LED_PWR

LED_BT

LED_BASS

LED_AUDIO

KEY1

KEY2

KEY3

GND

0.1

C601

R606

2.2k

R604

1k

1k

R607

1k

R603

1k

R605

1k

R601

CL652

1

2

3

3P

CN651

KEY2

KEY3

GND

CL653

10k

R652

CL651

S603

VOL –

S602

VOL +

/

S601

AUDIO IN

BOOST

KEYF BOARD

MAIN

(1/4)

BOARD

A

CN101

POWER

Q601, 603-605

LED DRIVE

S651

KEYR BOARD

S653

S652

BOOST

AUDIO IN

PAIRING

BLUETOOTH

2

A

D

5

B

7

C

6

3

F

E

1

4

(Page 22)