+ - - - - - - - - + - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - - - +

s x x

L O C A T I O N

R S

s 3 0 1

C 3 7 1 1

W Y 6 8 5 5 0

W Q 9 0 2 2 0

3 3 0 0 P / 2 5 0

2 2 0 0 P / 2 5 0

s 3 0 4

F 3 7 0 2

W Q 2 1 1 1 0

8 A 1 2 5 V

s 3 0 6

C 3 7 0 1

Z P 4 2 5 4 0

Z P 4 2 3 4 0

C 3 7 1 2

0 . 0 4 7 / 5 0 0

0 . 0 2 2 / 6 3 0

s 3 0 7

C 3 7 0 2

W Q 9 0 2 3 0

C 3 7 0 3

1 0 0 0 P / 2 5 0

s 3 0 8

F I 3 7 1

Z J 5 5 3 1 0

Z R 2 1 5 8 0

2 5 M H

3 0 M H

s 3 0 9

F 3 7 0 1

Z M 6 1 6 5 0

2 . 0 A 2 5 0 V

s 3 1 5

C 3 7 0 6

Z E 6 0 0 1 0

Z E 6 0 0 2 0

2 7 0 / 2 2 0

2 2 0 / 4 0 0

s 3 2 2

R Y 3 7 1

W Q 8 0 4 1 0

| D L S 5 D 1 - O ( M ) 0 . 2 5 | D L S 5 D 1 - O ( M ) 0 . 2 5 | D L S 5 D 1 - O ( M ) 0 . 2 5 |

s 3 2 3

R 3 7 1 7

R D 3 5 4 1 0

1 0

s 3 2 4

C 3 7 2 0

V 7 8 8 7 8 0

1 / 5 0

s 3 2 5

C 3 7 3 4

W E 7 7 3 8 0

C 3 7 3 5

1 / 1 0

C 3 7 3 6

s 3 2 6

C 3 7 2 1

W J 3 3 5 5 0

2 . 2 / 5 0

s 3 2 7

C 3 8 7 3

U U 2 6 8 1 0

U U 2 4 8 1 0

U U 2 6 8 1 0

1 0 0 / 5 0

1 0 0 / 2 5

1 0 0 / 5 0

s 3 2 8

C 3 8 1 7

U R 3 6 7 4 7

4 7 / 5 0

s 3 2 9

C 3 8 2 0

Z D 2 4 2 0 0

4 7 / 5 0

Power

transformer

AC IN

n o _ u s e

T E 3 7 1

R - 3 0 1 9 0 ( 2 6 ) 3 C

S T 3 7 1

C 3 7 0 2

s 3 0 7

C 3 7 0 3

C 3 7 0 7

s 3 0 7

0 . 0 1 / 2 5 0

C B 3 7 2

C B 3 7 3

R Y 3 7 1

s 3 0 4

F 3 7 0 2

s 3 2 2

R 3 7 0 3

1 / 2 P 3 M

:170V

D B L 1 5 5 G

TABGFLH

:300V-340V

C 3 7 0 4

:150V-340V

s 3 0 8

N T P A D 5 R 1 L D N B 0

0 . 2 2 / 2 7 5

T H 3 7 1

F I 3 7 1

D 3 7 0 1

5 k-ohms

10 W

C3706

ZE60010 270/220

ZE60020 220/400

TKABGFLS

WW75170 100/400

W E 7 7 4 2 0

H S 3 7 2

I C 3 7 5

S T R - Y 6 7 5 3

W D 9 6 0 8 0

n o _ u s e

R 3 7 4 0

n o _ u s e

C 3 7 2 4

D A 2 J F 2 3 0 0 L

R 3 7 4 1

D 3 7 0 2

D 3 7 1 6

n o _ u s e

1 S S 3 5 5 V M

C 3 7 1 2

s 3 0 6

1 S S 3 5 5 V M

C 3 7 0 1

s 3 0 6

★ All voltages are measured with a 10M Ω /V DC electronic voltmeter.

★ Components having special characteristics are marked ⚠ and must be replaced

with parts having speciﬁcations equal to those originally installed.

★ Schematic diagram is subject to change without notice.

120

O P E ( 8 )

E X _ S P

3 9 1 - 3 9 5

3 9 0 1 - 3 9 5 0

FRONT PRESENCE L

ZONE2/

E X T R A S P

F.PRESENCE

SPEAKERS

L/R

G F

L H

W Y 8 9 6 5 0

W Q 9 0 2 2 0

1 5 0 0 P / 2 5 0

2 2 0 0 P / 2 5 0

V V 0 7 1 8 0

T 4 A L 2 5 0 V

Z P 4 2 3 4 0

0 . 0 2 2 / 6 3 0

W Q 9 0 2 3 0

1 0 0 0 P / 2 5 0

Z Q 7 2 9 1 0

Z H 8 8 0 2 0

6 0 M H

5 0 M H

Z M 6 1 6 5 0

2 . 0 A 2 5 0 V

W W 7 5 1 7 0

1 0 0 / 4 0 0

Z D 0 4 6 3 0

W Q 8 0 4 1 0

D G 5 D 1 - O ( M ) - I I

R D 3 5 3 2 2

R D 3 5 4 1 0

2 . 2

1 0

V 7 8 8 7 8 0

1 / 5 0

W J 3 3 5 5 0

2 . 2 / 5 0

U U 2 6 8 1 0

U U 2 4 8 2 2

U U 2 6 8 1 0

1 0 0 / 5 0

2 2 0 / 2 5

1 0 0 / 5 0

U R 3 6 7 4 7

Z D 2 4 2 0 0

U R 3 6 7 4 7

4 7 / 5 0

Z D 2 4 2 0 0

U R 3 6 7 4 7

Z D 2 4 2 0 0

4 7 / 5 0

M A I N T R A N S F O R M E R

P a r t N o

V 6 7 9

A 7 5 0

V 7 7 9

P C B M A I N ( 1 )

Y G 9 8 9

Y G 9 9 0

U C

Y G 9 9 5

R S

Y G 9 9 1

T K

Y G 9 9 2

A L H

Y G 9 9 3

Y G 9 9 4

M A I N T R A N S F O R M E R

B G F

Y G 9 9 6

1 5

O P E ( 3 )

A C _ D C

to POWER TRANSFORMER

3 7 1

3 8 0

3 7 0 1

3 8 0 0

P R I M A R Y

S E C O N D A R Y

W E 7 7 4 2 0

C 3 7 1 1

s 3 0 1

H S 3 7 1

F G

V 2 3 3 0 7 0

T 3 7 0 1

L 3 7 0 1

R 3 7 3 7

R 3 7 3 8

R 3 7 3 9

C 3 7 2 2

1 . 5 U H

1 1

n o _ u s e

1 0

n o _ u s e

S T - 5 2 0 9 B - 2

Subtransformer

n o _ u s e

I C 3 7 2

1 5

R 3 7 0 8

R 3 7 1 2

C 3 7 1 6

2 2 K

0 . 0 4 7 / 1 6

T L P 7 8 1 ( D 4 - G R )

R 3 7 2 8

1 K

D 3 7 1 2

1 S S 3 5 5 V M

I C 3 7 4

D 3 7 1 5

D 3 7 1 4

D 3 7 1 3

1 S S 3 5 5 V M

T L P 7 8 1 ( D 4 - G R )

Safety measures

• Some internal parts in this product contain high voltages and are dangerous. Be sure to take safety measures during servicing, such as wearing insulating gloves.

• Note that the capacitors indicated below are dangerous even after the power is turned off because an electric charge remains and a high voltage continues to exist there.

Before starting any repair work, connect a discharging resistor (5 k-ohms/10 W) to the terminals of each capacitor indicated below to discharge electricity.

The time required for discharging is about 30 seconds per each.

C3706 on OPERATION (3) P.C.B.

RX-V681

OPERATION (4)

J K 3 8 1

R 3 8 1 6

TRIGGER OUT

5 . 6

M S J - 0 3 5 - 1 2 A P C

Q 3 8 0 1

C O N T R O L O U T

R 3 8 1 5

1 0 K

+ 1 2 V

M A X 1 0 0 m A

Q 3 8 0 3

D 3 8 0 3

1 S S 3 5 5 V M

D 3 8 0 4

n o _ u s e

D G N D

J K 3 8 2

R M +

I N

REMOTE

M S J - 0 3 5 - 1 2 A P C

J K 3 8 3

R M -

OUT

O U T

M S J - 0 3 5 - 1 2 A P C

+ 5 D S P

R E M O T E I / O

D G N D

R 3 8 0 5

A V - 4

C 3 8 0 3

1 0 0

AV 4

OPTICAL

0 . 1 / 1 6

L 3 8 1

B L M 2 1 P G 6 0 0 S N 1 D

G P 1 F A V 5 1 R K 0 F

R 3 8 1 1

P J 3 8 1

4 . 7 K

1 4

A V - 3

AV 3

COAXIAL

C 3 8 0 9

I C 3 8 1

A V - 2

R 3 8 0 7

R 3 8 1 7

1 3

1 2

1 1

1 0

0 . 1 / 1 6

6 8 0

1 0 0

T C 7 4 V H C U 0 4 F T ( E L

I C 3 8 1

R 3 8 1 3

S H I E L D E D

1 8 K

C O V E R

R 3 8 1 4

1 8 K

I C 3 8 1

A V - 2

C 3 8 1 0

R 3 8 0 8

R 3 8 1 8

AV 2

A V - 3

6 8 0

1 0 0

0 . 1 / 1 6

T C 7 4 V H C U 0 4 F T ( E L

R 3 8 1 2

M S P - 2 5 2 V 1 - 3 0 N I

4 . 7 K

DIGITAL IN

R 3 8 0 6

A V - 1

C 3 8 0 6

1 0 0

AV 1

OPTICAL

L 3 8 2

0 . 1 / 1 6

B L M 2 1 P G 6 0 0 S N 1 D

G P 1 F A V 5 1 R K 0 F

D G N D

OPERATION (3)

Q 3 7 5 1

T 3 7 0 2

R A L 0 3 5 P 0 1

1 0

D 3 7 5 4

R B 1 6 2 L - 4 0

D 3 7 5 6

R B 1 6 2 L - 4 0

D 3 7 5 5

R 3 7 5 4

E E 1 3 1 2 ( S H 1 0 2 2 3 A

3 . 3 K

R B 1 6 2 L - 4 0

Q 3 7 5 2

D 3 7 5 0

R 3 7 5 5

C R 5 4 2 P

1 S S 3 5 5 V M

2 2 0

Q 3 7 5 0

D 3 7 5 2

U D Z V 5 . 6 B

D T C 0 1 4 E U B T L

5 . 6 V

G N D

Q 3 7 0 3

R 3 7 2 3

D 3 7 1 0

C 3 7 2 1

1 0 0

s 3 2 6

1 S S 3 5 5 V M

C 3 7 3 5

C 3 7 2 3

s 3 2 5

D T C 0 4 4 E U B T L

Q 3 7 0 1

C 3 7 3 6

0 . 0 1 ( B )

s 3 2 5

2 S C 4 0 8 1

A C _ P W R

D G N D

D 2 7 0 4 ( K )

R 3 7 2 2

2 . 2 K

R 3 7 1 7

P R Y _ I N

Q 3 7 0 2

s 3 2 3

Page 117 K2

to DIGITAL (1)_CB945

Page 124 I9

t o D I G I T A L

to MAIN (1)_W110

B t o B

5 3 2 9 0 - 1 5 8 0

P N 3 8 1

n o _ u s e

+ 5 A E

+ 3 . 3 A

D G N D

+ 5 D S P

+ 5 A

O P E ( 4 )

C O N N E C T

3 8 1 - 3 9 0

3 8 0 1 - 3 9 0 0

D C _ T R G

+ 1 2 V

R 3 8 2 1

3 3 K

A V 4 _ D

+ 7 A

+ 5 A

+ 3 . 3 A

J 3 8 0 3

R 3 8 7 3

B D 0 0 G A 3 W E F J - E 2

1 2 K

R P 1 7 0 H 3 3 1 B - T 1 - F

R 3 8 2 0

V C C

V O U T

V D D

V O U T

N . C

F B

n o _ u s e

G N D

N . C

G N D

N C

C E

A V 3 _ D

E N

N . C

A V 2 _ D

+ 5 A E

J 3 8 0 1

J 3 8 0 2

A V 1 _ D

t o M A I N

B t o B

Page 125 B5

to MAIN (1)_CB153

R 3 7 7 0

S C N - X H

+ 5 A E

2 . 2

IC375: STR-Y6753

+ 7 A

7.309V

Page 119 J1

- 5 V

-5.852V

to OPERATION (2)_CB347

Switching regulator

V E

+ 5 V

5.801V

W 3 7 0 5

Vcc

UVLO

Reg/Iconst

Latch

OSC

GND

W 3 7 0 3

5 . 6 V

5.594V

Page 117 B6

5 . 6 V

5.594V

to DIGITAL (1)_CB942

G N D

S C N - X H

W 3 7 0 7

5 . 6 V

5.594V

Page 124

G N D

to MAIN (1)_CB102

S C N - X H

P N 3 7 1

N O T I C E

R E S I S T O R

( m o d e l )

W 3 7 0 4

R E M A R K S

+ 3 . 3 M

J A P A N

3.296V

U . S . A

N O M A R K

C A R B O N

D G N D

Page 117 B6

A C P W R _ D E T

C A N A D A

C A R B O N

3.267V

to DIGITAL (1)_CB944

M E T A L

C P U _ N _ R S T

G E N E R A L

3.294V

C H I N A

M E T A L

P R Y

2.415V

TEST

K O R E A

M E T A L

dest U-LH

0.350V-3.000V

F I R E

A U S T R A L I A

6 P 2 5 0 M M B & C

B R I T I S H

C E M E N T

S T A N D A R D

S E M I

C H I P R E S I S T O R

S I N G A P O R E

S O U T H E U R O P E

C A P A C I T O R

T A I W A N

R E M A R K S

R U S S I A N

N O

M A R K

E L E C T R O L Y T I C

L A T I N A M E R I C A

T A N T A L U M

B R A Z I L

N O

M A R K

C E R A M I C

T H A I

C E R A M I C

P O L Y E S T E R F I L M

P O L Y S T Y R E N E

M I C A

P O L Y P R O P Y L E N E

S E M I C O N D U C T I V E C E R A M I C C A P A C I T O R

P O L Y P H E N Y L E N E

C A P A C I T O R

IC382: RP170H331B-T1-FE

Voltage regulator

OUT

Vref

Current Limit

Thermal Shutdown

GND

Pin No.

Symbol

Description

VOUT

Output Pin

GND

Ground Pin

Chip Enable Pin

No Connection

VDD

Input Pin

IC383: BD00GA3WEFJ-E2

300 mA variable output LDO regulator

GND

Vcc

OCP

SOFT

START

–

TSD

C B 3 8 3

T U L

T U E

T U R

+ 7 A

7.294V

+ 5 A E

P S 2 _ P R T

t o O P E ( 2 )

2.070V

- 1 2 V

-12.065V

B t o B

M I C

+ 1 2 V

12.142V

IC381: TC74VHCU04FT

A U X L

Page 119 G1

Hex inverters

to OPERATION (2)_CB345

A U X R

VCC

GND

IC372, 374 : TLP781(D4-GR,F)

Photocoupler GaAs IRED & Photo−Transistor

Startup

D/ST

DRV

OCP/BS

S/OCP

Logic

1 : Anode

FB/STB

2 : Cathode

OLP

FB/OLP

3 : Emitter

4 : Collector

IC373: TL431ACLPR

Adjustable precision shunt regulators

CATHODE

REF

Vref

ANODE

P A R T S

N A M E

F I L M R E S I S T O R

( P = 5 )

F I L M R E S I S T O R

( P = 1 0 )

O X I D E F I L M R E S I S T O R

F I L M

R E S I S T O R

P L A T E R E S I S T O R

P R O O F C A R B O N

F I L M R E S I S T O R

M O L D E D R E S I S T O R

V A R I A B L E

R E S I S T O R

P A R T S

N A M E

Details of colored lines

C A P A C I T O R

Red / full line:

Power supply (+)

C A P A C I T O R

T U B U L A R

C A P A C I T O R

Red /dashed line: Power supply (-)

C A P A C I T O R

Orange:

Signal detect

F I L M

C A P A C I T O R

Yellow:

Clock

C A P A C I T O R

F I L M

C A P A C I T O R

Green:

Protection detect

Brown:

Reset signal

S U L F I D E

F I L M

Blue:

Panel key input

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Yamaha RX-V681 Service Manual page 120

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