Technics SA-DV250 Manuale utente

http://servis-manual.com/

Service Manual

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ORDERNO.AD0103076C2

Stereotuner/amplifier

lSA-DV250

Colour

(S).......................SilverType

Areas

EB.......................Great Britain.

EG.......................Europe.

System:SC-DV250

Becauseofuniqueinterconnecting cables,when a

compact requiresservice,send orbring in theentire

system.

Specification

•AmplifierSection (Lowfrequencyside)

Poweroutput

DIN100Hz, THD 1%,8 bothchannelsdriven:

2x45W

RMS 100Hz,THD 10%,8 bothchannelsdriven:

2x65W

•AmplifierSection (Highfrequencyside)

Poweroutput

DIN1kHz,THD 1%,6 bothchannelsdriven:

2x25W

RMS 1kHz, THD 10%,6 bothchannelsdriven:

2x35W

Poweroutput(prologic mode)

DIN (front: high frequency)1kHz,THD 1%, 6 bothchannelsdriven:

2x25W

(front: lowfrequency) 100Hz,THD 1%,8 bothchannelsdriven:

2x45W

(surround) 1kHz,THD 1%, 8 bothchannelsdriven:

2x30W

(center) 1kHz,THD 1%, 8 :60W

RMS

(front: high frequency)1kHz,THD 10%,6 bothchannelsdriven:

2x35W

(front: lowfrequency)100Hz,THD 10%,8 bothchannelsdriven:

2x65W

(surround) 1kHz,THD 10%,8 bothchannelsdriven:

2x40W

(center) 1kHz, THD 10%, 8 :80W

• Totalharmonicdistorition

Ratedpowerat 1kHz/6 :1%

Halfpowerat 1kHz/ 6 :0.1%

• Loadimpedance

Front (high frequency): 6

(lowfrequency): 8

Surround: 8

Center: 8

• FM tunersection

Frequencyrange: 87.50-108.00MHz

(0.05MHzsteps)

Sensitivity(S/N26dB): 1.5μV

S/N: MONO 70dB

(75dB,IHF)

Antennaterminals: 75 (unbalance)

• AMtunersection

http://servis-manual.com/

7.1Todisplay themalfunctioncode

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Fig. 7-1

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U70 DVD:

Automaticallydisplayson the

U70 DECK:

tuner/amplifierwhenamalfunction occurs.RefertoFig. 7-1.

F61: Automaticallydisplayson thetuner/amplifierwhenamalfunction occurs.RefertoFig.7-1.

http://servis-manual.com/

7.2Toreturntothenormal display

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1. ForU70 DVD/U70 DECK

¡Pressananyoperation button on thetuner/amplifier.

¡Tore-display thecode,switchthepoweroff(POWERSTANDBYbutton),and then

switchpowerbackon again.

2. ForF61

¡IfF61 isdisplayed, thepowerwill automaticallybeswitchedoff and thestandby

indicatorwill lightup.

¡F61 will bedisplayed for3 seconds,and thentheclockwillbedisplayed.

¡Tore-display thecode,switchthepoweron.F61 will bere-displayed, and thenafter3

secondstheclockwill bedisplayedand thepowerwill automaticallyswitchoff.

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http://servis-manual.com/

7.3.1U70 DVD,U70 DECK/(displayed

automatically)

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lProblemorcondition

Abus-linecommunicationserrorhasoccurredasaresult oftheflatcablesbeinginserted

incorrectly, thuspreventingthesystemfromoperating.

¡IfU70 isdisplayedon thetuner/amplifier, theCassettedeckorDVD Changercannotbe

operatedby remotecontrol.

lCorrection Procedure

1.Tocheckforcorrectinsertion oftheflatcables.

nInserteachconnectorsuntil you hearaclick.

nInserttheflatcablesatthebackoftheunit intheorderindicated.RefertoFig.8-

Makesurethewhitesideofthecablesison yourrightside.RefertoFig.8-3.

Fig. 7-2.

Fig. 7-3.

2.Breakageoftheflatcables.(Checkand replace.)

3.Iftheproblemisnotcorrectedby items1 and 2above,thisindicatesafaultyIC.

SA-DV250:

IC901 (C2BBFD000317)

http://servis-manual.com/

SL-DV250:

IC401 (M38504E6227F)

RS-DV250:

IC701 (M38503M2406F)

ChecktheseICsand replace.

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http://servis-manual.com/

7.3.2F61

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lProblemorcondition

Whenthepowerswitchisswitchedon,it automaticallyswitchesback off,makingit

impossibleto switchpoweron.

lCorrection procedure

FaultyTuner/Amplifier(SA-DV250)outputIC(IC601).

(WhenaDCvoltageisappliedtospeakerterminals.)

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S904

(PLAY/ REC)

SCHEMATIC DIAGRAM-1

FL901 (A2BB00000084)

S908

(INPUT SELECTOR)

S907

(SET)

S906

(TUNING MODE)

S905

(FM AUTO/MONO)

JK903

PHONES

3.5mm STEREO

R997

150

R996

150

D973

MA4030MTA

C921

1000P

C922

35V33

C920

25V22

R922

10K

R921

10K

R944

2.2K

R912

4.7K R911

3.3K R910

2.2K R909

1.8K R916

1.5K R915

1.2K R914

1K R913

820

R907

3.3K R906

2.2K R905

1.8K R904

1.5K R903

1.2K R902

1K R901

820

FL DISPLAY

1 6 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 53 542 5 7 9

W905

S901

(/)

C928

25V22

NOTE:

The number which noted at the connectors on the schematic diagram as

"SCHEMATIC DIAGRAM-1" or "SCHEMATIC DIAGRAM-2"

indicates the schematic diagram serial number located on the left corner in the schematic diagram.

AOPERATION CIRCUIT

C919

25V22

C927

25V22

C396

0.047

C923

0.1

C395

0.047

D974

MA165TA

C907

470P

C924

0.1

C904

0.01

R924

C908

470P

R925

S914

(PS)

S915

(PTY)

S910

(TUNING, )

S911

(TUNING, )

S912

(TUNER/ BAND)

S913

(DIGITAL

S.WOOFER)

(RDS DISP MODE)

ABCD

FGH I JKLMNOPQRSTU

ABCDEFGHIJKLMNOPQRSTUVWXYZ

S902

(CLOCK/ TIMER)

S903

(-DEMO)

:AUDIO SIGNAL LINE

SCHEMATIC DIAGRAM-2

IC901

C2BBFD000317

SYSTEM CONTROL/

FL DRIVE

Q901

UN4212TA

RESET

R936

100

R919

15K

R991

47K

R918 10K

R928 47K

L902 1 H

D901

1SS291TA

L901

10 H

R951

330K

R952

10M

R993

100K

D931

MA165TA

D933 MA165TA

R990

100K

C916

6.3V100

D951

LNJ301MPUJAD

(DIGITAL S.WOOFER)R995

220

D954

SELS5923C

(PLAY/ REC)R986

1.5K

D306

SELS5223C

( ) R939

1.5K

C905

1000P

C901

6.3V100

R935 100

R934 100

R988 1K

R937 10K

R987 1K

R926

2.2K

C912

0.1

R954

100K

C926

1000P

R960 1.5K

R958 1K

R999

100K

R959 47

R969

2.7K

D902

1SS291TA

C903

0.01

C902

10V1000

X902

(32.7kHz)

C911

18P

C910

20P

X901

(6MHz)

D905 1SS291TA

EFIKLMNO Q

R940

R929 1K

R930 1K

R932 1K

R931 1K

R976

100K

R956

1K R957

C915

0.01 C925

1000P

R953 100

C914

50V2.2

D904

MA165TA

ABCDEFGHI JKLMNOPQRST UVWX

3132333435363738394041424344454647484950

81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99

100

P13

P14

P15

P16

P17

P18

P19

P20

P21

P22

P23

P24

P25

P26

P27

P28

P29

P30

P31

P32

VDD4

P33

P34

P35

P36

P37

P38

REGIN0

REGIN1

REMOCON

RDS DATA

RDS CLK

HP SW

MIC DET

VR JOGA

VR JOGB

NC(GND)

SH REQ

KEY KARAOKE

KEY TU

VDD1

XC OUT

XC IN

Vss

X OUT

XIN

RESET

AC IN

SEL/ TUNER

SEL TUNER

ST/ AV.6CH

LC72 CK

LC72 DI/ ST

LC72 CE

LC72 DO

CHECK

STAND-BY

TIMER

S.W.LED

LOUNGE

CHORUS

MUTE

POWER

Vss2

VDD2

MUTE2

MUTE3

SHCS

SHDO

SHDI

SHCK

E DET

CR TIMER

VDD3

P12

P11

P10

R994 100K

R949

4.7K

R950

100

: POSITIVE VOLTAGE LINE : NEGATIVE VOLTAGE LINE

5.1V

2V/2ms.DIV.

T10ms.

2V/2ms.DIV. 0V

30.1V

29.3V

26.3V

20.5V

29.3V

23.5V

20.5V

23.4V

23.7V

20.7V

29.6V

23.7V

26.6V

26.5V

5.1V

29.5V

26.5V

17.2V

5.3V

10.3V

0.4V

23.4V

20.5V

26.3V

5.1V

23.4V

20.5V

26.2V

29.2V

26.2V

26.1V

26.3V

23.5V

25.6V

27.5V

25.5V

23.5V

25.6V

5.1V

2.6V

0.6V

5.1V

1.4V

5.1V

2.3V

2.7V

1.6V

2.2V

5.1V

4.6V

2.5V

5.1V

3.3V

1.9V

1.4V

5.1V

4.8V

FM / AM

30V

T 5.5ms.

30V

FM / AM

3.3V

P-P

F=6MHz

FM / AM

4.2V

P-P

F=6MHz

FM / AM

5.2V

P-P

F=32.7kHz

FM / AM

5.2V

P-P

F=32.7kHz

FM / AM

P-P

F=32.7kHz

FM / AM

SCHEMATIC DIAGRAM-3

W901B

W902B

IC151

C1BB00000527

RDS SIGNAL

DEMODULATOR

123

X151

R158

R154

100K

R153

100K

COM

Q902

UN411FTA

MUTING CONT.

ABC

8 9

VREF

HPX IN

VDDA

VssA

FL OUT

CIN

TEST

X OUT

IDR

RDCL

RDDA

RST

MODE

VDDB

VssB

XIN

R962

22K

VR901

EVQVBXFK124B

(VOLUME)

R945

100

R961

22K

R943

100

C917

0.01

C155

1000P

C153

1000P

C160

1000P

C159

6.3V47

R152

R151

C154

560P C158

6.3V47

C151

16V10 D907

MA165TA

R946

C909

1000P C918

6.3V100

DEA

R941

L153

R155

120

D151

MA4051MTA

L151

100 H

L152

100 H

C156

47P

C157

47P

AOPERATION CIRCUIT

R942

2.2K

R974

C931

16V10

R965

3.9K

R966

3.9K

D961

MA4075MTA R975

22K

D906

MA165TA

Z901

B3RAD0000028

(REMOTE SENSOR)

R157

C152

330P

: POSITIVE VOLTAGE LINE : NEGATIVE VOLTAGE LINE

-30.1V

5.1V

:AUDIO SIGNAL LINE

7.6V

3.3V

2.6V

5.1V

2.5V2.7V

2.5V

5.1V

2.5V

SCHEMATIC DIAGRAM-4

W902A

W901A

CP101

DET

Rch IN

Lch IN

+B(2)

+B(1)

T.GND

Q707

2SB1417PQTA

REGULATOR

Q723

2SC3940AQSTA

REGULATOR

R763

4.7K

R230 1K

R229 1K

D721

MA4300MTA R708

4.7K

C707

0.047

C706

35V10

C737

100

SOUND

PROCESSOR

(SH-DV250)

To TUNER UINT

on SCHEMATIC

DIAGRAM-10

C735

0.047

R563

2.7K

R564

2.7K

C660

16V10

C659

16V10

R615

4.7K

R614

4.7K

R631

3.9K

R632

3.9K C202

0.1

R203

100K

R204

100K

C201

0.1

C602

16V10

C708

0.047

R211

270

D201

MA4056MTA

R687

1.5K

R688

1.5K

Q605,606

2SD2144STA

MUTING Q605

Q606

R683

R617

4.7K

X0X1VDD

Vss

INHZ0Z1Y1 Y0

16 15 14 13 12 11 10 9

12345678

IC201

BU4053BCFE2

SIGNAL SELECTOR

C655

16V10

C656

16V10

R606

4.7K

R605

4.7K

C601

16V10

R598

2.2K

R597

2.2K

R205

100K

R202

100K

C509

0.01

C510

0.01

R693

R692

C664

16V10

C725

16V47

R696

47K

Q609,610

2SD2144STA

MUTING

Q609

Q610

Q612

UN411FTA

MUTING CONT.

CR694

22K

R511

47 R509

R512 47 R510 47

W501

D719

RL1N4003N02

D720

RL1N4003N02

D717

RL1N4003N02

D718

RL1N4003N02

R695

470

D611

MA4051MTA

C740

16V10

C733

0.047

D737

MA4082LTA

R764

330

MAIN CIRCUIT

C731

1000P

C741

0.1

TUNER Lch/C

TUNER Rch

A.GND

Lch IN

Rch IN

+B(10V)

SUR L

SUR R

S.W

MIC

10V)

V.GND

D.GND

CS/ REQ

CLK

DATA

CT GND

SH FL1

SH FL2

SYNC

R603

3.3K

R684

C715

6800

C714

1000P

D705

RL1N4003N02

: POSITIVE VOLTAGE LINE

: NEGATIVE VOLTAGE LINE : FM SIGNAL LINE

: AM SIGNAL LINE

14.7V

10.4V

37.3V

30.1V

30.7V

14.7V7.2V

7.8V

10V

10.2V

5.1V

4.9V

10V

0.7V

:AUDIO SIGNAL LINE

5.7V 0V 0V 0V 0V 0V

7.2V

7.6V

10.4V

0V 0V

10.4V

:MIC SIGNAL LINE

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