Alto SR400A Manuel utilisateur

Service Manual

ALTO

REV.2

Model: SR400A

CONTENTS

1.Specifications

2.Block Diagram

3.Schematic Diagram

4.Printed Circuit Board

5.Test Procedures

6.Structural Drawing

7.Exploded View & Mechanical Parts List

8.Electrical Parts List

Test Result

Model No: SR400A Test Date: 20040916 Tester: MO GUO ZHU

Test Item Test Conditions Spec Test Result Remark

1Power Source AC: 230V；50 Hz

2Idle Current AC 230 V No-Load 5 ±0.5 mV mV across R13 &R15

3Power

Consumption Rated Output.

Aux At 1KHz A

WFLAT

4Rated Output Low Load :4Ω30---31 V THD:0.4↓V

Hi Load :8Ω18----19 V THD:0.8↓_______V

Load 16Ω V_______V

Load ____Ω （25V ）VV

Load____Ω （50V ）VV

Load____Ω （70V ）VV

Load____Ω （100V ）VV

Aux At 1KHz FLAT.

Rated W

5Maximum at

Output 10% THD Aux 1KHz dB

Load ΩWWFLAT

7Hum or Noise VR Line Max（Low ） 7↓ mV mV DSP OFF

VR Line Max (Hi ） 7↓ mV mV DSP OFF

100HZ:

dB 100HZ: dBTone control

Response Input From Aux

Output At 1W 10KHZ: dB 10KHZ: dB

9Puncture Voltage 5mA ，5Sec 3750V V

10 MONITOR Aux 1KHz dB Load ΩFLAT

MONITOR NO: AUX,TAPE,TUNER,CD,MIC1,MIC2

CD PLAYER 1KHz 0dB

TUNER AM/FM

PRIORITY MIC1

TEL.PAGING 1KHz____dB

Load____Ω_______V G-T___dB；

G-R___dB。G-T___dB；G-R___dB。FLAT

ZONE PAGING 100V ALL/ Z1，

Z2，Z3，Z4

AC : OUTPUT

REMOTE AC OUT or DC OUT

SPECIFICATIONS

01-1

Test Result

Model No：SR400A Test Date: Tester：MO GUO ZHU

Test Item 1. Input

Sensitivity 2. Signal/Noise 3. Distortion at

1W 4. Distortion at

Rated 5. Frequency

Response

Test Conditions

Test Result

FLAT Rated

Output 30V/18V

Load 4Ω/8Ω

FLAT Rated

Output 30V/18V

Load 4Ω/8Ω

FLAT Output

at 2V Load 4ΩFLAT Rated

Output 30V/18V

Load 4Ω/8Ω

FLAT Output at

1WREF-3dB

Load 4Ω

Low OUT -9 ±0.5 dBV70↑ dB 0.5↓% 0.4↓ % 22Hz~22KHz↑

Hi OUT -8±0.5 dBV68↑ dB 0.5↓% 0.8↓ % 25Hz~22KHz↑

TUNER dB dB % %

LINE

CD dB dB % %

AUX dB dB % %

TAPE dB dB % %

TUNER dB dB % %

AUX2

CD dB dB % %

AUX dB dB % %

TAPE dB dB % %

TUNER dB dB % %

AUX3

CD dB dB % %

LOW -50±0.5 dBV60↑ dB 0.8↓ % 0.3↓ % 22Hz~22KHz↑

HI -50±0.5 dBV60↑ dB 0.5↓% 1↓ % 25Hz~22KHz↑

24V dB dB % %

MIC

UNBAL dB dB % %

MIC dB dB % %

LINE dB dB % %

24V dB dB % %

MIC-2

UNBAL dB dB % %

MIC dB dB % %

LINE dB dB % %

24V dB dB % %

MIC-3

UNBAL dB dB % %

MIC dB dB % %

LINE dB dB % %

24V dB dB % %

MIC-4

UNBAL dB dB % %

Remark

1. When the above itemsare tested, short circuit the 1st and the 2nd pin of 313115-1 (DSP) CN1. After the

test, remove the short circuit terminal.

2.Load connection: connect LOW output with 4Ohms, and connect HIGH output with 8Ohms.

3. Please check if the bass BOOST circuit is OK. If bass output is below 18V(ON LOAD), BOOST

circuit does not operates. If bass output is above 18V(ON LOAD), BOOST circuit starts operation.

4. FR test: use AP to scan DSP ON and DSP OFF respectively. Refer to the attached figure for frequency

response curves.

Authorization by：Check by：

SPECIFICATIONS

01-2

1234

4321

POWER SWITCH

MIX AMP PRE AMP

HI PRE

LOW PRE LOW POWER

HI POWER

AMP

LOW

V+ & V- V+ & V-

POWER SUPPLY

SWITCH

LOW SPEAKER

HI SPEAKER

LOW V+

LOW V-

HI V-

HI V+

AC INPUT

238094

DSP MODULE

HPF

LPF

Title

Size:

Number

Date:

File: Sheet of:

Drawn By:

Revision

SR400A

SR400A BLOCK DIAGRAM

SR400A 1/1

MO GUO ZHU

VER1.0

第版

SR400A BLOCK DIAGRAM

SIGNAL INPUT

VOLUME

130 deg SW

T6.3A

02-1

12345678

87654321

MIC2

CN-BAL-MALE

ZD5

12V1W

ZD2

12V1W

ZD4

12V1W

ZD3

12V1W

R16

15K

R19

15K

R18

15K

R15

15K

R14

390E

_IC3A

33079 7

_IC3B

33079

10 +

IC3C

33079

12 +

IC3D

33079

C23

22P

C20

22P

C19

22P

C26

22P

C27

0.01uF/400V

R22

10E

SW2A

SW PS-22E85L

SW2B

SW PS-22E85L

GND

3VR1

D50K

R17

4.7K

R21

820E

10 +

_IC1C

33079

C16

0.0033u

R12

10K

R10

10K

_IC1B

33079

0.0033u

10K

R11

6K8

C21

47u/63V

C22

47u/63V

1 2

3 4

5 6

7 8

910

1112

1314

1516

1718

1920

CN2

CN-10PX2-180

910

1112

1314

CN1

CN-7PX2-F

C17

47u/63V

_IC1A

33079

22P

10K

0.0033u

6K8

12 +

IC3D

33079

DL1

SIGN/LIMIT

1K2

+15V

-15V

+5VD

+15V

-15V

NC 1

OUT 2

NC 3

GND

4GND

NC 6

V+ 7

NC 8

NC 9

GND

12 GND

OSC

NC 16

IC2

L4962

220u/63V

330P

C12

0.0022u

3K9

15K

0.033u

C13

2u2 100V

TP-SEV1924-03

C25

470u/25V SLL*

C24

1000u/6V3

+5VD

BYV27

R13

330E

11 4

IC1E

33079

11 4

IC3E

33079

C14

470u/25V SLL

C10

470u/25V SLL

C15

0.1u

C11

0.1u

+15V

-15V

CLIP

SIGNAL

X1X2

MIC1

XLR

+5VA

HIGH

LOW

FROM INPUT TO 313115-1 DSP BOARD

HIGH INPUT

+4dB

FL5R

FL5R C28

10u/63V

C18

10u/63V

C29

10u/63V

SW1

Title

Size:

Number

Date:

File: Sheet of:

Drawn By:

Revision

SR400A

P-110018-SR400A

2004/08/27

SR300A 1/1

MO GUO ZHU

VER1.0

TO 313120-1 AMP PCB

1第版

03-1

1 2 3 4

4321

T6.3A

D1 KBPC25

GBU8D

1N4002

0.01uF400V

C1400V/10N

+VCC1

-VCC1

+VCC2

-VCC2

Vac

KBU806

BP25-06PWS

Title

Size:

Number

Date:

File: Sheet of:

Drawn By:

Revision

SR400A

P-313121-1

2004/08/27

SR300A 1/1

MO GUO ZHU

VER1.0

第版

黃

橙

藍

紫

棕

03-2

1234

4321

R27

390E

R33

R59

68K

R39

4K7

R40

12K

R31

470E

R23

820E R24

68E

R22

12K

R21

8K2

R52

8K2

R51

47E

R53

47K

R17

2K2

R55

R32

12K

R18

470E

R20

12K

560E

R10 1K5

R56

8K2

R58

47E

R66

8K2

R57

12K

R28

68E

R25

820E

R44

68K

R29

12K R46

4K7

R42

390E

R16

470E

R43

2K2

R59

47K

C17

220P

C24

470P

C21

470P

C23

0.0047U

C15

100P

0.001U

C25

0.0047

C14

100P

TR9

NJE350

TR13

MJE350

TR7

MJE340

TR5

MJE340

TR12

2N5401

TR10

2N5551

D11

1N4002

TR1

MJE802

R34

8K2 2W

D10

7V5 1W

D14

7V5 1W

C18

220U/25V

D13

1N4002

D25

1N4002

D17

1N4002

D12

1N4002

VR1 470E

C25

10/50V

TR21

MJE340

TR15

NJE15031 TR8

TIP36C

TR4

MJE15030

TR2

2SC5200

R17

10E

R19

4E7

D24

1N4002

D14

6A2

C16

0.1U

TR19

MJE350

TR6

MJE15031

TR20

MJE15030

TR3

2SA1943

TR14

TIP35C

1N4002

6A2

R60

47K

R64

4K7

R63

10K

47K

D17

1N4148

TR23

BC847

TR24

BC847

TR22

BC847

TR25

BC857

TR18

BC857

TR11

BC32725

TR17

BC857

C28

1000U/6V3

C23

220U/50V

R48

330E

R35

10K

R49

33K

R47

10K

R61

10K

R62

10K

R37

470E

R36

10K

R46

150K

C22

1U/50V

0.1U

C13

0.0047U

R41

8K2 2W

C20220U 25V

R15

0E2 5W

R13

0E2 5W

C10

220P

1N4148

R14

10E

R26

4E7

C27

0.0047U

_IC6B

MC33078

IC6A

MC33078

IC5A

MC33078

_IC5B

MC33078

R78

15K

R77 22K

R80

R76

R75

47K

R74

100K

R71

15K R70 47K

R73

10E

R11

10K

DL2 47P

C35 33P

C31

4N7

22UF/50V

10UF/50V

D27

4148 D26

4148

DL1 47P

MUTE

ST-BY

IC1

TDA7294

22K

R21

10K

R32

33K

R12

22K

R12

10E 0.5W

0.1U

4148

680E

+VCC1

-VCC1

+VCC1

-VCC1

+VCC2

-VCC2

Vin

GND

Vout

IC3 7915

Vin

GND

Vout 3

IC4 7815

C11

10000/50V

C12

10000/50V

C36

10/25V

C37

10/25V

CN1

6P/P=3.96

10000/63V

Vin

GND

Vout 3

IC2 7805

C33

1000U 6.3V

R79

47E/5W C32

2200U/63V

+VCC1

-VCC1

+VCC2

-VCC2

-15V

+5VA

+15V

-15V

+15V

-15V

+15V

-15V

1N4148 TR16

BC857

R30

10K

-15V

R69

100E PTC

+15V

C39

330P

C40

330P

or NJL21184

or SIMILAR

or MJL21193

+15V

C36

10U NP

1U 50V NP

TDA7294

910

11 12

13 14

CN2

CN-7PX2-F

+15V

RL1

OZ-SS-124LM1

DC 24V 16A

+5VA

-15V

HIGH OUT +

GND

LOW OUT+

GND

Hi SPEAKER

LOW SPEAKER

Title

Size:

Number

Date:

File: Sheet of:

Drawn By:

Revision

SR400A

P-313120-1-SR400A

2004/08/27

SR300A 1/1

MO GUO ZHU

VER1.0

1第版

FROM 110018 INPUT PCB

SOFT START

OFFSET PROTECTION

-7.7V

14.9V

8.84V

14.2V

9.4V

8.6V

0.2V

-0.5V

0.6V

20.2V

7.6V

24V

-24V-20.2V

-7.6V

-0.34V

-1.4V

+1.4V

D21

27.0K

DL2

TO POWER LED

03-3

04-1

TOPLAYER&TOPOVERLAY

BOTTOMLAYER

04-2

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