Alto SR400A Service Manual Download Page 24

│││├0016---------------------------

CI00090

SMD ceramic capacitor 0603

0.0047uF/50V X7R ±10%

1 C31

│││├0017---------------------------

SE00011

SMD rectifier diode

RLS4148 0.5A (LL-34)

5 D1,D8,D9,D26,D27

│││├0018---------------------------

SF00031

SMD transistor

BC847B(SOT-23)/(PHI)

3 TR22,TR23,TR24

│││├0019---------------------------

SF00032

SMD transistor

BC857B(SOT-23)/(PHI)

4 TR16,TR17,TR18,TR25

│││├0020---------------------------

SG00040

SMD integrated circuit

MC33078DT(ST)MC33078D(ON)

2 IC5,IC6

│││└0022---------------------------

CI00267

SMD ceramic capacitor-RS 0603

33PF/50V NPO ±5﹪

1 C35

││├0002-----------------------------

RA00668

fixed resistor 1/8W

47Ω M type

2 R51,R58

││├0003-----------------------------

RA00670

fixed resistor 1/8W

68Ω M type

2 R24,R28

││├0004-----------------------------

RA00677

fixed resistor 1/8W

390Ω M type

2 R27,R42

││├0005-----------------------------

RA00635

fixed resistor 1/8W

470Ω M type

3 R16,R18,R31

││├0006-----------------------------

RA00636

fixed resistor 1/8W

560Ω M type

1 R9

││├0007-----------------------------

RA00638

fixed resistor 1/8W

820Ω M type

2 R23,R25

││├0008-----------------------------

RA00639

fixed resistor 1/8W

1.0KΩ M type

2 R33,R55

││├0009-----------------------------

RA00641

fixed resistor 1/8W

1.5KΩ M type

1 R10

││├0010-----------------------------

RA00643

fixed resistor 1/8W

2.2KΩ M type

2 R43,R54

││├0011-----------------------------

RA00647

fixed resistor 1/8W

4.7KΩ M type

2 R39,R45

││├0012-----------------------------

RA00650

fixed resistor 1/8W

8.2KΩ M type

4 R21,R52,R56,R66

││├0013-----------------------------

RA00652

fixed resistor 1/8W

12KΩ M type

6

R20,R22,R29,R32,R40,R57

││├0014-----------------------------

RA00659

fixed resistor 1/8W

47KΩ M type

3 R8,R53,R59

││├0015-----------------------------

RA00661

fixed resistor 1/8W

68KΩ M type

2 R38,R44

││├0016-----------------------------

RA00322

fixed resistor 1/4W

4.7Ω M type

2 R19,R26

││├0017-----------------------------

RA00159

fixed resistor 1/4W

10Ω Mr type

2 R14,R17

││├0018-----------------------------

RA00204

fixed resistor 1/4W

470Ω M type

1 R37

││├0019-----------------------------

RA00099

fixed resistor 1/2W

10Ω M type

1 R12

││├0020-----------------------------

RA00047

metal-oxide-film resistor 2W

8.2KΩ P type

2 R34,R41

││├0021-----------------------------

RA00091

chassis bracket 5W

0.2Ω(P)

2 R13,R15

││├0022-----------------------------

RA00852

chassis bracket 5W

47Ω SQP

1 R79

││├0023-----------------------------

RC00164

resistor

500Ω φ8 RB

1 VR1

││├0024-----------------------------

CA00016

ceramic capacitor

47PF NPO

2 DL1,DL2

││├0025-----------------------------

CA00024

ceramic capacitor

100PF SL

2 C14,C15

││├0026-----------------------------

CA00029

ceramic capacitor

220PF Y5E

2 C10,C17

││├0027-----------------------------

CA00034

ceramic capacitor

470PF Y5E

2 C21,C24

││├0028-----------------------------

CA00040

ceramic capacitor

0.001uF Z5V

1 C1

││├0029-----------------------------

CA00069

ceramic capacitor

390PF Y5E

2 C39,C40

││├0030-----------------------------

CH00017

laminated capacitor

0.1uF/50V Y5V PH5

2 C16,C19

││├0031-----------------------------

CC00012

mylar capacitor

0.0047uF/100V 10%

4 C13,C25,C26,C27

││├0032-----------------------------

CC00040

mylar capacitor

0.1uF/100V

1 C5

││├0033-----------------------------

CB00010

electrolytic capacitor

1uF/50V φ4*7mm

1 C22

││├0034-----------------------------

CB00005

electrolytic capacitor

1uF/50V NP φ5*11mm

1 C2

││├0035-----------------------------

CB00026

electrolytic capacitor

10uF/50V φ6*7mm

5 C4,C6,C7,C37,C38

││├0036-----------------------------

CB00020

electrolytic capacitor

10uF/50V NP φ5*11mm

1 C36

││├0037-----------------------------

CB00032

electrolytic capacitor

22uF/50V φ6*5mm

1 C3

││├0038-----------------------------

CB00057

electrolytic capacitor

220uF/25V φ8*11mm

3 C18,C20,C23

││├0039-----------------------------

CB00069

electrolytic capacitor

1000uF/6.3V φ8*11mm

2 C28,C33

││├0040-----------------------------

CB00168

electrolytic capacitor

2200uF/63V φ22*30mm

1 C32

││├0041-----------------------------

CB00098

electrolytic capacitor

10000uF/50V φ30*45mm

2 C11,C12

││├0042-----------------------------

CB00099

electrolytic capacitor

10000uF/63V φ35*40mm

2 C8,C9

││├0043-----------------------------

HC00324

connect terminal

6.5m/m (PC250)

4 S1,S2,S3,S4

││├0044-----------------------------

HA02532

wire

6P(male)-6P(male) 50mm UL2468 22AWG

1

││├0045-----------------------------

HC00179

connector(male)

6P 3.96mm 180°

1 CN1

││├0046-----------------------------

HC00050

row-wire header

14PIN A28b-14B.T.6

1 CN2

││├0047-----------------------------

SA00093

rectifier diode

1N4148 0.5A

2 D5,D7

││├0048-----------------------------

SA00094

rectifier diode

1N4002/100V

8

D4,D6,D11,D12,D13,
D17,D24,D25

││├0049-----------------------------

SA00097

rectifier diode

6A2 6A

2 D2,D3

││├0050-----------------------------

SA00102

zener diode

1W 7.5V 1N4737

2 D10,D14

││├0051-----------------------------

SD00084

integrated circuit

TDA7294(S&T)

1 IC1

││├0052-----------------------------

SB00059

transistor

BC327-25

1 TR11

││├0053-----------------------------

SB00073

transistor

2N5550/2N5551

1 TR10

││├0054-----------------------------

SB00074

transistor

2N5401

1 TR12

││├0055-----------------------------

SB00060

transistor

MJE340 (ST)

3 TR5,TR7,TR21

││├0056-----------------------------

SB00061

transistor

MJE350 (ST)

3 TR9,TR13,TR19

││├0057-----------------------------

HI00009

relay

OZ-SS-124LM1 24V/16A

1 RL1

││├0058-----------------------------

NI02516

cushion

φ4*8mm PW-2

12

││└0059-----------------------------

AC00179

tin without lead

M705E Sn 3Ag-0.5Cu

40

│├0047-------------------------------

HK04350

PC board

P-110018-SR300A

1

││├0001-----------------------------

HB00876

PCB

110018_VER060308

1

││├0002-----------------------------

RA00339

fixed resistor 1/8W

330Ω M type

1 R13

││├0003-----------------------------

RA00340

fixed resistor 1/8W

390Ω M type

1 R14

││├0004-----------------------------

RA00350

fixed resistor 1/8W

820Ω M type

1 R21

08-3

Summary of Contents for SR400A

Page 1: ...Service Manual ALTO REV 2 Model SR400A...

Page 2: ...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...

Page 3: ...d____ 70V V V Load____ 100V V V Aux At 1KHz FLAT Rated W 5 Maximum at Output 10 THD Aux 1KHz dB Load W W FLAT 7 Hum or Noise VR Line Max Low 7 mV mV DSP OFF VR Line Max Hi 7 mV mV DSP OFF 8 100HZ dB 1...

Page 4: ...22KHz HI 50 0 5 dBV 60 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 M...

Page 5: ...OW V V V V HI POWER SUPPLY SWITCH LOW SPEAKER HI SPEAKER LOW V LOW V HI V HI V AC INPUT 238094 DSP MODULE HPF LPF Title Size A3 Number Date File Sheet of Drawn By Revision SR400A SR400A BLOCK DIAGRAM...

Page 6: ...2 13 14 CN1 CN 7PX2 F C17 47u 63V 1 2 3 _ IC1A 33079 C7 22P R4 10K R5 10K C6 0 0033u R3 6K8 14 13 12 _ IC3D 33079 1 3 2 DL1 SIGN LIMIT R9 1K2 15V 15V 5VD 15V 15V NC 1 OUT 2 NC 3 GND 4 GND 5 NC 6 V 7 N...

Page 7: ...4 T6 3A F2 T6 3A D1 KBPC25 D4 GBU8D D2 1N4002 C2 0 01uF400V C1 400V 10N S1 S4 S3 S5 S2 VCC1 VCC1 VCC2 VCC2 Vac KBU806 BP25 06PWS Title Size A4 Number Date File Sheet of Drawn By Revision SR400A P 3131...

Page 8: ...R14 10E R26 4E7 C27 0 0047U 7 6 5 _ IC6B MC33078 1 2 3 4 8 _ IC6A MC33078 1 2 3 4 8 _ IC5A MC33078 7 6 5 _ IC5B MC33078 R78 15K R77 22K R80 1K R76 1K R75 47K R74 100K R71 15K R70 47K R73 10E R11 10K D...

Page 9: ...04 1...

Page 10: ...TOPLAYER TOPOVERLAY BOTTOMLAYER 04 2...

Page 11: ...04 4...

Page 12: ...04 3...

Page 13: ...to amplifier high output Par 3 Initial test Increase slowly the VARIAC voltage up to the nominal value 230Vac Check the transformer sec voltages with multimeter without signal on input S1 S2 90V 1 5Va...

Page 14: ...ifier Decrease to zero the signal generator then adjust VR1 trimmer to have a 5mV 0 5mVdc voltage drop across R13 R15 0 22 power resistors Par 8 HIGH amplifier check Select a 10KHz frequency with 0dB...

Page 15: ...peaker Module Test Condition 1 Short circuit 2P pins of CN1 on DSP board 313115 1 board 2 LINE INPUT 1kHz LOW output 2V 4Ohm 3 The upper curve is for treble output frequency response and the lower one...

Page 16: ...05 4...

Page 17: ...06 1...

Page 18: ...06 2...

Page 19: ...06 3...

Page 20: ...07 1...

Page 21: ...14 NI03152 headle ABS 85 6 207 7 black _V1 0 2 15 MG00361 black screw pill M4 20mm 12 16 NI031151 handle cover ABS SR 400A SR 500SA black_V1 0 2 17 NC00217 K speaker wooden box SR 400A 12 inch PLYWOO...

Page 22: ...61 screw M4 20mm 12 0010 ND00381 absorb sound sponge 30 300 400mm_V1 0 1 0011 ND00382 absorb sound sponge 30 400 750mm_V1 0 1 0012 MG00351 screw M4 16 10 0013 ND00367 EV foam 2 0t 100 18mm black_V1 0...

Page 23: ...G00363 copper pillar M3 14 0 5PH 3 0032 MG00024 screw M3 7 0 5PH 19 0033 MG00027 screw M3 12 13 0034 MG00042 screw M3 10 2 0035 MG00327 screw M3 10 0 5PH 4 0036 MG00069 screw M4 16 1 0037 MF00014 wash...

Page 24: ...Y5E 2 C21 C24 0028 CA00040 ceramic capacitor 0 001uF Z5V 1 C1 0029 CA00069 ceramic capacitor 390PF Y5E 2 C39 C40 0030 CH00017 laminated capacitor 0 1uF 50V Y5V PH5 2 C16 C19 0031 CC00012 mylar capaci...

Page 25: ...JY 5030 030G 180 1 MIC2 0036 HC00582 balance MIC jack NCJ6FI V NEUTRIK 1 MIC1 0037 TC00004 transformer SEV1924 03 EE 19 1 L1 0038 CG00018 filter EMI FILTER LF 22UH WAH TAYI 2 L2 L3 0039 NI02532 LED sp...

Page 26: ...I00063 SMD ceramic capacitor 0603 470PF 50V NPO 5 4 C8 C10 C11 C13 0025 CI00075 SMD ceramic capacitor 0603 0 1uF 50V Y5V 80 20 28 C3 C4 C5 C6 C7 C15 C16 C17 C18 C19 C21 C2 8 C29 C30 0026 CI00266 SMD c...

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