Alto SR400A Service Manual Download Page 1 | Manualshive

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Alto SR400A Service Manual Download Page 1

Service Manual

ALTO

REV.2

Model:

SR400A

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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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