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Alto A400.4 Service Manual
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Alto A400.4 Service Manual

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See also: Owner's Manual
MODEL: A400.4
www.altoproaudio.com
Version 1.0

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Summary of Contents for Alto A400.4

  • Page 1 MODEL: A400.4 www.altoproaudio.com Version 1.0...

  • Page 2: Table Of Contents

    CONTENT 1. Introduction.....................1 2. Specification....................2 3. Block Diagram..................3 4. Schematic Diagram.................4 5. Wiring Diagram..................10 6. Printed Circuit Board................11 7. Exploded View & Mechanical Parts List..........13 8. Electrical Parts List................15...

  • Page 3: Introduction

    1. Introduction ˙ 1.5U 1/2 rack, multi-channel high power amplifier. ˙ Fantastic audio quality even with extremely high volume levels. ˙ Solid and durable, can be mounted into a cabinet. ˙ User-controllable clip limiter. ˙ 4×120Watts on 4 ohms (EIAJ) ˙...

  • Page 4: Specification

    2. Specification MODEL A400.4 DRAGONFLY 20Hz 20KHz@0.1%THD, Stereo Mode 8 ohms per channel(EIAJ) 4 ohms per channel(EIAJ) 120W 4 ohms per channel(RMS) 62W+3W (at THD:1%) +3dBu Input Sensitivity @4 ohms FRONT: Power switch, LEVEL knobs Controls REAR: Four LIMITER Switches for channel 1- channel 4...

  • Page 5: Block Diagram

    3. Block Diagram - 3 -...

  • Page 6: Schematic Diagram

    4. Schematic Diagram - 4 -...
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  • Page 11 - 9 -...

  • Page 12: Wiring Diagram

    5. Wiring Diagram - 10 -...

  • Page 13: Printed Circuit Board

    6. Printed Circuit Board - 11 -...
  • Page 14 PCB:A4-400FP BOTTOM LAYER BOTTOM OVERLAY BOTTOM SOLDER PCB:A4-400IO BOTTOM LAYER BOTTOM SOLDER PCB:A4-400FP TOP LAYER TOP OVERLAY TOP SOLDER PCB:A4-400IO TOP LAYER TOP OVERLAY TOP SOLDER PCB:A4-400LED BOTTOM LAYER BOTTOM SOLDER PCB:A4-400LED TOP OVERLAY PCB:PM8PWR BOTTOM LAYER BOTTOM OVETLAY BOTTOM SOLDER PCB:PM8PWR TOP LAYER TOP OVETLAY TOP SOLDER - 12 -...

  • Page 15: Exploded View & Mechanical Parts List

    7. Exploded View - 13 -...
  • Page 16 - 14 -...

  • Page 17: Electrical Parts List

    3 MA05583 panel 1.0t*12*63.6*205.5 A400.2_V1.5 4 ME00184 iron pillar A200.2 M3*11.2*0.5PH*φ5.8_V1.0 5 MJ00058 single light board 1*2135*1220 20.45kg 6 MI03126 front board A400.4 DRAGONFLY ALTO left_V1.0 7 MI02595 front board A1000.4 left 8 MI02596 front board A1000.4 left_V1.0 9 MI02959 front board 6*40*1M(1M/0.59kg) A500.2_V1.0...
  • Page 18 75 NI00498 self-adhere foot cushion 12.7*7*6mm(SF-005) 76 HJ00006 dessicant 77 NA00123 PE bag 0.04t*580*300mm 78 NE11347 label ALTO PI 79 NH00334 cone paper 0.040*1m 80 NF00061 assurance card ALTO 81 NA00279 clip-chain bag 0.04t*100*150mm_V1.0 82 AD00012 twin adhesive 90*120mm_V1.0...
  • Page 19 No. Part No. Description Specification Remark 85 HC00077 connector(male) 3P 2.5mm 180° CN5,CN6,CN7,CN8 86 HC00078 connector(male) 4P 2.5mm 180° CN9,CN10 87 HC00391 balance MIC jack CXLF-07L(PUSH)/(BELTON) CN1,CN2,CN3,CN4 88 HI00162 push-button switch 2 paragraphs 6p PS-22E8552L SW1,SW2,SW3,SW4 89 CA00024 ceramic capacitor 100PF SL ,C2,C3,C4,C5,C6,C7,C8,C9,C10,C11,C12 90 HC00371 MIC jack...
  • Page 20 133 HB01807 A4-400FP_VER050406 134 CB00056 electrolytic capacitor 220uF/25V φ8*11mm C42,C43 135 HK05802 PC board P-PM8PWR-DIP(A400.4) 100uF/25V 105℃ SH φ6*11mm C26,C30,C6 136 CB00130 electrolytic capacitor 180uF/25V 105℃ WL φ8*11mm C9,C47 137 CB00131 electrolytic capacitor 330uF/25V 105℃ LZ φ8*15mm C4 138 CB00132 electrolytic capacitor 470uF/200V 85℃...
  • Page 21 No. Part No. Description Specification Remark 168 SB00109 transistor BC640 169 SD00066 integrated circuit L7812CV(TO-220)(ST) 170 TC00118 transformer PE-67100 171 TC00203 transformer 4022-369-7449.2 172 TC00202 transformer 27-12-648 173 TC00168 transformer 27-12-648 OP62/100℃/145mm 174 HI00176 thermal switch 175 RA00701 fixed resistor 1/4W 2.2KΩ...
  • Page 22 M705E Sn 3Ag-0.5Cu 243 MK00122 spring piece 1.2t*17*16*21(ML000007)_V1.1 D1,M2 244 SB00110 transistor STW9NB80 245 NC00852 mica-RS 25*40mm 246 HK05978 PC board P-D100W-2-DIP(A400.4) 247 CB00021 electrolytic capacitor 10uF/16V φ4*5mm C20,C22,C14,C15 248 CB00162 electrolytic capacitor 100uF/35V 105°C TL φ8*11mm C105,C106 249 CB00164 electrolytic capacitor C23,C24 2200uF/35V 105°C TL φ16*32mm...
  • Page 23 1/4W 100Ω M type R63,R64 288 RA00173 fixed resistor 1/4W 47Ω F type R65,R66,R68,R70 289 HC00077 connector(male) 3P 2.5mm 180° 290 NF02317 user manual A400.4 ALTO_V1.1 291 NH00149 paper 889*640mm 292 NB04286 gift carton A400.4 ALTO_V1.1 - 21 -...
  • Page 24 311 HA03501 single terminal wiring 300mm UL1015 18AWG red 312 HA02911 wire 3P-3P 200mm UL2547 28AWG brown 313 HA00370 wire 80mm black L5R5 314 HA03724 wire 90mm UL1015 18AWG 315 NB04632 cushion A400.4_V1.0 316 NB04631 carton A400.4 ALTO_V1.0 - 22 -...