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Alto SR400A Service Manual

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Service Manual
Model: SR400A
ALTO
REV.2

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Summary of Contents for Alto SR400A

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

    SPECIFICATIONS Test Result Model No: SR400A Test Date: 20040916 Tester: MO GUO ZHU Test Item Test Conditions Spec Test Result Remark Power Source AC: 230V；50 Hz Idle Current AC 230 V No-Load 5 ± 0.5 across R13 &R15 Power Rated Output.
  • Page 4 SPECIFICATIONS Test Result Model No：SR400A Test Date: Tester：MO GUO ZHU Test Item 1. Input 2. Signal/Noise 3. Distortion at 4. Distortion at 5. Frequency Sensitivity Rated Response Test Conditions FLAT Rated FLAT Rated FLAT Output FLAT Rated FLAT Output at...
  • Page 5 02-1...
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  • Page 7 03-2...
  • Page 8 330E TR23 BC847 8.6V LOW OUT+ 0.1U LOW SPEAKER OZ-SS-124LM1 DC 24V 16A TR25 TR24 -15V 1000U/6V3 BC857 BC847 OFFSET PROTECTION Title SR400A Size: Number Revision P-313120-1-SR400A VER1.0 Date: 2004/08/27 Sheet of: File: SR300A Drawn By: MO GUO ZHU 03-3...
  • Page 9 04-1...
  • Page 10 TOPLAYER&TOPOVERLAY BOTTOMLAYER 04-2...
  • Page 11 04-4...
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  • Page 13 Instruments required: 5) Resistive load 4 Ω 800W, 1) Sinusoidal signal generator, 6) Resistive load 8 Ω 300W 2) Dual trace scope, with probe, 3) Digital multimeter, 7) Pink noise from the GM “AUDIO CD”. 4) Variac 0-250 Vac, P.S: Isolate the oscilloscope from earth and adjust the two traces on center of screen in GND position.

  • Page 14: Testing Procedure

    TESTING PROCEDURE - Switch ON the LOW amplifier output to 4Ω load resistor and repeat the above booster check verifying more or less the same ± VCC1 conditions and verify that the signal must be symmetrical refer to GND, without detectable distortion and oscillation. Increase the VOLUME pot.
  • Page 15 05-3...
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  • Page 21: Mechanical Part List

    SR 400A 12 inch PLYWOOD black paint MI01870 ZE-fixed rack-nickel plated SR 400A MG00351 black screw-pill M4*16 HK04468 K-front panel combination SR 400A-ALTO-230V ND00367 EV sponge-one side adhesive 2.0t*100*18mmdark black_V1.0 HK01410 K-speaker -bass 12 inch ND00368 EV sponge-one side adhesive 2.0t*378*18mm dark black_V1.0...
  • Page 22 1.2t*607*392mm_V1.1 ├0003--------------------------------- MG00511 screw M4*37_V1.0 ├0004--------------------------------- NI02923 high pitch horn 280*206.5*17mm black ├0005--------------------------------- MG00350 screw M5*30 ├0006--------------------------------- NI03153 horn SR400A black_V1.0 ├0007--------------------------------- ND00231 sponge 15*50*50mm ├0008--------------------------------- MG00495 screw M6*13*1.0PH ├0009--------------------------------- NI02924 fixed bracket 84.9*114.3*15mm black ├0010--------------------------------- HG00082 speaker PA-DE34 Zn P-AUDIO 8Ω...
  • Page 23 MI00316 connect terminal PFM-15SA ││ │└0001------------------------- MJ00747 single light board 0.8t*21.6mm*100M 22.5kg ││ │ └0001------------------------ ME00106 iron pillar M3*24*0.5PH_V1.1 ││ └0003--------------------------- │├0002------------------------------- MI01679 heat-sink 4.5*40*162mm │├0003------------------------------- TD00343 transformer PT-4HA_230V │├0004------------------------------- HI00022 power switch-RS 4p black frame red key │├0005------------------------------- HC00005 AC socket-RS AC-008 │├0006-------------------------------...
  • Page 24 │││├0016--------------------------- CI00090 SMD ceramic capacitor 0603 0.0047uF/50V X7R ± 10% 1 C31 SE00011 SMD rectifier diode RLS4148 0.5A (LL-34) 5 D1,D8,D9,D26,D27 │││├0017--------------------------- SF00031 SMD transistor BC847B(SOT-23)/(PHI) 3 TR22,TR23,TR24 │││├0018--------------------------- SF00032 SMD transistor BC857B(SOT-23)/(PHI) 4 TR16,TR17,TR18,TR25 │││├0019--------------------------- SG00040 SMD integrated circuit MC33078DT(ST)MC33078D(ON) 2 IC5,IC6 │││├0020---------------------------...
  • Page 25 φ21*16mm │└0050------------------------------- HK05846 PC board P-313115-3-DIP-SR400A+ │ ├0001------------------------------ SC00319 crystal oscillator 12.288MHZ 1 XT1 │ ├0002------------------------------ NE16149 lable SR400A+ CS:7EFA_V1.0 │ │├0001---------------------------- NI00034 membrane 0.045*1M NH00014 bond paper 0.05*1M white │ │└0002---------------------------- │ ├0003------------------------------ HC00145 connector 2.54 90° 2P(gold-plated) 6/14mm 1.2mm...
  • Page 26 NB03185 SR400;400A ALTO_V1.3 ├0031--------------------------------- NE04372 label │├0001------------------------------- NI02598 membrane 125mm │└0002------------------------------- NH00252 paper 130mm ├0032--------------------------------- NE12805 label SR400A ALTO_V1.0 │├0001------------------------------- NI00057 adhesive label 0.11*1M │└0002------------------------------- NI00027 membrane 0.105*1M ├0033--------------------------------- NA00433 silk wadding-RS SR 400A down_V1.0 ├0034--------------------------------- NA00432 silk wadding-RS SR 400A up_V1.0 ├0035---------------------------------...