Alto L-12 Service Manual
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Alto L-12 Service Manual

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Service
MODEL: L-12/16/20
www.altoproaudio.com
Version 2.0 Revised on Jan,2010

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Summary of Contents for Alto L-12

  • Page 1 Service MODEL: L-12/16/20 www.altoproaudio.com Version 2.0 Revised on Jan,2010...

  • Page 2: Table Of Contents

    CONTENTS 1. Introduction…………………………………………………………………………………….1 2. Specification…………………………………………………………………………………...2 3. Block Diagram………………………………………………………………………………...3 4. Schematic Diagram…………………………………………………………………………..4 5. Wiring Diagram……………………………………………………………………………..23 6. PCB Layout….……………………………………………………………………………….24 7. Test Procedure……………………………………………………………………………..33 8. Exploded View & Mechanical Parts List……………………………………………..36 9. BOM List…………………………………………………………………………………..39...

  • Page 3: Introduction

    1. Introduction ALTO L-12 (12 Channels)/L-16(16 Channels/L-20(20 Channels) features: CHANNEL STRIPS. AUX send 1/2 switch-able to PRE/POST fader 60 mm high precision faders Each input channel with Mute, SOLO function, low cut filters-75Hz, 18 dB/OCT and Overload & signal present LEDs.

  • Page 4: Specification

    2. Specification Microphone input electronically balanced, discrete input configuration Frequency response 10Hz to 55kHz, + /-3dB Distortion (THD & N) 0.005% at +4dBu, 1kHz Gain range 0dB to 60dB (MIC) Mono input channels SNR (Signal to Noise Ratio) 115dB Line input electronically balanced Frequency response 10Hz to 55kHz, +/-3dB...

  • Page 5: Block Diagram

    3. Block Diagram --- 3 ---...

  • Page 6: Schematic Diagram

    4. Schematic Diagram --- 4 ---...
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  • Page 25: Wiring Diagram

    5. Wiring Diagram MONO-LEVEL AUXSEND1 AUXSEND2 AUXSEND3 DFX SEND DFXOUT-L DFXOUT-R AUXRTN1-L AUXRTN1-R AUXRTN2-L AUXRTN2-R AUXRTN3-L AUXRTN3-R AUXRTN4-L AUXRTN4-R EFXRTN-L INS-CH9 EFXRTN-R INS-CH10 INS-CH11 INS-CH12 PHONE-R SUB1-L MONO-LEVEL PHONE-L SUB2-R AUXSEND1 MAIN-L-2 SUB3-L AUXSEND2 MAIN-R-2 SUB4-R AUXSEND3 2TKIN-L MAIN-L-2 DFX SEND 2TKIN-R MAIN-R-2 DFXOUT-L...

  • Page 26: Pcb Layout

    6. PCB Layout --- 24 ---...
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  • Page 35: Test Procedure

    7. Test Procedure Finished product test procedure 1. Instruments AP tester Double trace oscilloscope Voltmeter 2. Functions Test a. Input the proper AC power supply, turn on the main power, POWER LED will be illuminated (green). Then switch on PHANTOM power, PHANTOM LED will be illuminated (red), use a voltmeter to test the first pin and second pin of each MIC (MIC 1, MIC 2), the volt of phantom power should be 46V(±2V).
  • Page 36 (Remark: don’t need to test L6 with this step) b. Turn EQ HI &LOW knob to the MAX and the MIN (EQ MID at the middle), test the frequency response, the frequency response curve is shown as follows, please refer to the following figure. c.
  • Page 37 Remarks: the frequency response test of normal instruments: a. Turn EQ LOW knob of the relating channel clockwise to the max (+15), the output is +15dBu(± 2dB), then turn EQ LOW knob of the relating channel counter-clockwise to the min. (-15), the output is –15dBu(±...

  • Page 38: Exploded View & Mechanical Parts List

    8. Exploded View & Mechanical Parts List MODEL No: L-12 /16/20 --- 36 ---...
  • Page 39 Mechanical Parts List S/N Part No Description Specification MA03900 ZC-panel L-20 MB03632 ZC-chassis L-20 ALTO 127V_V1.0 MJ01159 ZB-side board L-20 right NI02638 ZC-Acrylic-transparent L-12 (3t*97.5*49mm) NI02640 ZC-Acrylic-transparent L-12 (3t*91.5*56mm) MJ01225 ZD-partition-L12-011 L-12 1.2t*100.5*74.5 NI02620 ZD-insulation board-L8-04 1*86.5*53 L-8 MI00584 Heat sink-AL type...
  • Page 40 S/N Part No Description Specification 40 MF00048 Washer 4* 8*0.5t 41 NC00151 NC00151 0.2t*116*22 L-12 42 MI01762 ZD-fixed bracket-L12-08 1.2t*112*12*5 L-12 43 ME00015 Colour screw 44 MG00170 Zn-screw-pill M3*14 45 HI00120 Slide SW L21-22A solder wiring 46 HC00008 AC inlet 3515 A TYPE(RF-2004-C-4.8)

  • Page 41: Bom List

    9. BOM List L-12 BOM List Class Part No Description Specification Insert location Remark PF01721 MIXING CONSOLE L-12-MK _ALTO_230V_CHINA MA03906 panel 0001 MB03650 rear board-RS-ACT 0002 L-12MK ALTO_V1.0 MJ01159 side cover board L20 right 0003 0004 NI02638 acrylic panel L-12 (3t*97.5*49mm)
  • Page 42 0052 NI00218 cable tie ALT-102SB 0053 NI02519 self-adhere foot cushion 15.9*8.0mm(RF-006) 0054 NF00061 assurance card-RS-C ALTO_V1.1 0055 NB02470 gift carton-RS L-12 ALTO_V1.0 0056 NB02467 carton-RS L-12 ALTO_V1.1 0057 NA00874 PE bag-RS 0.05t*610*500 mm 0058 NE05004 label ALTO PF_V1.2 0059 NE11466...
  • Page 43 Class Part No Description Specification Insert location Remark C24,C25,C26,C27,C28,C29,C30,C31,C32,C33,C3 4,C35,C63,C64,C65,C66,C67,C68,C69,C70,C71, 0003 CI00075 SMD ceramic capacitor 0603 0.1uF/50V Y5V +80,-20% C72,C73,C74,C75,C76,C77,C78,C79,C80,C81,C8 2,C83,C84,C85,C86,C87,C89,C90,C88 R70,R70-1,R71,R71- 0004 RD00101 SMD fixed resistor 1/10W 10K ±5% 0603 1,R76,R77,R78,R79,R80,R81,R82,R83,R84,R85, R86,R87,R92,R93,R94,R95 R26,R26-1,R26-2,R26-3,R27,R27-1,R27-2,R27- 0005 RD00214 SMD precise resistor 1/10W 10.0K ±1% 0603 3,R61,R61-1,R62,R62-1 C1,C1-1,C1-2,C1-3,C2,C2-1,C2-2,C2-3,C38,C38-...
  • Page 44 Class Part No Description Specification Insert location Remark SA00053 L.E.D 3 round(red)long foot 26mm LD2,LD2-1,LD2-2,LD2-3 0009 0010 SA00051 L.E.D 3 orange,green BOG303b LD3,LD3-1,LD3-2,LD3-3 NI01782 LED spacer support LEDS-11 11mm LD1,LD1-1,LD1-2,LD1-3,LD2,LD2-1,LD2-2,LD2-3 0011 0012 NI02588 LED spacer support LED3*11 11mm LD3,LD3-1,LD3-2,LD3-3 HA02446 wire-RS 14P(male)-14P(female) 60mm UL1007 28AWG CN1,CN2...
  • Page 45 Class Part No Description Specification Insert location Remark SW2,SW5,SW6,SW7,SW9,SW12,SW13,SW14,S W15,SW16,SW21,SW22,SW24,SW25,SW26,SW 0004 HI00236 push-button switch-RS 2 6P KFC-D85-C(SELF-LOCK) 32,SW33,SW34,SW35,SW36,SW37,SW38,SW3 9,SW43,SW44,SW45,SW46,SW48,SW49,SW50, SW51,SW1,SW8,SW23,SW40,SW41 0005 HI00238 push-button switch-RS 2 6P KFC-D85-D(NON-LOCK) SW47 SW4,SW11,SW19,SW20,SW27,SW28,SW29,S 0006 HI00237 push-button switch-RS 2 12P KFC-D130-B(SELF-LOCK) W30,SW31,SW42,SW3,SW10,SW17,SW18 HI00161 relay RY-5W-K,5V 0007 0008 HI00317...
  • Page 46 Class Part No Description Specification Insert location Remark 0036 RD00087 SMD fixed resistor 1/10W 2.0K ±5% 0603 R582,R609 0037 RD00088 SMD fixed resistor 1/10W 2.2K ±5% 0603 R67,R68,R233,R234,R375,R635 0038 RD00091 SMD fixed resistor 1/10W 3.3K ±5% 0603 R69,R70,R199,R200,R626,R627 0039 RD00352 SMD fixed resistor 1/10W 3.6K ±5% 0603 R329,R330,R335,R336,R338,R339...
  • Page 47 Class Part No Description Specification Insert location Remark C389,C390,C379,C421,C425,C426,C427,C428,C 429,C430,C431,C437,C446,C447,C448,C449,C45 0,C451,C452,C453,C49,C50,C51,C52,C53,C54,C 55,C56,C57,C58,C61,C62,C63,C64,C65,C66,C13 1,C132,C133,C134,C135,C136,C137,C138,C139, C140,C141,C142,C143,C144,C145,C146,C165,C 166,C167,C168,C169,C170,C171,C172,C221,C22 2,C223,C224,C225,C226,C227,C228,C229,C230, 0066 CI00075 SMD ceramic capacitor 0603 0.1uF/50V Y5V +80,-20% C231,C232,C233,C234,C235,C236,C325,C326,C 327,C328,C329,C330,C331,C332,C333,C334,C33 5,C336,C337,C338,C339,C340,C341,C342,C343, C344,C345,C346,C347,C348,C349,C350,C351,C 352,C353,C354,C355,C356,C357,C358,C359,C36 0,C361,C362,C363,C364,C365,C366,C367,C368, C369,C370,C371,C372,C399,C400,C403,C404,C 405,C406,C407,C408,C409,C410,C411,C412,C47 6,C477,C481,C482,C483,C484,C485,C478 0067 CI00063 SMD ceramic capacitor 0603 470PF/50V NPO ±5 C456,C459,C462,C465 0068 SF00038...
  • Page 48 AC00603 lead free soldering bar S100 0006 CB00166 electrolytic capacitor 100uF/16V 6*5mm C19,C12,C5,C2,C24,C16,C21,C25,C26,C28,C7 0007 MJ01235 side cover board L-12 left 0067 HA02453 wire-RS 20P-20P 40mm UL2651 28AWG PH1.27mm 0068 NE02717 label MADE IN CHINA 0069 NB02474 cushion L-12;16;20series right...
  • Page 49 HA01638 row-wire connector wiring-RS 2P 280mm UL1007 24AWG HA02454 wire-RS (20P-20P)*2 120/40mm UL2651 28AWG PH1.27 MN1 & MN2 connectors 0014 0015 NI02642 fixed plate L-12 (6.8*110*63.3 white) chassis of LED board 0016 NI02083 knob 10.5*18mm NI02081 knob 10.5*18mm 0017 0018...
  • Page 50 L-16 ALTO_V1.5 NB02050 gift carton-RS L-16 ALTO_V1.0 0058 0059 NB02468 carton-RS L-16_V1.2 0060 NA00875 PE bag-RS 0.05t*820*540mm_V1.0 NE05004 label ALTO PF_V1.2 0061 0062 NE11467 label L-16 ALTO 0063 HK03982 PC board P-L12PU1-DIP X1,X2,X3,X4,X5,X6,X7,X8,X9,X10,X11,X12,X13,X14,X1 0001 HC00125 MIC jack-RS JY-6351G-02-250 5,X16,X17,X18,X19,X20,X21,X22,X23,X24,X25,X26,X2...
  • Page 51 Class Part No Description Specification Insert location Remark C24,C25,C26,C27,C28,C29,C30,C31,C32,C33,C34,C3 5,C63,C64,C65,C66,C67,C68,C69,C70,C71,C72,C73,C 0003 CI00075 SMD ceramic capacitor 0603 0.1uF/50V Y5V +80,-20% 74,C75,C76,C77,C78,C79,C80,C81,C82,C83,C84,C85, C86,C87,C89,C90,C88 R70,R70-1,R71,R71- 0004 RD00101 SMD fixed resistor 1/10W 10K ±5% 0603 1,R76,R77,R78,R79,R80,R81,R82,R83,R84,R85,R86,R 87,R92,R93,R94,R95 R26,R26-1,R26-2,R26-3,R27,R27-1,R27-2, 0005 RD00214 SMD precise resistor 1/10W 10.0K ±1% 0603 R27-3,R61,R61-1,R62,R62-1 C1,C1-1,C1-2,C1-3,C2,C2-1,C2-2,C2-3,C38,...
  • Page 52 Class Part No Description Specification Insert location Remark 0017 HK10001 PC board P-L12_MN2-AI CF00143 metal-film capacitor MSC 0.0015uF/100V 5% CASE01 C10,C10-1,C10-2,C10-3 0001 C7,C7-1,C7-2,C7-3,C8,C8-1,C8-2,C8-3, CF00141 metal-film capacitor MSC 0.0068uF/100V 5% CASE01 0002 C1,C1-1,C1-2,C1-3 CF00137 metal-film capacitor MSC 0.033uF/63V 5% CASE01 C11,C11-1,C11-2,C11-3,C12,C12-1,C12-2,C12-3 0003 0004 CB00412...
  • Page 53 Class Part No Description Specification Insert location Remark 0016 SA00054 L.E.D 3m/m round(yellow)long foot 26 LD1,LD2,LD5,LD6,LD22,LD34 LD12,LD13,LD14,LD15,LD16,LD17,LD18,LD19,LD20,L SA00052 L.E.D 3 round(green)long foot 26 D21,LD24,LD25,LD26,LD27,LD28,LD29,LD30,LD31,LD 0017 32,LD33,LD36,LD10 0018 NI01782 LED spacer support LEDS-11 11mm 1. all LEDS of 2PIN HC00499 connector 2.54 180°2*8P(gold-plated) 6/11.6mm 0019 0020...
  • Page 54 Class Part No Description Specification Insert location Remark R21,R24,R25,R27,R28,R29,R32,R33,R153,R155,R156 ,R158,R160,R161,R164,R165,R203,R204,R215,R270, R272,R274,R276,R293,R294,R299,R300,R301,R302,R 309,R316,R317,R382,R383,R390,R397,R411,R424,R4 25,R426,R427,R430,R431,R434,R435,R436,R437,R43 8,R442,R443,R444,R445,R446,R447,R450,R451,R452 ,R453,R454,R455,R456,R457,R461,R465,R469,R473, R477,R481,R485,R489,R493,R497,R501,R509,R513,R RD00101 SMD fixed resistor 1/10W 10K ±5% 0603 517,R521,R525,R529,R530,R540,R549,R553,R569,R5 0047 77,R581,R588,R591,R594,R628,R629,R630,R631,R63 2,R633,R634,R637,R638,R640,R641,R642,R643,R644 ,R645,R655,R656,R680,R681,R691,R692,R693,R702, R703,R704,R713,R714,R715,R729,R730,R731,R741,R 742,R743,R744,R439,R505,R541,R573,R636,R682,R7 32,R310,R311,R321,R376,R377,R216,R404,R157,R16 6,R205,R206,R207,R208,R220,R221,R222,R223,R677 ,R688,R340,R342,R428,R429 R59,R60,R61,R62,R73,R74,R75,R76,R77,R78,R84,R8 6,R87,R91,R92,R93,R95,R96,R97,R98,R191,R192,R1 0048 RD00102 SMD fixed resistor 1/10W 12K ±5% 0603 93,R194,R225,R226,R227,R228,R546,R547,R548,R55 0,R551,R552,R556,R557...
  • Page 55 HB00975 L12LED(1*30)_VRE030711 0002 SE00004 SMD L.E.D yellow 67-21UYC/S530-A2/TR8 1210 LED1,LED2,LED3,LED4,LED5 AE00553 SenJu solder paste M705-GRN360-K2-V 0.5KG/bottle 0003 0068 HK01524 PC board P-313123-DIP(L-12) 0001 SC00004 crystal oscillator 16.00MHZ HC00499 connector 2.54 180°2*8P(gold-plated) 6/11.6mm 0002 0003 SG00193 SMD integrated circuit SST39VF010-70n/L-8 0004...
  • Page 56 120 ±5% 0805 R1,R2,R3,R4,R5,R6,R7,R8 0002 0003 AE00553 SenJu solder paste M705-GRN360-K2-V 0.5KG/bottle 0004 AC00603 lead free soldering bar S100 MJ01235 side cover board L-12 left 0071 0072 NE02717 label MADE IN CHINA 0073 MJ00808 fixed clip WL3-32T NC00080 washer 3.17* 8.2*1...
  • Page 57 M3*10 RCAsocket*1PCS, 0011 LEDboard*2PCS. 0012 HC00206 BNC jack WJ-7031(28*12.7) HA02455 wire-RS 20P*4 120*2/40mm UL2651 28AWG PH1.27 0013 0014 NI02642 fixed plate L-12 (6.8*110*63.3 white) 1.LED board chassis 0015 NI02083 knob 10.5*18mm NI02081 knob 10.5*18mm 0016 0017 NI02082 knob 10.5*18mm 0018...
  • Page 58 L-20 ALTO_V1.4 NB02230 gift carton-RS L-20 ALTO_V1.0 0057 0058 NB02469 carton-RS L-20 ALTO_V1.3 0059 NA00875 PE bag-RS 0.05t*820*540mm_V1.0 NE05004 label ALTO PF_V1.2 0060 0061 NE11468 label L-20 ALTO 0062 HK03982 PC board P-L12PU1-DIP X1,X2,X3,X4,X5,X6,X7,X8,X9,X10,X11,X12,X13,X14,X1 0001 HC00125 MIC jack-RS JY-6351G-02-250 5,X16,X17,X18,X19,X20,X21,X22,X23,X24,X25,X26,X2...
  • Page 59 Class Part No Description Specification Insert location Remark C24,C25,C26,C27,C28,C29,C30,C31,C32,C33,C34,C3 5,C63,C64,C65,C66,C67,C68,C69,C70,C71,C72,C73,C 0003 CI00075 SMD ceramic capacitor 0603 0.1uF/50V Y5V +80,-20% 74,C75,C76,C77,C78,C79,C80,C81,C82,C83,C84,C85, C86,C87,C89,C90,C88 R70,R70-1,R71,R71- 0004 RD00101 SMD fixed resistor 1/10W 10K ±5% 0603 1,R76,R77,R78,R79,R80,R81,R82,R83,R84,R85,R86,R 87,R92,R93,R94,R95 R26,R26-1,R26-2,R26-3,R27,R27-1, 0005 RD00214 SMD precise resistor 1/10W 10.0K ±1% 0603 R27-2,R27-3,R61,R61-1,R62,R62-1 C1,C1-1,C1-2,C1-3,C2,C2-1,C2-2,C2-3,...
  • Page 60 Class Part No Description Specification Insert location Remark C7,C7-1,C7-2,C7-3,C8,C8-1,C8-2,C8-3, CF00141 metal-film capacitor MSC 0.0068uF/100V 5% CASE01 0002 C1,C1-1,C1-2,C1-3 CF00137 metal-film capacitor MSC 0.033uF/63V 5% CASE01 C11,C11-1,C11-2,C11-3,C12,C12-1,C12-2,C12-3 0003 0004 CB00412 electrolytic capacitor-RS 1.0uF/50V 105 4*7mm C21,C21-1,C21-2,C21-3,C22,C22-1,C22-2,C22-3 C2,C2-1,C2-2,C2-3,C3,C3-1,C3-2,C3-3,C4,C4-1,C4- 0005 CB00194 electrolytic capacitor 47uF/25V 5*11mm 2,C4-3,C28,C28-1,C28-2,C28-3,C24,C25,C26,C27 0006...
  • Page 61 Class Part No Description Specification Insert location Remark LD12,LD13,LD14,LD15,LD16,LD17,LD18,LD19,LD20,L 0017 SA00052 L.E.D 3 round(green)long foot 26 D21,LD24,LD25,LD26,LD27,LD28,LD29,LD30,LD31,LD 32,LD33,LD36,LD10 0018 NI01782 LED spacer support LEDS-11 11mm 1.all LEDS of 2PIN 0019 HC00499 connector 2.54 180°2*8P(gold-plated) 6/11.6mm HC00072 row-wire header connector(male) 0020 0021 HA02446 wire-RS...
  • Page 62 Class Part No Description Specification Insert location Remark R21,R24,R25,R27,R28,R29,R32,R33,R153,R155,R156 ,R158,R160,R161,R164,R165,R203,R204,R215,R270, R272,R274,R276,R293,R294,R299,R300,R301,R302,R 309,R316,R317,R382,R383,R390,R397,R411,R424,R4 25,R426,R427,R430,R431,R434,R435,R436,R437,R43 8,R442,R443,R444,R445,R446,R447,R450,R451,R452 ,R453,R454,R455,R456,R457,R461,R465,R469,R473, R477,R481,R485,R489,R493,R497,R501,R509,R513,R RD00101 SMD fixed resistor 1/10W 10K ±5% 0603 517,R521,R525,R529,R530,R540,R549,R553,R569,R5 0047 77,R581,R588,R591,R594,R628,R629,R630,R631,R63 2,R633,R634,R637,R638,R640,R641,R642,R643,R644 ,R645,R655,R656,R680,R681,R691,R692,R693,R702, R703,R704,R713,R714,R715,R729,R730,R731,R741,R 742,R743,R744,R439,R505,R541,R573,R636,R682,R7 32,R310,R311,R321,R376,R377,R216,R404,R157,R16 6,R205,R206,R207,R208,R220,R221,R222,R223,R677 ,R688,R340,R342,R428,R429 R59,R60,R61,R62,R73,R74,R75,R76,R77,R78,R84,R8 6,R87,R91,R92,R93,R95,R96,R97,R98,R191,R192,R1 0048 RD00102 SMD fixed resistor 1/10W 12K ±5% 0603 93,R194,R225,R226,R227,R228,R546,R547,R548,R55 0,R551,R552,R556,R557...
  • Page 63 HB00975 L12LED(1*30)_VRE030711 0001 0002 SE00004 SMD L.E.D yellow 67-21UYC/S530-A2/TR8 1210 LED1,LED2,LED3,LED4,LED5 0003 AE00553 SenJu solder paste M705-GRN360-K2-V 0.5KG/bottle HK01524 PC board P-313123-DIP(L-12) 0067 0001 SC00004 crystal oscillator 16.00MHZ 0002 HC00499 connector 2.54 180°2*8P(gold-plated) 6/11.6mm SG00193 SMD integrated circuit SST39VF010-70n/L-8 0003...
  • Page 64 120 ±5% 0805 R1,R2,R3,R4,R5,R6,R7,R8 0002 0003 AE00553 SenJu solder paste M705-GRN360-K2-V 0.5KG/bottle 0004 AC00603 lead free soldering bar S100 MJ01235 side cover board L-12 left 0070 0071 NE02717 label MADE IN CHINA 0072 MJ00808 fixed clip WL3-32T NC00080 washer 3.17* 8.2*1...

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