Alto Verb, Service Manual

Page 1: ...Service Manual www altoproaudio com Version 1 1 Model αVERB 24x32 BIT DIGITAL EFFECTS ...

Page 2: ...CONTENTS 1 Specification 2 Block Diagram 3 Schematic Diagram 4 Printed Circuit Board 5 Wiring Diagram 6 Test Procedure 7 Electrical Parts List 8 Exploded Views Mechanical Parts List 9 Notes ...

Page 3: ... 9 dBu Output Impedance 500 ohms Front Panel Controls Input Output Levels ANALOG PROGRAM selections 2 knobs Indicators Power Signal clip LED Rear Panel IN OUT levels ANALOG 1 4 2 conductor mono Output LEFT RIGHT 1 4 2 conductor mono BYPASS 1 4 2 conductor auto sense pedal type for momentary footswitches Power 9 Volt AC Power Transformer Processing and Memory Processor Speed 12 MIPs million instruc...

Page 4: ...RAM ENCODER A SO0 SI0 OUTPUT R OUTPUT L FOOT SWITCH INPUT R INPUT L PJ1 PJ2 PJ5 PJ3 PJ4 VARIATIONS ENCODER B STEREO AUDIO CODEC U6 PCM3001E A D and D A CONVERTER Q1 11 0592MHZ CLOCK DIVIDE U7 74HC393 11 0592MHZ FOOTSWITCH CONTROL MONO INPUT INPUT BUFFER AMPLIFIER IN R IN L OUT R OUT L INPUT LEVEL INPUT LEVEL OUTPUT AMPLIFIER OUTPUT LEVEL OUTPUT LEVEL MIX CONTROL LRCKIN 43 20KHZ BCK 1 382MHZ ...

Page 5: ... 12 5V 13 A4 14 A5 15 A6 16 A7 17 A8 18 OE 22 CAS 23 I 02 24 I 03 25 DGND 26 U10 GM71C4256BJ60 5 6 U11C 74HC04D 8 9 U11D 74HC04D 10 11 U11E 74HC04D 12 13 U11F 74HC04D DGND JP2 2P 2 5 D4 1N4148 R24 100K C27 47uF 25V DGND C39 100nF C40 100nF C41 100nF R25 4K7 R26 4K7 R27 4K7 R28 4K7 DGND 1 2 U11A 74HC04D CLK 1 Q0 3 Q1 4 Q2 5 Q3 6 MR 2 U6A 74HC393D CLK 13 Q0 11 Q1 10 Q2 9 Q3 8 MR 12 U6B 74HC393D DGND...

Page 6: ...16V L2 LF22uH L3 330uH 5V SGND SGND SGND SGND SGND SGND SGND SGND SGND D2 IN4002 D3 IN4002 AC 9V INPUT C9 220P AGND C14 10nF 5V 2 1 3 22 11 33 PJ2 LJB0661 6 L5 LF22uH VR1B A10K C16 47uF 25V AGND AGND2 5 6 7 U1B TL074CD C15 47uF 25V R15 1K C17 47uF 25V INPUTL 10 9 8 U1C TL074CD R14 2K2 R12 1K AGND 12 13 14 U4D TL074CD R13 1M OUTPUTL VR2B B1K VR3B A10K AGND R23 270R 5 6 7 U4B TL074CD R19 4K7 C24 680...

Page 7: ...BOTTOM SOLDER MASK BOTTOM LAYER ...

Page 8: ...TOP SILKSCREEN BOTTOM SILKSCREEN ...

Page 9: ...Tool Hole Size Hole Count Plated T1 31mil 0 80mm 203 T2 39mil 1 00mm 13 T3 47mil 1 20mm 42 T4 59mil 1 50mm 30 T5 98mil 2 50mm 1 T6 118mil 3 00mm 3 T7 138mil 3 50mm 2 Totals 294 DRILL DRAWING ...

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Page 12: ...quired Equipment Audio Precision System 2 with APWin software 100 Mhz oscilloscope connected to APS2 Analyzer Signal Monitor outputs Ch A and Ch B Connection Mode Use Audio Precision System 2 analog unbalanced BNC inputs outputs ...

Page 13: ...tem Two On the Alphaverb Turn on the power switch Set INPUT volume to maximum Set OUTPUT volume to maximum Set PROGRAM to DELAY Set VARIATION to 1 Start the sweep F9 and control the results Page3 Graph in the following conditions MIX potentiometer turned to 0 MIX potentiometer turned to 10 Audio Precision 05 22 02 12 55 43 alfaverb_amplitude at2c Color Line Style Thick Data Axis Cyan Solid 1 Anlr ...

Page 14: ...N to 1 Start the sweep F9 and control the results Page3 Graph in the following conditions LEFT output of the device under test A input of Audio Precision System Two MIX potentiometer turned to 10 RIGHT output of the device under test B input of Audio Precision System Two MIX potentiometer turned to 10 Audio Precision 05 22 02 13 06 12 alfaverb_THD at2c Color Line Style Thick Data Axis Cyan Solid 2...

Page 15: ...he outputs exit from clipping state Set PROGRAM to DELAY Set VARIATION to 1 Start the sweep F9 and control the results Page3 Graph in the following conditions LEFT output of the device under test A input of Audio Precision System Two MIX potentiometer turned to 10 RIGHT output of the device under test B input of Audio Precision System Two MIX potentiometer turned to 10 Audio Precision 05 22 02 13 ...

Page 16: ...p F9 and control the results Page3 Graph in the following conditions LEFT output of the device under test A input of Audio Precision System Two MIX potentiometer turned to 10 RIGHT output of the device under test B input of Audio Precision System Two MIX potentiometer turned to 10 Audio Precision 05 22 02 13 16 14 alfaverb_dyn at2c Color Line Style Thick Data Axis Cyan Solid 1 Anlr THD N Ratio Lef...

Page 17: ... under test B input of Audio Precision System Two On the Alphaverb Turn on the power switch Set OUTPUT volume to maximum Set INPUT volume to zero Set PROGRAM to DELAY Set MIX potentiometer to 0 Set VARIATION to 1 Test Move the input level knob from 0 to maximum 3 times and control the output waveforms NO PERMANENT SINE WAVEFORMS should be visible IF PERMANENT WAVEFORMS WITH FREQUENCY 20 kHz should...

Page 18: ...Structure Needing Material Detail List Midprod NO NO Quanity Unit ޙ ᑫ 3113014016 3113016014 ϒ Qbhf 2 pg 2 311306028 B bWFSC BMUP 341W ለ 2 2 111 QDT B bWFSC ڕޢغ Ъ 3 2 111 QDT Q bWFSC TNE 4 2 111 QDT Q bWFSC EJQ 5 2 111 QDT ...

Page 19: ...dl qmbufe tdsfx 22 NTDC49 MARK QDT 5 111 4 8 xbtifs 23 OD11242 MARK QDT 6 111 2 ɫ22 4 ɫ26 4 sfe ovu pg qmbtujd 24 IDTN48 3 MARK QDT 6 111 ɫ8027 H31026 5 9 ifybh xbtifs 25 NGT127 MARK QDT 3 111 ɫ4 ɫ7 6 1 6u spx xjsf dpoofdups xjsjo 26 IMTG237 MARK QDT 2 111 3Q 211n0n M F E 27 EM54SH MARK QDT 2 111 MH3154 hsffo tmffwjoh gmbnf sfubsebou 28 ONDU27XX1121 MARK QDT 3 111 3 6ɫ 21n0n wpmubhf usbotgpsnfs FJ...

Page 20: ...1 bWFSC BNQ Jufn Op tqfdjgz Item Name Specific NO Material No Voju Rvbojuz Qt qbqfs pvuufs dbtf 9ipmf 39 QPB113 MARK QDT 1 236 bWFSC gjyfe cpbse 3 NBQJ75 MARK QDT 2 111 243 31 6 bWFSC mbcfm 41 ONMN483 MARK 5 111 bWFSC mbcfm 42 OF16115 MARK 5 111 BMUP mbcfm 43 ONMI42 MARK 3 111 NBEF JO Q S D ...

Page 21: ...P 341W ለ Nje Op B bWFSC ڕޢغ Ъ tuboebse rvboujuz 2 111 bWFSC BNQ Jufn Op tqfdjgz Item Name Specific NO Material No Voju Rvbojuz Qt cpuupn cpbse cmbdl 2 NCU 15 MARK QDT 2 111 bWFSC jspo qjmmbs 3 NND125 MARK QDT 3 111 ifybhpo 7 46 N4 3 ...

Page 22: ...41 TNE 2021X gjyfe sftjtups 22 SGDF621 MARK S QDT 3 111 2 1Nɖ Ų6 1916 24 6 TNE1916 dfsbnjd dbqbdjup 23 DDD133C MARK D QDT 3 111 33QG OQP 61W 43 44 TNE1916 dfsbnjd dbqbdjup 24 DDD158C MARK D QDT 5 111 58QG OQP 61W 57 58 59 5 TNE1916 dfsbnjd dbqbdjup 25 DDD193C MARK D QDT 2 111 93QG OQP 61W 56 TNE1916 dfsbnjd dbqbdjup 26 DDD233C MARK D QDT 3 111 331QG OQP 61WŲ6 36 TNE1916 dfsbnjd dbqbdjup 27 DDD258C...

Page 23: ...FSC BNQ Jufn Op tqfdjgz Item Name Specific NO Material No Voju Rvbojuz Qt TNE joufhsbufe djsdvju 37 ICF115 MARK V QDT 2 111 TFFE UNT68113EQIB 8 TNE joufhsbufe djsdvju 38 ICF116 MARK V QDT 3 111 TFFE NC92D5367B 71 21 TNE dijq joevdubodf 39 NDPT114 MARK M QDT 6 111 CMN32B213TQU 22 23 8 9 ...

Page 24: ...dvju 21 TJD825 MARK V QDT 2 111 8916 3 wpmubhf tubcjmj fe usbot 22 TUS818 MARK V QDT 2 111 8 M16 UP 3 4 rvbsu dsztubmmpje 22 16 23 TRS22 16 3 MARK R QDT 2 111 ID 5 0VT Ų31QQN 2 joevups 24 NDP15 MARK M QDT 2 111 441vI MHB1419 442L 4 FNJ GJMUFS gjmufs 25 DP1149 MARK M QDT 6 111 MG 33VI XBI UBZJ 2 3 5 6 7 xbwfcboe txjudi 26 ITXG2 MARK QDT 3 111 399T1232 FODB FODC cvuupo TX epvcmf mjol bd 27 ITXF26 MA...

Page 25: ... xjsf 38 NNDK1 MARK KQ QDT 5 111 21n0n 36 54 55 56 kvnqfs xjsf 39 NNDK23 MARK KQ QDT 9 111 23n0n 57 62 63 64 65 73 79 82 kvnqfs xjsf 3 NNDK25 MARK K QDT 2 111 26n0n 76 kvnqfs xjsf 41 NNDK26 MARK KQ QDT 22 111 27n0n 49 66 67 68 69 6 71 72 74 77 7 gjmufs FNJ GJUFS 42 NDPD35 MARK M QDT 2 111 QMU1 I 3114S 21 ifbu tjol 43 NIMU48 MARK QDT 2 111 36 26 21 7 2QJO TDM 3131 Oj tdsfx 44 NTDO27 MARK QDT 2 111 ...

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