Alto_aVerb_FX_Service_Manual电路图.pdf

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1、Service Manual Version: 1.1 Model: VERB 24x32 BIT DIGITAL EFFECTS RadioFans.CN 收音机爱 好者资料库 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 RadioFans

2、.CN 收音机爱 好者资料库 1. SPECIFICATION (aVERB) Electrical Frequency Response: +0.5 / -1.5 dB from 20Hz to 20 kHz S/N Ratio (process) 80 dB A wtg, 20 Hz-22kHz S/N Ratio (bypass) 90 dB A wtg, 20 Hz-22kHz THD+Noise: 500 Kohms A/D - D/A Conversions A/D converter: 1 bit Sigma-Delta D/A converter: 1 bit Sigma-De

3、lta Output Number of Channels:2 Format:1/4 unbalanced Maximum Level (bypass): +9 dBu Output Impedance: LEFT input of the device under test. -LEFT output of the device under test - A input of Audio Precision System Two -RIGHT output of the device under test - B input of Audio Precision System Two On

4、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.

5、Audio Precision05/22/02 12:55:43 alfaverb_amplitude.at2c ColorLine StyleThickDataAxis CyanSolid1Anlr.Level ALeft GreenSolid1Anlr.Level BRight -10 +10 -7.5 -5 -2.5 +0 +2.5 +5 +7.5 d B V -10 +10 -7.5 -5 -2.5 +0 +2.5 +5 +7.5 d B V 2020k501002005001k2k5k10k Hz THD test On PC: -Load file: alfaverb_THD (A

6、PWin File menu / Open / Test ) Test Connections: -Output A of Audio Precision System Two - LEFT input of the device under test. 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) a

7、nd 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 Preci

8、sion05/22/02 13:06:12 alfaverb_THD.at2c ColorLine StyleThickDataAxis CyanSolid2Anlr.THD+N RatioLeft 0.1 1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 % 206k501002005001k2k Hz S/N test On PC: -Load file: alfaverb_SN (APWin File menu / Open / Test ) Test Connections: -Output A of Audio Precision System Two - LEFT

9、 input of the device under test. On the Alphaverb: -Turn on the power switch. -Set OUTPUT volume to maximum. - With MIX command turned to 10, increase the INPUT level until the devices outputs clip, and after reduce the INPUT level itself until the outputs exit from clipping state. -Set PROGRAM to D

10、ELAY. -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

11、 Two / MIX potentiometer turned to 10 Audio Precision05/22/02 13:13:22 alfaverb_SN.at2c ColorLine StyleThickDataAxis CyanSolid2Anlr.AmplLeft -100 +20 -80 -60 -40 -20 +0 d B V -1000.000+0-900-800-700-600-500-400-300-200-100 dBV Dynamics test On PC: -Load file: alfaverb_dyn (APWin File menu / Open / T

12、est ) Test Connections: -Output A of Audio Precision System Two - LEFT input of the device under test. 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 (P

13、age3 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 Precision05/22/02 13:16:14 alf

14、averb_dyn.at2c ColorLine StyleThickDataAxis CyanSolid1Anlr.THD+N RatioLeft GreenSolid1Anlr.Level ARight -6 +12 -4 -2 +0 +2 +4 +6 +8 +10 d B u -0 20 2 4 6 8 10 12 14 16 18 % -26-14-24-22-20-18-16 dBu Stability test On PC: -Load file: alfaverb_stability (APWin File menu / Open / Test ) Test Connection

15、s: -Output A of Audio Precision System Two - LEFT input of the device under test. -LEFT output of the device under test - A input of Audio Precision System Two -RIGHT output of the device under test - B input of Audio Precision System Two On the Alphaverb: -Turn on the power switch. -Set OUTPUT volu

16、me 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 s

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