Alesis-Micron-key-sch 电路图 维修手册.pdf

Specifications Sound Engine Sound Generation: Alesis proprietary DSP Analog Modeling Polyphonic Voices: 8, each with 3 oscillators, 2 multi-mode filters, 3 envelope generators, 2 LFOs, programmable effects send and modulation matrix. Program Memory: 512 Preset Programs, 32 Multi-timbral Setups, all user-rewritable Effects: 4 Drive Effects (1 each per Part) plus Master Effects (Shared) Audio Input Input Connectors: 2 Balanced 1/4” TRS jacks Maximum Input Level: +5.2dBu (1.41VRMS) = -0dBFS Input Impedance: 10k Audio Output Output Connectors: 4 Impedance-Balanced 1/4” TRS jacks, ” TRS Headphone Jack Maximum Output Level: +18dBu (6.17 VRMS) = -0dBFS Output Impedance: 1k Audio Performance Signal To Noise Ratio: 95 dB A-weighted, Ext In to Main or Aux Out THD+N: out”. Release the buttons. 2) Connect the AP generator output to the Q02 audio input left. 3) Set the AP generator output to produce a 2Vp, 1KHz sinewave and turn on the output. 4) Verify that there is a sound from the left side of the headphones 5) Connect the AP generator output to the Q02 audio input right and verify that there is a sound from the right side of the headphones. AP Test 1) Unplug the headphones from the Q02 headphones jack. 2) Turn the Master Volume knob completely clockwise. 3) Connect the AP generator outputs A and B to the Q02 audio in left and right, respectively. 4) Connect the Q02 main output left and right to the AP analyzer inputs A and B, respectively. 5) Run the AP tests (SNR, THD+N, and frequency response). 6) Hold down the phrase and latch buttons together. Verify that the second line of the LCD says “Synth - audio out”. Release the buttons. Automated Tests The system will provide a series of tests must be passed. Before beginning, verify that the sustain pedal is plugged into the “sustain” input jack. PUSH THE ENCODER TO BEGIN AUTOMATED TESTS. Each test is described below. The title of each section should appear on the first line of the LCD. Push all buttons. 1) Verify that the first line of the LCD says “Push all buttons”. 2) There are 7 rectangular buttons to the left of the LCD. Push each one. Verify that the button lights red when it is pushed, and stays red for the remainder of the test. 3) There are 5 round buttons to the right of the LCD. Push each one. Verify that the button lights green when it is pushed, and lights red when it is released. When a different round button is pushed, the light should turn off. There should never be more than one round button lit. 4) When any button is pressed down, verify that the name of that button is displayed on the LCD, and that the LCD indicates the button is pressed down with the text “button down.” 5) When any button is released, verify that the LCD indicates the button has been released with the text “button up.” 6) As each button is pressed, make sure that the silk screen on that button is not scratched or misaligned. Also verify that all the buttons have a consistent feel, and that they generate one “click” when pressed. 7) When all 12 buttons have been pushed, you will automatically go to the next test. Press all keys. 1) Verify that the first line of the LCD says “Press all keys”. 2) When a key pressed, verify that the LCD says “Key ## down”, where ## is the key number. The leftmost key is number 0, and the rightmost key is number 36. 3) When a key is released, verify that the LCD says “Key ## up”, where ## is the same key number. 4) As each key is pressed, make sure that the key movement and feel is consistent with all the other keys. Inspect the keys as well for scratches and dents. 5) When all 37 keys have been pressed, you will automatically go to the next test. Turn p wheel -- 1) Verify that the first line of the LCD says “Turn p wheel --”. 2) Turn the pitch wheel completely to the right. Turn p wheel <-- 1) Verify that the first line of the LCD says “Turn p wheel 1) Verify that the first line of the LCD says “Slide m1 --”. 2) Slide the m1 slider completely to the right. Slide m1 <-- 1) Verify that the first line of the LCD says “Slide m1 1) Verify that the first line of the LCD says “Slide m2 --”. 2) Slide the m2 slider completely to the right. Slide m2 <-- 1) Verify that the first line of the LCD says “Slide m2 1) Verify that the first line of the LCD says “Turn knob x --”. 2) Turn knob x to the right until the number passes 1500. 3) Verify that the turning is smooth. If the number jumps around, the unit does not pass. 4) Also verify that there are no bumps or rough spots felt on the pot knob as it is turned. Turn knob x <-- 1) Verify that the first line of the LCD says “Turn knob x 1) Verify that the first line of the LCD says “Turn knob y --”. 2) Turn knob y to the right until the number passes 1500. 3) Verify smoothness as described above. Turn knob y <-- 1) Verify that the first line of the LCD says “Turn knob y 1) Verify that the first line of the LCD says “Turn knob z --”. 2) Turn knob z to the right until the number passes 1500. 3) Verify smoothness as described above. Turn knob z <-- 1) Verify that the first line of the LCD says “Turn knob z 1) Verify that the first line of the LCD says “Turn enc --”.. 2) Turn the encoder to the right until the number passes 200. Turn enc <-- 1) Verify that the first line of the LCD says “Turn enc <--”.. 2) Turn the encoder to the left until the number passes -200. Push sus pedal. 1) Verify that the first line of the LCD says “Push sus pedal”.. 2) Verify that the sustain pedal is plugged into the sustain jack, and push and release the sustain pedal. Push: MIDI loop. 1) Verify that the first line of the LCD says “Push: MIDI loop”. 2) Verify that the MIDI in jack is connected to the MIDI out jack with a MIDI cable. 3) Push the encoder to test the connection. Tests passed. 1) Verify that the first line of the LCD says “* Tests passed”. END OF QC TEST PROCEDURES Firmware Update To update firmware, power on the system while holding down the programs and setups buttons. Connect a PC to the MIDI in jack, and send a sysex file. Confidential Alesis Service Manual 8-31-0147-A ALESIS MICRON (Q02) SCHEMATIC AND PCB FILES Confidential Alesis Service Manual 8-31-0147-A ALESIS MICRON (Q02) ECN HISTORY