Ich setzte es in Verbindung mit meinem Vierspurkassettenrekorder bzw. Mein Exemplar eines Microverb II verrichtet nun seit ca. Schon das Drehen der Regler ist ein Genuss. Die Potis besitzen viele Rasterpositionen und drehen sich mit leichtem Widerstand ohne zu wackeln oder zu kratzen, sehr cool! Hergestellt wurde die Alesis Micro-Serie ab ca. Mitte der 80er Jahre.
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If you are not authorized, please contact Alesis and destroy all copies of this document. You may contact Alesis at servicemanuals alesis. Together with the User Reference Manual, this document provides a complete description of the functionality and serviceability of the Device. Any comments or suggestions you may have pertaining to the document are welcome and encouraged. Therefore, if you perform, or if the Manual is used to perform, any service or repairs on any Alesis product or part thereof, any and all warranties of Alesis as to that product and any service contract with Alesis for that product shall be voided and shall no longer apply for such product, even if your services or repairs were done in accordance with the Manual.
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Replace with only the same type or equivalent type recommended by the equipment manufacturer. Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by the manufacturer. Confidential Alesis Service Manual A Safety Instructions Carefully read the applicable items of the operating instructions and these safety suggestions before using this product.
Use extra care to follow the warnings written on the product itself and in the operating instructions. Keep the operating instructions and safety suggestions for reference in the future. Power Source. The product should only be connected to a power supply which is described either in the operating instructions or in markings on the product.
Power Cord Protection. AC power supply cords should be placed such that no one is likely to step on the cords and such that nothing will be placed on or against them.
Periods of Non-use. Foreign Objects and Liquids. Take care not to allow liquids to spill or objects to fall into any openings of the product. Water or Moisture. The product should not be used near any water or in moisture.
Do not place the product near heat sources such as stoves, heat registers, radiators or other heat producing equipment. When installing the product, make sure that the product has adequate ventilation. Improperly ventilating the product may cause overheating, which may damage the product. The product should only be used with a rack which the manufacturer recommends.
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The user should only attempt the limited service or upkeep specifically described in the operating instructions for the user. For any other service required, the product should be taken to an authorized service center as described in the operating instructions. Damage to the Product. Qualified service personnel should service the unit in certain situations including without limitation when: a.
Liquid has spilled or objects have fallen into the product, b. The product is exposed to water or excessive moisture, c. The AC power supply plug or cord is damaged, d. The product shows an inappropriate change in performance or does not operate normally, or e. The enclosure of the product has been damaged. Confidential Alesis Service Manual A 1.
These values are then mathematically manipulated, and stored at various locations in a memory "loop" for eventual playback. By varying the placement and amplitude of incoming samples, discrete time delays are achieved. When mixed together, and converted back into analog, these delays simulate the reflections associated with natural reverbs, and delays, as well as non natural effects such as reverse reverbs, and gated reverbs.
The added capabilities of an 80C31 micro controller allow for user manipulation and storage of algorithm parameters, as well as effects such as chorus, and flange, that require real-time manipulation of algorithms. Please note that there are several different board revisions, so differences will be noticed from unit to unit. Input from J7 is R. F filtered or bypassed in some units by the large torroid and C While operating the unit monauraly, the input impedance fixed at K R2, and R3, in parallel.
From there, the inputs are buffered by U1, and passed through the input potentiometers. The stereo signal is then sent to a X10 gain stage U1 etc. The summed stereo signal is sent to the anti-aliasing filter consisting of most of U4, and associated resistors and capacitors.
There are several important features in the filter to be aware of. This signal is injected into the signal path at U4 pin A signal diode at pin 10 limits the incoming signal to 5V, preventing damage to the analog switch U6. The output of U4 pin 8 has a tap running to R46, a 2N transistor, etc.
This diff-amp speeds up the response time of the comparator. At the appropriate time, the DAC will output the processed left, and right signals. After passing through low pass anti aliasing filters 2 op amps of U3, Misc. The idea is to divide the process into short, manageable sections. Each significant binary weight starting with the Most Significant Bit is taken in turn, thus requiring only 16 comparisons to achieve a final value. The process begins with the input "sample and hold" circuit.
When the switch is turned off, the capacitor will hold that level indefinitely [barring internal leakage ]. This process continues until a value is found for all 16 bits, and the data is ready for further processing by the ASIC. In order to see these signals properly on the scope, it will be necessary to use an external scope sync use U6, pin 9 as the sync source.
Note that the data buss serves a dual purpose. This buss multiplexes between low order addresses 1st 8 bits , and data. Latch U26 is used to hold the low order address half, during read and write cycles. When this circuit is functioning incorrectly, a complete lock-up of the machine, will occur. A thorough knowledge of the operation of this circuit will greatly facilitate troubleshooting this unit.
Note that the first units released did not incorporate the full reset circuit described below. Most of these early units have been retrofitted with an extra board containing the newer reset circuit. The newest board revisions incorporate the reset on the board. When the raw supply reaches approximately 7 volts, the transistor will turn on, discharging Cl 00 through R, and dropping the reset line low.
During write cycles of the , data on the data buss is made available to a series of latches U12, U22, and U Consequently, data can be "stored" into a latch simply by writing a value into a nonexistent memory location. Memory mapped input works much the same. The address lines are again decoded when A15 is active.
The can then read the data for use as necessary. This allows the to manipulate algorithms in real-time. Because the two devices operate asychronously a great deal of control logic is necessary to prevent buss conflicts.
Timing is so critical throughout this circuit that parts that are even slightly out of spec will cause failures. This is due to the fact that propagation delay times are not only significant, but inherently part of the design. If the logic seems a bit confusing at first, it helps to remember that many of the target signals are active low.
The M3 also utilizes a double buffering system to ensure smooth operation, i. At the end of the of the current sample period, the banks are switched. The "FLIP" bit is used to keep track of this.
Zeitmaschine: Alesis Microverb I und II, Hallgerät
Alesis MicroVerb 3
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