RA – read user manual online or download in PDF format. Pages in total: Specifications. Power output: 90 watts per channel into 8Ω (stereo), W into 8Ω (mono). Frequency response: 10Hz to 70kHz. Total harmonic distortion: %. Alesis RA Pdf User Manuals. View online or download Alesis RA Reference Manual.

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Alesis RA300 Manuals

To avoid these problems, many professional studios and live sound To connect an unb. Thus, the inputs of several amp. Audio amplifier conforms to the following Standards: I also measure the continuity of the original relay. This confirmed that the discontinuous sound problem was caused by this relay. The in-circuit-resistance of this potentiometer changed linearly when I adjust the left channel volume knob, and it tested the same as right channel volume potentiometer.

ALESIS RA Service Manual download, schematics, eeprom, repair info for electronics experts

And in 10minutes testing, both channel worked great. I set my multimeter to A,esis voltage position. Alesi not discard substitute any other type of AC cord is designed to the packing materials; they may be helpful in the connect to an outlet that includes three pins, with unlikely event that you need.

Route cables Conn Summary of the content on the page No. Before powering up, I set the volume of both my phone and the amplifier to minimum.

To avoid these problems, many professional studios and live sound To connect an unb Summary of the content on the page No. When I turn on the amplifier, and let my phone play the music, I observed a around 5VAC reading on my multimeter.

Turning on the amplifier and my phone, and setting my multimeter to ACV position, I decided to traced music signal from back to front. After replacing the relay, the sound appear. I started to suspect the relay. I turn on the amplifier, set the amplifier volume level of both channels to the middle point, and gradually increased phone output until I heard music from the speakers.


My cellphone music output was used as the signal source, and was connected to the amplifier signal input, as shown in Picture 1. This confirmed that the contact inside the relay was bad. After carefully studying circuits in the service manual, for this kind of problem, the culprit could be the volume potentiometer, a component in preamplifier circuit board or power amplifier circuit board.

We know that when the switch is open, the voltage should be the full voltage of the amplifier output; and when mxnual switch is close, the voltage should be close to zero. The tab is proper installation and operation of a power recessed and a tool small screw driver, pencil, pen, amplifier is the capacity of the circuit feeding the etc. To applications apesis the RA series amplifier. Be sure that the AC power is off prior Alesis amplifier: These should recommends that you use three-conductor shielded be good quality shielded cables with a stranded not cable even in an installation that uses unbalanced solid internal conductor.

The r300 channel works fine. Summary of the content on the page No. Ne alesid enlever la prise de terre du cordon secteur. Posted by Brandon at Turning off the amplifier, I tested the left channel volume potentiometer.

Connections Isolation transformer or direct box To feed the same source to several If your mixer or other sound source doesn’t have a different amplifiers: They may be fed from 4 and 6. Equipment for testing included the amplifier, a pair of speakers, and my cellphone.

The physical size is the same, but the coil resistance different. A grounding-type plug has two Summary of the content on the manula No.

To complicate matters further, a speaker represents an inductive load, and is more difficult to drive than a purely resistive load. The option to print the manual has also been provided, and you can use it by clicking the link above – Print the manual.


This symbol alerts the user that there are important operating and maintenance The relay is controlled by the speaker protection circuit, which consists of U1 TAP and other components.

Do not discard substitute any other type of Mahual cord is designed to the packing materials; they may be helpful in the connect to an outlet that includes three pins, with unlikely event that you need Summary of the content on the page No. One probe was connected to the left channel, red color speaker binding post which was connected to J7 pin 1another probe was connected to J3 pin 3.

This signal then goes through one of the normal-open-contacts insides of relay Janual, then goes to a external speaker. Akesis power entry is via a detachable, grounded IEC connector cable. Chapter 2 To use an unbalanced source with manuual Warning: At RadioShack I found a 12V relay with two normal-open-contacts.

As of this point, I have no idea that the problem is just one channel or both channels, the time from power up to sound disappears.

Alesis RA300 User Manual

Speaker cables to connecting or disconnecting any signal must deliver large amounts of peak current to a wiring. If you want to quickly view the content of pages found on the following pages of the manual, qlesis can use them.

Many people prefer to read the documents not ea300 the screen, but in the printed version. The relay coil loop is: However, if you do not want to take up too much of your disk space, you can always download it in the future from ManualsBase.