Question about Bose LifeStyle 5 Series-III CD Shelf System

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Can you tell me the fix?

Hi,

Could you please let me know the fix? I have the same problem...audio drop...is this an op amp?
turns on no sound...what should I do?

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  • Master
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Please describe the issue in detail?

Posted on Oct 08, 2008

  • Legin Varghese
    Legin Varghese Oct 08, 2008

    Does the power LED come up?
    Did you try different source (input)


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  • Bose Master
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Can you be more specific, tell me the model, and what is the problem.

Posted on Oct 08, 2008

  • Ginko
    Ginko Oct 08, 2008

    If there is no power at all, then check power cable and power outlet. Can be the fuse in the power board, inside, or the power board blown.

    If it starts, and if you have no sound at all, and you suddenly lost sound, maybe with a pop while amp was working, then you may have blown someting on the final amp section.

    Check also speakers and speakers cable, sure you did this already.



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Hi,
The AVR have problem in its pre amplifier stage. Normally this type of cracking noise will hear because of faulty op amp (operational amplifier) ics. To repair such problems you should have through knowledge in electronics. And also need SMD rework stations Beacuse all the op amp ics are SMDs. If yo have such knowledge then i have added here the link to the service manula for your AVR.

Refer the page number page number 13 first. Its the Audio section blaock diagram of the AVR. you can see the the suspected ic in the top right corner marked as IC410. Which is the pre stage op amp for the frond left righ amplifier. You have to replace this ic( integrated circuit).

You can find the position of the ic by refering Page number 27. Its the input board . On the board you can see three ics with 8 legs(four in each side) On the left side. You have to replace the ic marke as IC410. You can find the schematic for the input board in page number 26. the The part number of the ic M5218AFP-T .

Refer the sevice manual to know how to carefully to remove the input baord.

http://sportsbil.com/sony/STR/STR-V/STR-V333ES_V444ES_V555ES_v1.2.pdf

If you need any more assistance feel free to conatct me through fixya.

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About the only thing I would think you could do is to CAREFULLY open the unit and look for a loose cable involved with sending the audio to the volume control panel and then the cable that takes the audio to the jack board...

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What kenwood or any other EQ uses transistor or coils not op-amp


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As we all know, imaging is in the ear of the beholder. I would think a purist would shun EQ on principal.

I have no feelings either way but I have heard tube fanatics claim they are superior to solid state. Tomato / tomahto.

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My amp turns on but the sound goes in an out


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Difference between audio amplifier & OPAMP


An audio amplifier is a general term that applies to any amplifier specifically designed to cover the audio spectrum, and usually referres to power amplifiers (of any power from micro headphone amps (like the headphone audio amplifier circuit in an ipod) . to power amps like the ones used at rock concerts that are several thousand watts).

An OP-AMP is an Operational Amplifier, which refers to a type of amplifier circuit. Op-Amps can amplify audio, but are not restricted to it. They are used in many things from audio circuitry to signal conditioning, and sensing from all kinds of equipment from seismometers, to light sensors, temp sensors, insturmentation amps, lab amps... RF amps etc...

There are many many different types of op-amps that are designed for many different applications. Mostly the parameters are frequency response, gain, and input/output impedance.

Op-amps usually come in an IC package of some sort. The most common are 8 pin DIP package types.

Op-amps do NOT handle power. (although there are some hybrid power op-amps available, they are specialty devices) The term op-amp refers to the ability of the amplifier to be manipulated mathematically by external values. (i.e. resistors set up to add, subtract, or multiply the value of the input signal) Hence the term OPERATIONAL amp, because it is performing mathematical operations on the signal. (They were first used in analog computers, allowing the voltages to be added, subtracted, and such, and displaying the resultt by directly reading the voltage value).

They handle only small signals, and require being followed by a POWER amp to do anything useful, such as drive a spleaker, or a relay, or a transducer.

For your question, most all audio amps consist of stages.

There is an input/pre-amp stage (this is usually where the eqalization, signal processing, and bass/trebel tone controls are implelented) and a power amp (output) stage that takes the signal fromthe pre-amp and raises the voltage and current to a sufficient level to drive speaker.

The input/pre-amp stage is most usually composed of a series of op-amps. Op amps also are responsible for the bass/trebel control, and the EQ.

There will most usually always be several Op-Amps in every Audio Amp.

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1 Answer

Can you tell me the fix?


Hi, Sorry does your question relate to a display problem or a sound problem? If it is a display problem let me know the colour of the perspex, strange question I know but it does help me identify the unit.
Dave

Jun 30, 2008 | Bose LifeStyle 5 Series-III CD Shelf...

1 Answer

SOUND CUTS OFF AT HIGH VOLUME AND POWER LIGHT FLASHED RED


You need to check the DC voltage across the power and ground terminals of the amp. If the voltage drops below ~11v when the amp shuts off, you need to check the power/ground wiring and fuses.

If the voltage remains above 11 volts, you may have a problem with the load on the amp (incorrect ohm load, shorted speaker, shorted speaker wires...).

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