Question about Yamaha DSP-A3090 7-Channel Amplifier

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Pioneer Spec 2 Amp no power

I have power at capacitors but no were else what could it be

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  • Albert Nika May 11, 2010

    If you have the unit disassembled and have a voltmeter test on the Caps. then just trace along the wiring or traces; to the next part. This is usually a large power resistor.

    Al

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I would say it is the protection circuits.

You will need the circuit diagram to follow as it will be a bad diode.


Keep the Silver series alive

Oheer-London UK

Posted on Jan 08, 2010

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If you have power at all caps, you should be having power on +/- of power transistors. can you check that? if power is available on all power xtors then you must be experiencing protection mode only.

Posted on Aug 13, 2008

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Hi kken408

you can get a service manual/schematic for your amp from here to help you fault find the problem. If you want want to talk about what you find, please feel free to get back to me here.

robotek

Posted on May 28, 2008

  • Graeme Ross
    Graeme Ross Jun 05, 2008

    Hi, just a quick followup to see how you got on with your
    problem. If you still havent got it sorted, let me know, I am happy to
    do some more research and offer some more information and solutions. If its fixed...
    excellent!! A FixYa rating from you will close this unrated solution
    for me. Thanks for using FixYa. I am happy to answer any other
    questions you may have.



    regards

    robotek


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1 Answer

I have recently aquired bose 520b acoutimass panray base module. can this be connected and work with my 2 pairs of bose 901's.i use pioneer SPEC 1 & SPEC 4{ power amp/pre amp}


Don't you mean "502B"?

Specs:
http://pro.bose.com/pdf/pro/brochures/panaray_502_b/b_panaray_502.pdf

http://pro.bose.com/ProController?url=/pro/products/panaray/panaray502b.jsp

http://pro.bose.com/pdf/pro/manuals/panaray_502_b/ig_panaray_502b.pdf

Why do they call the SPEC-1 a PREamp when it seems to be an INTEGRATED AMP with speaker outputs and all?

http://sportsbil.com/stereo/spec/

I'm going to assume one of the numbered, presumably volume-controlled outputs (1,2) goes to the 901 Active Equalizer and on to the SPEC-4.

The OTHER numbered output could feed the missing Panaray Digital Controller and then, presumably, another amp but like many a 901 owner I've heard of, you COULD skip that part for the 502b and hook them to the unmodifed amps available in the SPEC-1 and see how it works out.

Jul 19, 2011 | Bose Audio Players & Recorders

1 Answer

I have a 1200 watt amp and 2 12 in pioneer champions and it keeps killing my battery how do I hook up this capasitor I just bought?


first make sure your power wire is directly hooked to the battery, {make sure ure in line fuse is pulled} power wire that goes to positive of power cap , ground wire is grounded to chasis, now attach aditional power wire to amp and aditonal grond to amp . make sure all conections are solid and tight { also make sure inside of power cap is tight as well after long periods of time the insides loosen } i have 2 -1,000 watt sony xploid amps and 2- 1,200 watt sony expoid subs and they pound hard . i probley should have 2-1.2 farrid caps for what i have but it seems that its holding its own

Dec 04, 2010 | Metra Tsunami 1.2 Farad Capacitor

1 Answer

I need an owner's manuel for a Pioneer stereo power amp SPEC-4. I have a part # ARB-235. I think this amp is a product of the 1970's. Where would I be able to get my hands on the operating instructions?...


You can register with hifiengine.com andfind it and the service manual.

There really isn't a lot to a power amp to be operated. This one differs from most in that it has an input level control and VU meters.

From http://images.google.com/imgres?imgurl=http://www.incomesixdigits.com/spec4/spec4a.jpg&imgrefurl=http://www.incomesixdigits.com/spec4/&usg=__WbFLwPqHXjFHe_P2BCKyTT9CxQY=&h=652&w=1156&sz=526&hl=en&start=2&um=1&itbs=1&tbnid=5SVKh2leUGWXmM:&tbnh=85&tbnw=150&prev=/images%3Fq%3Dpioneer%2Bspec%2B4%26hl%3Den%26rlz%3D1R2ADFA_enUS360%26sa%3DX%26um%3D1


Dynamic 150 + 150 Watts Power Output, Generous High-power Design
The Spec-4 employs DC construction which excludes capacitors from the NFB circuits and uses a dual transistor differential amplifier with a current mirror circuit in the 1st stage. This provides a stable operation and also high gain over a wide frequency range. The pre-driver stage is a class A amplifier circuit with a regulated current circuit for the load. This makes for high-gain amplification with superior linearity. Furthermore, there is an overdrive limiter and power limiter circuit which is designed to protect the power transistors and make for added reliability.
The power stage employs a 3-stage Darlington pure complementary parallel SEPP circuit.
The SPEC-4 delivers Continuous Power Output of 150 watts per channel, min. RMS, at 8 ohms from 20 Hertz to 20,000 Hertz with no more than 0.01% total harmonic distortion.

Completely Independent and Perfectly Stable Left / Right Power Supplies
The mighty power supplies are completely separated for the left and right channels. Also, each channel is provided with two 22,000uF large-capacity electrolytic capacitors and large transistors with a superior regulation. They achieve outstanding channel separation and a clear, powerful reproduced sound, in addition to the wide frequency response. There is a built-in surge killer circuit to suppress inrush currents from the power transformers and high currents which charge the electrolytic capacitors. This circuit ensures that none of the parts are affected by these adverse currents.
Protective Circuits Composed of Fast-response Relays and Electronic Circuits
Each channel is protected by a DC and over current detection relay circuit. In the event of the speaker terminal shorting due to poor connections or when DC current is generated in the output, the output circuit is immediately disengaged and the speakers and transistors are safeguarded against any possible damage. The protective circuits also function as muting circuits when the power switch is turned on and off.
Peak Level Meters with Outstanding Waveform Response
This power amplifier incorporates logarithmic compression peak meters with a wide scale (-40 -+3dB). With 8-ohm speakers, they allow the output to be read out from 0.01W to 300W. Moreover, the meters feature a fast response for peak signal indication. In addition to the peak output reading, it is easy to interpret the dynamic margin with respect to the SPEC-4’s clipping level.
Input Level Controls with dB Calibration
The SPEC-4 is equipped with input level controls with direct readout attenuation values (-dB). These can be used to continuously adjust the input levels for each channel in accordance with the rated output voltage of the preamplifier. In this way, the SPEC-4 can perform the proper gain control according to the preamplifier’s output level. The preamplifier will thus be used in the condition possible for the best S-N ratio and distortion characteristics.
Stylishly Professional Front Panel Design
Just as you would expect from a sophisticated system, the SPEC-4’s front panel is professionally designed with the large level meters in the center. Also. The front panel’s dimensions allow the model to be mounted in an EIA standard rack, just like real professional-use amplifiers.
SPECIFICATIONS
ICs………………………………........................................2
Transistors………………………………...........................61
Diodes……………………………….................................62
Power Amplifier
Circuitry………………………………Current mirror loaded differential Amplifier
3 stage darlington parallel push-pull
Direct-coupled OCL. (DC amplifier construction)
Continuous Power Output of 150 watts * per channel, min. RMS, at 8 ohms from 20 Hertz to 20,000 Hertz with no more than 0.01% total harmonic distortion, or 180 watts per channel at 4 ohms from 20 Hertz to 20,000 Hertz with no more than 0.03% total harmonic distortion.
Total Harmonic Distortion (20 Hertz to 20,000 Hertz, 8 ohms)
Continuous rated power output………………………………................................0.01%
75 watts per channel power output……………………………….......................... 0.01%
1 watt per channel power output……………………………….............................0.01%
Intermodulation Distortion (50 Hertz to 7,000 Hertz = 4:1, 8 ohms)
Continuous rated power output………………………………................................0.01%
75 watts per channel power output……………………………….........................0.005%
1 watt per channel power output………………………………........................... 0.005%
Frequency Response………………………………...............5 Hertz to 100 kHertz +0/1 dB
Input (Sensitivity / impedance)……………………………............................1V/50k ohms
Output
Speaker……………………………….................................................4 ohms to 16 ohms
Damping Factor (20 Hertz to 20,000 Hertz, 8 ohms……………………………….........100
Hum and Noise (IHF, short circuited, A network………………………………........11 5dB
Miscellaneous
Power Requirements………………………………...................................AC 120V 60 Hertz
Power Consumption………………………………..........................................760 watts (UL)
Dimensions………………………………..............................480(W) x 187(H) x 445 (D)mm
18-7/8 x 7-3/8 x 17-7/16 in.

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2 Answers

Pioneer power amp m-770 keeps blowing the 6.3 amp fuse what could be wrong?


Suspect an overload in the power supply or audio output stage.
Power supply culprits include transformer, the big capacitors, diodes, bridge rectifier, voltage regulator etc.
Audio culprits are anything on the heat sink(s).
Look for burnt, damaged parts too, anything running very hot!
Follow the circuit from the fuse see where it takes you too start.

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1 Answer

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need some clarification on your question to see if i can help...

amps = amperes or amplifiers?

if you are referencing RMS or continuous power that will be on the spec sheet that came with the woofer or you can google "ts-sw251 spec" and find that information. really a woofer really only cares about power in watts and resistance in ohms.

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Hi...
I own a few Pioneer SXseries recievers..I repair these and others like them in my own business.
What it needs is new power supply capacitors. Parts are cheap. Labor is a couple hours

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You need to run a larger power/ground cable. If you are reading low, you are not getting the kind of voltage that the amplifier requires to run, you may have been fine before adding the other products but if you wired them all to the same power wire (say an 8 gauge) you'd encounter problems. You should probably use a 2 gauge or at least a 4 gauge power kit.

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preamp out---------to equalizer in-------------equalizer out----to amplifier in-----------amplifier out----------to loudspeakers.

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1 Answer

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