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JVC A-X400 amplifier

No output or meter response (think relay does not close)

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Posted on Jan 02, 2017

SparkGap
  • 363 Answers

SOURCE: Audio Amplifier JVC Model A-GX3

If the service manual is not available on the JVC websites then you should just Google search "JVC A-GX3 service manual" There are many websites that archive manuals. You'll probably have to pay for a copy. Why can't you disassemble the unit and see the output transistor numbers first? More importantly how do you know this is the fault?

Posted on Sep 22, 2007

  • 54 Answers

SOURCE: Hi-Fi Amplifier

OK......if you dont know "where to locate on the amp circuit board"....then you shouldn't be attempting to repair it yourself.

If you should accidentally short 2 solder pads together with a meter lead, you WILL cause very expensive damage to the amp.

The smoke you will smell will be coming from the amp and your wallet.

I would strongly suggest that you take it to a repair shop. Diagnosing and troubleshooting an amplifier is best left to the seasoned pro's. Not because I am bragging, it is because they are a complex thing, and there are no moving parts to watch and let your brain " figure it out ". It never changes the look, whether it is idling or running all out. You must understand transistor theory and implimentation.

As far as crackling and sputtering, it sounds like you have a pre driver problem, or a biasing issue. Neither of which should be too terribly expensive to fix, unless the amp is really old, ( +25 years ) then all the transistors become suspect, because, contrary to popular belief, they don't last forever.

Best of luck....Rob

Posted on Mar 13, 2008

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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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3 Answers

I cannot find the specs or user manual on the JVC archived items list. A few sites want to charge $10.00 for the user guide info, but I think that is too much to charge.


Defiantely not 200 watts
KS-A82
  • 2 Channel Amplifier
  • Bridgeable 2 channel amplifier
  • Output power: 25W x 2, 20 - 40,000 hz at .08 THD
  • 2 ohm stable
  • Adjustable gain (.1 - 2v)
  • MOS-FET DC-DC converter
  • Multi phase connection
  • 1 Pair of line input terminals
  • Remote relay turn on system
  • MSRP: $159.95
http://www.admtechusa.com/JVC.html#KS-A82

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1 Answer

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Chek transfomer with a multi meter set on continuity,check primary input across wires AMPLIFIER MUST NOT BE PLUGGED INTO WALL SOCKET...check outputs low readings in ohms are good no readings mean open transformer(buggered

I suspect outpuit stage short as this probably buggered relay in first place

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Hello, I've been having a problem with my JVC RX-D302B 7.1 Receiver. Whenever I try to power it on, the blue power light comes on for a moment, then it clicks off. I'm planning to take it to a repair...


Unit is going into protection mode because the amplifier output stage is shorted. Measure output voltage of the speaker lines coming out of each output channel...front/center/rear...take measurement before the channel speaker line protection relay. If any voltage is present then that is the output channel that is at fault. Replacement parts are available to the consumer through tritronicsinc.com. If you have experience with a volt meter\checking transistors\soldering it is something you can do. If not it should be left to a service shop. Have a great day!!

barneyluc

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1 Answer

Audio Amplifier JVC Model A-GX3


If the service manual is not available on the JVC websites then you should just Google search "JVC A-GX3 service manual" There are many websites that archive manuals. You'll probably have to pay for a copy. Why can't you disassemble the unit and see the output transistor numbers first? More importantly how do you know this is the fault?

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