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I have an old JVC AX-11 stereo integrated amplifier that has gone on me . The power indicator is working but thats it . Can a fumbler like me fix it or is it curtains for an old and until now faithful friend that has never let me down in 20 years ?

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6 Suggested Answers

  • 4234 Answers

SOURCE: help urgently required.....

The click you hear is the power relay. Normally that would be followed by amother click of the speaker relay. In this case, the output section is in protect mode because of a fault detected. This will prevent the speaker relay from turning on the speakers. This amp will require repair. I don't recall your specific model, but if it has discrete transistors, expect a parts cost in the $20 range. If it has a single output amp pac, then the part could be in the $65 range. Add in the local labor rate for the complete repair cost.
Dan

Posted on Apr 02, 2008

  • 1 Answer

SOURCE: No power

Hello

This isn't a solution I'm afraid but we have also suddenly lost all power for the same Hitachi model (have checked the fuses too) and were wondering if you ever found a solution to your problem?

Posted on Aug 18, 2008

dunnbiker
  • 8546 Answers

SOURCE: I have a JVC RX618V stereo receiver which is about

Please clarify. No "stereo" output or no output, period?

What source(s). Try FM.

Is Tape Monitor On? Turn it Off.

Speakers On or Off?

Posted on Jun 26, 2010

dunnbiker
  • 8546 Answers

SOURCE: i have a fisher ca-9335

Something doesn't add up. You mention two connections to the speakers - CA-9335 and a "simple jvc cd player". Is that true? If so, you might want to UNconnect the CD from the speakers and run it into the receiver where it belongs. An amp isn't designed to share the load with another live device; or even have electrical contact with anything BUT speakers.


Did you actually find documentation that supports this hook-up? Or just winging it?

Posted on Feb 21, 2011

Testimonial: "thank you it works great now "

kerguney
  • 575 Answers

SOURCE: I am thinking of replacing

Hi,this unit has New solid reference standard chassis,means that superior to JVC AX 330 ,as long as you can afford ,it seems to be a good selection..Please visit the following links to get experts reviews..

Hope this helps!
Take care and please
Remember to rate/vote and give me 4 Thumbs Up for me to continue f
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-------------------

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Price: $1199.00 , Reviewed By: Steve Holding
Magazine: Australian Hi-Fi Vol 40 No 3 (May/June 2009)
The PM7003 is very similar to the highly-awarded PM7001KI in that it, too, uses completely symmetrical circuitry, and benefits from the use of Hyper Dynamic Amplifier Modules (HDAMs) which use current feedback rather than voltage feedback to enable greater dynamics, particularly when the amp is driving speakers whose impedance drops below their nominal value.
This equipment review consists of a full subjective evaluation of the Marantz PM7003 Integrated Amplifier, plus a complete test report, including frequency response graphs conducted by Newport Test Labs, plus an exhaustive analysis of the test results written by Steve Holding. This equipment review is currently available only as a low-resolution pdf version of the original magazine pages. You can download it here: Marantz PM7003 Integrated Amplifier Review and Test Report.pdf
http://www.avhub.com.au/index.php/Product-Reviews/Hi-Fi/marantz-pm7003.html

*******************

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Using a two-stage construction concept, the PM7003 incorporates a dual-mono circuit design with short, direct and mirror imaged signal paths for precise, improved stereo imaging via symmetrical right and left channels.
Alongside the high grade components and current feedback Hyper Dynamic Amplifier Modules designed to preserve dynamic structure and tone, the design incorporates Marantz's proprietary Current Feedback amplification to deal with the loudest loudspeaker.
An oversized toroidal transformer offers low impedance wide bandwidth power with lots of energy reserve and instant current delivery to drive every type of speaker load, with 150W available across its two channels.
As is the norm, circuit shielding, heatsink, gold plated terminals and the reference standard chassis ensure sound quality is at its best, while Marantz's D-Bus connectivity is catered to.
An Amp Direct mode means it can operate as a power amp only. On sale now, the PM7003 retails at £400.
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Read more: http://www.avreview.co.uk/news/article/mps/uan/2514#ixzz1Q7nI9DWd


--------
The Marantz PM7003 stereo current feedback integrated amplifier is the perfect solution for the audiophile seeking uncompromising musicality with flexible operation. Delivering 2 x 70 watts into 8 ohms, this amplifier features symmetrical circuits for perfect image balancing, and uses high-grade audio components and current feedback HDAMs (Hyper Dynamic Amplifier Modules) to preserve the music's dynamic structure, tonal quality and stereo image. The 2-stage construction concept, the short, symmetrical signal paths and the stable power supply, supplying high-speed instantaneous current, further underline the superb build-quality of the PM7003. The phono MM input and two pairs of speaker terminals complete the list, making the PM7003 the perfect centre piece of your stereo system. Enjoy the exceptional sound quality of the Marantz PM7003.

  • Current Feedback 2 x 70 watts (8 ohms) power amplification
  • New solid reference standard chassis
  • High-speed instantaneous current supply power amplifier design
  • Fast signal handling and extended frequency range
  • Marantz current feedback Hyper Dynamic Amplifier Modules HDAM
  • Symmetric circuit architecture , Linear Drive Power Supply
  • High-grade audio components
  • Source Direct function for best sound quality
  • Six audio inputs including phono (MM)
  • Amp direct mode for operation as power amplifier only (for bi-amp mode or extension of A/V-Receiver) . Two pair of speaker outputs - A/B

Posted on Jun 23, 2011

dunnbiker
  • 8546 Answers

SOURCE: I have a JVC ax-r87bk

Posibly nothing. Look at the controls and indicators for a clue.

--

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as another possible root cause forintermittent shutdown.

Posted on Jul 11, 2011

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1 Answer

I have a JVC ax-r87bk stereo amplifier, I had not used it for about six weeks. Today I tried to play the unit but NO AUDIO sound comes out ! What could have possibly done wrong with the amplifier ?


Posibly nothing. Look at the controls and indicators for a clue.

--

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Check for loose speaker connections at the speaker as another possible root cause forintermittent shutdown.

Jul 11, 2011 | Audio & Video Receivers

2 Answers

I am thinking of replacing my now very old JVC AX 330 amplifier with a Marantz PM7003 amplifier and want to know if this is a suitable replacement in terms of power output etc.


You, sir, are a rare adherent to stereo-only electronics. Are you replacing it for cause (showing its age)? The PM7003 is only 2 x 70 watts like the JVC but it also has separable preamp/amps so you COULD upgrade or augment the power output with external amps and still control it all locally.

Of course, any current AVR's do that too and bring digital sources and multichannel audio to the mix for as little as the PM7703 may cost.

Jun 23, 2011 | Audio & Video Receivers

1 Answer

I plug in a regular subwoofer that i took out of a sharp stereo, but it dosnt do anything at all


Is there qan amplifier to power the sub - they use a lot of power.
Sub are great but they are not just a bolt on speaker.

Feb 25, 2011 | JVC RX-D202 Receiver

1 Answer

I have a fisher ca-9335 integrated stereo amplifier thats hooked up to sanyo tp 1010 turn table and plays out of yamaha ns-70t speakers. a simple jvc cd player is also hooked up to the speakers but not to...


Something doesn't add up. You mention two connections to the speakers - CA-9335 and a "simple jvc cd player". Is that true? If so, you might want to UNconnect the CD from the speakers and run it into the receiver where it belongs. An amp isn't designed to share the load with another live device; or even have electrical contact with anything BUT speakers.


Did you actually find documentation that supports this hook-up? Or just winging it?

Feb 20, 2011 | Audio & Video Receivers

1 Answer

The ic tda7293 is exploited, and I have no further information on the motherboard, I need to find the service manual, thanks


TDA7293 is a high-power high- voltage DMOS audio amplifier IC made by STMICROELECTRONICS. Its rated output power is 100W and maximum operating voltage is120V. And it is a monolithic integrated circuit in Multiwatt15 package which is intended for use as audio class AB amplifier in Hi-Fi field applications, such as home stereo, self powered loudspeakers and Topclass TV.

Feb 07, 2011 | Audio & Video Receivers

1 Answer

Need a new transformer for an old kenwood stereo intergrated amplifier ax-31 cant find out where to get 1


let me give you a tip ;) power transformer has thermal fuse inside its tape-bounding area. try to locate it and check..transformer might be Ok and fuse has blown.

Aug 13, 2008 | Kenwood Audio & Video Receivers

1 Answer

My stereo says "protect" when it comes on then it powers down


The protect messing indicates that a problem was found in the final output stage of the amplifier. To prevent further damage, the system shuts down. The typical problem are the output transistors which can fail. They are usually shorted. Expect a parts cost between $15-$40. Add in the local labor rate for the total repair cost.
Dan

May 29, 2008 | JVC Audio & Video Receivers

1 Answer

No power


Hello

This isn't a solution I'm afraid but we have also suddenly lost all power for the same Hitachi model (have checked the fuses too) and were wondering if you ever found a solution to your problem?

Mar 11, 2008 | Audio & Video Receivers

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