Question about Onkyo TX-DS838 Receiver

1 Answer

Muted Sound Hi I have this Onkyo amp in for repairs. The unit outputs at very low volume with the knob full clockwise. The signal is amplified but variable to just after the opamps but is muted before the RCA cable that plugs into the power amp module. I have traced the problem to the muting circuitry but it seems that the microcontoller uPD78P058GC is responsible for the muting circuitry as well as a host of other things. What could be causing the microcontoller to do this? This microcontoller is obviously preprogrammed at the factory so what is my chances of just swapping it out for a new one or how do I get the new one to be programmed?

Posted by on

  • Archimedes Mar 17, 2008

    The ouputs are all muted. Very low level +/- 13mv

    I have tested the Front left and right channels at the preouts too.

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Master
  • 4,234 Answers

What is the signal level at the tape-out jacks? Is that level "normal"?
Dan

Posted on Mar 17, 2008

  • ABRsvcs Mar 17, 2008

    I'll look up this specific model, but in the meantime, look for missing voltages in the muting area.

    Dan

  • ABRsvcs Mar 17, 2008

    If you order the part from Onkyo, include the suffix with the part number. That indicates the imbedded software revision. They may upgrade it for you as there are always improvements. The upgrade will work if it is sent.

    Dan

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How many watts onkyo p3300 amp & pre-amp home stereo audio


Sorry I don't know the answer to your question because I don't know the specification of your amplifier but like a car engine that might have a capability of, say, 200 horsepower, in use and for practical purposes that figure is completely immaterial because most of those horses would never be used by a responsible driver. It requires only about 20 horsepower for an average car to maintain 50mph so it hardly matters what the potential power output is as long as it is capable of doing the work assigned to it.

The average person listening to a hi-fi in an average room requires an average power output of around half a watt. It is immaterial if the amplifier is capable of 50, 150 or 500 watts because for comfortable distortion-free listening most of that potential power will never be used.
With hi-fi the problems start with the speaker systems. It is a mistake to use a high power speaker in a domestic environment regardless of the potential amplifier power output. The amp will only produce the power it is capable of if it is driven hard (the volume turned up) and because doing that is anti-social, wasteful and harmful to health and comfort that should not happen but high power speakers tend not to reproduce sound efficiently at low power and so more power must be provided than would otherwise be needed with good low power speakers.
Fashions have changed and it is now difficult to find good hi-fi speakers for the domestic environment that reproduce sound efficiently at low power levels and speakers with a 10 watt rating, the ideal type for small to moderately-sized accommodation, are almost impossible to find these days but it is still possible to find good drive units rated at between 20 and 50 watts that perform fairly efficiently at social volume levels.

Nov 02, 2015 | Onkyo Audio Players & Recorders

1 Answer

Can a Onkyo tx sr604 receiver be used as a pre amp?


Yes. You can use the Line Out, or Pre-Amp output into another receiver or amplifier. The receiver or amplifier you use as the amp, will need to have a volume control, as the line output coming from the TX SR604 cannot be varied.

If you have any further questions, please visit my website at audioserviceclinic.com and contact me there.

Thank you.

Jun 06, 2014 | Onkyo Audio Players & Recorders

1 Answer

Connect Sharp LCD tv to Onkyo TX8011 Receiver


The Onkyo TX8011 is a Stereo Receiver. Two ways to connect:
1) The HD Cable box should have an audio out (typically red and white). Connect this to the Obnkyo CD input (red and white). The volume may be controlled with the Cable box remote or Onkyo remote. The TV volume may be muted or ON.

2) Connect LCD TV's audio out to Onkyo TX8011's CD input.
This is not a great way to set up, as the TV volume, when moved high, will attenuate (over load) the amplifier, leading to a jarring sound on the speakers. To avoid this, the TV volume should be ALWAYS FIXED low.. say about 30%. Only the Onkyo's volume should be adjusted while watching.

Hope this helps.

Nov 20, 2013 | Onkyo Audio Players & Recorders

1 Answer

My Amplifier is in good working condition, except for the volume control has gone weird Using the remote, you can increase volume, but not decrease volume. On the unit, rotating the volume control...


Cleaning the contacts may help. The volume knob should pull off. Once its off use a non-flammable contact cleaning spray to clean the contacts behind the knob.

Electronics and automotive stores should have this.

May 16, 2011 | Onkyo TX-DS494 Receiver

1 Answer

Hi there, our amp is giving us very low sound output even when volume is turned up to maximum volume. We have been unable to find the remote and are wondering if the remote was turned right down would that...


I'd look at the front panel for the Mute Button and the Mute Indicator, but turn the volume down for any further investigations. If you can't hera the sound at 1/2 volume, it ain't there. No sense risking a sudden volume surge that will kill your speakers when you finally find the problem.

http://www.retrevo.com/support/Harman-Kardon-HK3270-Receivers-manual/id/386bh430/t/2/

Also check the T-Mon Indicator. If it;s on you have the Tape selcted for listening instead of a source.

Volume/Mute Indicator: This

indicator will glow green when the

HK3270 is turned on. Its position

will enable you to judge the relative

volume of the unit even when the

speakers are muted or turned off.

When the indicator is pointing

towards the left, at an "8 o'clock"

position, the volume is low; when

it is pointing to the right, as in a

"3 o'clock" position, the volume is

loud. When the unit has been muted,

pressing the Mute button ïâthe
indicator will flash

Dec 26, 2010 | Harman Kardon HK 3270

1 Answer

Hi i have bought an onkyo ARV 401 amplifier and i


You can choose any speakers to go with your amp as long as
1) they will allow the amp to perform at its best ( impedance and power handling)
Ideally you will buy speakers which will handle the full amps output plus more, then when you turn it up LOUD, you will not break the speakers

2) you still like the sound when they are demonstrated, installed at your home.

Sound is a very individual thing, if you like it then its fine, after all you are the one listening to it most.

Hope this helps
Thanks for using FixYa




Aug 07, 2010 | Onkyo TX-SR875 Receiver

1 Answer

Onkyo tx-sr601 bi wire with zone 2


SMCCARTY,
The idea behind bi-wiring speakers is to get the highest quality of sound by getting the sound from two separate sources doing separate jobs. Lower frequencies are harder for an amplifier to produce than higher frequencies. So it is common to give these frequencies to two different amplifiers so each can produce the highest quality of sound. By removing the low end from the top end amplifier, it provides the top end amp more headroom thus reducing the chances of clipping. Clipping can easily be heard from the tweeters destoying not only the sound but your speakers as well. It is common practice in pro and car audio to use separate amps for subbass, low, mid and high; four amps working together to their corresponding drivers (more or less depending on the system and type of audio being produced).

In your case, getting the two different sources from basically the same amp (power supply), would not accomplish the full intent of bi-wiring; it would just make more wiring for the same end result. However still a good thought on your end. Onkyo receivers are great because of their beefy power supplies. Not very many other brands have such strong power supplies. Denon's are close but not equal.
Chris-

Feb 14, 2010 | Onkyo TX-SR601 Receiver

2 Answers

Hi there .......my sa gx303P stereo amplifier/tuner technics ...the cooling fan for the power amplifier works only on a somewhat strong signal .....if you play soft music at low volume the cooling fan...


These units are designed to only run the fan when necessary. If the unit is overheating, there is a problem in the detection circuit. This is a relatively inexpensive repair. If you are getting overheating when running at a low volume, it suggests that the speakers are not matched to the amp. In other words, the amp is expecting an 8 ohm load and is being presented a lower ohm load. This makes the amp work harder and generates more heat. Check the speaker wires and make sure that they are not frayed or crossing in any manner. Also, verify that the rating of the speakers is correct.

Update this with what you find.

Thanks,
Dan

Dec 02, 2008 | Technics Audio Players & Recorders

3 Answers

My Onkyo Receiver TX 601 is turning itself off


Several things can cause this: Loud signal passages can momentarily draw high currents at the mains, especially if you have unit plugged into power stripe with other equipment. Or if unit is plugged into isolation transformer, current draw may exceed output of transformer. Too many speakers hooked to output or if one is bad (partially shorted due to overheating)

Apr 04, 2008 | Onkyo HTR500 Receiver

1 Answer

Onkyo TX-DS838 Issues


The problem here is that the output amplifier section has a problem. This is detected internally and the system shuts down in a "protect" mode. The output section really only kicks in when you attempt to bring up the volume. Another possibility is a problem in the "front end" where DC current is being passed to the amp section. Without takeing measurements, it is difficult to determine the exact cause. This should be a relatively stright-forward repair for a service shop and should cost about $20-$40 in parts plus the local labor charge.
Dan

Dec 23, 2007 | Onkyo TX-DS838 Receiver

Not finding what you are looking for?
Onkyo TX-DS838 Receiver Logo

Related Topics:

93 people viewed this question

Ask a Question

Usually answered in minutes!

Top Onkyo Audio Players & Recorders Experts

Dennis McCollum

Level 2 Expert

137 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

 Grubhead
Grubhead

Level 3 Expert

4678 Answers

Are you an Onkyo Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...