Question about Onkyo TX-DS838 Receiver

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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?

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  • 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.

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  • 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

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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.

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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.

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1 Answer

I do not see any inputs to connect a subwoofer to my Onkyo A-9555 integrated amp. I would like to know if it is possible to connect it and what kind of subwoofer should I buy for that wit the best...


You amp has no OUTputs for a sub, but if you really want to attach a sub you'll need to get one that is self-amplified and accepts >>>stereo<<< High Level or Speaker Level inputs.

Otherwise your amp's volume control won't also control the sub's volume.

You would feed it full-range audio from the speaker terminals on your amp and its internal amp would use that to develop its own power output for the sub.

Here's one example.

http://www.ch.onkyo.com/files.download/skw-205_manual_e.pdf




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Iv connected a set of citronic pd1 dj turntable to aux on my onkyo av amp and the sound is really low volume is set at max.if this is because iv got the wrong kind of amp what connections would i need on...


Turntables that have magnetic cartridges must be connected to an amp that has a "phono" connection otherwise the sound will be too low. I have an Onkyo and that doesn't have one, so I suspect yours doesn't. So what you need is what's called a cartridge pre-amp. This will amplify the signal to the Onkyo. Search online, try Amazon for one.

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2 Answers

Car amplifire when conected to nokia mobile music player and when sound level increases of the mobile device the output sound cuts and plys also plys very low sound


Mobile r not good for playing music in a heavy system because Mobile has not a good sound quality as iPOD and others players have, also all mobile has not a capacity to play with amplifier, and the sound output of your mobile is low there fore u r getting low sound. If your amplifier has its own volume control then u can increase it from there. It is best to use iPOD. Thanks 

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1 Answer

What to do


Hello dodgeram1980,

If you are not getting sound from any of the 4 channels, I'd suspect that either the amp is not getting an input signal or the amp itself is faulty.

Here's the "no sound" troubleshooting step-by-step procedure from the JL manual:

1) Check the input signal using an AC voltmeter to measure the
voltage from the source unit while an appropriate test tone is
played through the source unit (disconnect the input cables
from the amplifier prior to this test). The frequency used should be in the range that is to be amplified by the amplifier (example; 50 Hz for a sub bass application or 1 kHz for a full range / high-pass application). A steady, sufficient voltage (between 200mV and 5.O-volts) should be present at the output of the signal cables.

2) Check the output of the amplifier. Using the procedure explained
in the previous check item (after plugging the input cables back into the amplifier) test for output at the speaker outputs of the amplifier. Unless you enjoy test tones at high levels, it is a good idea to remove the Speaker Connector Plugs from the amplifier while doing this. Turn the volume up approximately half way. 5V or more should be measured at the speaker outputs. This output level can vary greatly between amplifiers but it should not be in the millivolt range with the source unit at half volume. If you are reading
sufficient voltage, check your speaker connections as explained below.

3) Check to ensure that the speaker wires are making a good
connection with the metal inside the Speaker Connector Plugs. The speaker wire connectors are designed to accept up to 12 AWG wire. Make sure to strip the wire to allow for a sufficient connection with the metal inside each terminal.

Hope this helps.

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That should be normal. The main inputs usually go directly to the power amp. If you want volume control, put a mixer with faders beween them... Radio Shack used to have some inexpensive mixers.

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1 Answer

Sound


Set your SAT receiver to full volume and use your Sony TV volume control as the master volume control. If you use an external surround sound amplifier do the same thing using the amplifiers volume control as the master volume control.

Consider that all source devices that have the ability to control their output volume will output what they call line level 0dB when the source device is set for maximum volume. If you set the source device to 1/4 volume your output to the amplifier may be around -25dB or lower. Introduce that low of an audio level to the amp and you will have to turn the amp up to half way or better causing the amp to amplify noise too.

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My Onkyo Receiver TX 601 is turning itself off


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No sound from the amps outputs


field inspection is more accurate than on line and it depends on the personal of the service spechialist.and from here i can not make fair judgement.

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