Question about Sony MHC-GX555 Mini Hi-Fi System Shelf System

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Sony MHC-5900 Output Problem

Hi!

I have the Sony's MHC-5900 audio Hifi system and last week it started outputting an unclean audio sound (it appears to be "click and pop noise").

I've checked all the cables and connections and everything seems fine. I've realised that if I use the pre-amplifyer in the "Direct" sound mode, this noise doesn't appear in the outputs. However, when I switch to any audio DSP effect (Rock, Pop, ... ), the noise is heard again.

This system is more than 10 years old. May it be some electrolytic capacitors whose time life has expired in the pre-amplifyer? If so, which of them? Can anyone get me the schematics, for at least, the pre-amplifyer?

Regards,
José Oliveira.

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5 Suggested Answers

bbtoast
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SOURCE: No sound from digital out on PS3 using optical cable

Does the end of the optical cable glow red when hooked up to your PS3 while the PS 3 is powered on? Look at it without the cable plugged into the STR-D845.

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SOURCE: Is Sony DAV-S500 optical input compatible with optical output from Pioneer DVD player DV-566K?

I don't think this has an Optical but a Coaxial connection. You might try a coaxial audio cable not optical.

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SOURCE: Sony MHC-2800 setting the clock

Hi, it's simple. First press "Timer1" and Timer2" buttons together, clock on display will start blinking, by cursors "Up/Down" you can change the value of hours and minutes (switching between hours/minutes by "Left/Right" cursor). To save set time press "Memory". Enjoy your set clock :)

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SOURCE: sony str-dg510

Why dvd sound does not play on sony str-dg510?

Posted on Feb 02, 2008

dunnbiker
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SOURCE: no audio output

Were you playing it very loudly when it died?

The manual is here for reference...

http://www.docs.sony.com/reflib/docget.asp?manualid=11654&template_id=1&region_id=1&DL=',600,560,10,10,'Manuals'

It discusses troubleshooting this problem on page 50.

When you turn the receiver ON does you hear a light click in about 5 seconds? That would be the protection circuitry turning OFF to allow the amplifiers to function. The delay is to allow the circuitry to stabilize before it sends any output to the speakers. If you don't hear a click the unit is Protecting the speakers due to malfunction somewhere.

If no click and no apparent messages try turning the speakers OFF using the Speakers button directly below the Power button (1/0). This will eliminate or point to external shorts as the cause.


Does the unit click after 5 seconds of Power ON with the speakers OFF? Isolate your shorted speaker or wire problem.


Still no sound at the speakers when you turn them ON?

We need to establish if there is any programming flowing through the receiver.

A quick basic check would be to tune an FM station, if you have a tape deck attached, place it in Record or Record/Pause mode so it can display the input signal levels. You should see the record meters fluctuating with the level of the program selected. If you don’t have a tape deck, run an RCA cable pair from the audio output for a tape deck to an analog audio input on your TV. Select that input on the TV and you should hear the FM station, or anything the receiver is configured to play. If it's silent then there is no audio signal circulating in the receiver to get out to the amplifiers.

If you hear the program on the TV but not through any attached speakers, then the amplifiers are all disabled for some reason.

If there is no audio flowing through the receiver the problem could be a switch in the wrong position, source not selected, muting on or a multitude of other things.

Let me know how this turns out.

Posted on Apr 03, 2009

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