A little more triage would be in order before you take a knife to it. Starting with - what's the patient's name and model number? What source(s) produce the low sound? Have you referred to the manual(s)?
Find the manual and evaluate every indicator on the face to make sure you understand what they mean and how they might affect operations. Look for Speakers NOT enabled, Muting ON, a Tape or other input inadvertantly selected. If you fail to find the errant setting, treat it like a new install and set it up all over again according to the manual.
Once again, use medium volume for troubleshooting.
Register and download the manual for free at retrevo.com
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See page13. Check the muting control.
I have the original manual
The mute fm was off, but the tiny volume doesn't change if I turn the mute on or off
At max volume there is a VERY low sound - medium volume is just a little hum
If you do any more troubleshooting with max volume you will kill the speakers when that aha moment and flipped switch that's in the wrong postion unleashes the amp's full fury. Use medium volume for troubeshooting. Dead amps would emit NO sound at all.
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There is a good chance that a common control may have developed a high-resistance or 'dead' spot through idleness and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.
Turn the volume to something reasonable and see if that helped.
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model Onkyo TX-903
Sound suddenly dropped while playing
tested with other speakers
affects all inputs FM-AM CD and tape player
can hear faint sound with volume at maximum,
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