When I rotate the volume control knob, it either does nothing, adjusts the volume appropriately, or in the opposite direction[ie louder when turning in the softer direction, or softer when turning in louder direction. It is erratic.
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The volume control pod needs to be flushed with electronic control cleaner, unplug and remove back, attach supplied straw and give the pod two or three good blasts in the tiny hole and rotate volume back and forth rapidly to reach desired results.
The volume control needs a good flush out, take the unit apart to expose volume control pod, buy some electronic contact cleaner and flush the pod while turning the volume back and forth, repeat 2 or 3 times. Note some pods have small slot where you can spray.
I think the problem will be somekind of audio IC that controls volume and other aspects of the sound has failed. Not a job for an amateur to fix as it will almost certainly involve the desoldering and refitting of multi-pin microchip. I would take it to your nearest Sony Service center.
The fact that it turns down again means it's probably fixable.
Open it up (switch it off first), and fetch a soldering iron. Look around for wires that go from the volume control and see if any are loose connections/broken wires etc etc. Solder these again, and it should work.
If you don't fancy this, take it to a hifi shop and they'll fix it for you (there'll probably be a fee involved)
the volume control needs to be cleaned. this control is a step switch basicly. and the switch contacts are not making proper contact. cleaning this requires dis-assembly and desoldering so if you are inclined to do this work happy fixing if not it shouldn't cost much to fix.
Normal Aiwa compact shelf units use what is called a jog switch for the volume. Usually you can tell the difference if when you you turn the volume up or down. It goes a short distance and seems to spring back. In this case there are two momentary contact switches. One for up one for down. With a plastic lever on the back of the knob that bumps the approriate switch whether turning down or up. If the lever is broken it will bump up against one but not the other. If it is broken plastic you know how good gluing plastic goes it never seems to hold.