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Doesn't sound like a fuse. They don't fix themselves when you reach 75%.
Try shaking the volume knob while in the 30-50% range and/or try (with the power off) rotating the volume knob numerous times from 0% to 100%. If when you plug it back in it responds ANY differently, you might have a bad volume potentiometer. If when you shake the knob you hear static or intermittent sound, you have a bad volume pot.
The only other thing I can think of is that the wiper of the volume pot is not in contact with the windings inside the pot until you reach the 75% mark. When the volume comes on at 75%, does it start off kind of "static" then come in loud and clear? Also try this.... adjust the volume pot to 74% (or when the sound just begins to come on). At this point shake the knob. If you hear static, replace the volume pot.
Unplugging it when still on shouldn't cause any damage... in fact it probably hasn't considering it works at 75% plus.
The volume knob is dirty. Behind the face of receiver the "pot", (as they are called) needs sprayed with contact cleaner. I use CRC QD contact cleaner. If the volume is a slider your can use the straw type devise for pin point spraying in the slider slot with receiver off and unplugged. After spraying work the slider back and forth to distribute the cleaner inside. If you have to remove the cover for a rotary "pot"spray while working the dial. Hope that helps..
Hiya you should be able to get a pot at any electronics supplier if there are any in your area. Pots are fairly standard (if this is a 270 degree pot). Take it into them and ask them for an equiv. Most important is it is probably a Log pot, They should be able to arrange... If theres no solution there, let me know... take you through it. Good luck
Check your owners manual for "factory reset" this will reset the main micro-processor. Otherwise the encoder (volume pot) needs cleaning, soldering or replacement. It could also be a cracked circuit board (if it has recently been hit)
Sounds like you have a faulty master level control, or dry solder joints connecting it. There are a few things that you can do to sure this. .
Pop the unit apart so you can get access to the control solder side of the printed Circuit Board.
First, visually check the soldering to the control where it connects to the board,
If soldering to it looks ok, then try a squirt of CRC 2-26 contact cleaner lubricant into the internals of the master control.
Before replacing it you need to be sure that the pot is faulty is to look for audio in the center wiper of connection of the control. You will need some test gear to pursue this level of diagnosis
If you have audio in and out from the pot, then there is a failure after the pot in the summing amplifier stages. No audio into the pot points to the stage prior to it.
If you have no experience with this sort of repair work to high density surface mount circuitry, then I strongly urge you get an audio tech to have a look at it for you;:) This sort of repair expect to set you set you back $40-80 across my workbench, depending on what needed to be done. Good Luck
In my case, if I push in on the balance knob, I can get the channel that quits to work for a while. This leads me to believe that the pot is dirty as opposed to a circuit or component failure. A couple of years ago, I sprayed circuit cleaner into the pot as best I could and the problem disappeared but, it has returned. My next attempt will be with one of the newer cleaner/lubricators that are available now. I don't know if this will solve your problem but, it might be worth a try. BTW, getting access to the volume/balance pots takes some doing. As long as you are there treat both pots. Greydog(1) G
Well here goes a spelling problem for me. You need to replace a component called a podentiomiter. It is the actual volume control behind the knob. I have had to replace a few of these, and pioneer seems to to more prone to these problems.