Need to change the fuse in a vestax pmc

Try replacing the fuse by one with same voltage and rating. Usually if you take a look at paperwork that came with the mixer it will show you which fuse you should use.

so its a buzzing noise. are your turntables grounded? some dont have to be. the buzzing could be several things feedback from something around you or the mixer is buzzing cause of to much power. just mess around w stuff your not gonna break it. and what i mean about that is more wires check wires. dont preform open heart surgery on your equptment. sometimes the buzzing means the faders are going i own 3 vestax mixers and on my pmc 17a right before the faders went i had massive buzzing sound.

If mixer is working properly, check the rating of the adapter versus what the unit requires. Some sites indicate this requires a 12 volt adapter rated at 1.2 amps.

I assume you swapped thee output leads as well as the inputs which you di mention, to verify you amps and cables...
The Vestax schematic I have is NOT your same model, but the companies often re-use circuitry. In the schematic I have it appears that the two channels go through two levels of NJM2068L op amps.
In these two levels there is both a master gain control. It is important to know whether the gain control varies the output level of the right, even if it is low. Also in this gain control area is a master balance pot which varies the ratio of the left and right and is CAPABLE of taking either channel to near zero output... IF you have that control check it for sure !!! The pot is a dual employing both an A taper and C taper which is a reverse of the A.
The right tool for troubleshooting this is an oscilloscope, but first an inspection looking for board cracks around the output and pot area is in order.

Talk to a teacher you trust, Talk to your parents, phone a help line, take it to your local police.

I'd try this company:http://www.wdgreenhill.com/ I had good service from them and I live in Canada. They are in Rochford Essex.

This has the earmarks of a failed power adapter. If the voltage is low, everything will saturate. WARNING: You could do damage to the electronics if you try to drive high levels through the unit to compensate for low output from unit.

Check the voltage from your adapter. Check it UNDER LOAD as it may collapse when connected to the unit.

if it was unplugged then not much could go wrong, unless you have small kids around the house, so maybe you should check the panning pots to see if they have been changed.

assuming that its meant for a 110 outlet then you may want to check the internal fuse the high volatge would have blown the fuse before doing any real damage good luck!

Likely a power supply problem. Will require service. If uses external pwoer cube, try a replacement of correct rating and polarity.