Keyboard not powering up. Want to change the fuse/s. Don't know where fuse is located.

Locate the fuse on the keyboard. Possibly blownout

if you don't want to wait, you can go to radio shack and get a universal adapter for a bit more, but it should work no problem.
http://www.amazon.com/HQRP-Adapter-compatible-Keyboards-Replacement/dp/B004TXDL3C

If batteries or power adapter does not power up the keyboard...possibilities are...if it has a fuse inside or fusible link check it.replace if blown.Another possibility is power component has a short. maybe from constant movement of power plug into keyboard.sometimes just by inserting the plug and wiggling it can solve the issue..having this fixed by a technician can cost a lot of money.but,if your keyboard`s value is less than the cost of fixing it,might as well replace your instrument.

Give me the correct sequence to factory reset my Korg pa80

I once had this problem with another Casio synth.
I hadn't the power adapter ant I tried with an other one, with the same specifications : the synth was apparently powered but it didn't work.
I finally understood that it was a problem of polarity (+/-). You may just have to cut the cable and resold it inverted.
Hope it could help!

Check that your power adapter is 12 volts DC AND MOST IMPORTANT is the center pin is positive... this is reversed of MANY adapters used for pedals, etc. The current rating should be around 1.5 amps. Don't take another techs word for it... check it yourself.

The only change you need to make for the 120 operation should be to change the fuse to a 2 amp fuse. Faint static is typical of the electronic noise of amps... as long as it it is faint. The power supply will act differently on 120 than 240... probably takes a brief more time to get the system stable, hence the initial buzzing. As long as it performs don't worry about it.

If you are running on batteries, they are either depleted OR may have corrosion on the contacts in the keyboard which is COMMON problem. If using an adapter, the cords chronically work loose. A last problem is the switching for using battery or adapter can have poor contacts. If you don't have an adapter, get one and get one SPECIFICALLY for the keyboard... I don't know how many I have had to tell they have the wrong adapter and that is why their unit won't work.

Assuming this has worked in the past (otherwise if you have changed to different pedal that is the problem) the usual thing is the machine samples the state of the pedal at power up and assumes the polarity of the pedal is at rest. Make sure you are not pressing it as you power up. Also verify the pedal is COMPLETELY plugged in... sometimes they are not quite fully in and that causes a problem, especially with the two stage versions that are sometimes used.

The answer is you DON'T replace it without repairing the cause, lest you cause further damage to the internal components. Often the fuse is contained in a plastic "boat" that is right alongside where the power cord plugs in. You have to remove the cord to lift the tab on the boat.