How do you earse internal memerory - Akai Mpc2500 Music Production Center

Two possibilities: power supply or internal fuse (and internal components ).
See if power supply works on another equipment or check it with a VOM.

If you are referring to the User Data, then yes that would be gone.
Time to reset and start re-programming

John
With AC power off.
Use a meter (on Ohms scale) to check internal fuse for blown (open) fuse.
If you feel qualified & safe with AC Power On.
Check input to internal power supply on AC Scale (Caution when AC is on) for volts in.
Use meter on internal Power Supply for "probably" DC volts leaving internal Power Supply electronics to power the rest of the electronic circuits.
Switch mode power supplies can break down. They stop doing their high frequency switching so they don't convert AC to DC.
If this P/Sup is a separate box or circuit board, inside the unit, then it can have a part number & be replaced.
Good Luck

Are the internal speakers properly connected via the rear-mounted 1/4 inch "Speaker Output" jack? If so and still no sound, try connecting a separate external speaker (floor monitor, pa cabinet) for a "low volume" test.

The OM says the internal speakers are 4 ohm so it's unlikely that a wiring problem with speaker connections would cause all four to stop working. With AC power disconnected from outlet check for an internal speaker protection fuse BUT be careful. Charged capacitors can hold a charge for weeks!!!

Change internal fuse on battery. Unit will not work unless battery is connected but battery needs fuse to be good

If this monitor is humming without nothing connected to it, maybe the electrolytic capacitors from its power supply are bad - they are responsible for filtering the fluctuation at the output of the internal voltage rectifiers that transform the AC input voltage into a DC voltage to feed its internal amplifier.

When they fail, the supply voltage for its internal amplifier that should be flat, continuous, now presents a pulsating profile, according to the mains frequency (generally 60 or 50 Hz, depending on the country you're in). So, the output of the amplifier will be varying at the same rate, producing the humming.

Another possibility is that one internal cable connection that should be shielded is now disconnected or loose and is picking the hum from the internal power supply.

Anyway, maybe you should take it to a service center and have it checked.

Hope this info may help you!

I had that problem too. What you need to check is the input level on the right side. Turn the wheel all the way up to 100 and the internal mic should be fine.

The basic unit requires 10 watts at line voltage. Modifying the unit internally would be a disaster. You are better off using an invertor to drive it.

The internal supply will be a switching type and probably generate +/- 15 volts and +5 volts.

Without reading the manual, the easiest solution that occurs to me is to not use a cable between the audio out on the Ewi and the amp or mixer you are using. You can also set the main volume to zero. That setting does not affect the program volume.

Go to http://www.thedx7.co.uk/ Click on 14 Battery Change which is a walkthrough. You will; have to do a sysex data dump to restore the sounds. All that info should be on that site as well as some other great stuff. Hope this helps.