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If you';re sure it's the instrument, rather than your amp cutting out or the cord being intermittent, do a factory reset. Beyond doing a reset, it's doubtfull this will be a user servicable problem. You need to contact Kurzweil Support. Here is a link to their page Support Kurzweil
I can ONLY give you suggestion.... Note that most of the high power laser devices have safety interlocks to insure the beam is moving before turning laser on. Verify any dip switch settings to make sure they are in a suitable mode. If the laser comes on during test, ASSUME that a setting is wrong. I do not have this unit so my suggestion is general based on experience with other devices.
When thosse resistors (precharrging of main input filters) burn up there is major damage. The IGBT's are usually gone... replace with APT28GA60BD15... the switching regulator IR2153 is gone... one or more of the 2SA1020-Y and the 2SC2655-Y gate drivers are gone. One or both of the DL4148 speedup diodes for the IGBT gate drives will be gone. The Wirewound ceramic resistors either 10 or 22 ohm 10 watt radials... Use: http://www.mouser.com/ProductDetail/Ohmite/TWW10J20RE/?qs=GcOFt9%2fAxQHny%252b35G6iehQ%3d%3d
This is 20 ohms, however Behringer uses from 10 to 22 ohms in these units... 20 works fine as does 10 ohms. If you have toruble getting schematic let me know.
Put one each of the above two capacitors in parallel to make 8 mfd to replace the 8.2 mfd and it will work fine. They only cost 74 cents each. You can find the resistors as well from Mouser.com.
IF YOUR crossover is potted in a hard material, that probablly destroyed the caps. The caps would have to be encased in a foam before hard potting as the shrinkage of the potting material would crush the caps a bit and cause failure.
Sorry Dude If you can not replace a broken string, then you need a few lessons from a friend.Find a pal to jam with. It sounds like you broke your E string. Take it down to the local music shop. Buy a new string and ask the guy to put it on for you. Offer them a tip, its worth it.I could tell you. But you need the string so ask for assistance and see it in 3D. Keep on playing DFD