Hi Fernando,
That is bad news, but I think we can get it fixed.
First, make sure the signal from the DTG is coming from a red Gate out jack instead of the blue CV out jack. Sometimes the CV signal gives random operation but the gate always give a clean transition.
The next thing to do is to make sure all ICs and ribbon cables are firmly seated in their sockets.
There is a good chance that the setting of the SENS trimmer was knocked out on impact, so you might want to try adjusting that to see if you get better operation. Don't worry about messing anything up for now. I can coach you through proper adjustment later.
If none of the above works, can you send me some high resolution pictures of the PCB and rear panel wiring? I have diagnosed TKB faults from photos before, so we might get lucky.
Nick Liebrecht
(King of the TKBs)