FYI, read this message from C.L. Maher (Fix Tango Int'l) --- 3 years ago.http://lists.contesting.com/_yaesu/2004-05/msg00016.html
The CPU is NO LONGER AVAILABLE --- ANYWHERE.
When I turned the main dial the rig would jump all over the place and the CPU was totally confused.
I bought a junker 757Gx locally that had a good CPU, installed it in my rig, replaced the 5v regulator and repaired the trace and things started coming back to life. Just as a note to anyone with a 757, if you have a failure of the 757 CPU, don't waste your time talking Yaesu for the part.
THEY DON'T HAVE IT ANYMORE. They told me even if they did have the chip, they had no way to program it. So be very carfeul when working in your 757 when it's on.