I search the Service Manual with diagrams for my sony BVM-14E5U, it's the same manual that BVM-20F1U or BVM-20E1U.
I found it but it is necessary to pay:
http://www.user-manuals.com/bvm20f1u-p-832048.html
And here but the link does not work
http://www.electronic-circuitry.com/e/a ... 15680#ecms
Thank you for your help