Keyboard of ORAC MK3 only partialy responds to comands

[asto]

Hello everybody!

Firstly, what is described below is about an ORAC Denford small cnc.
... The keybord is active only to manual mode related entries. The INPUT and FUNCTION sections behave like they are not there.
Yesterday i powered up the lathe and from main menu i selected (5)ENTER NEW PROGRAM and the cursor moved to (5) enter new program.But just this, no more. Pressing the (E)ENTER key happens nothing and the buzzer remains silent giving no feedback sound when depressing keys of the data input section.
Today i tried again but this time the numeric keys along with the FUNCTION group of keys remain staborn and innactive. I can still jog in all axes though.
I feel totally blind here as I cannot get even close to what might be happening.
Is there anybody who can give an idea of what may have caused this problem please?

Thank you

Asto