Hi,please check your private messages.
Also having got a few splinters in my fingers form scratching my head as this model is some 20 years old,I think the way to set the foot switch is as follows:-
press button marked "mode set" and enter into the number pad "02" this should enter the foot setting mode, now if I remember right use the up/down buttons at the side of the display or in the number pad to change the led display so it reads "SUS" this should now mean you control sustain from the foot switch.
If the foot switch is not a genuine Technics you need a make/break foot switch from your local guitar shop that has a changeover switch fitted so the switch is press to make or can be press to break (off the top of my head I can't remember which way round Technics are) if the switch is set incorrectly sustain operation will be reversed ie:- press to remove sustain. in which case just swap the switch position.
hope this is of use.
regards John.