Reset Lamp Hours on Toshiba TDP-ST20
Anyone got one of these Toshiba TDP-ST20 projetors and changed the bulb and then managed to reset the lamp hours? I've changed the bulb, followed the instructions in the leaflet with the bulb (press up arrow on remote while turning power on, wait for beep after 10s, then press down arrow for a further 10s untill the next beep) but no beep and no lamp reset. Tried it don't know how many times now, made sure batteries in remote are OK, remote works, beep turned on in menu (can hear beep when selecting other items in menu so I know it works), any ideas?
Have done one once before and it was a nightmare then but just not getting anywhere. Looked on the net and suggestions of holding down on/input/menu on remote when starting did not work either. There are two 'service' buttons on the projector but don't know how to use them.