Tuning a Sharp TV 21HT-15H

Visiting a friend yesterday who inherited the above TV. Asked did I know how to tune it in, bravado - of course I knew how to!!! I have a Sharp at home - not the same model I must admit. Anybody got a instruction manual for this model. I don't think it tunes automatically like more modern versions. I tuned in (manually) a number of channels and eek, eek locked the channels. How do I unlock them? I would love to do ctrl-alt-del to the TV and make it think that it was the first time used - is there a way of doing this? Any help would be appreciated or my DIY skills will seriously be called into question. thanks

have you tried here ?

http://www.sharp.co.uk/Manuals.aspx

Yeah - tried there. The model must pre-date adobe (pdf). Tried their online query system as well and for older models you can order a replacement manual ---- for a fee . Thought somebody here might have one or know how to re-set the tuning. Thanks