got photo of symbol/display not child lock is it? as almost positive sharp make same design could have made them for Hitatchi or visa-versa, wife still works for sharp Llay UK bought out by Foxcon/M (Iphone displays etc), in qc dept testing Miele/wolf and Electrolux large fitted in oven/Mwo models and worktop models,dont make any sharp Mwo’s anymore here in uk as made in far east = cheap labour. might be able to get service manual from sharp intranet for you if you want, i can but try?