HC101-121 50 Hz User and Technical ManualFor Serial Numbers beginning with XXXXXX through XXXXXXclick below to download the associated manual151506 through 163101163102 through 170204170205 through 170302170303 through 172701172702 through 173504173505 through 174004174005 through 180405180406 through 183603183604 through 184001184002 through 190803190804 through 191404191405 through 192502192503 through 192702192703 through 193304193305 through 195302195303 through 202302From 202303 to present