The SCPH-10420 is the remote sold for newer PS2s with the IR receiver built-in (the package does not come with the SCPH-10160 IR receiver). Apparantly the OLD remote is compatible with newer consoles (minus a few new functions only on the new remote), but going on your experience along with a few other people's I'm going to have to guess that the reverse may not be true - perhaps the SCPH-10420 is simply not compatible with the old IR receiver.