Quote Originally Posted by PingvinBlueJeans View Post
The RF output on Japanese systems was designed for Japanese TVs. If it works at all, it will work on channels 97/98 (not 3/4). Give the channels in the upper 90s a try. If you're in the U.S. you'll need to use a North American switchbox or RF-coax adapter as well (the one that came with the system probably won't work).

EDIT: It looks like you're in Japan? So the issue is probably from the fact that you're using a newer (automatic) RF switch. You need to use an older (manual) switch.
I see you noticed my location after you posted. Nice! My PC Engine also works fine. :P

Thanks for the idea of the older switchbox, through. I'll pick one up maybe later this week. I'm guessing that the old Famicom ones should work.