Its holiday time again so I dusted down my trusty (!) pc100 dv camcorder and bought a couple of new tapes (sony). I always lay down an initial time code on the entire tape before I use them so there is a consistent time code when I come to editing on my PC. Anyway I left it recording a blnak scree nand when I came back it didn't seem to have laid down a time code. Or picture. So I record with the cam pointing out the window. nothing. i put an old used tape into the machine. It plays for about a second and then pixelates and then freezes. The tapes does not look crumpled. I am assuming this is clogged heads although they look fine. can I clean these myself or do I have to send them off?