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After a few minutes of recording, my camcorder displays only coloured vertical lines on the screen and viewfinder, and this is all that is recorded. Switching it off and on does not clear the problem, neither does resetting the factory defaults. How can I resolve this problem, please ? Geof

You need to gain access to the drum heads and clean them…here is a useful tip ….do NOT use qtip on the actual heads..the fine strands of wool can catch on the drum heads and pull them off or out of alignment…just use inkjet printer paper….hold it against the drum and rotate the drum with your finger or wooden stick.Clean the rollers with a qtip by all means….I use ISO alcohol to dip the tip in…you should see dirt lift off onto the tip…keep using a clean tip until it seems clean.