The ZR70 cassette mechanism does not open completely for cassette to be removed and closes up .

There is a clicking sound as the case opens as if a gear is missing and then returns to original position in case.

Canon's knowledge base: My tape will not eject. How can I get it out?

"The most frequent cause of this type situation is not having a power source attached, or a depleted battery pack. Once the power source is available, some models require manually unlatching and opening a cover. When the cover is fully open, the cassette tape will eject automatically after a few seconds. If the tape still will not eject, seek assistance from a Canon Service Facility."

Have you tried to open it via connecting the camera to the AC adapter? If the same thing persists, then you've eliminated a power issue. Which would lead me to perhaps a tape issue. How often do you clean the heads? How often do you use the camera? Perhaps a service is necessary?

Hi, I noticed that you haven't marked any replies as the "best answer." Are you still looking for an answer? If so, I recommend you re-submit it on http://www.digitalcamera-hq.com so it will have a better chance of being noticed. These days it looks like most questions are being answered within a few days.

If you're happy with the answer you received, you can simply click on "Mark for best answer" bubble and it will close out the question. Thanks for posting it and Good luck!