Canon ZR 90 Instruction Manual page 238

Cleaning of Video Heads
Digital video camcorders are recording signals in very thin lines (as thin as 1/8 of
a hair). Therefore, following symptoms may appear if video heads become dirty
even a little.
• Mosaic (Fig. 1) or stripes (Fig. 2)
appear on the picture during
playback.
• Sound becomes distorted, or there is
no sound during playback.
Fig. 1 Fig. 2
If such symptoms appear, clean the video heads with the Canon DVM-CL Digital
Video Head Cleaning Cassette* or a commercially available dry cleaning
cassette.
If the symptoms reappear shortly after the cleaning, the videocassette may be
defective. Stop using the cassette.
* Availability differs from area to area.
Video heads may become dirty under the following conditions:
• When using the camcorder in humid or hot places.
• When using cassettes with damaged or dirty tape.
• When using the camcorder in dusty places.
• When using the video heads without cleaning them for a long time.
Note:
Before you make important recordings, clean the video heads and make a test
recording first. We also recommend cleaning the video heads after use before
storing the camcorder.