Sony DCR-TRV Operating Instructions Manual page 196

Usable cassettes
Notes on the cassette
When affixing a label on the cassette
Be sure to affix a label only at the locations illustrated below [a] to prevent a
malfunction of your camcorder.
After using the cassette
Rewind the tape to the beginning, put the cassette in its case, and store it upright.
When the cassette memory function does not work
Reinsert a cassette. The gold-plated connector of the cassette may be dirty or dusty.
Cleaning the gold-plated connector
If the gold-plated connector on the cassette is dirty or dusty, the remaining tape
indicator is sometimes not displayed correctly, and you may not be able to operate
functions using cassette memory.
Clean the gold-plated connector with a cotton-wool swab, about every 10 times that the
cassette is ejected. [b]
196
Do not affix a label
along this border.
[a]
[b]