Check The Safetytab - RCA VR691HF User Manual

CH ECK TH E SAFETY TAB
No matter which recording option you use, you need to make
sure there is a tape in the VCR, and that the tape's safety tab is
in place. You cannot record on a tape with the safety tab
removed.
Safety Tab
If the safety tab is removed and you want to record over it,
simply cover the hole with vinyl tape.
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