Technics cassette deck records automatically when pressed play


Hello folks,
I have  a RS-BX606 cassette deck of Technics. When I want to play a cassette, the deck automatically starts recording. The monitor indicator lights up and the rec indicator as well. Stopping this procedure by pressing stop, pressing the monitor switch to tape and not source, and pressing play again, allows me to just play the tape again. Usually I have to do this two or three times to work.

What causes this automatical triggering of recording? And can I do something about it?
klaas_technics
Thank you, both, for responding so quickly. I was aware of the function of the tabs on top of the cassette and in the past I have put out lots of them in case I would accidentally press record.
I am interested in the defect causing the deck to record on my cassette. You have given me two possible options. Thanks for those.
For the chip I have to go to an expert. But I can try and follow the solution Czarivey gave me. Should I be able to find that lever easily?
Even with the timer switch set to Off, the recording starts. It would be great if that had solved the problem...

Czarivey, I found the lever which engages the recording.
Still, it makes no sense that the lever causes the problem.
It doesn't send the signal to begin recording. It just makes recording possible.
So, the suggestion that a chip may have a defect, sounds plausible to me.