JVC CP6U Adapter "p6u" Questions

How to open jvc c-p6u cassette adapter? Change the AA battery.  I did and the switch worked and it ejected.I had no idea there was a battery involved. Panel on left end

I have a JVC C-P6U Cassette Adapter,I have not used it for some time as there was a cassette inside I put it in my TV and played the tape which was great when it was finished I wanted to remove it and