The cassette player should work with either the A/C cord or 6 C-cell batteries. You should not need to put in batteries first before using the Lennox system to play an audio cassette when on A/C power.
https://www.manualslib.com/manual/92166/Lenoxx-Sound-Cd-102.html?page=10#manual . In my experience, cassette players will fail before other parts of any radio/CD/cassette player audio system.
I wish that I had better news for you.
Cindy Wells
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