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I know in the Betamax world that the SL2000 and the SL2500 had a nicad (I think) battery that would keep the memory to the clock and the 4 event timer programming in place if main power was last. The backup battery was supposed to provide 5 to 10 minutes of backup. Maybe this deck had an internal battery that is now dead and the memory error is due to that issue.
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Sony Trinitron is my favorite brand.
My wish list:
Sony KV-7010U
Sony KV-1220U
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