I have used Sony 100V adapters in the US (my voltage is 120) for years with
no problems. The R-90 has the ability to detect higher than appropriate DC
voltage (it should give the "Hi DC in" error message). So I doubt that is
the problem. You could test this by buying a 120 V transformer from an
electronics store and return it if it doesn't solve the problem. I suspect
the battery is having trouble accepting a charge. It might have gone bad.
Do you have another battery you could try? Buying a spare is not a bad idea
anyway.
Regards,
Leland
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