On Wednesday, November 22, 2017 at 11:06:39 AM UTC-5, wrote:
I have this receiver and when I lose power, great power company, the station pre-sets are lost and the stations need to be entered again. The manual states that they are retained for up to a month. Is there a battery to replace?

There will either be a battery or a capacitor for that purpose. Yes, they wear (out) and yes, replacing it should do it. If you have a schematic, you should be able to trace it, and determine what it is.

Some products, such as Revox and a couple of others, have user-replaceable batteries (AA batteries behind a little door somewhere) I am not sure if Sony ever took this expedient, but if they did it would be in the manual.

Peter Wieck
Melrose Park, PA