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The Grundig S350 (DL) runs on one of three power sources: electrical outlet, DD batteries, and AA batteries. There is a switch in the battery compartment that permits to change battery type. I do not know how different the S350 and the S350 DL are, but you should try to find out if it works with any of the two battery types before having it serviced. Clean all contacts of any acid corrosion. Check the manual to see if you have to specify the battery type in the setup too.
The ON button is also a SLEEP timer. The timer can be set to 90 minutes, 75, and son on. The shortest time period is about 1 minute. Press the ON/SLEEP button several times. After each press read the number displayed. As you push the button again you will cycle through all available timer settings. Choose one that its long enough for you. However if you press the ON/Sleep button for a few seconds the radio will play continusously until you turn it off. Just play with the RED button a few times to get an idea how long to press to make the radio play continuously.
Its Deluxe Version the S350 DL can use two types of batteries: D-size or AA. Inside the battery compartment there is a switch to select the size in use. If you use the AA sie batteries, they will not hold in their locations unless you lower a flap and secure them. Have you tried to power the radio with the adaptor?
The picture shows an S350 -- if your model looks like that but with a different designation this fix may still work:
Look above the gain knob (bottom right) and then above the Tuning fast -- slow lettering. You should see a reset hole. Use a paper clip to reset the radio.