Test the cord with a multimeter; replace the internal fuse if necessary.
To summarize, the key points to take away from this guide are:
Replace batteries. Reposition the radio for AM, or fully extend the whip antenna for FM. Snapped or slipped dial drive cord.
12 months against manufacturing defects. Does not cover damage from misuse, battery leakage, or unauthorized repair.
Because many Blaupunkt 815 portable models are vintage or legacy products, finding a physical copy can be challenging. Use these reliable methods to secure a digital PDF version: