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First obvious question...did you check the batteries? If not put in fresh ones. Next, plug in the house connector to bypass the batteries. Does it work that way? If not, opening the case is a must. Go to the back of the volume knob and with a small alligator jumper put it between the pins to bypass the volume sweep. If it works that way, the switch needs to be replaced. Beyond that you can search for shorted wires going to the speakers.
I have seen in some cases where the rechargeable battery is part of the B+ circuitry when adapter is combined, this maybe normal for this model. But you might be able to go online to Bosch and find out more information from customer support or the technical department.
Mines similar, outlets work but radio will only work on battery. Radio will not work on mains only. Charger works at same time so ok. SORTED IT TONIGHT. Inside the charger inside the box there is a fuse (240v 2A) I think, tiny radio fuse. Changed that tonight and radio now works on mains only or battery. Very awkwark job but better than watching a load of cr** on tv. Hope this helps someone.
Did you try with batteries? If that works, the internal power supply fails. A handy person with basic knowledge of electricity
measurement, some good screw-drivers, a multi-meter and a soldering iron may solve most probably the problem.( You find persons with such disease at most unexpected places)
Getting spare parts in case of need maybe a little more difficult.