Derik has an electrical question for readers:

“I have two HO Marklin power supplies that does not work. Can somebody give me drawings or explanation of how to repair them please . The latest one that doesn’t want to work is 6631 Schalter T25/E?”

Derik will need to be aware that any comments made by readers on this blog are personal opinions only, and he should seek proper advice from an experienced electrician if he is in any doubt regarding electrical safety.