In this web content, David Popovits, an electronics repair expert, provides his insights and tips on portable recorders made by Sony, Sharp, and Aiwa. He explains that these machines are complex and delicate, consisting of numerous electronic components and mechanical parts that must all function perfectly for optimal performance. David highlights some common problems with portable recorders, such as issues with screws, the recording head, power supply, external jacks, heat and moisture sensitivity, and pressure on the buttons and other parts. He also offers advice on how to avoid these problems and maintain portable recorders properly. David concludes by discussing the difficulty of attempting home repair on a portable recorder and emphasizes the importance of having the proper training, tools, and service manual for successful repair.
https://www.minidisc.org/repair_info.html