Recently, I've been working in a cleanroom with several large fabrication machines, including sputtering, PECVD (Plasma-Enhanced Chemical Vapor Deposition), and photolithography systems. They are the largest and most complex machines I've ever worked with. At first, I felt completely overwhelmed by the countless functions, settings, and operating procedures. However, as I gained more research experience, I gradually became calmer and more confident. By observing my colleagues, asking questions, and helping with routine tasks, I slowly learned how to operate each machine. Because the cleanroom has been operating for many years, the equipment often breaks down. Sometimes, even a small error can cause an entire machine to stop working, delaying every process that follows. As the equipment ages, these malfunctions become more frequent. This has made me realize how important it is not only to know how to operate the machines, but also how to troubleshoot and repair them. Otherwise,...