1. The customer prepares samples and materials and submits them to the testing agency 2. The laboratory of the testing agency conducts the test. If it is a PSE round shape, the LCS will issue a statement letter 3. For the PSE diamond, factory inspection is also required 4. After passing the test and factory inspection, the certification agency issues a PSE diamond certificate Application materials 1. Application submission materials: relevant application forms 2. Test preparation materials 3. CB report (including Japan's difference test) 4. Circuit diagram 5. PCB design drawings related to safety regulations 6. Specifications of transformer and coil parts 7. List of key components and their certificates 8. Japanese manual or assembly manual 9. Japanese nameplate and warning sign (including PSE sign and notified supplier name) 10. Structural data table 11. List of factory production and calibration certificates, etc. (for factory inspection).