This manual introduces the use of business projectors DX-400, DX-380, DX-300, DX-280, DS-250, mainly including safety instructions, lamp safety instructions, how to use the remote control, how to install and connect the projector, how to turn on and off the projector, how to use the screen and other contents.
This manual covers the Jolimark DX series projectors (DX-400, DX-380, DX-300, DX-280, DS-250). It includes safety guidelines, installation steps, operating procedures, and maintenance tips to help users get the most out of their devices.
Key sections include RS‑232C interface details, technical specifications, troubleshooting advice, and contact information for Jolimark support. This manual is written in Chinese.