This is a technical and instructional paper designed for a user manual or an academic guide on product functionality. It bridges the gap between Islamic prayer time calculation logic and user interface design. Abstract: The Al-Fajr clock is a specialized timekeeping device used by millions of Muslims worldwide to determine the five daily prayers (Salah) and the time for Fajr (dawn) in particular. Unlike standard clocks, setting the Azan (call to prayer) on an Al-Fajr device requires understanding astronomical calculation methods (angles) and manual override protocols. This paper provides a systematic methodology for configuring Azan times on Al-Fajr clocks, addressing common errors such as improper Fajr angle selection and daylight saving time (DST) mismatches. We present a step-by-step hardware interface guide, a mathematical basis for calculation adjustments, and a troubleshooting matrix. 1. Introduction The accuracy of the Fajr prayer time is critical, as it marks the onset of the daily fast during Ramadan and the first prayer of the day. The Al-Fajr clock series (including models Fajr-1, Fajr Pro, and Digital Dual-Display) operates on pre-programmed astronomical algorithms. However, user error in setting the device leads to a phenomenon known as "Azan drift," where the call occurs several minutes before or after the correct local time.