Service manual for Samsung SGH-X450 GSM phone with circuit diagrams, parts lists, and troubleshooting flowchart.
This service manual provides detailed technical information for servicing the Samsung SGH-X450 GSM telephone. It includes specifications, circuit descriptions, exploded views, parts lists, block diagrams, PCB layouts, and a troubleshooting flowchart. The document is intended for technicians and covers RF, baseband, power, and audio subsystems, including component-level details and control logic.
The manual is copyrighted by Samsung Electronics Co., Ltd. and contains proprietary information. It details GSM frequency bands, power classes, RF filters, oscillators, LNAs, modulators, and power management circuits. It also covers connectors, JTAG ports, keypad interfaces, EMI filtering, and audio components including the YMU762MA3 LSI for music playback.
| Frequency Bands | EGSM 900 (890~915 MHz), DCS 1800 (1710~1785 MHz), PCS 1900 (1850~1910 MHz) |
|---|---|
| Modulation | 0.3GMSK |
| Tx Power Class | Spel ~ 15pcl, Opel ~ 15pcl |
| Sensitivity | -102dBm (GSM), -100dBm (DCS/PCS) |
| TDMA Mux | 8 |
It supports EGSM 900 (890~915 MHz), DCS 1800 (1710~1785 MHz), and PCS 1900 (1850~1910 MHz).
The modulation is 0.3GMSK across all supported bands.
The sensitivity is -102dBm for GSM and -100dBm for DCS and PCS bands.
The TX power class for GSM 900 is Spel ~ 15pcl.