This document is the repair manual for SGH-C400 mobile phone, which details the disassembly, assembly, circuit diagram, and troubleshooting of the phone
This manual provides detailed information for servicing the Samsung SGH-C400 GSM telephone. It includes safety precautions, full specifications, product functions, array‑course control procedures, exploded views, disassembly and assembly instructions, electrical parts lists, block and PCB diagrams, and a flow chart for troubleshooting.
Reference data such as abbreviation tables and technical parameters are also included to aid repair technicians in diagnosing and fixing the device.
| Frequency band (EGSM 900) | 880~915 MHz |
|---|---|
| Uplink/Downlink (EGSM 900) | 925~960 MHz |
| MS Power (EGSM 900) | 33 dBm~5 dBm |
| Sensitivity (EGSM 900) | -102 dBm |
| Operating temperature | 20°C ~ +50°C |
Repair should be performed in a shield box, avoid magnetic objects, use a standard screwdriver, use a thick twisted wire for measurements, and ensure the device is powered off when working on the battery charger.
The phone supports EGSM 900 (880‑915 MHz), DCS 1800 (1710‑1785 MHz) and PCS 1900 (1850‑1910 MHz).