Samsung SCH-A205 service manual free download

File name Samsung SCH-A205 service manual.pdf

DUAL MODE(CDMA/AMPS) PORTABLE TELEPHONE SCH-A205 Manual SERVICE DUAL MODE TELEPHONE CONTENTS 1. General Instruction 2. Specification 3. Circuit Description 4. NAM Programming 5. Test Procedure & Test Command 6. Electrical Parts List 7. Block Diagram 8. PCB Diagram 9. Schematic Diagrams 10. Exploded View & Its Part List ELECTRONICS Samsung Electronics Co.,Ltd. Dec. 99 Pinted in Korea. Code No.: GH68-02022A 1. General Instruction The SCH-A205 cellular phone functions as both analog cellular phone working in AMPS(Advanced Mobile Phone Service) mode and Digital cellular phone working in CDMA(Code Division Multiple Access) mode. CDMA type digital mode applies DSSS(Direct Sequential Spread Spectrum) mode which first came to be used in the military. The DSSS reduces channel cross talk and allow to use one frequency channel by multiple users in the same specific area, resulting in increase of channel capacity to about ten times compared to that of analog mode currently used. Soft/Sofer Handoff, Hard Handoff, and Dynamic RF Power Control technologies are combined into this phone to reduce the call drop while usage. CDMA digital cellular network consists of MSO(Mobile Switching Office), BSC(Base Station Controller), BTS (Base Station Transmission System), and MS(Mobile Station). MS meets the specifi- cations of the below :