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                      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 :

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