Samsung SCH-570 service manual free download

File name Samsung SCH-570 service manual.pdf

CDMA Portable Cellular Telephone SCH-570 SERVICE Manual CDMA Portable Cellular Telephone CONTENTS 1. General Introduction 2. Specification 3. NAM Programming 4. Data Transfer 5. Circuit Description 6. Exploded View and Its Parts List 7. PCB Diagrams 8. Troubleshooting 9. Test Command T ble a 10. Block & Circuit Diagrams Samsung Electronics Co.,Ltd. SEP. 1998. Printed in Korea Code No. : GH68-60724A HONGKONG CHINA. 1. General Introduction The SCH-570 cellular phone functions as only 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/Softer 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 specifications of the below: IS-95A : Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System IS-96A : Speech Service Option 1 Standard for Dual-Mode Wideband Spread Spectrum Cellular Systems IS-98A : Standards for Dual-Mode Wideband Spread Spectrum Cellular Mobile Station IS-126 : Mobile Station Loopback Service Options Standard SCH-570 is composed of main handset, desktop charger, standard battery. 1-1 1.1 General Frequency Range Transmitter : 824.64 ~ 848.37 MHz Receiver : 869.64 ~ 893.37 MHz Channel Spacing : 1.23 MHz Number of Channels : 20 FA Duplex Spacing : 45 MHz MSC Transmitter Frequency FA NO. CH. NO. CENTER FREQUENCY FA NO. CH. NO. CENTER FREQUENCY 1 1011 824.640MHz 11 404 837.120MHz 2 29 825.870MHz 12 445 838.350MHz 3 70 827.100MHz 13 486 839.580MHz 4 111 828.330MHz