Samsung SGH-i750 free download

File name Samsung SGH-i750 service manual.pdf

GSM TELEPHONE SGH-i750 GSM TELEPHONE 1. 2. 3. 4. 5. 6. 7. 8. CONTENTS Specification Circuit Description Exploded Views and Parts List Electrical Parts List Block Diagrams PCB Diagrams Flow Chart of Troubleshooting Disassembly and Assembly instructions 1. Specification 1-1. GSM General Specification GSM900 Phas e 1 Fr eq. Band[MHz] Uplink/ Downli nk ARFCN r ange 890~915 935~960 1~124 EGSM 900 Phas e 2 880~915 925~960 0~124 & 975~1023 45MHz 270.833kbps 3.692us 576.9us 4.615ms 0.3GMSK 33dBm~5dBm 5pcl ~ 19pcl -102dBm 8 35Km DCS1800 Phas e 1 1710~1785 1805~1880 512~885 PCS1900 1850~1910 1930~1990 512~810 80MHz 270.833kbps 3.692us 576.9us 4.615ms 0.3GMSK 30dBm~0dBm 0pcl ~ 15pcl - 100dBm 8 - Tx/ Rx s paci ng Mod. Bit r ate / Bit Pe r iod T ime Slot Period / F rame Peri od Modulati on MS Power Power Cl a ss Sensit ivit y TDMA Mux Cell Radius 45MHz 270.833kbps 3.692us 576.9us 4.615ms 0.3GMSK 33dBm~5dBm 5pcl ~ 19pcl - 102dBm 8 35Km 95MHz 270.833kbps 3.692us 576.9us 4.615ms 0.3GMSK 30dBm~0dBm 0pcl ~ 15pcl - 100dBm 8 2Km 1-1 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization Specification 1-2. GSM TX power class TX Power control level 5 GSM900 TX Power control level 0 DCS1800 TX Power control level 0 PCS1900 33±3 dBm 30±3 dBm 30±3 dBm 6 31±3 dBm 1 28±3 dBm 1 28±3 dBm 7 29±3 dBm 2 26±3 dBm 2 26±3 dBm 8 27±3 dBm 3 24±3 dBm 3 24±3 dBm 9 25±3 dBm 4 22±3 dBm 4 22±3 dBm 10 23±3 dBm 5 20±3 dBm 5 20±3 dBm 11 21±3 dBm 6 18±3 dBm 6 18±3 dBm 12 19±3 dBm 7 16±3 dBm 7 16±3 dBm 13 17±3 dBm 8 14±3 dBm 8 14±3 dBm 14 15±3 dBm 9 12±4 dBm 9 12±4 dBm 15 13±3 dBm 10 10±4 dBm 10 10±4 dBm 16 11±5 dBm 11 8±4dBm 11 8±4dBm 17 9±5 dBm 12 6±4 dBm 12 6±4 dBm 18 7±5 dBm 13 4±4 dBm 13 4±4 dBm 19 5±5 dBm 14 2±5 dBm 14 2±5 dBm 15 1-2 0±5 dBm 15 0±5 dBm SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization 2. Circuit Description 2-1. SGH-i750 RF Circuit Description 2-1-1. ANTENNA SWITCH (U101:LMG003S-5091A) Switching Tx, Rx path for EGSM900, DCS1800 and PCS1900 by logic controlling. < Truth Table > VC1 Tx Mode (GSM900) Tx Mode (DCS1800/1900) Rx Mode (GSM900) Rx Mode (DCS1800) Rx Mode (PCS1900) L L L L H VC2 H L L L L VC3 L H L L L 2-1-2. FILTER To convert Electromagnetic Field Wave to Acoustic Wave and then pass the specific frequency band. - GSM FILTER (F101) For filtering the frequency band between 925 and 960 MHz - DCS FILTER (F103) For filtering the frequency band between 1805 and 1880 MHz. - PCS FILTER (F102) For filtering the frequency band between 1930 and 1990 MHz. 2-1-3. TRANSCEIVER (U102:UAA3587EHN/C2) This chip is fully integrated GSM GPRS quad-band transceiver with transmit baluns, loop filters and most of the passive component in it. And also fully integrated fractional N RF synthesizer with AFC control possibility, RF VCO with integrated s