Text preview for : Samsung SGH-E790 service manual.pdf part of Samsung SGH-E790 service manual Samsung GSM Samsung SGH-E790 service manual.pdf
Back to : Samsung SGH-E790 service | Home
GSM TELEPHONE
SGH-E790
GSM TELEPHONE CONTENTS
1. Specification
2. Exploded View and Parts list
3. Chart of Troubleshooting
4. Array course control
5. Block Diagrams
6. PCB Diagrams
7. MAIN Electrical Parts List
8. Reference data
9. Safety Precautions
10. Product Function
Contents
1. Specification
1-1. GSM General Specification .......................................................................................1-1
1-2. GSM TX power class ...............................................................................................1-2
1-3. EDGE TX Power Level .............................................................................................1-3
2. Exploded View and Parts list
2-1. Cellular phone Exploded View ..................................................................................2-1
2-2. Cellular phone Parts list ............................................................................................2-2
2-3. Disassembly ...............................................................................................................2-4
2-4. Assembly ....................................................................................................................2-8
3. Chart of Troubleshooting
3-1. Baseband ............................................................................................................3-1
3-1-1. Power ON .....................................................................................................3-1
3-1-2. Initial .............................................................................................................3-4
3-1-3. SIM Part .......................................................................................................3-6
3-1-4. Microphone Part ...........................................................................................3-8
3-1-5. Speaker Part_1(MP3, SPEAKER PHONE) ..............................................3-10
3-1-6. Speaker Part_2(RECEIVER) .....................................................................3-13
3-1-7. Charging Part .............................................................................................3-14
3-2. RF ......................................................................................................................3-13
3-2-1. EGSM RX ..................................................................................................3-17
3-2-2. DCS RX .....................................................................................................3-19
3-2-3. PCS RX ......................................................................................................3-21
3-2-4. EGSM TX ...................................................................................................3-22
3-2-5. DCS/PCS TX .............................................................................................3-24
Contents
4. Array course control
4-1. Downloading Binary Files ......................................................................................4-1
4-2. Pre-requsite for Downloading ................................................................................4-1
4-3. S/W Downloader Program .....................................................................................4-2
4-4. How to Download ...................................................................................................4-2
5. Block Diagrams
5-1. RF Solution Block Diagram ......................................................................................5-1
5-2. Base Band Solution Block Diagram .........................................................................5-2
6. PCB Diagrams
7. MAIN Electrical Parts List
8. Reference data
8-1. Reference Abbreviate ..............................................................................................8-1
9. Safety Precautions
9-1. Repair Precaution ......................................................................................................9-1
9-2. ESD(Electrostaically Sensitive Devices) Precaution ................................................9-2
10. Product Function
1. Specification
1-1. GSM General Specification
EGSM900 DCS1800 PCS1900
F req. Ban d[MHz] 8 80~ 915 17 10~ 178 5 185 0~1 910
Up lin k/D own lin k 9 25~ 960 18 05~ 188 0 193 0~1 990
0~ 12 4&
ARF CN rang e 5 12~ 885 51 2~8 10
97 5~ 102 3
Tx/Rx spaci ng 45 MHz 95 MHz 80 MH z
270 .8 33 Kb ps 270 .8 33 Kb ps 2 70.83 3 Kbp s
GPRS
3.692 us 3.692 us 3 .6 92 u s
M od . B i t ra te /
Bit Period
81 2.5 Kbp s 81 2.5 Kbp s 812 .5 Kbps
EDGE
3.692 us 3.692 us 3 .6 92 u s
T ime Slot Peri od/F rame 576 .9 us 576 .9 us 5 76.9 u s
Period 4.61 5 m s 4.61 5 m s 4.615 ms
G PRS 0 .3 GMSK 0 .3 GMSK 0. 3 G MSK
Modu latio n
EDGE 8 PSK 8 PSK 8 PSK
GPRS 3 3 dBm~ 5 d Bm 3 0 dBm~ 0 d Bm 30 dBm~ 0 dBm
MS Power
ED GE 27 ~5 dBm 26 ~0 dBm 26~ 0 d Bm
G P RS 5~19(class4) 0~15(class1) 0~15(class1)
Powe r Leve l
ED GE 8~ 19(cl ass E 2) 2~15(class E2) 2~15(class E2)
Sensi ti vity -1 02 d Bm -1 00 d Bm -10 2 dBm
TDMA Mux 8 8 8
C ell Rad ius 35 Km 2 Km 2 Km
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 TX TX
Power Power Power PCS1900
control EGSM900 control DCS1800 control
level level level
5 33