Text preview for : Samsung SGH-i780 service manual.pdf part of Samsung SGH-i780 service manual Samsung GSM Samsung SGH-i780 service manual.pdf
Back to : Samsung SGH-i780 service | Home
GSM TELEPHONE
SGH-i780
GSM TELEPHONE CONTENTS
1. Safety Precautions
2. Specification
3. Product Function
4. Array course control
5. Exploded View and Parts List
6. Main Electrical Parts List
7. Block Diagrams
8. PCB Diagrams
9. Flow Chart of Troubleshooting
10. Reference data
11. Disassembly and Assembly
Instructions
GSPN (Global Service Partner Network)
Country Web Site
North America service.samsungportal.com
Latin America latin.samsungportal.com
CIS cis.samsungportal.com
Europe europe.samsungportal.com
China china.samsungportal.com
Asia asia.samsungportal.com
Mideast & Africa mea.samsungportal.com
This Service Manual is a property of Samsung Electronics Co.,Ltd. Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
International and/or domestic law. 2008. 01. Rev.1.0
1. Safety Precautions
1-1. Repair Precaution
Repair in Shield Box, during detailed tuning.
Take specially care of tuning or test, because the specification of cellular phone is sensitive for
surrounding interference(RF noise).
Be careful to use a kind of magnetic object or tool, because performance of parts is damaged by
the influence of magnetic force.
Surely use a standard screwdriver when you disassemble this product, otherwise screw will be
worn away.
Use a thicken twisted wire when you measure level.
A thicken twisted wire has low resistance, therefore error of measurement is few.
Repair after separate Test Pack and Set because for short danger (for example an overcurrent
and furious flames of parts etc) when you repair board in condition of connecting Test Pack and
tuning on.
Take specially care of soldering, because Land of PCB is small and weak in heat.
Surely tune on/off while using AC power plug, because a repair of battery charger is dangerous
when tuning ON/OFF PBA and Connector after disassembling charger.
Don't use as you pleases after change other material than replacement registered on SEC System.
Otherwise engineer in charge isn't charged with problem that you don't keep this rules.
1-1
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Safety Precautions
1-2. ESD(Electrostatically Sensitive Devices) Precaution
Several semiconductor may be damaged easily by static electricity. Such parts are called by ESD
(Electrostatically Sensitive Devices), for example IC,BGA chip etc. Read Precaution below.
You can prevent from ESD damage by static electricity.
Remove static electricity remained your body before you touch semiconductor or parts with
semiconductor. There are ways that you touch an earthed place or wear static electricity prevention
string on wrist.
Use earthed soldering steel when you connect or disconnect ESD.
Use soldering removing tool to break static electricity. Otherwise ESD will be damaged by static
electricity.
Don't unpack until you set up ESD on product. Because most of ESD are packed by box and
aluminum plate to have conductive power,they are prevented from static electricity.
You must maintain electric contact between ESD and place due to be set up until ESD is
connected completely to the proper place or a circuit board.
1-2
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
2. Specification
2-1. GSM General Specification
EG SM 900 DCS 1800 PCS 190 0 W- CDMA 2100
F r eq. Ban d[MHz] 8 80~ 915 17 10~ 178 5 1 850 ~1 910 1 920 ~19 80
Up lin k/D own lin k 9 25~ 960 18 05~ 188 0 1 930 ~1 990 2 110 ~21 70
0~1 24 & UL :9 612 ~9 888
ARF CN r ang e 5 12~ 885 512 ~8 10
97 5~ 102 3 DL:10 562 ~1 083 8
Tx/Rx s paci ng 45 M Hz 95 MHz 80MH z 1 90MH z
Mod. Bit r ate/ 2 70.83 3kbp s 2 70.83 3kbp s 27 0.833 kbps 3 .8 4M c ps
B i t Pe r i o d 3.69 2us 3.69 2us 3 .6 92u s (chip r ate)
Time Slot Period 57 6.9us 57 6.9us 5 76.9u s F r ame len gth : 10ms
/ Frame Period 4.61 5ms 4.61 5ms 4.615 ms Slot le ngth : 0.66 7ms
QPSK (DL)
Mo dul ation 0.3GMSK 0.3GMSK 0.3GMSK
HPSK (UL)
MS Po wer 3 3dBm ~ 5d Bm 3 0dBm ~ 0d Bm 30 dBm ~ 0 dBm 24 dBm ~ -50d Bm
4 1 1 3
P ow er Cl as s
(max +33dBm) (max +30dBm) (max +30dBm) (max +24dBm)
Sen sitivity - 1 02d Bm -1 00d Bm -10 0dBm - 1 06.7d Bm
TDMA Mux 8 8 8
C ell Rad ius 3 5K m 2Km 2K m 2Km
2-1
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Specification
2-2. GSM TX power class
TX Power GSM900 TX Power DCS1800 TX Power
control level control level control level PCS1900
5 33