3
The LG-UD90C cellular phone functions as digital cellular phone worked in CDMA (Code Division
Multiple Access) mode.
CDMA mode applies the DSSS (Direct Sequence Spread Spectrum) technique that has been used in
military. This technique enables to share one frequency channel with many users in the same specific
area. As a result, that it increases the capacity 10 times more compared with that in the analog mode
(AMPS) currently used.
Soft/Softer Handoff, Hard Handoff, and Dynamic RF power Control technologies are combined into
this phone to reduce the call being interrupted in a middle of talking over phone.
CDMA digital cellular network consists of MSC (Mobile Switching Office), BSC (Base Station
Controller), BTS (Base station Transmission System), and MS (Mobile Station). Communication
between MS and BTS is designed to meet the specification of CDMA2000 1X (Common Air Interface).
MS meets the specifications of the below :
CDMA Standard
Designator
Description
Basic air interface
TIA/EIA/IS-95-A/B/C
ANSI J-STD-008
Protocol between MS and BTS for Cellular &
AMPS Protocol between MS and BTS for PCS
Network
TIA/EIA/IS-634
TIA/EIA/IS/651
TIA/EIA/IS-41-C
TIA/EIA/IS-124
MAS-BS
PCSC-RS
Intersystem operations
Nom-signaling data comm.
Service
TIA/EIA/IS-96-B
TIA/EIA/IS-99
TIA/EIA/IS-637
TIA/EIA/IS-657
Speech CODEC
Assign data and fax
Short message service
Packet data
Performance
TIA/EIA/IS-97
TIA/EIA/IS-98 ANSI
J-STD-018 ANSI
J-STD-019
TIA/EIA/IS-125
Cellular base station
Cellular mobile station
PCS personal station
PCS base station
Speech CODEC
General Introduction
Z3X-BOX.COM
Содержание LG-UD90c
Страница 1: ...CDMA PORTABLE CELLULAR PHONE LG UD90c SERVICE MANUAL Z 3 X B O X C O M ...
Страница 20: ...LG KG90C 20 LG UD90C MAIN TOP LG UD90C MAIN BOTTOM CHAPTER 4 Trouble Shooting Z 3 X B O X C O M ...
Страница 22: ...LG KG90C 22 Circuit Diagram Test Point 2 6V_MSMP PS_HOLD 1 85V_MSMC U1303 MAX1827 Z 3 X B O X C O M ...
Страница 23: ...LG KG90C 23 Waveform TCXO TCXO_OUTPUT X1100 Z 3 X B O X C O M ...
Страница 25: ...LG KG90C 25 Test Point Waveform CON601 No 18 19 2 8V_L 2 65V_MSMP U3100 Vout_BL Z 3 X B O X C O M ...
Страница 27: ...LG KG90C 27 Test Point Circuit Diagram CON3100 X3100 X3100 pin3 Z 3 X B O X C O M ...
Страница 29: ...LG KG90C 29 Test Point Circuit Diagram Mic R211 Mic bias resistor MSM6100 Z 3 X B O X C O M ...
Страница 30: ...LG KG90C 30 5 When Receiver Earpiece isn t heard Checking Flow Z 3 X B O X C O M ...
Страница 31: ...LG KG90C 31 Test Point Circuit Diagram R3000 R3001 U1409 Z 3 X B O X C O M ...
Страница 33: ...LG KG90C 33 Test Point Circuit Diagram MOTOR_EN TP3001 Motor pad Z 3 X B O X C O M ...
Страница 35: ...LG KG90C 35 Test Point Circuit Diagram U2001 Z 3 X B O X C O M ...
Страница 37: ...LG KG90C 37 Test Point Circuit Diagram CON2000 Z 3 X B O X C O M ...
Страница 39: ...LG KG90C 39 Test Point Circuit Diagram Blue Tooth ANT U2000 Z 3 X B O X C O M ...
Страница 41: ...LG KG90C 41 Test Point Circuit Diagram U1409 U1403 CON 1401 U1401 Z 3 X B O X C O M ...
Страница 42: ...LG KG90C 42 11 When Tx power isn t good enough Checking Flow Test Point Z 3 X B O X C O M ...
Страница 43: ...LG KG90C 43 Circuit Diagram U1107 U1106 X1100 U1101 Z 3 X B O X C O M ...
Страница 44: ...LG KG90C 44 Waveform Z 3 X B O X C O M ...
Страница 46: ...LG KG90C 46 Test Point Circuit Diagram U1107 U1101 X1100 Z 3 X B O X C O M ...
Страница 66: ...Z 3 X B O X C O M Rx Pass Rx Path Tx Path MIC Path Speaker voice mp3 MIDI RX 824Mhz 849Mhz TX 869Mhz 894Mhz ...
Страница 67: ...Z 3 X B O X C O M ...
Страница 68: ...Z 3 X B O X C O M R1335 R1336 47K 10k변경 5 1 일 R1356 R1357 DNI 560k R1317 DNI 200K 변경 5 1일 ...
Страница 69: ...Z 3 X B O X C O M L1404 L1405 220n 1K 1608 R1434 R1437 10k 1K 1005 R1436 R1435 10k 56k 1005 변경 5 1일 MIDI ...
Страница 70: ...Z 3 X B O X C O M C1510 100n 0 1uF 변경 5 1일 ...
Страница 71: ...Z 3 X B O X C O M ...
Страница 72: ...Z 3 X B O X C O M ...
Страница 73: ...Z 3 X B O X C O M C2010 10n 6 8n 5 1일 변경 ...
Страница 74: ...Z 3 X B O X C O M ...
Страница 77: ...Z 3 X B O X C O M U3100 Charge pump Not LCD backlight on ...
Страница 79: ...Z 3 X B O X C O M M2001 Microphone MIC not work ...
Страница 81: ...Z 3 X B O X C O M U4009 Touch sensor Touch key not work ...
Страница 82: ...Z 3 X B O X C O M ...