LG LGC-500W, Service Manual

Page 1: ...LGIC LG Information Communications Ltd CDMA PORTABLE CELLULAR PHONE LGC 500W SERVICE MANUAL ...

Page 2: ...as well 4 Specification 5 Installation CHAPTER 2 NAM Input Method Inputting of telephone numbers included 1 Telephone Number and NAM Programming Method CHAPTER 3 Circuit Description 1 RF Transmit Receive Part 2 Digital Voice Processing Part Appendix 1 Assembly and Disassembly Diagram 2 Block Circuit Diagram 3 Component Layout 4 Part List 5 Accessories Desktop Charger Travel Charger Cigar Lighter C...

Page 3: ...ies 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 IS 95A Common Air Interface MS meets the specifications of the be...

Page 4: ...alled channel assignment stategy In the cellular system the channel handoff operation is inevitably needed to keep a call while a user moves one cell to another This function not only involves identifying a new base station but also eruires that the voice and control signals be allocated to channel associated with new base station The handoff between different swithcing systems is called roaming I...

Page 5: ... the winners of the United States Personal Communications System spectrum auctions It may seem however mysterious for those who aren t familiar with it This site is provided in an effort to dispel some of the mystery and to disseminate at least a basic level of knowledge about the technology CDMA is a form of spread spectrum a family of digital communication techniques that have been used in milit...

Page 6: ...ephone traffic Erlang capacity l Dramatically improving the voice quality and eliminating the audible effects of multipath fading l Reducing the incidence of dropped calls due to handoff failures l Providing reliable transport mechanism for data communications such as facsimile and internet traffic l Reducing the number of sites needed to support any given amount of traffic l Simplifying site sele...

Page 7: ...ality calls In case the originating signals of mobile stations are received by the cell site in the minimum call quality level signal to interference through the use of transmit power control on all the mobile stations the system capacity can be maximized If the signal of mobile station is received too strong the performance of that mobile station is improved However because of this the interferen...

Page 8: ...e transmission is possible under the environment experiencing serious noise In addition in case the caller does not talk data transmission rate is reduced so that the transmission is carried out in low energy This will reduce the interference on other CDMA signals and as a result improve system performance capacity increased by about two times 2 4 Protecting Call Confidentiality CDMA signals have ...

Page 9: ...e cell normally uses a 120 Æ sector antenna in order to divide the sector into three In this case each antenna is used only for 1 3 of mobile stations in the cell site and accordingly interference is reduced by 1 3 on the average and the capacity that can be supported by the entire system is increased by three times 2 7 Soft Capacity The subscriber capacity of CDMA system is flexible depending on ...

Page 10: ...dulated in order to obtain the sequence of encoded data symbols During the operation with one cell site the searcher searches out multi paths in accordance with terrain and building reflections On three data receivers the most powerful four paths are allocated for the parallel tracing and receiving Fading resistance can be improved a great deal by obtaining the diversity combined output for de mod...

Page 11: ...3 mA 103 mA 740 mA 24 dBm AMPS 99 mA 845 mA 28 dBm 4 1 5 Operating Temperature 30 60 4 1 6 Frequency Stability 1 CDMA 0 5PPM 2 AMPS 2 5PPM 4 1 7 Antenna Retractable Type Herical Whip 50 Ω 4 1 8 Size and Weight 1 Size 120 5 47 3 5 27 Batt STD 120 5 47 3 5 23 2 Batt Option 2 Weight 140 150g Batt STD 120 130g Batt Option 4 1 9 Channel Spacing 1 CDMA 1 25MHz 2 AMPS 30KHz 4 1 10 Battery Type Capacity a...

Page 12: ...z 30dBm 2 AMPS 16dB at Fch 30kHz 60 dB at Fch 60kHz 4 2 6 Spurious Wave Suppression Maximum of 80dB 4 2 7 CDMA Input Signal Range Dynamic area of more than 104 25 dB 79dB at the 1 23MHz band 4 2 8 AMPS DE Emphasis 6dB OCT within 0 3 3kHz 4 2 9 AMPS Expander 1 Expansion Rate 1 2 2 Attack Time within 3mS 3 Recovery Time within 13 5mS 4 Reference Input Output level to a 1000Hz tone from a carrier wit...

Page 13: ... 45 dBm 41 dBm 41 32 dBm 32 dBm 32 26 dBm 21 dBm 4 3 Transmit Specification 4 3 1 Frequency Range 1 Digital 824 820MHz 848 190MHz 2 Analog 824 04MHz 848 97MHz 4 3 2 Local Oscillating Frequency Range 966 88 MHz 12 5 MHz 4 3 3 Intermediate Frequency 130 38 MHz 4 3 4 Output Power 1 CDMA 0 32W 2 AMPS 0 6W 4 3 5 Interference Rejection 1 Single Tone 30dBm at 900 kHz 2 Two Tone 43dBm at 900 kHz 1700kHz 4...

Page 14: ...bove 40LOG F 3000 dB Over 15kHz above 28dB 4 3 10 AMPS Spectrum Noise Suppression For all Modulation fo 20kHz fo 45kHz above 26dB For Modulation by Voice and SAT fo 45kHz above 63 10LOG Py dB For Modulation by WBD without SAT and ST with SAT fo 45kHz fo 60kHz above 45dB fo 60kHz fo 90kHz above 65dB fo 90kHz 2fo above 63 10LOG Py dB where fo carrier frequency Py mean output power in watts 4 3 11 AM...

Page 15: ...z 843 270 MHz 844 500 MHz 845 910 MHz 847 140 MHz 848 370 MHz 4 5 MS Mobile Station Receiver Frequency FA NO CH NO CENTER FREQUENCY FA NO CH NO CENTER FREQUENCY 1 2 3 4 5 6 7 8 9 10 1011 29 70 111 152 193 234 275 316 363 869 640 MHz 870 870 MHz 872 100 MHz 873 330 MHz 874 560 MHz 875 790 MHz 877 020 MHz 878 250 MHz 879 480 MHz 880 890 MHz 11 12 13 14 15 16 17 18 19 20 404 445 486 527 568 609 650 6...

Page 16: ...re that the speaker and microphone are not facing each other and keep microphone a generous distance from the speaker 5 3 2 Cradle Installation Choose an appropriate flat surface where the unit will not interface with driver s movement or passenger s comfort The driver user should be able to access the phone with ease Using the four self tapping screws provided mount the supplied braket on the sel...

Page 17: ... the car ground Connect the green wire to the car ignition sensor terminal In order to operate HFK please make sure to connect green wire to ignition sensor terminal Connect the kit s power cable connector to the interface box power receptacle 5 3 5 2 Antenna Cable Connection Connect the antenna coupler cable connector from the cradle to the external antenna connector Antenna is not included ...

Page 18: ...eared Press 1 to program the telephone number and NAM Select one NAM the registration requires NAM1 as default Edit ESN if you want but not recommended then press OK Enter the phone number then press OK Edit NAM 1 HOME SID then press OK CHAPTER 2 NAM Input Method Inputting of telephone numbers included 1 NAM 1 2 NAM 2 3 NAM 3 4 NAM 4 1 Prog Mode 2 Pref Mode 3 ER Mode 4 PRL ESN NAM 1 PHONE NUMBER N...

Page 19: ...n effort to move to the next screen To return to the last item press the left arrow 3 The editable NAM items are followed SERVICE SEC CODE NAM 1 LOCK_OUT SYSTEM 1 NAM 1 CDMA PHONE MUNBER NAM 1 MOBILE COUNTRY CODE NAM 1 MOBILE NETWORK CODE NAM 1 MOBILE STATION ID NAM 1 CDMA HOME SID 1 NAM 1 CDMA HOME NID 1 NAM 1 CDMA HOME SID 2 NAM 1 CDMA HOME NID 2 NAM 1 CDMA HOME SID 3 NAM 1 CDMA HOME NID 3 NAM 1...

Page 20: ...MSM Mobile Station Modem of the digital circuit part Then they are demodulated by the modulator demodulator In the case of transmission IFT receives modulated digital signals from the MSM of the digital circuit and then changes them into analog signals by the digital analog converter DAC D A Converter in order to create baseband signals Created baseband signals are changed into IF signals by IFT a...

Page 21: ...ency active gain DOWN mixer U14 RF signals 869 04 893 97 MHz received from the Duplexer are amplified after obtaining the gain of 19dB through the LNA Then they are passed through the BPF At this time about 3dB IL is generated The output signals are fed to the mixer input terminal U14 4 The mixer synchronizes the RF signals with local oscillating signal that has been inputted to the local input te...

Page 22: ... converters With its CDMA_IF and CDMA_IF terminals the IFR3000 receives two IF signals that have been modulated CDMA Spreading Power Density Modulation extending 630kHz from 85 38MHz Center Frequency The Rx AGC amplifiers or attenuates the received CDMA IF signal to provide a constant amplitude signal to the I Q downconverter This type of gain control is the power adjustment function to reduce the...

Page 23: ... channel The IF center frequency is same as the CDMA IF center frequency 85 38MHz The RX AGC amplifier interface with the IF subsystem of the subscriber unit The Rx AGC either amplifiers or attenuates the received FM IF signal to provide a constant amplitude Constant amplitude signals go through the I Q downconverter The AGC amplifier conditions the received IF signal to optimize between low IF ou...

Page 24: ...entered at 130 38MHz IF frequency A temperature compensated Tx AGC amplifier with 84dB gain range is included in the IFT3000 The transmit output power level of the subscriber unit is directly controlled by varying the gain of this Tx AGC amplifier A PDM output from the MSM3000 s TX_AGC_ADJ pin is RC low pass filtered and turned to a DC voltage level This voltage level linearly controls the gain of...

Page 25: ...ier and Isolator The power amplifier P1 that can be used in the CDMA and FM mode has linear amplification capability whereas in the FM mode it has a high efficiency For higher efficiency it is made up of one MMIC Monolithic Microwave Integrated Circuit for which RF input terminal and internal interface circuit are integrated onto one IC after going through the AlGaAs GaAs HBT heterojunction bipola...

Page 26: ...tted to PLL U8 is 19 68MHz It is the dual mode frequency synthesizer PLL that can synthesize frequencies band 954MHz 980MHz and IF oscilation frequency 170 76MHz PLL that receives the reference frequency of 19 68MHz from VC TCXO creates the phase detect frequency of 30kHz with the use of internal program and then changes the frequency of 900MHz band And then two signal differences are calculated f...

Page 27: ...s and sends out voice and data with external sources 2 2 2 Voice Processing Part The voice processing part is made up of an audio codec used to convert MIC signals into digital voice signals and digital voice signals into analog voice signals amplifying parts for amplifying the voice signals and MIC signals are on Codec 2 2 3 MSM3000 Mobile Station Modem Part MSM3000 is the core elements of a CDMA...

Page 28: ...sources and then receives power from the battery or external batteries 2 3 2 Audio Processing Part MIC signals are inputted into the audio codec and amplified with programmable gain 2dB step and converted into digital signals PCM Then they are inputted into MSM3000 In addition digital audio signals PCM outputted from MSM3000 are converted into analog signals after going through the audio codec The...

Page 29: ...en received I and Q data are demodulated into symbols by the demodulator and then de interleaved in reverse to the case of transmission Then the errors of data received from Viterbi decoder are detected and corrected They are voice decoded at the vocoder in order to output digital voice data The MSM3000 also supports Enhanced Variable Rate Coder EVRC operation in addition to the standard 8k and 13...

Page 30: ...MA and the FM mode The major components are as follows CPU ARM7TDMI core MEMORY FLASH Memory 16M bits STATIC RAM 4M bits EEPROM 265kbits CPU ARM7TDMI 32 bit microprocessor is used and CPU controls all the circuitry Some of the features of the ARM microprocessor include a 3 stage pipelined RISC architecture both 32 bit ARM and 16bit THUMB instruction setsm a 32 bit address bus and a 32 bit internal...