LG LGC-500W Service Manual
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LG LGC-500W Service Manual

LG LGC-500W Service Manual

Cdma portable cellular phone
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Download this manual See also: Operator's Manual
CDMA PORTABLE CELLULAR PHONE
LGC-500W
SERVICE MANUAL
LGIC
LG Information & Communications, Ltd.

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Summary of Contents for LG LGC-500W

  • Page 1 CDMA PORTABLE CELLULAR PHONE LGC-500W SERVICE MANUAL LGIC LG Information & Communications, Ltd.

  • Page 2: Table Of Contents

    2. Block & Circuit Diagram 3. Component Layout 4. Part List 5. Accessories - Desktop Charger - Travel Charger - Cigar Lighter Charger - Hands Free Kit 6. WLPST ( LGIC Product Support Tool For Win95 ) LGIC LG Information & Communications, Ltd.
  • Page 3 - IS-99 : Short Message Service, Asynchronous Data Service, and G3 Fax Service LGC-500W is composed of a transceiver, a desktop charger, two Li-Ion Batteries (1650mAh), a hands-free kit, a travel charger. In digital mode, the hands-free kit is designed to operate in full duplex.

  • Page 4: System Introduction

    Multiple access techniques are used to share the available channel resources(frequency bandwidth). Frequency Division Multiple Access(FDMA), Time Division Multiple Access(TDMA), Code Division Multiple Access(CDMA) are the three major techniques in cellular systems. LGIC LG Information & Communications, Ltd.
  • Page 5 Old-fashioned radio receivers separate stations or channels by filtering in the frequency domain. CDMA receivers do not eliminate analog processing entirely, but they separate communication channels by means of a pseudo-random modulation that is applied and removed in the digital domain, not on the basis of LGIC LG Information & Communications, Ltd.
  • Page 6 Reducing the number of sites needed to support any given amount of traffic Simplifying site selection Reducing deployment and operating costs because fewer cell sites are needed Reducing average transmitted power Reducing interference to other electronic devices Reducing potential health risks LGIC LG Information & Communications, Ltd.

  • Page 7: Features And Advantages Of Cdma Mobile Phone (For Amps As Well)

    Moreover, the backward closed loop power control used by the mobile station to control power with the commands issued out by the cell site. The cell site receives the signal of each corresponding mobile station and LGIC LG Information & Communications, Ltd.
  • Page 8 The call conversion is carried out through the original call connection cell site, both cell sites, and then, new cell site. This method do not change frquency , so minimize call disconnection and prevent the user from detecting the hand-off. LGIC LG Information & Communications, Ltd.
  • Page 9 In addition, in the CDMA system, services and service charges are classified further into different classes so that more transmit power can be allocated to high class service users for easier call set-up; they can also be given higher priority of using hand-off function than the general users. LGIC LG Information & Communications, Ltd.

  • Page 10: Structure And Functions Of Cdma Mobile Phone (For Amps As Well)

    (AGC Amp). Then, they are converted into RF band by the frequency synthesizer synchronizing these signals to proper output frequencies. Transmit signals obtained pass through the duplexer filter and then, are sent out to the cell site via the antenna. LGIC LG Information & Communications, Ltd.

  • Page 11: Specification

    1) CDMA : 1.25MHz 2) AMPS : 30KHz 4.1.10 Battery Type, Capacity and Orerating Time. Unit = Hours : Minutes Option Standard (1400mA) (900mA) 240 Hrs 140 Hrs CDMA Stand-By Time AMPS 25 Hrs 15Hrs LGIC LG Information & Communications, Ltd.
  • Page 12 +2.9kHz peak frequency deviation. 4.2.10 AMPS Sensitivity : 12dB SINAD/-116dBm 4.2.11 AMPS Intermodulation Spurious Response Attenuation : Above 65dB 4.2.12 AMPS RSSI Range : Above 60dB 4.2.13 AMPS Protection Against Spurious Response Interference : Above 60dB LGIC LG Information & Communications, Ltd.
  • Page 13 4.3.6 AMPS Carrier ON/OFF Conditions “ ON” condition : within +3dB of specification output (in 2mS) 4.3.7 AMPS Compressor • Compression Rate : 2:1 • Attack Time : 3mS • Recovery Time : 13.5mS LGIC LG Information & Communications, Ltd.
  • Page 14 4.3.12 CDMA TX Frequency Deviation : +300Hz or less 4.3.13 CDMA TX Conducted Spurious Emissions • 900kHz : - 42 dBc/30kHz below • 1.98MHz : - 54 dBc/30kHz below 4.3.14 CDMA Minimum TX Power Control : - 50dBm below LGIC LG Information & Communications, Ltd.
  • Page 15 890.910 MHz 879.480 MHz 892.140 MHz 880.890 MHz 893.370 MHz 4.6 Desktop Charger : See Appendix 4.7 Travel Charger : See Appendix 4.8 Cigar Lighter Charger : See Appendix 4.9 Hands-Free Kit : See Appendix LGIC LG Information & Communications, Ltd.

  • Page 16: Installation

    IB bracket with the four self-tapping screws provided. Clip the IB into the IB bracket. 5.3.4. Microphone Installation Install the microphone either by cliiping I onto the sunvisor (driver’s side) or by attaching it to door post (driver’s side), using a velcno adhesive tape (not included). LGIC LG Information & Communications, Ltd.
  • Page 17 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.) LGIC LG Information & Communications, Ltd.

  • Page 18: Chapter 2. Nam Input Method(Inputting Of Telephone Numbers Included)

    • Edit ESN(if you want, but not recommended) , then press [OK]. NAM 1 PHONE NUMBER • Enter the phone number, then press [OK]. NAM 1 HOME SID • Edit NAM 1 HOME SID, then press [OK]. LGIC LG Information & Communications, Ltd.
  • Page 19 NAM 1 CDMA HOME SID 4 NAM 1 CDMA HOME NID 4 NAM 1 AMPS PHONE NUMBER NAM 1 AMPS HOME SID PHONE MODEL SLOT CYCLE INDEX ¡ Ø Editing this items is not recommended. LGIC LG Information & Communications, Ltd.

  • Page 20: Chapter 3. Circuit Description

    Dupl VC - 19.68M Hz exer Tcxo 19.68M Hz LNA_Range SYNTH_LOCK Tank IFR3000 Down CDMA IF SAW Filter RX RF Mixer Filter DFM IF SAW Filter [Figure 1-1] Block Diagram of RF Transmit/Receive Part LGIC LG Information & Communications, Ltd.
  • Page 21 IF signals that have selected the FM path are inputed to FM IF BPF(F8) for FM through the FM path. IF signals that have selected the CDMA path are passed CDMA IF saw filter(F6) and then, are inputed to IFR3000. LGIC LG Information & Communications, Ltd.
  • Page 22 IF center frequency. The I/Q down converter outputs the CDMA I and Q signals haing the bandwidth of 1kHz ~630kHz through CDMA LPF. The use of LPF in IFR3000 suppresses spurious signals entering the receiver in order to improve the CDMA baseband signal selectivity. LGIC LG Information & Communications, Ltd.
  • Page 23 FM analog I and Q baseband components are converted to digital FM(DFM) signals by two 8-bit ADCs. The FM ADCs’ outputs are inputted into MSM3000 through RXIFMDATA and RXQFMDATA terminals. LGIC LG Information & Communications, Ltd.
  • Page 24 OUT+ and OUT- of IFT3000 and mixes the output of Dual PLL Module with UHF output signal. Upconverter’s output operation range is 800MHz~960MHz (RF frequency) and has the conversion gain of 5 dB. In addition, the suppression of spurious signals which are unwanted noise(885kHz offset) is about -50 dBc when LGIC LG Information & Communications, Ltd.
  • Page 25 The maximum power of that can be inputted is 5W (Max) and IL is 0.65dB (Max). Input/output separation is at least 15dB (Min). LGIC LG Information & Communications, Ltd.
  • Page 26 PIN3 are inputted into IFR after going through the VRACTOR diode and tank circuit so that the outputs of IFR internal receive end VCO are adjusted to 170.76MHz. PLL that generates the LO frequency of a mobile station have good spurious characteristics (ref. supurious at 30kHz from carrier = -70dBc (Max)). LGIC LG Information & Communications, Ltd.

  • Page 27: Digital/Voice Processing Part

    The power supply part is made up of 5 Regulators and direct connet to Batt. Regulator(150mA )s give the power each Circuits(TX chain, RX chain, IFT and ITR, Codec). Regulator(200mA) gives the power MSM and memory . PAM, Motor, LED is directly conneted to Batt. LGIC LG Information & Communications, Ltd.
  • Page 28 These signals are amplified with programmable gain on codec’s internal AMP and transferred to the ear piece. Then, the signals of ringer activate the ringer is generated in MSM3000 and drive the ringer circuit(Q10, Q11). LGIC LG Information & Communications, Ltd.
  • Page 29 During the phone is on operating state, LDO for MSM is always enable and gives the power MSM and memory part LDO for IFT_IFR are always enable and gives the power IFT, IFR and VC-TCXO. LGIC LG Information & Communications, Ltd.
  • Page 30 LCD MODULE LCD module contains a controller which will display the information onto the LCD by 8-bit data from the MSM. It has a black and white full graphic 112(W) ¥ ¹ 64(H) dots LGIC LG Information & Communications, Ltd.

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