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LG-TM250

3. When Tx Audio (MIC) isn't transmitted.

START

MIC

contacting

No

Contact MIC

MIC is out

of order?

Change MIC

Check Mic Bias

Volt of R206 &

4 pin of

U407 is

Check U201 & U407

Mic filter

Network

Check, Resoldering

Mic filter Network

Yes

Yes

Yes

No

No

No

Change Main B’d

LG Electronics Inc.

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Summary of Contents for KV230

Page 1: ...rrent Value of Termination Part Amplifier Catalogue included MODE Part Name Voltage Current Power CELLULAR CX77105 4 0V 600mA 0 20W PCS CX77107 4 0V 700mA 0 20W 6 Functions of Major Semi Conductors Classification Function MSM6050 FBGA Terminal operation control and digital signal processing MCP TH50VPF5585ADSB Flash Memory 32Mbit SRAM 32Mbit Storing of terminal operation program RFR6000 Converts R...

Page 2: ...LG TM250 CDMA Mobile Subscriber Unit LG TM250 SERVICE MANUAL Tri Band Tri Mode PCS GPS Cellular CDMA Mobile Phone LG Electronics Inc 2 ...

Page 3: ...f Tri band CDMA Mobile Phone 9 4 Specification 10 5 Installation 18 CHPATER 2 NAM Input Method 1 NAM Program Method and Telephone Number Inputting Method 20 CHAPTER 3 Circuit Description 1 RF Transmit Receive Part 24 2 Digital Voice Processing Part 29 CHAPTER 4 Trouble Shooting 38 CHAPTER 5 Safety 44 CHAPTER 6 Glossary 47 CHAPTER 7 How to Download APPENDIX 60 LG Electronics Inc 3 ...

Page 4: ...tly 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 the phone Cellular and PCS CDMA network consists of MSO Mobile Switching Office BSC Base Station Controller BTS Base station Transmission System and MS Mobile Station The following table lists some major CDMA Standards CDM...

Page 5: ...ted environment It can process more number of subscribers compared to other systems TDMA system has the processing capacity three times greater than the existing FDMA system whereas CDMA system about 12 15 times of that of the existing system CDMA system can be explained as follows TDMA or CDMA can be used to enable each person to talk alternately or provide a separate room for each person when tw...

Page 6: ... on all the mobile stations the system capacity can be maximized If the signal power of mobile station is received too strong the performance of that mobile station is improved However because of this the interference on other mobile stations using the same channel is increased and accordingly the call quality of other subscribers is reduced unless the maximum accommodation capacity is reduced In ...

Page 7: ...alk 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 Voice privercy is provided in the CDMA system by means of the private long code mask used for PN spreading Voice privacy can ve applied...

Page 8: ...cordingly 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 the CDMA system is flexible depending on the relation between the number of users and service classes For example the system operator can increase the number of channels available for use during the busy hour de...

Page 9: ... channel from the cell site most adjacently located is demodulated 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 3 paths are allocated for the parallel tracing and receiving Fading resistance can be improved a great de...

Page 10: ...4 1 4 Battery Power Consumption DC 3 7V SLEEP IDLE MAX POWER CELLULAR 0 8 mA 100 120mA 650 mA 24 dBm PCS 0 8 mA 110 130 mA 750 mA 24 dBm 4 1 5 Operating Temperature 30 C 60 C 4 1 6 Frequency Stability 1 CDMA 0 5PPM 2 PCS 0 1PPM 4 1 7 Antenna Stubby Type Helical Meander 50 Ω 4 1 8 Size and Weight 1 Size 80 44 22 8 mm 2 Weight 88 g Approximately with standard battery 4 1 9 Channel Spacing 1 CELLULAR...

Page 11: ... PCS 1715 56 MHz 1768 89 MHz 3 GPS 3150 84 MHz 4 2 3 Sensitivity 1 CELLULAR 104dBm C N 12dB or more 2 PCS 104dBm C N 12dB or more 3 GPS 148 5dBm 4 2 4 Selectivity 1 CELLULAR 3dB C N Degration With Fch 1 25 kHz 30dBm 2 PCS 3dB C N Degration With Fch 1 25 kHz 30dBm 4 2 5 Interference Rejection 1 Single Tone 30dBm at 900 kHz CELLULAR 30dBm at 1 25MHz PCS 2 Two Tone 43dBm at 900 kHz 1700kHz CELLULAR 4...

Page 12: ... 30kHz below 1 98MHz 54 dBc 30kHz below 2 PCS 42 dBc 30KHz below 4 3 5 CDMA Minimum TX Power Control 1 CELLULAR 50dBm below 2 PCS 50dBm below 4 4 MS Mobile Station Transmitter Frequency 4 4 1 CELLULAR mode Ch Center Freq MHz Ch Center Freq MHz 1011 29 70 111 152 193 234 275 316 363 824 640 825 870 827 100 828 330 829 560 830 790 832 020 833 250 834 480 835 890 404 445 486 527 568 609 650 697 738 7...

Page 13: ...025 1901 25 250 1862 50 650 1882 50 1050 1902 50 275 1863 75 675 1883 75 1075 1903 75 300 1865 00 700 1885 00 1100 1905 00 325 1866 25 725 1886 25 1125 1906 25 350 1867 50 750 1887 50 1150 1907 50 375 1868 75 775 1888 75 1175 1908 75 4 5 MS Mobile Station Receiver Frequency 4 5 1 CELLULAR mode Ch Center Freq MHz Ch Center Freq MHz 1011 29 70 111 152 193 234 275 316 363 869 640 870 870 872 100 873 ...

Page 14: ...5 575 1958 75 975 1978 75 200 1940 00 600 1960 00 1000 1980 00 225 1941 25 625 1961 25 1025 1981 25 250 1942 50 650 1962 50 1050 1982 50 275 1943 75 675 1963 75 1075 1983 75 300 1945 00 700 1965 00 1100 1985 00 325 1946 25 725 1966 25 1125 1986 25 350 1947 50 750 1967 50 1150 1987 50 375 1948 75 775 1968 75 1175 1988 75 4 5 3 GPS mode 1575 42MHz 4 6 Desktop Charger See Appendix 4 7 Travel Charger ...

Page 15: ...yed so it can only fit one way Align the groove in the battery pack with the rail on the back of the phone until the battery pack rests flush with the back of the phone 2 Slide the battery pack forward until you hear a click which locks the battery in place LG Electronics Inc 15 ...

Page 16: ...ing Service Prg Usually pressing Soft Key 1 will save the change To exit Service Program press END key 2 1 ESN You can only see the ESN number Press Soft Key 1 to go next NAM 1 items Press Soft Key 2 to edit A key 2 1 1 A Key You can edit the A Key Press Soft Key 1 to save and go next NAM 1 items Press Soft Key 2 to go previous NAM 1 items LG Electronics Inc 16 ...

Page 17: ...er You can edit NAM1 MIN Press soft key 1 to save and go next NAM 1 items Press soft key 2 to go previous NAM 1 items 2 4 NAM 1 Home SID You can edit NAM1 Home SID Press Soft Key 1 to save and go next NAM 1 items Press Soft Key 2 to go previous NAM 1 items 2 5 NAM 1 Name You can edit NAM 1 Name Press Soft Key 1 to save and go next more NAM 1 items Press Soft Key 2 to go previous NAM 1 items LG Ele...

Page 18: ...y Code Press Soft Key 1 to save and go next NAM 1 items Press Soft Key 2 to go previous NAM 1 items 2 8 NAM 1 MCC You can edit NAM 1 Mobile Country Code Press Soft Key 1 to save and go next NAM 1 items Press Soft Key 2 to go previous NAM 1 items 2 9 NAM 1 True IMSI MCC You can edit NAM 1 True IMSI MCC Press Soft Key 1 to save and go next NAM 1 items Press Soft Key 2 to go previous NAM 1 items LG E...

Page 19: ...ress Soft Key 1 to go next NAM 1 items Press Soft Key 2 to go previous NAM 1 items 2 12 NAM 1 CDMA Directory You can edit NAM 1 CDMA Directory Press Soft Key 1 to save and go next NAM 1 items Press Soft Key 2 to go previous NAM 1 items 2 13 NAM 1 CDMA Home SID NID You can edit NAM 1 Home SID NID Pairs Press Soft Key 1 to save and go next NAM 1 items Press Soft Key 2 to edit NAM 1CDMA Home SID and ...

Page 20: ...A Press Soft Key 1 to save and go next NAM 1 items Press Soft Key 2 to go previous NAM 1 items 2 16 NAM 1 CDMA Pri CH B You can edit NAM 1 CDMA Primary Channel B Press Soft Key 1 to save and go next NAM 1 items Press Soft Key 2 to go previous NAM 1 items 2 17 NAM 1 CDMA Sec CH B You can edit NAM 1 CDMA Secondary Channel B Press Soft Key 1 to save and go next NAM 1 items Press Soft Key 2 to go prev...

Page 21: ...ys Reg You can edit NAM 1Home System Registration Press Soft Key 1 to save and go next NAM 1 items Press Soft Key 2 to go previous NAM 1 items Press Up Down key to choose YES NO 2 20 NAM 1 Forn SID Reg You can edit NAM 1 Foreign SID Registration Press Soft Key 1 to save and go next NAM 1 items Press Soft Key 2 to go previous NAM 1 items Press Up Down key to choose YES NO LG Electronics Inc 21 ...

Page 22: ...ou can only see NAM 1 Access Overload Class Press Soft Key 1 to go next NAM 1 items Press Soft Key 2 to go previous NAM 1 items 2 23 NAM 2 Setting You can decide to edit NAM 2 items Press Soft Key 1 to skip NAM 2 items settings and go next items Press Soft Key 2 to edit NAM 2 related items 2 24 Phone Model You can only see the Phone Model number Press Soft Key 1 to go next items Press Soft Key 2 t...

Page 23: ...LG TM250 2 25 Slot Cycle Index You can edit Slot Cycle Index Press Soft Key 1 to save Slot Cycle Index and exit Service Programming Press Soft Key 2 to go previous items LG Electronics Inc 23 ...

Page 24: ...l by the analog to digital converter ADC A D Converter and the digital circuit part of the MSM Mobile Station Modem 6050 processes the data from ADC The digital processing part is a demodulator In the case of transmission RFT6100 receives OQPSK modulated anlaog signal from the MSM6050 The RFT6100 connects directly with MSM6050 using an analog baseband interface In RFT6100 the baseband quadrature s...

Page 25: ...pass filter BPF and the Tx BPF which has the function of separating Tx and Rx signals in the full duplex system for using the common antenna The Tx part BPF is used to suppress noises and spurious out of the Tx frequency band The Rx BPF is used to receive only Rx signal coming from the antenna which is usually called preselector It s main function is to limit the bandwidth of spectrum reaching the...

Page 26: ...s U111 The RFR6000 device performs signal down conversion for Cellular PCS and GPS tri band applications It contains all the circuitry with the exception of external filters needed to support conversion of received RF signals to baseband signals The three downconverting Mixers Cellular PCS and GPS and an LO Buffer Amplifier to buffer the RF VCO to the RF Transmit Upconverter The GPS LNA mixers off...

Page 27: ...nates the need for a band pass filter normally required between the upconverter and driver amplifier I I Q and Q signals proceed from the MSM6050 to RFT6100 are analog signal In CDMA mode These signals are modulated by Offset Quadrature Phase Shift King OQPSK I and Q are 90 deg out of phase and I and I are 180 deg The mixers in RFT6100 converts baseband signals into RF signals After passing throug...

Page 28: ...s called TRK_LO_ADJ from MSM as 0 5V 2 5V DC via R and C filter in order to generate the reference frequency of 19 2 MHz and input it into the frequency synthesizer Frequency stability depending on temperature is 2 0 ppm 1 4 2 Voltage Controlled Oscillator VCO U140 The external VCO signal is processed by the LO generation and distribution circuits in RFR6000 to create the PCS and Cellular quadratu...

Page 29: ...essing 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 part for amplifying the voice signals and sending them to the ear piece amplifying part that amplifies ringer signals coming out from MSM6050 and amplifying part that amplifies signals coming out from MIC and transf...

Page 30: ...CDMA and Digital FM operating in both the cellular and PCS spectrums The subsystems within the MSM6050 include a CDMA processor a DFM processor a multi standard Vocoder an integrated CODEC with earpiece and microphone amplifiers general purpose ADC for subsytem monitoring an ARM7TDMI microprocessor and both Universal Serial Bus USB and an RS 232 serial interfaces supporting forward and reverse lin...

Page 31: ...art When the battery voltage 3 7V is fed and the PWR key of keypad is pressed Q401 is activated by the ON_SW signal and then the control signal P_EN is generated Based on this P_EN the regulators U403 U404 U407 LDOs for MSM are operated and 1 9V_MSMC 2 8V_MSMP 2 6V_MSMA are generated The Rx part regulator U405 is operated by the control signal SLEEP from MSM6050 The Tx part regulator U401 is opera...

Page 32: ...fter the terminal is fully assembled SRAM is used to store the internal flag information call processing data and timer data KEYPAD For key recognition key matrix is setup using key sense 0 4 signals and GPIO 56 61 of output ports of MSM Nine LEDs and backlight circuitry are included in the keypad for easy operation in the dark LCD MODULE LCD module contains a controller which will display the inf...

Page 33: ...he Q401 Yes Voltage at 3 Pin of Q401 Change the U403 Yes Change the U407 Yes Change the U404 Yes n Voltage at 6 pin of U403 Less than 2 7V n Voltage at 2 3 4 pin of U407 Less than 2 5V Voltage at 2 3 4 pin of U404 Less than 1 8V n Change the D402 Yes Voltage at 1 Pin of D402 n Yes Recharge Battery LG Electronics Inc 33 ...

Page 34: ...n LCD isn t displayed NO YES GOOD LCD Display NO Change LCD FPCB YES LCD display Change LCD START NO YES Check pins of CON404 OR Reconnect CON404 Operating voltage is not supplied in LCD module LG Electronics Inc 34 ...

Page 35: ...ed START MIC contacting No Contact MIC MIC is out of order Change MIC Check Mic Bias Volt of R206 4 pin of U407 is Check U201 U407 Mic filter Network Check Resoldering Mic filter Network Yes Yes Yes No No No Change Main B d LG Electronics Inc 35 ...

Page 36: ...ldering OK Soldering Earpiece between 2 earpiece terminal 32Ω Change Earpiece Yes EJACK_SENSE signal at 4 pin of CON300 is High Check CON300 Earjack No No No Yes Yes Yes Change Main B d Resoldering peripheral circuit of CON404 check volt 4 pin Sinewave appear at pin 23 24 Of CON404 No LG Electronics Inc 36 ...

Page 37: ...n of CON300 is High Yes Yes Yes NO NO NO Yes NO Change Main B d Good Between two Earpiece Change Earpiece Soldering Earpiece Earpiece soldering OK Resoldering peripheral circuit of Keytone wave appear at 23 24pin of CON404 Keytone heard at hand set Supply Power to START LG Electronics Inc 37 ...

Page 38: ...Q406 Yes No Soldering Buzzer No Yes No Buzzer soldering OK Check CON404 FPCB START Rectangular wave appear at base of Q406 Check Paging to Handset with Rectangular wave appear at collector f Q405 Sinewave appear at pin 31 of U17 LG Electronics Inc 38 ...

Page 39: ...the PLL LDO U402 Change the main board Yes Change the RF SAW Filter F150 Yes Tx RF signal appears at C175 Change the Power Amplifier U415 Change the Tx LDO U401 Tx RF signal appears at R572 Yes Yes Change the SP3T switch U520 Tx RF signal appears at C507 Change the stubby antenna or antenna bushing Tx RF signal appears at antenna pad Setup HHP mode with Joyphone Mode Offline d Band Select Mode CDM...

Page 40: ...O U401 Change the PLL LDO U402 Change the Main Board Yes Change the SPDTswitch U521 Yes Tx RF freq appears at C571 Change the Power Amplifier U415 Change the Tx LDO U401 Tx RF freq appears at R572 Yes Yes Change the SP3T switch U520 Tx RF freq appears at C507 Change the stubby antenna or antenna bushing Tx RF freq appears at antenna pad Setup HHP mode with Joyphone Mode Offline d Band Select Mode ...

Page 41: ...to RF switch START Rx RF signal appears at C117 Change the RFL6000 U110 Change the Rx LDO U405 No Change the VCO U140 Change the PLL LDO U402 Rx LO signal appears at C455 Change the RFR6000 U155 Change the Rx LDO U405 Change the PLL LDO U402 Change the Main Board No Change the RF SAW Filter F112 Yes Yes No No Change the Duplexer DP101 Rx RF signal appears at C513 Rx RF signal appears at C121 Chang...

Page 42: ...to RF switch START Rx RF signal appears at C115 Change the RFL6000 U110 Change the Rx LDO U405 No Change the VCO U140 Change the PLL LDO U402 Rx LO signal appears at C455 Change the RFR6000 U155 Change the Rx LDO U405 Change the PLL LDO U402 Change the Main Board No Change the RF SAW Filter F111 Yes Yes No No Change the Duplexer DP100 Rx RF signal appears at C514 Rx RF signal appears at C119 Chang...

Page 43: ...spect to human exposure to RF energy Over 120 scientists engineers and physicians from universities government health agencies and industry after reviewing the available boy of research developed this updated Standard In March 1993 the US Federal Communications Commission FCC proposed the adoption of this updated Standard The design of your phone complies with this updated Standard Of course if yo...

Page 44: ...c operating and entertainment system in motor vehicles Check with the manufacturer or its representative to determine if these systems are adequately shielded from external RF energy You should check with the manufacturer of any equipment that has been added to your vehicle Consult the manufacturer of any personal medical devices such as pacemakers hearing aids etc to determine if they are adequat...

Page 45: ...el or chemical transfer or storage facilities areas where the air contains chemical or particles such as grain dust or metal powders and any other area where you would normally be advised to turn off your vehicle engine Do not transport or store flammable gas liquid or explosives in the compartment of your vehicle which contains your phone or accessories Vehicles using liquefied petroleum gas such...

Page 46: ...tation Access Channel Slot The assigned time interval for an access probe An Access Channel slot consists of an integer number of frames The transmission of an access probe is performed within the boundaries of an Access Channel slot Access Probe One Access Channel transmission consisting of a preamble and a message The transmission is an integer number of frames in length and transmits one Access...

Page 47: ...with bit errors frame category 9 See also Good Frames Base Station A station in the Domestic Public Cellular Radio Telecommunications Service other than a mobile station used for communicating with mobile stations Depending upon the context the term base station may refer to a cell a sector within a cell an MSC or other part of the cellular system See also MSC Base Station Authentication Response ...

Page 48: ...hannels Convolution Code A type of error correcting code A code symbol can be considered as the convolution of the input data sequence with the impulse response of a generator function CRC See Cyclic Redundancy Code Cyclic Redundancy Code CRC A class of linear error detecting codes which generate parity check bits by finding the remainder of a polynomial division Data Burst Randomizer The function...

Page 49: ...ty in the received bandwidth Io Effective Radiated Power ERP The transmitted power multiplied by the antenna gain referenced to a half wave dipole Electronic Serial Number ESN A 32 bit number assigned by the mobile station manufacturer uniquely identifying the mobile station equipment Encoder Tail Bits A fixed sequence of bits added to the end of a block of data to reset the convolutional encoder ...

Page 50: ...el frames from System Time in integer multiples of 1 25 ms The maximum frame offset is 18 75 ms Frame Quality Indicator The CRC check applied to 9600 bps and 4800 bps Traffic Channel frames Global Positioning System GPS A US government satellite system that provides location and time Information to users See Navstar GPS Space segment Navigation User interfaces ICD GPS 200 for Specifications Half F...

Page 51: ...mbling on the Forward CDMA Channel and spreading on the Reverse CDMA Channel The long code uniquely identifies a mobile station on both the Reverse Traffic Channel and the Forward Traffic Channel The long code provides limited privacy The long code also separates multiple Access Channels on the same CDMA channel See also Public Long Code and Private Long Code Long Code Mask A 42 bit binary number ...

Page 52: ...racteristics such as slotted operation and transmission power Mobile Station Identification Number MIN The 34 bit number that is a digital representation of the 10 digit directory telephone number assigned to a mobile station Mobile Station Originated Call A call originating from a mobile station Mobile Station Terminated Call A call received by a mobile station not to be confused with a disconnec...

Page 53: ...rs stored in the mobile station Numeric Information Numeric information consists of parameters that appear as numeric fields in message exchanged by the base station and the mobile station and information used to describe the operation of the mobile station OLC See Overload Class CDMA or Overload Control analog Optional Field A field defined within a message structure that is optionally to the mes...

Page 54: ... Pilot Channel An unmodulated direct sequence spread spectrum signal transmitted continuously by each CDMA base station The Pilot Channel allows a mobile station to acquire the timing of the Forward CDMA Channel provides a phase reference for coherent demodulation and provides a means for signal strength comparisons between base station for determining when to handoff Pilot PN Sequence A pair of m...

Page 55: ...The process by which a mobile station identifies its location and parameters to a base station Registration Zone A collection of one or more base stations treated as a unit when determining whether a mobile station should perform zone based registration Release A process that the mobile station and base station use to inform each other of call disconnect The set of all allowable pilot offsets as d...

Page 56: ... SMS Text Delivery Digital Paging i e Call Back Number CBN and Voice Mail Notification VMN SID See System Identification Signaling Tone A 10kHz tone transmitted by a mobile station on an analog voice channel to 1 confirm orders 2 signal flash requests and 3 signal release requests Signal Traffic Control message that are carried between the mobile station and base station on the Traffic Channel See...

Page 57: ...nnel 32 in the Forward CDMA Channel which transports the synchronization message to the mobile station Sync Channel Superframe An 80ms interval consisting of three Sync Channel frames each 26 666 ms in length System A system is a cellular telephone service that covers a geographic area such as a city Metropolitan region country or group of countries See also Network System Time The time reference ...

Page 58: ...he time reference by nearly all commonly available time and frequency distribution systems i e WWW WWVH LORAN C Transit Omega and GPS UTC Universal Temps Coordine See Universal Coordinated Time Voice Channel See Analog Voice Channel Voice Mobile Attenuation Code VMAC A 3 bit field in the Extended Address Word commanding the initial mobile power level when assigning a mobile station to an analog vo...

Page 59: ...iagram 2 Block Circuit Diagram 3 Part List 4 Component Layout 5 Accessories Desktop Charger AC Adapter Battery Travel Charger Hands Free Car Kit Portable Cigarrette Lighter Charger Data Cable Kit Headset USB Cable Kit Holster LG Electronics Inc 59 ...

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