LG CX9100 Service Manual

Features of CX9100

1. Wave Type

CELLULAR : G7W

●

PCS: G7W

●

2. Frequency Scope Transmit Frequency (MHz) Receive Frequency (MHz)

CELLULAR PCS CELLULAR PCS GPS

824.04 ~ 848.97 1850~1909.95 869.04~893.97 1930~1989.95 1575.42

3. Rated Output Power : CELLULAR = 0.26W

PCS = 0.24W

4. Output Conversion Method : This is possible by correcting the key board channel.

5. Voltage and Current Value of Termination Part Amplifier (Catalogue included)

PowerCurrentVoltagePart NameMODE

6. Functions of Major Semi-Conductors

Terminal operation control and digital signal processing MSM6550A

Memory MCP

(HYC0SGH0MF3P)

7. Frequency Stability

CELLULAR : ±0.5PPM

●

● PCS : ±0.1PPM

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Flash Memory (1Gbit) + SDRAM (512Mbit)

Storing of terminal operation program Converts Rx RF signal to baseband signalRFR6500 Converts baseband signal to Tx RF signalRFT6150

0.26W500mA4.2VAWT6321RCELLULAR

0.24W500mA4.2VAWT6321RPCS

FunctionClassification

CX9100

CDMA Mobile Subscriber Unit CX9100

SERVICE MANUAL

DUAL BAND CDMA

[PCS/Cellular/GPS]

CDMA MOBILE PHONE

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Table of Contents

General Introduction……………………………………………………………….……………...3

CHAPTER 1. System Introduction……………..………………………………………...4

1. CDMA Abstract…….……………………………………………………………….….…….…..4

2. Features and Advantages of CDMA Mobile Phone………….........................................5

3. Structure and Functions of Dual-band CDMA Mobile Phone……………….……….….8

4. Specification……………………………………………………………………………………..9

5. Installation………………………………………………………………………………………14

CHPATER 2. NAM Input Method………………………………………..……………….16

1. NAM Program Method and Telephone Number Inputting Method……………………16

CHAPTER 3. Circuit Description………………………………..……………………….26

1. RF Transmit/Receive Part……………………………………………………………….……26

2. Digital/Voice Processing Part……………………………………………………………….32

CHAPTER 4. Trouble Shooting………………………………………...………………...36

1. RX Part Trouble Shooting………………………………………………………..................36

1.1 DCN RX………………………………………………………………………………………36

1.2 PCS RX……………………………………………………………………………….………48

2. TX Part Trouble Shooting…………………………………………………………….………60

2.1 DCN TX…………………………………………………………………………….…………60

2.2 PCS TX…………………………………………………………………………….…………74

3. Logic Part Trouble Shooting………………………………………………………….……..88

3.1 Power………………………………………………………………………………………...88

3.2 LCD…………………………………………………………………………………….……..92

3.3 Camera……………………………………………………………………………….………94

3.4 Audio………………………………………………………………………………….……...98

3.5 Backlight…………………………………………………………………………………...110

3.6 Vibrator……………………………………………………………………………………..114

4. Bluetooth Part Trouble Shooting………………………………………………………….116

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CHAPTER 5. Safety………………………………………..………………………..………118

CHAPTER 6. Glossary……………………………………….………………………….…121

APPENDIX………………………………………………………………………………...……133

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General Introduction

The VX9100 phone has been designed to operate on the latest digital mobile communication technology, Code Division Multiple Access (CDMA). This CDMA digital technology has greatly enhanced voice clarity and can provide a variety of advanced features. Currently, CDMA mobile communication technology has been commercially used in Cellular and Personal Communication Service (PCS). The difference between them is the operating frequency spectrum. Cellular uses 800MHz and PCS uses 1.9GHz. The VX9100 support GPS Mode, we usually call it tri-band phone. Also, VX9100 works on Advanced Mobile Phone Service (S-GPS). We call it dualmode phone. If one of the Cellular, PCS base stations is located nearby, Call fail rate of triple-mode phone is less than dual-mode phone or single-mode phone.

The CDMA technology adopts DSSS (Direct Sequence Spread Spectrum). This feature of DSSS enables the phone to keep communication from being crossed and to use one frequency channel by multiple users in the same specific area, resulting that it increases the capacity 1 0 times more co mpar ed with that in the analog mode 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 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.

CDMA Standard Designator Description

Basic air interface

Network

Service

1x EV-DO related

interface

TIA/EIA-95A

TSB-74

ANSI J-STD-008

TIA/EIA-IS2000

TIA/EIA/IS-634 TIA/EIA/IS-651

TIA/EIA/IS-41-C

TIA/EIA/IS-124

TIA/EIA/IS-96-B

TIA/EIA/IS-637 TIA/EIA/IS-657

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IS-801

TIA/EIA/IS-707-A

TIA/EIA/IS-856 TIA/EIA/IS-878 TIA/EIA/IS-866 TIA/EIA/IS-890

CDMA Dual-Mode Air Interface

14.4kbps radio link protocol and inter-band operation IS-95 adapted for PCS frequency band CDMA20 1xRTT Air Interface

MAS-BS PCSC-RS Intersystem operations Non-signaling data comm.

Speech CODEC Short Message Service Packet Data Position Determination Service (gpsOne) High Speed Packet Data

CDMA2000 High Rate Packet Data Air Interface 1x EV-DO Inter-Operability Specification for HRPD

s Network Interface

Acces Recommended Minimum Performance Standards for High Rate Packet Data Access Terminal Test Application Specification (TAS) for High Rate Packet Data Air Interface

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Chapter1. System Introduction

1. CDMA Abstract

The CDMA mobile communication system has a channel hand-off function that is used for collecting the information on the locations and movements of mobile telephones from the cell site by auto matically controlling several cell site through the setup of data transmission routes, and then enabling one switching system to carry out the automatic remote adjustment. This is to maintain continuously the call state through the automatic location co nfirmation and automatic radio channel conversion when the busy subscriber moves from the service area of one cell site to that of another by using automatic location confirmation and automatic radio channel conversion functions. The call state can be maintained continuously by the information exchange between switching systems when the busy subscriber moves from one Cellular system area to the other Cellular system area.

In the Cellular system, the cell site is a small-sized low output type and utilizes a frequency allocation system that considers mutual interference, in an effort to enable the re-use of corresponding frequency from a cell site separated more than a certain distance.

Unlike the time division multiple access (TDMA) or frequency division multiple access (FDMA) used in the band limited environment, the Code Division Multiple Access (CDMA) system which is one of digital Cellular systems is a multi-access technology under the interference limited 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 two persons desire to talk with each other at the same time, whereas FDMA can be used to enable one person to talk in soprano, whereas the other in bass (one of the two talkers can carry out synchronization for hearing in case there is a bandpass filter function in the area of the hearer). Another available method is to make two persons to sing in different languages at the same time, space, and frequency when wishing to let the audience hear the singing without being confused. This is the characteristic of CDMA.

On the other hand, when employing the CDMA technology, each signal has a different pseudo-random binary sequence used to spread the spectrum of carrier. A great number of CDMA signals share the same frequency spectrum. In the perspective of frequency area or time area, several CDMA signals are overlapped. Among these types of signals, only desired signal energy is selected and received through the use of pre-determined binary sequence; desired signals can be separated, and then received with the correlator used for recovering the spectrum into its original state. At this time, the spectrums of other signals that have different codes are not recovered into its original state, and appears as the self-interference of the system.

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2. Features and Advantages of CDMA Mobile Phone

2.1 Various Types of Diversities

When employing the narrow band modulation (30kHz band) that is the same as the analog FM modulation system used in the existing Cellular system, the multi-paths of radio waves create a serious fading. However, in the CDMA broadband modulation (1.25MHz band), three types of diversities (time, frequency, and space) are used to reduce serious fading problems generated from radio channels in order to obtain high-quality calls. Time diversity can be obtained through the use of code interleaving and error correction code whereas frequency diversity can be obtained by spreading signal energy to wider frequency band. The fading related to normal frequency can affect the normal 200~300KHz among signal bands and accordingly, serious effect can be avoided. Moreover, space diversity (also called path diversity) can be realized with the following three types of methods. First, it can be obtained by the duplication of cell site receive antenna. Second, it can be obtained through the use of multi-signal processing device that receives a transmit signal having each different transmission delay time and then, combines them. Third, it can be obtained through the multiple cell site connection (Soft Handoff) that connects the mobile station with more than two cell sites at the same time.

2.2 Power Control

The CDMA system utilizes the forward (from a base station to mobile stations) and backward (from the mobile station to the base station) power control in order to increase the call processing capacity and obtain high-quality 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 con trol on all the mobile stations, the syste m capacity can be maximized.If th e 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 the CDMA system, forward power control, backward open loop power control, and closed loop power control methods are used. The forward power control is carried out in the cell site to reduce the transmit power on mobile stations less affected by the multi-path fading and shadow phenomenon and the interference of other cell sites when the mobile station is not engaged in the call or is relatively nearer to the corresponding cell site. This is also used to provide additional power to mobile stations having high call error rates, located in bad reception areas or far away from the cell site. The backward open loop power control is carried out in a corresponding mobile station; the mobile station measures power received from the cell site and then, reversely increases/decreases transmit power in order to compensate channel changes caused by the forward link path loss and terrain characteristics in relation to the mobile station in the cell site. By doing so, all the mobile transmit signals received by the base station have same strength.

Moreover, the backward closed loop power control used by the mobile station is performed to control power using

the commands issued out by the cell site. The cell site receives the signal of each corresponding mobile station and compares this with the pre-set threshold value and then, issues out power increase/decrease commands to the corresponding mobile station every 1.25msec (800 times per second). By doing so, the gain tolerance and the different radio propagation loss on the forward/backward link are complemented.

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2.3 Voice Encoder and Variable Data Speed

The bi-directional voice service having variable data speed provides voice communication which employs voice

encoder algorithm having power variable data rate between the base station and the mobile station. On the other hand, the transmit voice encoder performs voice sampling and then, creates encoded voice packets to be sent out to the receive voice encoder, whereas the receive voice encoder demodulates the received voice packets into voice samples.

One of the two voice encoders described in the above is selected for use depending on inputted automatic conditions

and message/data; both of them utilize four-stage frames of 9600, 4800, 2400 , and 1200 bits per second for Cellular and 14400,7200,3600,1800 bits per second for PCS, so PCS provide relatively better voice quality (almost twice better than the existing cellular system). In addition, this type of variable voice encoder u tilizes adaptive threshold values on selecting required data rate. It is adjusted in accordance with the size of background noise and the data rate is increased to high rate only when the voice of caller is inputted.

Therefore, background noise is suppressed and h igh-qu ality voice 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

Voice privacy is provided in the CDMA system by means of the private long code mask used for PN spreading. Voice privacy can applied on the traffic channels only. All calls are initiated using the public long code mask for PN spreading. The mobile station user may request voice privacy during call setup using the origination message or page response message, and during traffic channel operation using the long code transition request order. The Transition to private long code mask will not be performed if authentication is not performed. To initiate a transition to the private or public long code mask, either the base station or the mobile station send s a long code transition request order on the traffic channel.

2.5 Soft Handoff

A handoff in which the mobile station commences communications with a new base station without interrupting communications with the old base station. Soft handoff can only be used between CDMA channels having identical frequency assignments.

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2.6 Frequency Re-Use and Sector Segmentation

Unlike the existing analog Cellular system, the CDMA system can reuse the same frequency at the adjacent cell.

there is no need to prepare a separate frequency plan. Total interference generated on mobile station signals received from the cell site is the sum of interference generated from other mobile stations in the same cell site and interference generated from the mobile station of adjacent cell site. That is, ea ch mobile station signal generates interference in relation to the signals of all the other mobile stations.

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Total interference from all the adjacen t cell sites is the ratio of interference from all the cell sites versus total interference from other mobile stations in the same cell site (about 65%). In the case of directional cell site, one cell normally uses a 120°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 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 despite the drop in call quality. This type of function requires 40% o f normal call channels in the standby mode during the handoff, in an effort to avoid call disconnection resulting from the lack of channels. 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.

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3. Structure and Functions of tri-band CDMA Mobile Phone

The hardware structure of CDMA mobile phone is made up of radio frequency (RF) part and logic part. The RF part is composed of Receiver part (Rx), Transmitter part (Tx) and Local part (LO). For the purpose of operating on triband, It is necessary dual Tx path, tri Rx path, dual PLL and switching system for band selection. The mobile phone antenna is connected with the frequency separator which divide antenna input/output signals between Cellular frequency band (824~894 MHz) and PCS frequency band (1850~1990MHz). Each separated path is linked with the Cellular duplexer and PCS duplexer. Duplexer carries out separating Rx band and Tx band. The Rx signals from the antenna are converted into intermediate frequency(IF) band by the frequency synthesizer and frequency down converter. And then, pass SAW filter which is a band pass filter for removing out image frequency. The IF output signals that have been filtered is converted into digital signals via Analog-to-Digital Converter (ADC). In front of the ADC, switching system is required to choose which band path should be open. The digital signals send to 5 correlators in each CDMA de-modulator. Of these, one is called a searcher whereas the remaining 4 are called data receivers (fingers). Digitalized IF signals include a great number of call signals that have been sent out by the adjacent cells. These signals are detected with pseudo-noise sequence (PN Sequence). Signal to interference ratio (C/I) on signals that match the desired PN sequence are increased through this type of correlation detection process, but other signals obtain processing gain by not increasing the ratio. The carrier wave of pilot 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 ou t multi-paths in ac cordance 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 deal by obtaining the diversity combined output for de-modulation. Moreover, the searcher can be used to determine the most powerful path from the cell sites even during the soft handoff between the two cell sites. Moreover, 3 data receivers are alloc ated in order to carry out the de-modulation of these paths. Output data that has been demodulated changes the data string in the combined data row as in the case of original signals(deinterleaving), and then, are demodulated by the forward error correction decoder which uses the Viterbi algorithm.

Mobile station user information send out from the mobile station to the cell site pass through the digital voice encoder via a mike. Then, they are encoded and forward errors are corrected through the use of convolution encoder. Then, the order of code rows is changed in accordance with a certain regulation in order to remove any errors in the interleaver. Symbols made through the above process are spread after being loaded onto PN carrier waves. At this time, PN sequence is selected by each address designated in each call. Signals that have been code spread as above are digital modulated (QPSK) and then, power controlled at the automatic gain control amplifier (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.

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4. Specification

4.1 General Specification

4.1.1 Transmit/Receive Frequency Interval :

1)CELLULAR : 45 MHz

2)PCS : 80 MHz

4.1.2 Number of Channels (Channel Bandwidth)

1)CELLULAR : 20 Channels

2) PCS : 48 Channels

4.1.3 Operating Voltage : DC 3.3~4.2V

4.1.4 Battery Power Consumption : DC 3.7V

SLEEP IDLE MAX POWER

CELLULAR 1 mA 110~180mA 700 mA (24.5 dBm) PCS 1 mA 120~180 mA 700 mA (24.5 dBm)

4.1.5 Operating Temperature : -0°C ~ +60°C

4.1.6 Frequency Stability

1)CDMA : ±0.5PPM

2)PCS : ±0.1PPM

4.1.7 Antenna : FIXED Type (PIFA), 50 Ohm

4.1.8 Size and Weight

1)Size : 101.6(H) * 54.0(W) * 16.5(D) mm

2)Weight : 125g (Approximately with st andard bat t ery)

4.1.9 Channel Spacing

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1)CELLULAR : 1.25MHz

2)PCS: 1.25 MHz

4.1.10 Battery Type, Capacity and Operating Time.

Unit = Hours : Minutes

Standby Time

CELLULAR About 480 Hours (SCI=2) PCS About 480 Hours (SCI=2) CELLULAR 150 Minutes (-92dBm input)

Talk time

PCS 150 Minutes (-92dBm input)

Standard (800mAh)

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4.2 Receive Specification

4.2.1 Frequency Range

CELLULAR : 869.820 MHz ~ 893.190 MHz PCS : 1930 MHz ~ 1990 MHz GPS : 1575.42 MHz

4.2.2 Local Oscillating Frequency Range :

CELLULAR : 1738.08MHz ~ 1787.94MHz PCS : 1715.56MHz ∼ 1768.89MHz GPS : 3150.84MHz

4.2.3 Sensitivity

CELLULAR : -104dBm (C/N 12dB or more) PCS : -104dBm (C/N 12dB or more) GPS : -148.5dBm (without SA mode)

4.2.4 Selectivity

CELLULAR : 3dB C/N Degration (With Fch±1.25 kHz : -30dBm) PCS : 3dB C/N Degration (With Fch±1.25 kHz : -30dBm)

4.2.5 Spurious Wave Suppression : Maximum of -80dB

4.2.6 CDMA Input Signal Range

Dynamic area of more than -104~ -25 dB: 79dB at the 1.23MHz band.

4.3 Transmit Specification

4.3.1 Frequency Range

CELLULAR : 824.820MHz ~ 848.190MHz PCS : 1850 MHz ~ 1910 MHz

4.3.2 Output Power

CELLULAR : 0.26W PCS: 0.24W

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4.3.3 Interference Rejection

Single Tone : -30dBm at 900 kHz (CELLULAR), -30dBm at 1.25MHz(PCS) Two Tone : -43dBm at 900 kHz & 1700kHz(CELLULAR), -43dBm at 1.25 MHz & 2.05 MHz (PCS)

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4.3.11 CDMA TX Frequency Deviation :

1) CELLULAR: +300Hz or less

2) PCS: ± 150Hz

4.3.12 CDMA TX Conducted Spurious Emissions

1) CELLULAR: 900kHz : - 42 dBc/30kHz below

1.98MHz : - 54 dBc/30kHz below

2) PCS: 1.25MHz: - 42 dBc/30kHz below

1.98MHz : - 50 dBc/30kHz below

4.3.13 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

4.4.2 PCS mode

Ch #

25 1851.25 425 1871.25 825 1891.25 50 1852.50 450 1872.50 850 1892.50 75 1853.75 475 1873.75 875 1893.75

Center Freq

824.640

825.870 0

827.10

30

828.3

829.560

830.790

832.020

833.250

834.480

835.890

(MHz)

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Ch #

404 445 486 527 568 609 650 697 738 779

Center Freq

(MHz)

Ch #

837.120

838.350

839.580

840.810

842.040

843.270 0

844.50

845.910

847.140

848.370

Center Freq

(MHz)

100 1855.00 500 1875.00 900 1895.00 125 1856.25 525 1876.25 925 1896.25 150 1857.50 550 1877.50 950 1897.50 175 1858.75 575 1878.75 975 1898.75

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200 1860.00 600 1880.00 1000 1900.00 225 1861.25 625 1881.25 1025 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

4.5.2 PCS mode

Ch #

25 1931.25 425 1951.25 825 1971.25 50 1932.50 450 1952.50 850 1972.50

75 1933.75 475 1953.75 875 1973.75 100 1935.00 500 1955.00 900 1975.00 125 1936.25 525 1956.25 925 1976.25

Center Freq

(MHz)

869.640

870.870

872.100

873.330

874.560

875.790

877.020

878.250

879.480

880.890

Ch #

404 445 486 527 568 609 650 697 738 779

Center Freq

(MHz)

Ch #

882.120

883.350

884.580

885.810

887.040

888.270

889.500

890.910

892.140

893.370

Center Freq

(MHz)

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150 1937.50 550 1957.50 950 1977.50 175 1938.75 575 1958.75 975 1978.75 200 1940.00 600 1960.00 1000 1980.00 225 1941.25 625 1961.25 1025 1981.25

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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 : 1575.42 MHz

4.5.4 Bluetooth mode : 2400 MHz ~ 2483.5 MHz

4.6 AC Adaptor : See Appendix

4.7 Cigar Lighter Charger : See Appendix

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5. Installation

5.1 Installing a Battery Pack

1) The Battery pack is keyed so it can only fit one way. Align the groove in the battery pa ck 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.

5.2 For Adapter Use

1) Plug the adapter into a wall outlet. The adapter can be operated from a 110V source. When AC power is connected to the adapter.

2) Insert the adapter IO plug into the phone with the installed battery pack. Red light indicates battery is being charged.. Green light indicates battery is fully charged.

5.3 For Mobile Mount

5.3.1 Installation Position

In order to reduce echo sound when using the Hands-Free Kit, make sure 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 bracket on the selected area. Then with the four machine screws provided, mount the counterpart on the reverse side of the reverse side of the cradle. Secure the two brackets firmly together by using the two bracket joint screws provide. The distance between the cradle and the interface box must not exceed the length of the main cable.

5.3.3 Interface Box

Choose an appropriate flat surface ( somewhere under the dash on the passenger side is preferred ) and mount the 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 clipping I onto the sunvisor (driver’s side) or by attaching it to door post (driver’s side), using a velcro adhesive tape (not included).

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5.3.5 Cable Connections

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5.3.5.1 Power and Ignition Cables

Connect the red wire to the car battery positive terminal and the black wire to 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.)

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CHAPTER 2. NAM Input Method

(Inputting of telephone numbers included)

1. NAM Programming Method

1) Press “##77647269100” + “SEND” and th en, press “000000”

2) Press “1” key for entering “Service Prg.”.

● Usually pressing soft key will sav e the change.

● To exit service program, press “END” key.

3) MEID/ESN

You can see the MEID/ESN number.

Press softkey “OK” to edit more NAM1 items. Press softkey “Exit” to exit Service Programming.

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4) NAM1 Phone Number (MDN)

You can edit the NAM1 Phone Number (MDN).

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

5) NAM1 Phone Number (MIN)

You can edit the NAM1 Phone Number (MIN).

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

6) NAM1 Home SID

You can edit the NAM1 Home SID.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

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7) NAM1 Name

You can edit the NAM1 Name.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

8) More NAM1 Programming

You can decide to edit more NAM1 Name.

Press softkey “OK” to exit Service Programming. Press softkey “More” to edit more advanced NAM1 items.

9) Service Code

You can edit Service Code.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

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10) NAM1 MCC

You can edit NAM1 Mobile Country Code.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

11) NAM1 NMSID

You can edit NAM1 NMSID.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

12) NAM1 True IMSI MCC

You can edit NAM1 True IMSI MC

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

C.

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CX9100

13) NAM1 True IMSI NMSID

You can edit NAM1 True IMSI NMSID.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

14) NAM1 PRL Enabled

You can see NAM1 PRL Enabled.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

15) CDMA Home SID/NID

You can edit NAM1 Home SID/NID pair.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

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16) NAM1 CDMA Pri. CH A

You can edit NAM1 CDMA Pri. Channel A.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

17) NAM1 CDMA Sec. CH A

You can edit NAM1 CDMA Secondary Channel A.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

18) NAM1 CDMA Pri. CH B

You can edit NAM1 CDMA Primary Channel B.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

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19) NAM1 CDMA Sec. CH B

You can edit NAM1 CDMA Secondary Channel B.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

20) Lockout SID/NID

You can edit Lockout SID/NID pair.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

21) NAM1 Home Sys. Reg.

You can edit NAM1 Home System Registration.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

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CX9100

22) NAM1 Forn SID Reg

You can edit NAM1 Foreign SID Registration.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

23) NAM1 Forn NID Reg

You can edit NAM1 Foreign NID Registration.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

24) NAM1 ACC Ovld Class

You can view the NAM1 Access Overload Class.

Press softkey “OK” to edit more NAM1 items. Press softkey “Back” to edit previous NAM1 items.

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25) NAM2 Setting

You can decide to edit NAM2 items.

Press softkey “OK” to skip NAM2 items setting. Press softkey “Edit” to edit NAM2 related items. You can edit NAM2 items such as NAM1 items

26) Phone Model

You can see the Phone Model Number.

Press softkey “OK” to edit more items. Press softkey “Back” to edit previous items.

27) Slot Cycle Index

You can edit Slot Cycle Index.

Press softkey “OK” to save Slot Cycle Index. Press softkey “Back” to edit previous items.

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28) Powering Down

Restart.

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CX9100

CHAPTER 3. Circuit Description

1. RF Transmit/Receive Part

1.1 Overview

The TX and RX part employs the Direct-Conversion system. The TX and RX frequencies are respectively

824.04~848.97 and 869.04~893.97 for cellular and 1850~1910 and 1930~1990 for PCS. The block diagram is shown in [Figure 1-1]. CDMA RF signals received through the antenna are separated by the Diplexer. RF Signal fed into the low noise amplifier in RFR6500(LNA) through the duplexer. Then, they are fed into Mixer in RFR6500. In RFR6500, the RF signal is changed into baseband signal directly. Then, this signal is changed into digital signal by the analog to digital converter (ADC, A/D Converter), and the digital circuit part of the MSM(Mobile Station Modem) 6550 processes the data from ADC. The digital processing part is a demodulator. In the case of transmission, RFT6150 receives OQPSK-modulated analog signal from the MSM6550A. The RFT6150 connects directly with MSM6550A using an analog baseband interface. In RFT6150, the baseband quadrature signals are upconverted to the Cellular or PCS frequency bands and amplified to provide signal drive capability to the power amp. After that, the RF signal is amplified by the Power Amp in order to have enough power for radiation. Finally, the RF signal is sent out to the cell site via the antenna after going through the duplexer.

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[Figure 1-1] RF Block Diagram of VX9100

Antenna

CDMA

DCN-Rx

DCN-Tx

PCS-Rx

PCS-Tx

GPS

HDET

RFR6500

F

ref

Loop Filter

for GPS

Processing

&Dist

PLL1

Camera

LO Gen

GPS VCO

3D, 2D

NC

Diversity Rx

VCO

OpenGL® ES

Graphics

Dual PAM

NC

H.263, H.264

MPEG-4

NC

Dual SAW

Rx RF

RFT6150

CDMA VCOs

Secondary Path

Rx1_Q

EVRC, QCELP

AMR, CMX,

Video

MP3, AAC,

MIDI

Rx1_I

Audio

Primary Path

Rx0_Q

UART2/RUIM1

UART3/RUIM2

&Dist

Gen

Rx0_I

USB On The

Keypad I/F

SD/SDIO

UART1

Go

PLL0

Diversity

Rx VCO

LO

SBI Control

MSM6500

Connectivity

EBI2

for CDMA Tx

F

ref

F

ref

Dual Memory

Rx ADC

Buses

EBI1

Loop Filter

VCTCXO

Buffer

Ref.

Bluetooth 1.1

Processor

Tx DAC

SBI

gpsOne

TX PLL

Processor

Circuits

Control

Tx VCO

Processor 1X,

GSM/GPRS

1X EV-DO

CDMA

Gain

Processors

PCS

DCN

Dual SAW

Tx RF

LO Gen &Dist

SBI Control

Tx_Q

QDSP4000

Modem

PLL

Tx_I

ARM926EJS

with Jazelle

MSM

JTAG I/F

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Logic

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1.2 Description of RX Part Circuit

1.2.1 Quintplexer (DP100)

The Quintplexer consists of the Rx bandpass filter (BPF), the Tx BPF and the GPS filter (BPF) which has the function of separating Tx, Rx and GPS signals in the full Triplex 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 LNA and mixer, attenuate receiver spurious response and suppress local oscillator energy. As a result frequency sensitivity and selectivity of mobile phone increas e. The specification of VX9100 Quintplexer described below;

z PCS band

Tx Rx Tx to Rx (min) Pass Band 1850.5~1909.5 MHz 1930.5~1989.5 MHz Insertion Loss 3.9 dB max 4.2 dB max Return Loss 9.5 dB min 9.0dB min

Attenuation

z Cellular band

Pass Band 824~849 MHz 869~894 MHz Insertion Loss 2.6 dB max 3.4 dB max Return Loss 9.0 dB min 9.0dB min

Attenuation

z GPS band

Pass Band 1574.42~1576.42MHz Insertion Loss 1.9 dB m a x

40 dB min

(1930.5~1989.5MHz)

Tx Rx Tx to Rx (min)

40 dB min

(869~894MHz)

(1850.5~1909.5MHz)

(824~849MHz)

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50dB min

55dB min

53 dB (1850.5~1909.5MHz)

40 dB (1930.5~1909.5MHz)

5

5 dB (824~894MHz)

40 dB (869~894MHz)

Return Loss 9 min Isolation1 50 dB min(Cel Isolation2 45 dB min(PCS Tx à GPS)

l Tx à GPS)

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1.2.2 RFR6500 – LNA part (U108)

The RFR6500 has cellular, and PCS LNA, respectively. The characteristics of Low Noise Amplifier (LNA) are low noise figure, high gain, high intercept point and high reverse isolation. The frequency selectivity characteristic of mobile phone is mostly determined by LNA. The specification of VX9100 LNA is described below:

Parameter

Gain -19 -20 3 -3 14 15 dB

Noise Figure 20 20 4.5 6 1.3 1.1 dB

Input IP3 10 10 5 10 7 3 dBm

1.2.3 GPS LNA(U101)

The characteristics of Low Noise Amplifier (LNA) are low noise figure, high gain, high intercept point and high reverse isolation. The frequency selectivity ch aracteristic of mobile phone is mostly determined by LNA. The specification of VX9100 GPS LNA is described below

Low gain Middle gain High gain Units

Cellular PCS Cellular PCS Cellular PCS

UnitsGPS BandParameter

dB13.1Gain

dB0.77Noise Figure dBm3.41dB compression point dBm+7IIP3

1.2.4 RX RF Dual SAW Filter(F100)

The main function of RX RF SAW filter is to attenuate mobile phone spurious frequency, attenuate noise amplified by the LNA and suppress second harmonic originating in the LNA.

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1.2.5 RFR6500 - Down-converter Mixers part (U108)

The RFR6500 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 down-converting Mixers (Cellular, PCS and GPS), and a programmable PLL for generating RX LO frequency and an RX LO Buffer Amplifier and RX Voltage Controlled Oscillator. The GPS LNA & mixers offer the most advanced and integrated CDMA RX solution designed to meet cascaded Noise Figure (NF) and Thirdorder Intercept Point (IIP3) requirements of IS-98D and J-STD-018 specifications for Sensitivity, Two-Tone Intermodulation, and Single-tone Desensitization. Operation modes and band selection are specially controlled from the Mobile Station Modem MSM6550A. The specification of VX9100 Mixers is described below:

Parameter

Noise Figure 25 27 7.9 12 dB

Input IP3 -5 -11 4 4 dBm

Input IP2 30 30 56 56 dBm

Low gain High gain Units

Cellular PCS Cellular PCS

1.3 Description of Transmit Part Circuit

1.3.1 RFT6150 (U109)

The RFT6150 Base-band to RF Transmit Processor performs all TX signal-processing functions required between digital Base-band and the Power Amplifier Modulator (PAM). The Base-band quadrate signals are up-converted to the Cellular or PCS frequency bands and amplified to provide signal d rive capability to the PAM. The RFT6150 includes mixers for up-converting analog Base-band to RF, a programmable PLL for generating TX LO frequency a TX LO Buffer Amplifier and TX Voltage Controlled Oscillator, cellular and PCS driver amplifiers and TX power control through an 85 dB VGA. As added benefit, the single sideband up-conversion eliminates the need for a band pass filter normally required between the up-converter and driver amplifier.

I, I/, Q and Q/ signals proceed from the MSM6550A to RFT6150 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 RFT6150 converts baseband signals into RF signals. After passing through the upconverters, RF signal is inputted into the Power AMP.

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zRFT6150 Cellular and PCS CDMA R F Specifications

Parameter Condition Min. Type. Max. Units

Rated Output Power

Min Output Power

RX band noise power

ACPR

1.3.2 Dual Power Amplifier(U105)

The Dual power amplifier that can be used in the PCS and CDMA mode has linear amplification capability and 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 go ing through the AlGaAs/GaAs HBT (heterojunction bipolar transistor) process. The module of power amplifier is made up of an output end interface circuit including this MMIC. The maximum power that can be inputted through the input terminal is +10dBm and conversion gain is about 26.5dB. RF transmit signals that have been amplified through the power amplifier are sent to the duplexer. .

Average CDMA Cellular

Average CDMA PCS

Average CDMA Cellular

Average CDMA PCS

CDMA Cellular

CDMA PCS

Cellular: Fc±885kHz

PCS : Fc±1.25MHz

7 9

-75

-136

-133

-56

-57

dBm dBm

dBm/Hz

dBc/30kHz

1.4 Description of Frequency Synthesizer Circuit

1.4.1 Voltage Control Temperature Compensation Crystal Oscillator (VCTCXO, U107)

The temperature variation of mobile phone can be compensated by VCTCXO. The reference frequency of a mobile phone is 19.2 MHz. The receiver frequency tuning signals called TRK_LO_ADJ from MSM as 0.5 V~2.5 V 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.

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2. Digital/Voice Processing Part

2.1 Overview

The digital/voice processing part processes the user's commands and processes all the digital and voice signal processing in order to operate in the phone. The digital/voice processing part is made up of a main keypad/touch keypad/LCD, receptacle part, voice processing part, mobile station modem part, memory part, and power supply part.

2.2 Configuration

2.2.1 Keypad/LCD and Receptacle Part

This is used to transmit keypad signals to MSM6550A. It is made up of a keypad backlight part that illuminates the keypad, LCD part that displays the operation status onto the screen, and a receptacle that receives 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 part for amplifying the voice signals and sending them to the ear piece, amplifying part that amplifies ringer signals coming out from MSM6550A, and amplifying part that amplifies signals coming out from MIC and transferring them to the audio processor.

2.2.3 MSM (Mobile Station Modem) 6550A Part

MSM is the core elements of CDMA terminal and carries out the functions of CPU, encoder, interleaver, deinterleaver, Viterbi decoder, Mod/Demod, and vocoder.

2.2.4 Memory Part

The memory part is made up of a NAND Flash memory and a SDRAM for storing data.

2.2.5 Power Supply Part

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The power supply part is made up of circuits for generating various types of power, used for the digital/voice processing part.

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2.3 Circuit Description

2.3.1 Keypad/LCD and Receptacle Part

Once the keypad is pressed, the key signals are sent out to MSM6550A for processing. In addition, when the key is pressed, the keypad/LCD lights up through the use of 10 LEDs. The terminal status and operation are d isplayed on the screen for the user with the characters and icons on the LCD.

2.3.2 Audio Processing Part

MIC signals are amplified through OP AMP, inputted into the audio codec (included in MSM6550A) and converted into digital signals. Oppositely, digital audio signals are converted into analog signals after going through the audio codec. These signals are amplified at the audio amplifier and transmitted to the ear-piece. The signals from MSM6550A activate the ringer by using signals generated in the timer in MSM6550A.

2.3.3 MSM Part

MSM6550A is the core element of CDMA system terminal that includes ARM926EJ-S microprocessor core. It supports both CDMA and Digital FM, operating in both the cellular and PCS spectrums. The subsystems within the MSM6550A include a CDMA processor, a DFM processor, a multi-standard Vocoder, an integrated CODEC with earpiece and microphone amplifiers, general-purpose ADC for subsystem monitoring, an ARM926EJ-S microprocessor, and Universal Serial Bus (USB) supporting forward and reverse link data communications of 307.2 Kbps simultaneously. And it also contains complete digital modulation and demodulation systems for CDMA standards, as specified in IS-95-A/B/C. In MSM, coded symbols are interleaved in order to cope with multi-path fading. Each data channel is scrambled by the long code PN sequence of the user in order to ensure the confidentiality of calls. Moreover, binary quadrature codes are used based on Walsh functions in order to discern each channel. Data created thus are 4-phase modulated by one pair of Pilot PN code and they are used to create I and Q data. When 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.

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[Figure 2-2] Block Diagram of Digital/Voice Processing Part

Antenna

CDMA

DCN-Rx

DCN-Tx

PCS-Rx

PCS-Tx

GPS

HDET

for GPS

RFR6500

F

ref

Loop Filter

Processing

&Dist

PLL1

Camera

LO Gen

GPS VCO

VCO

OpenGL® ES

3D, 2D

NC

Diversity Rx

H.263, H.264

Graphics

MPEG-4

Dual PAM

NC

Dual SAW

Rx RF

RFT6150

CDMA VCOs

Secondary Path

Rx1_I

Rx1_Q

EVRC, QCELP

AMR, CMX,

Video

MP3, AAC,

MIDI

Primary Path

Rx0_Q

UART2/RUIM1

UART3/RUIM2

Audio

&Dist

Gen

Rx0_I

USB On The

Keypad I/F

SD/SDIO

UART1

Go

PLL0

Diversity

Rx VCO

LO

Digital I/Os & Controls

SBI Control

MSM6500

Connectivity

EBI2

F

ref

Buses

EBI1

F

ref

Dual Memory

for CDMA Tx

Loop Filter

VCTCXO

Buffer

Ref.

Bluetooth 1.1

Processor

Rx ADC

SBI

Processor

Tx DAC

Circuits

Control

Gain

Tx VCO

Digital I/Os

& Controls

TX PLL

Processors

Processor 1X,

GSM/GPRS

Processor

1X EV-DO

gpsOne

CDMA

PCS

DCN

Dual SAW

Tx RF

LO Gen &Dist

SBI Control

Tx_I

Tx_Q

ARM926EJS

QDSP4000

Modem

with Jazelle

PLL

JTAG I/F

MSM

QDSP4000

Z3X-BOX.COM

Qwerety Keypad

Qwerty Key

IC

A

Z

S

X

DF

CV

G

B

H

N

Q

W

ER

T

Y

Image Sensor

2.0M CMOS,

(MAX9775)

Stereo Headset

Sub-System

Audio

Receiver

MIC

Speaker

Stereo

Micro SD

Keypad

*

0#

456

123

789

-34-

16bit

EBI1

EBI2

USB 1.1 FS

Bluetooth v1.1

(LP3922)

PMIC

Main (240x320, 260K)

Sub (64x160, 260K)

LCD

Bluetooth v1.1

RF Module

Bluetooth

8bit

MCP

512MBit

SDRAM

NAND

1GBit

(CAM_DVDD/CA

M_AVDD/CAM_I

Sub PMIC

OVDD)

LGE Internal Use Only

CX9100

2.3.4 Memory Part

MCP contents 1024Mbits NAND FLASH memory and 512Mbits SD RAM. In the NAND Flash Memory part of MCP are programs used for terminal operation. The programs can be changed through downloading after the assembling of terminals. On the SDRAM data generated during the terminal operation are stored temporarily.

2.3.5 Power Supply Part

POWER ON mode will be activated by a POWER_ON_SW signal or the insertion of a charger input voltage (V_CHAR). During the Power On Sequence the output voltages MSMC(Buck1), MSMP1(Buck2), MSMP2(LOD1), MSMA(LDO4) and LCD(LDO2) will be activated in a sequence. Reset (RESIN\) will be released in order to power the host processor up properly. when MSMx[*] reaches 87% of its final value, a 60ms reset timer is started. Now the BB Processor is initialized and will assert PS_HOLD signal high within 60ms. PS_HOLD maintains the power on.

The two Buck converters / LDO1,2,4 in PMIC are generating the +1.275V_MSMC, +1.85V_MSMP1, +2.6V_MSMP2, +2.8V_LCD, and +2.6V_MSMA respectively.

The Rx part LDO3 in PMIC is operated by the control signal SLEEP/ from MSM6550A The Tx part LDO4 in PMIC is operated by the control signal IDLE/ from MSM6550A. The TCXO part LDO5 in PMIC is operated by the control signal TCXO_EN/ from MSM6550A.

2.3.6 Logic Part

The logic part consists of internal CPU of MSM, RAM, MCP. The MSM6550A receives TCXO (=19.2MHz) from the U1010 and controls the phone in CDMA modes. The major components are as follows:

CPU

The ARM926EJ-S microprocessor includes a 3 stage p ipelined RISC architecture, both 32-bit ARM and 16-bit THUMB instruction sets, a 32-bit address bus, and a 32-bit internal data bus. It has a high performance and low power consumption.

MCP

NAND Flash is used to store the terminal’s program. Using the down-loading program, the program can be changed even after the terminal is fully assembled.

SDRAM is used to store the internal flag information, call processing data, and timer data.

KEYPAD

For key recognition, key matrix is setup using key encoder IC . 5 LEDs and backlight circuitry are includ e d in the keypad for easy operation in the dark.

LCD MODULE

LCD module contains a controller which will display the information onto the LCD by 16-bit data from the MSM6550A. It is also supplied stable +2.8V_LCD by Out6 in U5002 for wide view angle and LCD reflects to

improve the display efficiency. 7 LEDs is used to display LCD backlight.

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CX9100

4.1 Rx Part Trouble

4.1.1 DCN Rx

CHAPTER 4. Trouble Shooting

Test Point

Mobile S/W

Quintplexer

Start

Rx TEST SETUP (Joyphone)

- Tes t C hann el: 3 8 4

- Test Band : US Cellular

- SID: 2004

- Sector Power: - 30 dB m Spec trum Analyzer Setting

Oscilloscope Setting

1. Check

DC Power Supply circuit

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RFR6500

VCTCXO

Check flow

3. Check

Control signal

4. Check

RF Signal path

2. Check VCTCXO

-36-C

NO

5. Check

Rx I/Q data

Redownload S /W , Cal

LGE Internal Use Only

CCX9100

4.1.1.1 Checking DC Power supply circuit (PMIC)

Test Point

R431

C432

Circuit Diagram

TP1

TP2

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LGE Internal Use Only

CX9100

Start

Checking Flow

Check C432(TP2)

+

2

85 V_ RX is OK?

.

YES

Check R431(TP1)

+2.6V_MSMP2 is OK?

YES

DC Po wer supply Circuit is OK. See next Page to check

VCTCXO circuit

NO

The Problem may be Logic part

Refer to Logic troubleshoot

The Problem may be Logic part

Refer to Logic troubleshoot

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CX9100

4.1.1.2 Checking VCTCXO circuit

R111

pin4

U107

pin3

Test Point

C181

TP2

Circuit Diagram

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TP1

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CX9100

Start

Checking Flow

Check U107 pin3(TP1) Is it 19.2MHz? (Refer to

figure 4.1.1 (a))

NO

Check U107 pin4(TP2)

Is it 2.85 V? (Refer to

figure 4.1.1 (b))

YES

Replace U107 and then check R111 , C181 .

Is it similar?

NO

Replace Main B /D

VCTCXO circuit is Ok . See next page

YES

NO

YES

to check control signal .

The Problem may be Logic part

Referto Logic troubleshoot

VCTCXO circuit is Ok . See next page

to check control signal .

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Figure 4.1.1 (a) Figure 4.1.1 (b)

Waveform

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CX9100

4.1.1.3 Checking Control signal

U108 pin49(SBST0)

pin50(SBDT0) pin51(SBCK0)

Test Point

Circuit Diagram

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LGE Internal Use Only

CX9100

Start

Checking Flow

Check if there is any major difference referring

Check pin49, 50, 51 at U108

To Figure 4.1.1 (c), (d)

NO

Redownload S/W

Check pin49, 50, 51 at U108

To Figure 4.1.1 (c), (d)

NO

Replace Main B /D

Waveform

YES

Control signal is Ok . See next page

to check RF signal path .

Control signal is Ok . See next page

to check RF signal path .

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Figure 4.1.1 (c)

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Figure 4.1.1 (d)

LGE Internal Use Only

CX9100

4.1.1.4 Checking RF signal path (Mobile S/W, Quintplexer)

Test Point

U100 Pin4

L101,C101,L132

DP100 PIN3

L114,C126,L118,C127

Circuit Diagram

TP1

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TP2

LGE Internal Use Only

CX9100

Start

Checking Flow

Check if there is any major difference referring

To Figure 4.1.1 (e). Is any signal detected at

Check if there is any major difference referring

To Figure 4.1.1 (f ). Is any signal detected at

Check pin2(TP1) at U100

that point?

YES

Is any signal detected at

that point?

YES

Check pin3(TP2) at DP100

that point?

YES

Is any signal detected at

that point?

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NO

Replace U100

Check L101,C101,L132

NO

Replace DP100

NO

Check L114,C126,L118,C127

NO

YES

RF signal path is OK. See next page to Rx I/Q data signal

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U100 pin2

Waveform

DP100 pin3

4.1.1 (e)

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4.1.1 (f)

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4.1.1.5 Checking Rx I/Q data

Test Point

U108

Pin7 (RX0_Q_M) Pin8 (RX0_Q_P) Pin9 (RX0_I_M) Pin10 (RX0_I_P)

Circuit Diagram

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CX9100

Start

Checking Flow

Check if there is any major difference referring

Redownload S/W, and then recalibrate the Main B/D

Check if there is any major difference referring

All DCN Rx check is completed . If the phone still do

Check pin7, 8, 9, 10 at U108

To Figure 4.1.1 (h), (i)

NO

Check pin7, 8, 9, 10 at U108

To Figure 4.1.1 (h), (i)

NO

not work , change Main B /D .

Waveform

YES

Replace U 108

Replace Main B /D

YES

Pin 7 & 8 (RX0_Q_M & RX0_Q_P) Pin 9 & 10 (RX0_I_M & RX0_I_P)

Z3X-BOX.COM

RX0_Q_P

RX0_Q_M

RX_Q_N

Graph 4.1.1(h)

-47-

RX0_I_P

RX0_I_M

RX_Q_N

Graph 4.1.1(i)

LGE Internal Use Only

CX9100

4.1.2 PCS Rx

Test Point

Mobile S/W

Quintplexer

RFR6500

Test Point

VCTCXO

Start

Rx TESTSETUP(Joyphone )

- Test C hannel: 675

-TestBand:USPCS

- SID: 4182

- Sect or P ower: - 30 dB m Spec trum Analyzer Setting

Oscilloscope Setting

Z3X-BOX.COM

1. Check

DC Power Supply circuit

2. Check VCTCXO

Checking Flow

3. Check

Control signal

4. Check

RF Signal path

NO

5. Check

Rx I/Q data

-48-

Redownload S/W, Cal

LGE Internal Use Only

CX9100

4.1.2.1 Checking DC Power supply circuit (PMIC)

Test Point

R431

C432

Circuit Diagram

TP1

TP2

Z3X-BOX.COM

-49-

LGE Internal Use Only

CX9100

Start

Checking Flow

Check C432(TP2)

+

2

85 V_ RX is OK?

.

YES

Check R431(TP1)

+2.6V_MSMP2 is OK?

YES

DC Po wer supply Circuit is OK. See next Page to check

VCTCXO circuit

NO

The Problem may be Logic part

Refer to Logic troubleshoot

The Problem may be Logic part

Refer to Logic troubleshoot

Z3X-BOX.COM

-50-

LGE Internal Use Only

CX9100

4.1.2.2 Checking VCTCXO circuit

R111

pin4

U107

pin3

Test Point

C181

TP2

Circuit Diagram

Z3X-BOX.COM

TP1

-51-

LGE Internal Use Only

CX9100

Start

Checking Flow

Check U107 pin3(TP1) Is it 19.2MHz? (Refer to

figure 4.1.2 (a))

NO

Check U107 pin4(TP2)

Is it 2.85 V? (Refer to

figure 4.1.2 (b))

YES

Replace U107 and then check R111 , C181 .

Is it similar?

NO

Replace Main B /D

VCTCXO circuit is Ok . See next page

YES

NO

YES

to check control signal .

The Problem may be Logic part

Referto Logic troubleshoot

VCTCXO circuit is Ok . See next page

to check control signal .

Z3X-BOX.COM

Figure 4.1.2 (a) Figure 4.1.2 (b)

Waveform

-52-

LGE Internal Use Only

CX9100

4.1.2.3 Checking Control signal

U108 pin49(SBST0)

pin50(SBDT0) pin51(SBCK0)

Test Point

Circuit Diagram

Z3X-BOX.COM

-53-

LGE Internal Use Only

CX9100

Start

Checking Flow

Check if there is any major difference referring

Check pin49, 50, 51 at U108

To Figure 4.1.2 (c), (d)

NO

Redownload S/W

Check pin49, 50, 51 at U108

To Figure 4.1.2 (c), (d)

NO

Replace Main B /D

Waveform

YES

Control signal is Ok . See next page

to check RF signal path .

Control signal is Ok . See next page

to check RF signal path .

Z3X-BOX.COM

Figure 4.1.2 (c)

-54-

Figure 4.1.2 (d)

LGE Internal Use Only

CX9100

4.1.2.4 Checking RF signal path (Mobile S/W, Quintplexer)

Test Point

U100 Pin4

L101,C101,L132

DP100 PIN4

L107,C120,L115,C121

Circuit Diagram

TP1

Z3X-BOX.COM

TP2

-55-

LGE Internal Use Only

CX9100

Start

Checking Flow

Check if there is any major difference referring

To Figure 4.1.2 (e). Is any signal detected at

Check if there is any major difference referring

To Figure 4.1.2 (f ). Is any signal detected at

Check pin2(TP1) at U100

that point?

YES

Is any signal detected at

that point?

YES

Check pin4(TP2) at DP100

that point?

YES

Is any signal detected at

that point?

Z3X-BOX.COM

YES

NO

Replace U100

Check L101,C101,L132

NO

Replace DP100

NO

Check L107,C120,L115,C121

NO

RF signal path is OK. See next page to Rx I/Q data signal

-56-

LGE Internal Use Only

CX9100

U100 pin2

Waveform

DP100 pin4

4.1.2 (e)

Z3X-BOX.COM

4.1.2 (f)

-57-

LGE Internal Use Only

CX9100

4.1.2.5 Checking Rx I/Q data

Test Point

U108

Pin7 (RX0_Q_M) Pin8 (RX0_Q_P) Pin9 (RX0_I_M) Pin10 (RX0_I_P)

Circuit Diagram

Z3X-BOX.COM

-58-

LGE Internal Use Only

CX9100

Start

Checking Flow

Check if there is any major difference referring

Redownload S/W, and then recalibrate the Main B/D

Check if there is any major difference referring

All DCN Rx check is completed . If the phone still do

Check pin7, 8, 9, 10 at U108

To Figure 4.1.2 (h), (i)

NO

Check pin7, 8, 9, 10 at U108

To Figure 4.1.2 (h), (i)

NO

not work , change Main B /D .

Waveform

YES

Replace U 108

Replace Main B /D

YES

Pin 7 & 8 (RX0_Q_M & RX0_Q_P) Pin 9 & 10 (RX0_I_M & RX0_I_P)

Z3X-BOX.COM

RX0_Q_P

RX0_Q_M

RX_Q_N

Graph 4.1.1(h)

-59-

RX0_I_P

RX0_I_M

RX_Q_N

Graph 4.1.1(i)

LGE Internal Use Only

CX9100

4.2 Tx Part Trouble Shooting

4.2.1 DCN Tx

Mobile S/W

Test Point

DUAL PAM

Tx DUAL SAW Filter

RFT6150

Checking Flow

Start

Press “##5473784236368” + “SEND” key + “000000” in Phone idle state.

Press “6” to enter FCC Test Press “2” to enter CDMA FCC mode

- Set channel to 384 and AGC to 360

Measure frequency domain waveform with Spectrum

analyser

Measure time domain waveform with Oscilloscope

Z3X-BOX.COM

Quintplexer

VCTCXO

Checking Flow

4. Check

RF Dual SAW

5. Check

RF Dual PAM

6. Check

Quintplexer

1. Check

DC Power Supply circuit

2. Check VCTCXO

3. Check RFT6150

-60-

NO

7. Check

Mobile Switch

Redownload S/W, Cal

LGE Internal Use Only

CX9100

4.2.1.1 Checking DC Power supply circuit (PMIC)

Test Point

R431

C435

Circuit Diagram

TP1

Z3X-BOX.COM

TP2

-61-

LGE Internal Use Only

CX9100

Start

Checking Flow

Check C435(TP2)

+

2

85 V_ TX is OK?

.

YES

Check R431(TP1)

+2.6V_MSMP2 is OK?

YES

DC Po wer supply Circuit is OK. See next Page to check

VCTCXO circuit

NO

The Problem may be Logic part

Refer to Logic troubleshoot

The Problem may be Logic part

Refer to Logic troubleshoot

Z3X-BOX.COM

-62-

LGE Internal Use Only

CX9100

4.2.1.2 Checking VCTCXO circuit

R111

pin4

U107

pin3

Test Point

C181

TP2

Circuit Diagram

Z3X-BOX.COM

TP1

-63-

LGE Internal Use Only

CX9100

Start

Checking Flow

Check U107 pin3(TP1) Is it 19.2MHz? (Refer to

figure 4.2.1 (a))

NO

Check U107 pin4(TP2)

Is it 2.85 V? (Refer to

figure 4.2.1 (b))

YES

Replace U107 and then check R111 , C181 .

Is it similar?

NO

Replace Main B /D

VCTCXO circuit is Ok . See next page

YES

NO

YES

to check control signal .

The Problem may be Logic part

Referto Logic troubleshoot

VCTCXO circuit is Ok . See next page

to check control signal .

Z3X-BOX.COM

Figure 4.2.1 (a) Figure 4.2.1 (b)

Waveform

-64-

LGE Internal Use Only

CX9100

4.2.1.3 Checking RFT6150 circuit

TX_Q_P

TX_Q_M

TX_I_P

TX_I_M

Test Point

PIN23

PIN 27 PIN 28 PIN 29 PIN 30

PIN 1, 2, 3, 4

PIN15

U109

CELL_OUT

TCXO

TX_ON, SBCK0, SBDT0, SBST0

Circuit Diagram

TP1

Z3X-BOX.COM

TP3

TP4

TP2

-65-

TP5

LGE Internal Use Only

CX9100

Start

Checking Flow

Check if there is any major difference referring

Check pin23(TP1) at U109

To Figure 4.2.1 (c ). Is it similar?

YES

Check I/Q data(TP2) at U109

Check if there is any major difference referring

To Figure 4.2.1 (d ). Is it similar?

YES

Check pin1(TP3) at U109(TX_ON )

whether it is higher than 2.5V.

YES

Check pin15(TP4) at U109(TCXO )

referring to Figure 4.2.1(e). Is it similar?

YES

RFT6150 circuit is OK. See next page

Check U 202 MSM6550

NO

Check TX_ON signal & MSM

NO

Check TCXO circuit.

NO

YES

Check pin2, 3, 4(TP5) at U109

Referring to Figure 4.2.1(f) Is it similar?

YES

Z3X-BOX.COM

Replace U109

NO

Check SBI signal line & MSM

-66-

LGE Internal Use Only

CX9100

Waveform

Graph 4.2.1(c) Graph 4.2.1 (e)

RX0_Q_P

RX0_Q_M

SBDT

SBCK

RX0_I_P

RX0_I_M

Graph 4.2.1(d)

Z3X-BOX.COM

SBST

SBCK

Graph 4.2.1 (f)

-67-

LGE Internal Use Only

CX9100

4.2.1.4 Check RF Tx Dual SAW (DCN)

Test Point

U105

(Dual PAM)

D_OUT

F101

D_IN

U109

(RFT6150)

Checking Flow

Circuit Diagram

TP2

Waveform

TP1

Start

Check pin1(TP1)

at F101 . Referring to

Figure 4 .2 .1(g)

Is it similar ?

Check pin9(TP2)

at F101 . Referring to

Figure 4 .2 .1(h)

Is it similar ?

NO

Replace F 101

D_IN fed up with CW signal

D_IN

Check

U109(RFT6150)

YES

Z3X-BOX.COM

RF Tx Dual SAW is

OK

YES

Figure 4.2.1(g)

D_OUT

-68-

Figure 4.2.1(h)

LGE Internal Use Only

CX9100

4.2.1.5 Check Dual PAM (DCN) circuit

Test Point

RFOUT_CELL

VEN_CEL

L

VCCA

(Dual PAM)

RFIN_CELL

U105

VMODE

VBAT

T

Circuit Diagram

PCS Tx DCN Tx

TP1

TP4

Z3X-BOX.COM

TP2

TP3

-69-

LGE Internal Use Only

CX9100

Start

Checking Flow

Check pin 2 ,13 (TP1,2) at U105

Check if there is any major difference referring

To Figure 4.2.1(i) Is it similar?

YES

Check pin 4 , 11

whether it is higher than 3.4V.

Check pin3(TP4) at U105(PA_R1 signal)

whether it is lower than 2.2V.

(TP3) at U105(Vcc)

YES

Replace U105

YES

PAM circuit is OK. See next page

Check Vcc line

NO

Check PA_R1 line

NO

Waveform

RFIN_CELL fed up with CW signal

in low gain mode of PAM

Z3X-BOX.COM

Figure 4.2.1(i)

Waveform

RF_IN

-70-

RFOUT_CELL

LGE Internal Use Only

CX9100

4.2.1.6 Check Quintplexer (DCN)

Test Point

U103

C115

CELL_TX_PORT

Test Point

ANT_PORT

L132

kwXWW

OxP

TP2

TP3

Circuit Diagram

R127

R126 0

0

L100

6.8n

R129

C102

0

1.5p

R128

C160

0

DNI

1

IN(ANT)

34

U100

RF-800

2

OUT(DUP)

L101

Z3X-BOX.COM

47n

C101

100p

L132

1.8n

TP2

+/-1%

CP0402A0836BNTR

1

4

R103

49.9

CP0402A1880ENTR

3

2

U103

IN

COUPLING

TP1

U102

50OHM

OUT

50OHM

COUPLING

1608

10u

2

3

4

IN

1

78

L109

C123

1n

20p

C115 3p

C116

1.5p

L133

5.6n

C124

C114

5p

2.2n

L113

DNI

DCN T PCS T

TP2

DP100

ACFM-7102

6

ANT

CELL_TX

CELL_RX

G_SLUG

7

PCS_TX

PCS_RX

1

2

3

4

5

GPS

L104

5.6n

C105 DNI

TP3

DCN Rx PCS Rx GPS

L114

L107

1n

L110 DNI

5.6n C120 56p

C121

3.3n

L116 DNI

L115 27n

-71-

LGE Internal Use Only

CX9100

4.2.1.6 Check Quintplexer (DCN)

Checking Flow

Start

Check TP1 , TP2

at DP 100 . Referring to

Figure 4.2.1(j)

Is it similar ?

NO

Check TP2 , TP3

at DP 100 . Referring to

Figure 4.2.1(j)

Is it similar ?

NO

Check TP1 , TP3

at DP 100 . Referring to

Figure 4.2.1(j)

Is it similar ?

NO

Replace DP

100 , U103

Quintplexer,

Coupler are OK

YES

Replace U103

(coupler)

YES

Replace DP100

(Quintplexer)

YES

Waveform

Z3X-BOX.COM

Tx Port

Figure 4.2.1(j)

-72-

ANT Port

LGE Internal Use Only

CX9100

4.2.1.7 Check Mobile S/W

Test Point

RF IN

RF OUT

Checking Flow

Circuit Diagram

TP2

TP1

Waveform

Start

Check pin2(TP1) , 1(TP2) at U100 . Referring to

Figure 4.2.1(k)

Is it similar ?

NO

Replace U100

RF_IN(ANT)

Mobile S/W is

OK

YES

Z3X-BOX.COM

RF_OUT(DUP)

Figure 4.2.1(k)

-73-

LGE Internal Use Only

CX9100

4.2.2 PCS Tx

Mobile S/W

Test Point

DUAL PAM

Tx DUAL SAW Filter

RFT6150

Circuit Diagram

Start

Press “##5473784236368” + “SEND” key + “000000” in Phone idle state.

Press “6” to enter FCC Test Press “2” to enter PCS FCC mode

- Set channel to 600 and AGC to 360

Measure frequency domain waveform with Spectrum

analyser

Measure time domain waveform with Oscilloscope

Z3X-BOX.COM

Quintplexer

VCTCXO

Circuit Diagram

4. Check

RF Dual SAW

5. Check

RF Dual PAM

6. Check

Quintplexerr

1. Check

DC Power Supply circuit

2. Check VCTCXO

3. Check RFT6150

-74-

NO

8. Check

Mobile Switch

Redownload S/W, Cal

LGE Internal Use Only

CX9100

4.2.2.1 Checking DC Power supply circuit (PMIC)

Test Point

R431

C435

Circuit Diagram

Z3X-BOX.COM

-75-

TP1

TP2

LGE Internal Use Only

CX9100

Start

Checking Flow

Check C435(TP2)

+

2

85 V_ TX is OK?

.

YES

Check R431(TP1)

+2.6V_MSMP2 is OK?

YES

DC Po wer supply Circuit is OK. See next Page to check

VCTCXO circuit

NO

The Problem may be Logic part

Refer to Logic troubleshoot

The Problem may be Logic part

Refer to Logic troubleshoot

Z3X-BOX.COM

-76-

LGE Internal Use Only

CX9100

4.2.2.2 Checking VCTCXO circuit

R111

pin4

U107

pin3

Test Point

C181

TP2

Circuit Diagram

Z3X-BOX.COM

TP1

-77-

LGE Internal Use Only

CX9100

Start

Checking Flow

Check U107 pin3(TP1) Is it 19.2MHz? (Refer to

figure 4.2.2 (a))

NO

Check U107 pin4(TP2)

Is it 2.85 V? (Refer to

figure 4.2.2 (b))

YES

Replace U107 and then check R111 , C181 .

Is it similar?

NO

Replace Main B /D

VCTCXO circuit is Ok . See next page

YES

NO

YES

to check control signal .

The Problem may be Logic part

Referto Logic troubleshoot

VCTCXO circuit is Ok . See next page

to check control signal .

Z3X-BOX.COM

Figure 4.2.2 (a) Figure 4.2.2 (b)

Waveform

-78-

LGE Internal Use Only

CX9100

4.2.2.3 Checking RFT6150 circuit

TX_Q_P

TX_Q_M

TX_I_P

TX_I_M

Test Point

PIN23

PIN 27 PIN 28 PIN 29 PIN 30

PIN 1, 2, 3, 4

PIN15

U109

CELL_OUT

TCXO

TX_ON, SBCK0, SBDT0, SBST0

Circuit Diagram

TP1

Z3X-BOX.COM

TP3

TP4

TP2

-79-

TP5

LGE Internal Use Only

CX9100

Start

Checking Flow

Check if there is any major difference referring

Check pin23(TP1) at U109

To Figure 4.2.2 (c ). Is it similar?

YES

Check I/Q data(TP2) at U109

Check if there is any major difference referring

To Figure 4.2.2 (d ). Is it similar?

YES

Check pin1(TP3) at U109(TX_ON )

whether it is higher than 2.5V.

YES

Check pin15(TP4) at U109(TCXO )

referring to Figure 4.2.2(e). Is it similar?

YES

RFT6150 circuit is OK. See next page

Check U 202 MSM6550

NO

Check TX_ON signal & MSM

NO

Check TCXO circuit.

NO

YES

Check pin2, 3, 4(TP5) at U109

Referring to Figure 4.2.2(f) Is it similar?

Z3X-BOX.COM

YES

Replace U109

-80-

NO

Check SBI signal line & MSM

LGE Internal Use Only

CX9100

Waveform

Graph 4.2.2(c) Graph 4.2.2 (e)

RX0_Q_P

RX0_Q_M

SBDT

SBCK

RX0_I_P

RX0_I_M

Graph 4.2.2(d)

Z3X-BOX.COM

SBST

SBCK

Graph 4.2.2 (f)

-81-

LGE Internal Use Only

CX9100

4.2.2.4 Check RF Tx Dual SAW

Test Point

U105

(Dual PAM)

F101

U109

(RFT6150)

Checking Flow

P_OUT

P_IN

Circuit Diagram

Waveform

TP1TP2

Start

Check pin4(TP1)

at F101 . Referring to

Figure 4 .2 .2(g)

Is it similar ?

Check pin6(TP2)

at F101 . Referring to

Figure 4 .2 .2(h)

Is it similar ?

NO

Replace F 101

D_IN fed up with CW signal

P_IN

Check

U109(RFT6150)

YES

Z3X-BOX.COM

RF Tx Dual SAW is

OK

YES

Figure 4.2.2(g)

P_OUT

-82-

Figure 4.2.2(h)

LGE Internal Use Only

CX9100

4.2.2.5 Check Dual PAM (PCS) circuit

Test Point

VCCAVCC

U105

(Dual PAM)

VMODE RFIN_PCS

VBATT

RFOUT_PCS

VEN_PCS

Circuit Diagram

TP1

PCS Tx DCN Tx

TP4

Z3X-BOX.COM

TP2

TP3

-83-

LGE Internal Use Only

CX9100

Checking Flow

Start

Check pin 6 , 8 (TP1,2) at U105

Check if there is any major difference referring

To Figure 4.2.2(i) Is it similar?

YES

PAM circuit is OK. See next page

Check pin 4 , 11

whether it is higher than 3.4V.

Check pin3(TP4) at U105(PA_R1 signal)

whether it is lower than 2.2V.

(TP3) at U105(Vcc)

YES

Replace U105

Z3X-BOX.COM

RFIN_PCS fed up with CW signal

Waveform

NO

Check Vcc line

Check PA_R1 line

NO

in low gain mode of PAM

Figure 4.2.2(i)

-84-

RFOUT_PCS

LGE Internal Use Only

CX9100

4.2.2.6 Check Quinplexer (PCS)

Test Point

PCS_TX_PORT

ANT_PORT

L132

DP100

(Quintplexer)

C116

U102

Circuit Diagram

TP1

TP3

Z3X-BOX.COM

-85-

TP3

LGE Internal Use Only

CX9100

Checking Flow

Start

Check TP1 , TP2

at DP 100 . Referring to

Figure 4.2.2(j)

Is it similar ?

NO

Check TP2 , TP3

at DP 100 . Referring to

Figure 4.2.2(j)

Is it similar ?

NO

Check TP1 , TP3

at DP 100 . Referring to

Figure 4.2.2(j)

Is it similar ?

NO

Replace DP

100 , U102

Quintplexer,

Coupler are OK

YES

Replace U102

(coupler)

YES

Replace DP100

(Quintplexer)

YES

Waveform

Z3X-BOX.COM

Tx Port

Figure 4.2.2(j)

-86-

ANT Port

LGE Internal Use Only

CX9100

4.2.2.7 Check Mobile S/W

Test Point

RF IN

RF OUT

Checking Flow

Circuit Diagram

TP2

TP1

Waveform

Start

Check pin2(TP1) , 1(TP2) at U100 . Referring to

Figure 4.2.2(k)

Is it similar ?

NO

Replace U100

RF_IN(ANT)

Mobile S/W is

OK

YES

Z3X-BOX.COM

RF_OUT(DUP)

Figure 4.2.2(k)

-87-

LGE Internal Use Only

CX9100

4.3 Logic Part Trouble Shooting

4.3.1 Power

4.3.1.1 Power-On Trouble

Circuit Diagram

+VBATT

Circuit Diagram

+VPWR

+1.275V_MSMC

+1.85V_MSMP1

PS_HOLD

R409

L400

L401

C423

Test point

R431

+2.6V_MSMP2

R435

+2.6V_MSMA

+2.85V_TCXO

R437

PS_HOLD

+2.6V_MSMP2

Z3X-BOX.COM

+1.275V_MSMC

+1.85V_MSMP1

U401

+VBATT

+VPWR

+2.6V_MSMA

+2.85V_TCXO

-88-

U107

TCXO_OUT

LGE Internal Use Only

CX9100

START

Checking Flow

Check battery voltage > 3.4V

YES

Check the VPWR voltage > 3.4V

YES

Check the voltage of

the following port at U401

+1.275V_MSMC

+1.85V_MSMP1

+2.6V_MSMP2

+2.6V_MSMA

+2.85V_TCXO

YES

Is the frequency of TCXO (U107)

19.2Mhz?

NO

Charge of Change Battery and try again

Confirm +VBATT Line

Replace PMIC (U401)

Check VPWR Voltage >3.4V

Replace TCXO (U107)

YES

download software

try again

Z3X-BOX.COM

Logic level at PS_HOLD

Of U401=High?

YES

Change the board

NO

-89-

Replace MSM (U202)

Does it work properly?

NO

Change the board

LGE Internal Use Only

CX9100

4.3.1.2 Charging Trouble

+VBATT

Circuit Diagram

USB_DETECT

+VBATT

VCHAR

CON603

Test point

+VCHAR

Z3X-BOX.COM

USB_DETECT

-90-

Q602

CON603

LGE Internal Use Only

CX9100

START

Battery Change

Checking Flow

Does it work properly

NO

Charging Connector CON603

Well-soldered?

YES

VCHAR (D602) =5V?

YES

USB_DECT(C646)

If connect USB Cable, 2.6V

If connect TA, 0V ?

YES

Check VBATT Voltage >3.4V

Z3X-BOX.COM

YES

NO

The battery may have the problem

Re-soldering CON603

The charging adaptor (TA) or USB cable(USB port

of computer) is out of order.

Replace Q602

Replace PMIC (U401)

download software

try again

Does it work properly

YES

Charging will operate properly

NO

-91-

The battery may have the problem

LGE Internal Use Only

CX9100

4.3.2 LCD

4.3.2.1 LCD Trouble

Check point

- The assembly status of the LCD Module

- The assembly status of the main connector

- The Soldering of connector

Circuit Diagram

D2[11] D2[13] D2[15]

SLCD_CS/

MLCD_CS/ MLCD_VSYNC SLCD_VSYNC

D2[1] D2[3] D2[5] D2[7]

D2[9]

F506

ICVE10184E150R101FR

9

OUT1

8

OUT2

7

OUT3

6

OUT4

F509

ICVE10184E150R101FR

9

OUT1

8

OUT2

7

OUT3

6

OUT4

F505

ICVE10184E150R101FR

9

OUT1

8

OUT2

7

OUT3

6

OUT4

R511

F506

1

IN1

2

IN2

3

IN3

4

IN4

GND

5

10

F509

1

IN1

2

IN2

3

IN3

4

IN4

GND

5

10

F505

1

IN1

2

IN2

3

IN3

4

IN4

GND

5

10

SUB_KEY_LED_EN

FOLDER_ON_SW

LCD_IFMODE

KYPD[1] KYPD[3]

KYPD[5]

KYPD[7]

KYPD[9] KYPD[11] KYPD[13] KYPD[15] KYPD[17]

LCD_BL_OUT

MLED5 MLED4 MLED3 MLED2

MLED1

R509

OE2/

0

R510

DNI

100

33p

0.1u

33p

C504

C507

C505

C510

C503 33p

C506 33p

C544 ICVS0505500FR

C546

CON501

AXT570124

1

70

2

69

3

68

4

67

5

66

6

65

7

64

8

63

9

DUMMY

71 7372 74

62

61

60

59

58

57

56

55

54

53

52

51

50

49

48

47

46

45

44

43

42

41

40

39

38

37

36

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

33p

10n

C501

C502

Test point

ICVS0505500FR

1u

C545

C518

SPK_R+ SPK_R-

SPK_LSPK_L+

82n

L501

L502

ICVS0505500FR

0.1u

C500

ICVS0505500FR

C512

C513

C516

C517

RCV+

82n

RCV-

SLED1 SLED2

+1.85V_MSMP1 +2.8V_LCD

LCD_ID

+VPWR

+3.0V_MOTOR

33p

0.1u

C508

C509

C520 0.1u

C519

F504

ICVE10184E150R101FR

9

OUT1

8

OUT2

7

OUT3

6

OUT4

F508

ICVE10184E150R101FR

9

OUT1

8

OUT2

7

OUT3

6

OUT4

GND

F503

ICVE10184E150R101FR

9

OUT1

8

OUT2

7

OUT3

6

OUT4

GND

F504

1

IN1

D2[0]

2

IN2

D2[2]

3

IN3

D2[4]

4

IN4

D2[6]

GND

5

10

F508

1

IN1

D2[8]

2

IN2

D2[10]

3

IN3

D2[12]

4

IN4

D2[14]

5

10

F503

1

IN1

WE2/

2

IN2

LCD_RS

3

IN3

SLCD_RESET/

4

IN4

MLCD_RESET/

5

10

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F503

F508

F504

-92-

F505

F509

F506

LGE Internal Use Only

CX9100

START

Checking Flow

Does LCD work properly

YES

Check the LCD FPCB

YES

Check the C431 (2.85V) and C406(1.85V)

of PMIC Voltage

YES

Check the Control Signal LCD Data[0:15]

Reset/, LCD_CS, LCD_WE/

NO

Change the LCD Module

Change the LCD FPCB

Replace PMIC ( U401 )

Check the LCD Signal Line

( F503,F504,F505,F506,F508,F509)

YES

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Check CON 501 soldering

YES

LCD Display will work properly

NO

-93-

Re-solder CON 501

LGE Internal Use Only

CX9100

4.3.3 Camera

4.3.3.1 Camera Trouble

Circuit Diagram

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Test point

-94-

LGE Internal Use Only

CX9100

Checking Flow

Z3X-BOX.COM

-95-

LGE Internal Use Only

CX9100

Camera Trouble

Circuit Diagram

Z3X-BOX.COM

-96-

LGE Internal Use Only

CX9100

Test point

Checking Flow

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-97-

LGE Internal Use Only

CX9100

4.3.4 Audio

4.3.4.1 Speaker Trouble

Circuit Diagram

R301 HPH_L R302 HPH_R

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U301 Audio Amp

Test point

R306 VPWR+

-98-

C315 SPK_R+/-

C314 SPK_L+/-

LGE Internal Use Only

CX9100

START

Checking Flow

Voltage at R306 is

about 3.4~4.2V

YES

Check audio signal at R301, R302

YES

Check audio signal at C314, C315

YES

Check the state of contact of speaker

YES

Speakerwill work properly

NO

Check the Battery Voltage

Check the soldering at

R301, R302

YES

Check the soldering at

C314, C315

YES

Replace speaker

NO

Replace MSM or Main Board

Resolder R301, R302

Replace U301

Resolder C314, C315

Z3X-BOX.COM

-99-

LGE Internal Use Only

LG CX9100 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual