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Motorola T720 Service Manual
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Motorola T720 Service Manual

Motorola T720 Service Manual

Digital wireless telephone
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Service Manual
Level 3
TM
DIGITAL WIRELESS TELEPHONE
Model T720
CDMA 1900MHz/ CDMA 800MHz

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Summary of Contents for Motorola T720

  • Page 1: Duplexer

    Service Manual Level 3 DIGITAL WIRELESS TELEPHONE Model T720 CDMA 1900MHz/ CDMA 800MHz...
  • Page 2 Motorola. Furthermore, the purchase of Motorola products shall not be deemed to grant either directly or by implication, estoppel, or otherwise, any li-...

  • Page 3: Table Of Contents

    Advantages of CDMA 1X………………………….. 7 RF Side Block Diagram………………………………….. 2 3 Key Product Features……………………………….. 8 Accessory Conncetor……………………….………. 8 Disassembly Procedure…………………………….…… 25 T720 Audio Logic IC's………………………………. 8 Introduction………………………………………………. 2 5 Brief IC functional description………………………8 Removing battery………………………………………… 25 CDMA-PCS 1900 Mhz Band………………………..10 Disassembly Procedure…………………………………..28...

  • Page 4: Rfr3300

    Introduction…………………………….……………. 61 Troubleshooting and Repair………………………………. Testing after Repair…………………………………. 61 No turn on debug procedure……………………….. 62 Internal charger test debugging……………………. Transmitter Troubleshooting………………………………………… T720 Troubleshooting……………………………… 67 Blco Diagram………………………………………….68 Antenna……………………………………………….69 Duplexer………………………………………………. 7 1 Power Detector…………….………………………… 72 RFR3300…………………...…..………….………….. 7 4 Amps IF Filter……………………………….………. 77 GPS IF………….………………..…………………….

  • Page 5: Introduction

    T720 Contents This page is intentionally left blank. © 2002 Motorola, Inc.

  • Page 6: Product Description

    T720 Personal Communications Sector T720 W/AGPS T720 IC description: 1. 1.Qualcomm IC’s: — MSM5100 T720 is similar as V 120X in — PM1000 functionality except that it also has the — RFR3300 Assisted Global Positioning System. — IFR3000 AGPS helps in 911 emergency calls to track —...

  • Page 7: Cdma Dual Band Trimode Phone

    T720 - CDMA Dual Band Tri Mode Phone display prompt. See incoming call and service status. T720 also known as CDMA 1X is a CDMA2000 Headset Jack Insert headset 1XRTT version of V.120C. It uses Qualcomm chip Right Soft Key accessory for set and software.

  • Page 8: Key Product Features

    — PA's: U170 & U401 — Up to 500 names and number entries in address book with unlimited entries per 2. Non Qualcomm Baseband IC is used in T720 name — U1201: 32 Mbit (4 Mbyte) Intel Sawtooth — Add distinctive alert to selected address...

  • Page 9: Cdma-Pcs 1900 Mhz Band

    The lowest valid channel number is 25. 1880.00 1960.00 The highest valid number is 1175. 1890.00 1970.00 Total Number of valid channel numbers is 46. 1000 1900.00 1980.00 CDMA 1900MHz Performance Specifications 1175 1908.50 1988.50 General. © 2002 Motorola, Inc.
  • Page 10 Transmit Duty Cycle Variable- full, 1/2, 1/4, 1/8 rate(CDMA Mode) CDMA Transmit Waveform 0.94 Quality(rho) Receive Sensitivity -104dBm(CDMA, 0.5% Static FER, 8kbps Vocoder) Displays Large 120X160 transflective CSTN module with 4096 colors. CLI Display, 96X32 FSTN. © 2002 Motorola, Inc.

  • Page 11: Specifications

    313 to 354. A -System preferred channels: primary =283, Secondary = 691 B- System preferred channels: Primary =384, Secondary = 777 The lowest valid CDMA channel is 1013. The highest valid CDMA channel is 777. © 2002 Motorola, Inc.
  • Page 12 1/2, 1/4, 1/8 rate (CDMA Mode) CDMA Transmit 0.94 Waveform Quality(Rho) Receiver Sensitivity -116 dBm (AMPS, SINAD, C-MSG weighted) Sinad 12dB or greater -104 dBm (CDMA, 0.5% Static FER) 0.5% or less Alternate Channel -60 db@+/- 60kHz (Amps) Desense Protection © 2002 Motorola, Inc.

  • Page 13: Environmental

    • TIA/EIA/IS-98 Recommended Minimum Performance Standards for Dual- Mode Wide band Spread spectrum Cellular Mobile Stations. Specifications subject to change without notice. © 2002 Motorola, Inc.

  • Page 14: Foreward

    Model and Kit Identification repair of Motorola Cellular products. Orders Motorola products are specifically identified by an for all parts should be sent to the Motorola overall model number on the product label. In most International Logistics Department at the fol-...

  • Page 15: Genaral Safety Information

    DO NOT operate the telephone in an airplane. All equipment must be properly grounded according to installation instructions for safe oper- DO NOT allow children to play with any radio ation. equipment containing a transmitter. © 2002 Motorola, Inc.

  • Page 16: Cellular Overview

    With • Variable rate vocoder. CDMA, unique digital codes, rather than sepa- rate RF frequencies or channels are used to • Soft hand off. differentiate subscribers. ©2002 Motorola, Inc.

  • Page 17: Hypothetical Cell System

    Since this radiotelephone is dual mode, the radiotelephone can operate in either a CDMA system or Analog system. © 2002 Motorola, Inc.

  • Page 18: Circuit Description & Theory Of Operation

    Circuit Description & Theory Of Operation Personal Communications Sector T720 T720- CIRCUIT DESCRIPTION AND integrated CODEC or audio amplifiers, it has THEORY OF OPERATION 8 LDO voltage regulators, it doesn’t have internal charge controller, instead it requires external regulated voltage and current for...

  • Page 19: Rf Section

    • RF to IF analog receive IC, it contains the short circuit protection. programmable cellular LNA gain control for all three bands and four modes and the Mixer T720 does not support no battery/dead battery (down converter) operation with fast charger since current is limited to 1A by hardware.

  • Page 20: Rft3100

    Two PA's module one for Cel- signals within the baseband(Zero-IF) and lular & 800 CDMA Band and PCS Band PA then filtered through low pass filter and then No PA biasing get A/D conversion. This is then output from © 2002 Motorola, Inc.

  • Page 21: Transmitter Section

    The transmitter section occupies a frequency band of 824 Mhz to 849 Mhz in cellular band and a frequency band of 1850Mhz to 1910Mhz in PCS band. © 2002 Motorola, Inc.

  • Page 22: Receiver Audio

    TX_I, TX_Q, TX_IN and TX_QN. This C_RX_Q(DATA0, DATA1,DATA2,DATA3) modulates on the TX IF (QPSK Modulation) and C_RX_I(DATA2,DATA3), 228.6Mhz (263.6Mhz for PCS). FM_RX_IDATA, FM_RX_QDATA these signals carries the baseband signal of the receive digital call to MSM5100. © 2002 Motorola, Inc.

  • Page 23: Rf Side Block Diagram

    Circuit Description & T720 Theory of Operation RF SIDE BLOCK DIAGRAM © 2002 Motorola, Inc.
  • Page 24 Circuit Description & T720 Theory of Operation This Page is intentionally left blank. © 2002 Motorola, Inc.

  • Page 25: Disassembly Procedure

    Antenna Antenna Disassembly Disassembly Ensure the phone is turned off. Grab the Bottom of the Antenna Assembly Unscrew the Antenna from the Housings Lift the Antenna and Antenna Bushing away from Housings...
  • Page 26 Battery Door Battery Door Disassembly Disassembly Push down the Battery Door Latch Gently lift the Battery Door away from the Rear Housing Battery Disassembly Battery Disassembly Remove the Battery Door as described in the Procedures. Slide the Battery in the direction of the Arrow Lift the Top end of the Battery near the Antenna up...
  • Page 27 RF Grommet RF Grommet Disassembly Disassembly Use the Pointed end of the Plastic Disassembly Tool. Put the Tool at the Top of the RF Grommet and pull up.

  • Page 28: Disassembly Procedure

    Rear Housing Rear Housing Disassembly (1) Disassembly (1) Using a T-Driver with a T-7 bit, remove the 3 screws from the Rear Housing There are the Snap Fits on both side of the Rear Housing. Pry them with the bezel stick and release both Snap Fits as shown in the picture below.
  • Page 29 Rear Housing Rear Housing Disassembly (2) Disassembly (2) After releasing the Snap fits, the bottom portion of the Rear housing can be disassembled. Use the bezel stick, push the Top Portion of the side button , to release the Top Snap Fit.
  • Page 30 Rear Housing Rear Housing After releasing the Top Snap fit, the Rear Disassembly (3) Disassembly (3) Housing is unlocked at the Top Snap fit. Pulling up the phone from the Bottom of the Phone to the Top .
  • Page 31 Engine PCB Engine PCB Pull up the Bottom side of the PCB Assembly Disassembly (1) Disassembly (1) Use the Disassembly Tool . Put the Edge into the Hole of “Board to Board Spacer ”...
  • Page 32 Engine PCB Use the Disassembly Tool . Put the Edge into Engine PCB the Hole of “Board to Board Spacer ” Disassembly (2) Disassembly (2) Twist the Disassembly Tool, putting the Tool into Hole of the “Board to Board Spacer”...
  • Page 33 Use the Disassembly Tool Personality PCB Personality PCB Slide the other Edge of the Disassembly Tool Disassembly Disassembly into the Flex Cable Connector Pull up the Flex Cable Connector.
  • Page 34 Use the Disassembly Tool Alert Lens Disassembly Alert Lens Disassembly Put the Tool into the Hinge Area of the Base Front Housing Push the Alert Lens to the Bottom Use the “Flip Disassembly Tool” Flip Assembly Parts Flip Assembly Parts Put the “Assembly with Base Front Housing Disassembly (1) Disassembly (1)
  • Page 35 Flip Assembly Parts Flip Assembly Parts Push Down ( Twist ) the Grip Disassembly (2) Disassembly (2) Pull up the Flip Assembly Flip Cover Disassembly Flip Cover Disassembly Put thumb into the Hole between Flip Cover and Flip Main Housing. Pull up the Flip Cover .

  • Page 36: Removing Flip Assembly

    Using a T-Driver with a T-7 bit, remove the 4 LCD Module , Main LCD Module , Main screws from the LCD Module and then Lens Lens disassemble LCD Module from Flip Main Housing. and CLI Lens and CLI Lens Using your thumb , apply firm even pressure to Disassembly Disassembly...
  • Page 37 Antenna Tube Antenna Tube Disassembly Disassembly Using bezel Stick , put the stick at the Top Hole of the Antenna Tube to pull up. Disassembling the Antenna Tube from Rear Housing.
  • Page 38 Battery Contact Battery Contact Using the bezel Stick, put it on the Top of the Battery Contact. Disassembly Disassembly Push down the Battery Contact , follow the Picture.
  • Page 39 Insert the Rubber Bumper on the Front side of Rubber Bumper Rubber Bumper the Base Front Housing Assembly Assembly Using a Tool, which has “Long Nose” ,draw the Legs of the Bumper . Using the Cutting Tool, cut the Legs of the Bumper on the Inside of the Front Housing.
  • Page 40 Circuit Description & T720 Theory of Operation This Page is intentionally left blank. © 2002 Motorola, Inc.

  • Page 41: Product Support Tools

    Personal Communications Sector T720 PRODUCT SUPPORT TOOLS FLASHING/FLEXING/NAM PROGRAM- MING T720 is a Qualcomm chipset based and it About Junior board operation: uses the 17 pin CE Bus Connector which uses the RS232 & USB communication protocols. The T720 will...

  • Page 42: Junior Box Setup

    0109742L73 Wibu key FRONT FRONT SKN6304B SKN6304B CE BUS CABLE CE BUS CABLE SERIAL CABLE Cable SKN6315A BACK BACK Data Head SYN0279A SPN4029A SPN4029A POWER SUPPLY Transformer Transformer 4.2 V 1.5 A INTERFACE ADAPTER POWER SUPPLY SKN4996A © 2002 Motorola, Inc.

  • Page 43: Test And Phasing

    TEST AND PHASING Gate 24 supports the testing and phasing of T720 product, For more details on Test and Phasing contact Service Test Engineering Group. E R I A L P O W D E T R E F O U TP U T...

  • Page 44: Test Procedure

    Test Procedures CDMA T720 RF Cable Test To test the RF cable D U P LE X TE ST for proper loss: Tx Fr equency AC Level Tune Freq should be set to ï TX frequency: 834.990000 MHz. Tx P ow er...

  • Page 45: Setup For Analog Call

    If the mobile responds, you will see theAccess annunciator light briefly. Answer the call by raising the flip or press SEND on the mobile to start the con- versation. The Connect annunciator lights. This is the Connect state. Motorola Confidential Proprietary...

  • Page 46: Rx Sensitivity Test (Sinad)

    Test Procedures CDMA T720 RX Sensitivity Test (SINAD) R X TEST Communications Analyzer Setup SIN AD AC Le vel 0.6336 ï Select RX button from the Analog 22 .2 5 Screen Control panel ï SetRX frequency to 880.05 MHz -1 16 .0 ï...

  • Page 47: Tx Power Out Test

    Power Step 225dBm - 29dBm Power Step 321.5dBm - 25.5dBm Power Step 417.5dBm - 21.5dBm Power Step 513.5dBm - 17.5dBm Power Step 69.5dBm - 13.5dBm Power Step 75.3dBm - 9.5dBm Note: When taking measurements, remem- ber to compensate for cable loss. Motorola Confidential Proprietary...
  • Page 48 Test Procedures CDMA T720 TX Frequency Error Test TX TEST Communications Analyzer TX Frequency FM Dev iation M Hz Setup 834.9900 11.58 • Select TX button from the Analog Screen Control panel A F Freq T X Power 27.60 1.00000 •...

  • Page 49: Tx Maximum Deviation

    - Set power level to power step 2, - Turn on Carrier - Select External TX audio path - Unmute TX Audio path - Turn on compandor View FM Deviation for reading. TX Maximum Deviation Pass Specifica- tions: 9.8 kHz - 12 kHz Motorola Confidential Proprietary...

  • Page 50: Tx Sat Deviation Test

    Test Procedures CDMA T720 TX SAT Deviation Test T X TEST Communications Analyzer T X Freq uency FM D ev iatio n M Hz Setup 1.890 834.9900 • Select TX button from the Analog Screen Control panel AF Freq TX Pow er 27.60...

  • Page 51: Tx St Deviation Test

    View FM Deviation for reading. The peak ST deviation measured on the communications analyzer should be 8 kHz ±800 Hz deviation. The demodulated signal on the communi- cations analyzer should have an audio fre- quency of kHz. Motorola Confidential Proprietary...

  • Page 52: Setup For Cdma Call

    Option 001 (duplexed voice mode). 4.Set the Data Type to echo. This will allow you to speak into the phone under test and hear the voice quality echoed in the phone via the CDMA link from the HP 8924C. Motorola ConÞdential Proprietary...

  • Page 53: Making A Cdma Phone Call

    Test Procedures CDMA T720 Making a CDMA Phone Call Press the front panel “CALL” key to CD MA CA LL C ONTROL initiate a CDMA call. E ND CALL CALL Answer the call on the CDMA Phone. Then speak into the phone and wait to hear your voice echoed back to you by the HP8924C.

  • Page 54: Setup For Cdma Rf Parametric Measurements

    03 (voice EVRC), 2.Return to the CDMA Call Control screen. along with service option 09 and service option 32768 for 14.4 vocoder type phones. 3.Change the Traffic Data Mode to Service Option 002. Motorola ConÞdential Proprietary...

  • Page 55: Making A Receiver Sensitivity Measurement

    Test Procedures CDMA T720 Making a Receiver Sensitivity Measurement To make an FER Measure- CDMA CELLULAR MOBILE RECEIVER TEST ment: T est Statu s Con nected FE R Service O pt 2/9 •Enter the Maximum number of Tes ting 0.00...

  • Page 56: Receiver Test Termination

    HP 8924C detects that the measured FER will fail the user entered FER specification with the specified confidence level, the test is halted and the Failed indicator is activated. This feature eliminates wasted time testing phones that are clearly failing the test. Motorola Confdential Proprietary...

  • Page 57: Cdma Transmitter Test

    CDMA T720 Test Procedures CDMA Transmitter Tests To make Concurrent RX and CDMA CELLULAR MOBILE TRANSMITTER TEST TX Measurements: Traffic Rh o Phs Error 0.980 •Restart FER with Confidence Limits Freq E rror Av g Pow er •Go to the TX Test Screen -97.1...

  • Page 58: Cdma Transmitter Power Range Test

    Note: If “always down” is selected, the phone will step its power down until the call is lost. If power control is changed, be sure to return it to “closed-loop” before proceeding onto the next test. Motorola Confdential Proprietary...

  • Page 59: Fer With Awgn Tests

    Test Procedures CDMA T720 FER with AWGN Tests To make a CDMA FER with CDMA CELLULAR MOBILE RECEIVER TEST AWGN measurement: T est Statu s Con nected FE R Service O pt 2/9 •Use the same setup as for the receiver Tes ting 0.00...

  • Page 60: Nam Programming Procedure

    E V R C NAM 2 Field and Contents AMPS: Home System ID (SID) Carrier def. Phone #s 02004 Option Byte 1 (Scan Home Side = 1 in 6th pos L to R) 10000100 Emergency Number 1 *911 © 2002 Motorola, Inc.

  • Page 61: Troubleshooting

    Logic / RF assembly is replaced. tive parts/assemblies. Defective circuit boards should be forwarded to the appropriate Motorola For general repairs which do not include service facility for repair. Refer to the “Replace- replacing the Logic/RF assembly, simply placing ment Parts”...

  • Page 62: No Turn On - Debug Procedure

    U2000 • Check the RTC clock Y2000: check the clock for 32.768 Khz signal if not present check C2009,C2010, C2011 and C2023, then replace Y2000 • Check the 19.2 Mhz clock signal at C2008 if © 2002 Motorola, Inc.

  • Page 63: Transmitter Troubleshooting

    Check for Tx IF (near the Tx IF Filter) Tx IF is 228.6MHz for 800 MHz CDMA & AMPS Tx IF is 263.6MHz for 1900 MHz CDMA Check for Tx RF at RF filter input and at PA input. © 2002 Motorola, Inc.
  • Page 64 1. Replace the antenna with a known good antenna. poor reception and/or damaged antenna erratic operation connector. (such as calls frequently dropping, b) Defective RF/ Audio- 2. Check for loose or damaged cans. weak and/or distorted Logic Board. audio, etc.) © 2002 Motorola, Inc.
  • Page 65 RF/Audio-Logic 2. Replace the RF/Audio-Logic Board board defective. 6. Receive audio is a) Speaker defective. 1. Replace defective speaker. weak and/or distorted. b) RF/Audio-Logic 2. Replace the RF/Audio-Logic Board board defective. © 2002 Motorola, Inc.
  • Page 66 T720 Product Support Tools This page is intentionally left blank. © 2002 Motorola, Inc.

  • Page 101: Harness

    DISP_CS...

  • Page 106: Audio Interface

    SPVSS GND1 GND2 GND3 GND4...

  • Page 111: Replacement Parts

    Number Description for Assmebly To insert Hinge into Flip Assembly To assemble Flip Assy with Base Front Housing To assemble Keypad Assy into Base Front Housing To assemble Personality PCB into Base Front Housing To assemble Cable Flex into Connector of Personality PCB To assemble Engine PCB on Personality PCB To assemble Base Rear Housing with Front Housing To screw into Basr Rear Housing...

  • Page 112: Mechanical Parts List

    HINGE T720 SLG4169A CDMA 1X ENG BRD 0109051A52 T720 CDMA AMER DB5100 0109051A53 T720 CDMA AMER DB5100 8488724M01 PCB BEAR FOR T720 ENG SLG4171A TX20 UI BOARD 4 0109051A54 TX20 UI BOD 4 NAV 0109051A55 TX20 UI BOD 4 NAV 8488723M01...

  • Page 113: Electrical Parts List

    Part Number : 0109051A52 Description : T720 CDMA AMER DB5100 TOP S Ref. Desc. Part # Description C1001 2113928N01 CAP CER CHIP 0.1UF 10% 6 C1002 2113743L41 CAP CHIP 10000 PF 10% X7 C1003 2113928N01 CAP CER CHIP 0.1UF 10% 6...
  • Page 114 Part Number : 0109051A52 Description : T720 CDMA AMER DB5100 TOP S Ref. Desc. Part # Description C141 2113743L17 CAP CHIP 1000 PF 10% X7R C142 2113743N18 CAP CHIP 4.7 PF +-.25PF C143 2113743L17 CAP CHIP 1000 PF 10% X7R...
  • Page 115 Part Number : 0109051A52 Description : T720 CDMA AMER DB5100 TOP S Ref. Desc. Part # Description C2021 2113928C04 CAP CER CHIP 4.7UF 6.3V1 C2022 '2113928E03' CAP CERAMIC CHIP 2.2 UF C2023 2113928P04 CHIP CAPACITOR (CERAMIC) C2024 2113928P04 CHIP CAPACITOR (CERAMIC)
  • Page 116 Part Number : 0109051A52 Description : T720 CDMA AMER DB5100 TOP S Ref. Desc. Part # Description C4004 2113947H01 CAP DL ARRAY 100,000PF 6 C4012 2113947B05 CAP DL ARRAY 33.0PF 50V C4013 2113947H01 CAP DL ARRAY 100,000PF 6 C4014 2113947H01...
  • Page 117 Part Number : 0109051A52 Description : T720 CDMA AMER DB5100 TOP S Ref. Desc. Part # Description L131 2409154M22 IND CER MLTILYR 56.0NH 1 L140 2409154M23 IND CER MLTILYR 68.0NH 1 L141 2409154M23 IND CER MLTILYR 68.0NH 1 L142 2485793G19...
  • Page 118 Part Number : 0109051A52 Description : T720 CDMA AMER DB5100 TOP S Ref. Desc. Part # Description R203 0662057V61 RES CHIP 12.1 K 1% 0402 R204 0609591M37 RES CHIP DUAL 10K 5% 0.6 R205 0662057M95 RES. CHIP 7500 5% 20X40...
  • Page 119 Part Number : 0109051A52 Description : T720 CDMA AMER DB5100 TOP S Ref. Desc. Part # Description U3100 5109817F58 IC CURRENT LIM SW SOT23- U3120 5187970L15 IC USB TRANS FULL-SPEED U350 4809718L15 OSC MOD TCXO 19.2MHZ 5X3 U4001 5109731C24 IC OP AMP SNGL LMV321 5S...
  • Page 120 Part Number 0109051A54 Description TX20 UI BOD 4 NAV KE Y TOP SIDE Ref. Desc. Part # Description C7002 2113947B05 CAP DL ARRAY 33.0 C7003 2113947B05 CAP DL ARRAY 33.0 C7004 2113947B05 CAP DL ARRAY 33.0 C7006 2113947B05 CAP DL ARRAY 33.0 C7007 2113947B05 CAP DL ARRAY 33.0...
  • Page 121 Part Number : 0109051A53 Description : T720 CDMA AMER DB5100 BOT Ref Desc. Part # Description 3987575M01 CONT ANT MAIN C101 2113743N09 CAP CHIP 2.0 PF +-.25P C102 2113743N14 CAP CHIP 3.3 PF +-.25P 2113743N12 CAP CHIP 2.7 PF +-.25P...
  • Page 122 Part Number : 0109051A53 Description : T720 CDMA AMER DB5100 BOT Ref Desc. Part # Description R4007 0662057M86 RES. CHIP 3300 5% 20X R4016 0662057N09 RES. CHIP 27K 5% 20X R4017 0662057N27 RES. CHIP 150K 5% 20X 2687586M01 SHIELD PA PCS...
  • Page 123 Part Number : 0109051A55 Description : TX20 UI BOD 4 NAV KEY BOT SIDE Ref. Desc. Part # Description VR7001 4813832C70 TRAN SUP QUAD 5.6V SC59 VR7002 4813832C70 TRAN SUP QUAD 5.6V SC59 VR7003 4813832C70 TRAN SUP QUAD 5.6V SC59 J7002 0987817K04 30PIN RECPT MATING CNTCR 1.5MM...

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