Huawei U8350 Maintenance Manual
  1. Manuals
  2. Brands
  3. Huawei Manuals
  4. Cell Phone
  5. U8350
  6. Maintenance manual
Huawei U8350 Maintenance Manual

Huawei U8350 Maintenance Manual

Hide thumbs Also See for U8350:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Instruction Manual, User Manual
U8350 Maintenance Manual Basic Version
Prepared by
Reviewed by
Approved by
V1.0
Product Department
Documentation Team
Huawei Technologies Co., Ltd.
All rights reserved
Date
2011-05-18
Date
Date

Advertisement

Table of Contents
loading

Related Manuals for Huawei U8350

Summary of Contents for Huawei U8350

  • Page 1 U8350 Maintenance Manual Basic Version V1.0 Product Department Prepared by Date 2011-05-18 Documentation Team Reviewed by Date Approved by Date Huawei Technologies Co., Ltd. All rights reserved...
  • Page 2 U8350 Maintenance Manual Basic Version V1.0 Internal Revision record Revision Section Change Date Revision Cause Author Version Number Description Product Department 2011-05-18 V1.0 Documentation Team 2011-05-18 Huawei confidential. No spreading without permission. Page 2 of 68...

  • Page 3: Table Of Contents

    U8350 Maintenance Manual Basic Version V1.0 Internal Contents 1 PRODUCT INTRODUCTION ..........................5 1.1 P ............................. 5 RODUCT PPEARANCE 1.2 P ..........................5 RODUCT PECIFICATIONS 2 MAINTENANCE INFORMATION GUIDE ......................7 2.1 D ........................... 7 OCUMENT PPLICATION 2.2 M ........................... 7...
  • Page 4 U8350 Maintenance Manual Basic Version V1.0 Internal 9.16.5 RF Transmitting Failure-WCDMA 900MHz ..................... 62 9.16.6 RF Transmitting Failure-GSM ........................63 10 WELD POINTS INDICATOR CHART FOR PCB AND BGA CHIP ............64 11 FUNCTIONAL TEST ............................66 11.1 K EYPAD NTRODUCTION ..........................

  • Page 5: Product Introduction

    U8350 Maintenance Manual Basic Version V1.0 Internal Product Introduction 1.1 Product Appearance 1.2 Product Specifications Items Content Description Shape Bar-type 2.6-inch TFT-LCD capacitive touch screen with 320X240 (QVGA) resolution,262k colors Accelerometer Sensors Digital compass Dimensions 115mm(L)×62.8mm(W)×9.9mm(H) Weight About 122g(including the battery)
  • Page 6 U8350 Maintenance Manual Basic Version V1.0 Internal Items Content Description GSM 1800 MHz: 1710-1785 MHz (UL), 1805-1880 MHz (DL) GSM 1900 MHz: 1850-1910 MHz (UL), 1930-1990 MHz (DL) Network Access 3G-WCDMA /HSDPA /GPRS /EDGE SIM/USIM card interface standard 6-pin SIM card interface, supporting the 1.8/3V USIM card External Interface Standard Micro USB, MicroSD Card slot, 3.5mm headset...

  • Page 7: Maintenance Information Guide

    Maintenance Information Guide 2.1 Document Application This document provides instructions for maintenance of Huawei products. This manual is Huawei proprietary and is only permitted to be used by authorized service partners. Shall there be any mistakes found in this document, kindly contact our customer service personnel.

  • Page 8: Explosive View Of Product

    U8350 Maintenance Manual Basic Version V1.0 Internal Explosive View of Product This exploded view is only applied to show phone frame. It is not regarded as a reference for applying spare parts. Description Quantity Front_Cover_Asm,U8350 Bottom Cover Asm,U8350 BATT_Cover_Asm,U8350 Front_deco_asm,U8350...
  • Page 9 U8350 Maintenance Manual Basic Version V1.0 Internal Description Quantity VOLUM_KEY_DOME,U8350 POWER_KEY_DOME,U8350 MAIN_KEY_DOME,U8350 SHIELD_FRAME_1,U8350 SHIELD_COVER_1,U8350 PCB_support,U8350 SIM_support,U8350 SPK_CU,U8350 batt_adhen,U8350 TP PROTECT FILM Product_Nameplate TP_IC_gasket TP_Gasket,U8350 T5 pan head mechanical screw,M1.4*3.5*D2.6*0.8,Plated with black zinc Mechanical Screw Staping screw ST1.4*3.5*D2.6*0.8 Disassemble(Î ¦ 2.5mm)-proof label Waterproof Label-D3.0mm...

  • Page 10: Location Of Components On The Main Board

    U8350 Maintenance Manual Basic Version V1.0 Internal Location of Components on the Main Board J1101 IO Connector Z1101 Varistor, Failure symptom: ESD+EMI Noise Filter Charging failure. Data Failure symptom: communication failure. Earphone failure. J1102 Earphone U1101 Earphone Connector Audio Power...
  • Page 11 U8350 Maintenance Manual Basic Version V1.0 Internal U3101 Temperature Compensated Crystal X301 Oscillator-19.2MHz Crystal-0.032768MHz Failure symptom: Failure symptom: Can’t power on. Can’t power on. U3301 SAW Filter- U3402 SAW Filter 1950MHz 897.5MHz Failure symptom: Failure symptom: W2100 can’t register W900 can’t register the the network.
  • Page 12 U8350 Maintenance Manual Basic Version V1.0 Internal U1501 DCDC Control J1201 BTB Chip Connector, Failure symptom: Female,50Pin Charging failure. Failure symptom: LCD display failure. J1302 BTB U1201 Voltage Connector-Female- Regulator, Current 24Pin Mode Failure symptom: U4601 Single chip WiFi, Failure symptom: Touch Panel failure;...
  • Page 13 U8350 Maintenance Manual Basic Version V1.0 Internal Failure symptom: Keypad failure; voice transmitting failure. U201 Interface Controller Failure symptom: Keypad failure. MIC201 MIC Failure symptom: voice transmitting failure. DOME Failure symptom: Keypad failure. 2011-05-18 Huawei confidential. No spreading without permission.
  • Page 14 U8350 Maintenance Manual Basic Version V1.0 Internal BOM List is only for your reference, the lasted BOM information is downloaded in the system of Huawei. Description Location 15010251 Schottky Diode-30V-0.2A-0.5V-SOD523 D1301,D901 Transient Suppressing D1101,D1102, 15040238 Diodes-6V-14V-10W-12A-SOD882/0402 D1501, D902,D903 Transient Suppressing...
  • Page 15 U8350 Maintenance Manual Basic Version V1.0 Internal Description Location MCP,4Gb(256Mx16)NAND 40060281 Flash,64K,1.8V,FBGA137(pb-free),2Gb(64Mx32)Mobile U601 DDR SDRAM Oscillating 32050031 Motor,SMT,2.7,75A,14000rpm,11mm*4.4mm*3.6mm,Null U901 ,28ohm Headphone Audio Power Amplifier,2.3 V to 5.5 39080124 U1101 V,differential AB Amplifier,QFN Voltage Regulator,Current Mode,Regulated Output 39110581 U1201 Current With 0.3% Matching,0.125A,16Pin QFN...
  • Page 16 U8350 Maintenance Manual Basic Version V1.0 Internal Description Location 12020132 Crystal-26MHz-12pF-+/-10ppm-50ohm-SMD3225 X4601 Varistor-8V-4V-30V-SMT-0405-ESD+EMI Noise 07040064 Z1101 Filter-DCR 0.3ohm/270pF@1MHz 07040072 ESD_EMI Filter-14V-30pF-800~3000MHz-ARRAY-0603 Z1601 13010148 SAW Filter-2140MHz-50V-00231804 Z4304 03021ANH Keypad Board,U8350 Lighting 15020143 Diode-1cd/1.6cd-White-30mA-3.8mm*1.2mm*0.6mm/Sid D202,D203 e View 22050053 MIC--44dB.-D4.0mm*1.3 mm-SMT MIC201 Interface Controller,18-GPIO port expander or 8 *10...

  • Page 17: Software Upgrade

    U8350 Maintenance Manual Basic Version V1.0 Internal Software Upgrade 5.1 Preparation for Upgrade Item Contents Remark Battery The battery level shall be no less than two bars. Micro SD card 512M at least. Upgrade Environment For copy upgrade file. The version is only for your information. Please Main package download the latest version.
  • Page 18 U8350 Maintenance Manual Basic Version V1.0 Internal 4. Begin upgrade the main package, the handset will restart automatically. 5. Upgrade the vender package. The upgrade procedure is the same as upgrade main package. 2011-05-18 Huawei confidential. No spreading without permission.

  • Page 19: Force Download

    U8350 Maintenance Manual Basic Version V1.0 Internal 5.3 Force Download 1. Format micro SD card or delete its content. 2. Create a folder and named as “dload”, copy “updata.app” into it. 3. Make sure your handset is power off, Insert micro SD card into the handset.

  • Page 20: Check The Firmware Version

    U8350 Maintenance Manual Basic Version V1.0 Internal 5.4 Check the Firmware Version To check the version Settings -> About phone -> Build number 5.5 Error Handling Error 1 During SD card upgrade, the key pad led flash very frequently (two flashes per second), and the progress bar stop, that means an error occurs.

  • Page 21: Maintenance Tools

    U8350 Maintenance Manual Basic Version V1.0 Internal Maintenance Tools Name: Constant-temperature Hot Air Gun Purpose: Heat component. Name: Soldering Iron Purpose : Repair soldering Name: DC Power Supply Purpose: Supply voltage and current. Name: Soldering Station Purpose: Fix main board.
  • Page 22 U8350 Maintenance Manual Basic Version V1.0 Internal Name: Tool kit Purpose : Assemble and Disassemble tool Name: Electronic Screw Driver Purpose : Assemble and Disassemble tool 2011-05-18 Huawei confidential. No spreading without permission. Page 22 of 68...

  • Page 23: Disassembly Procedure

    U8350 Maintenance Manual Basic Version V1.0 Internal Disassembly Procedure 1. Make sure the ESD antistatic wrist strap 2. Disassemble U8350 procedure is shown below. connect to the ground is normal. 3. Remove the Battery Cover. 4. Remove the Battery. 5. Remove the seven screws.
  • Page 24 U8350 Maintenance Manual Basic Version V1.0 Internal 7. Remove the Bottom Cover. 8. Disconnect the FPCs. 9. Remove the three Screws. 10. Remove the Main board. 11. Loosen the Touch Panel FPC connector. 12.Remove the LCD Frame. 2011-05-18 Huawei confidential. No spreading without permission.
  • Page 25 U8350 Maintenance Manual Basic Version V1.0 Internal 13. Protect the Touch panel with film. 14. Protect the LCD lens with film. 15. Take out the LCD. 16. Remove the keyboard. 17. Remove the Speaker. 18. Remove the screw. 2011-05-18 Huawei confidential. No spreading without permission.
  • Page 26 U8350 Maintenance Manual Basic Version V1.0 Internal 19. Take out the Antenna. 20. Remove the Fun_key. 21. Remove the Front_deco_asm. 22. Remove the Num_key. 23. Remove the Receiver. 24. Remove the Sidekey FPC. 2011-05-18 Huawei confidential. No spreading without permission.
  • Page 27 U8350 Maintenance Manual Basic Version V1.0 Internal 25. The disassembly procedure is completed. 2011-05-18 Huawei confidential. No spreading without permission. Page 27 of 68...

  • Page 28: Assembly Procedure

    U8350 Maintenance Manual Basic Version V1.0 Internal Assembly Procedure 2. Assemble U8350 procedure is shown below. 1. Make sure the ESD antistatic wrist strap connect to the ground is normal. 3. Assemble the Sidekey FPC. 4. Assemble the Receiver. 5. Assemble the Num_key.
  • Page 29 U8350 Maintenance Manual Basic Version V1.0 Internal 7. Assemble the Antenna. 8. Install the screw. 9. Install the Speaker. 10. Assemble the keyboard. 11. Place the LCD into LCD Frame. 12. Remove the protect film on the LCD. 2011-05-18 Huawei confidential. No spreading without permission.
  • Page 30 U8350 Maintenance Manual Basic Version V1.0 Internal 13. Connect the Touch panel FPC to the BTB 14. Place the Main board on the LCD Frame. connector on the Sidekey FPC. 15. Tighten the three screws. 16. Connect the FPCs to Main board.
  • Page 31 U8350 Maintenance Manual Basic Version V1.0 Internal 19. Assemble the Bottom cover. 20. Press the Front Cover and Bottom Cover. 21. Tighten the six screws. 22. Assemble the battery. 23. Assemble the battery cover. 24.The assembly procedure is completed. 2011-05-18 Huawei confidential.

  • Page 32: Trouble Shootings Of Common Faults

    The main chip of system is MSM7225. Include three function modules, baseband interface management module MSM7225, power management module PM7540, RF IC RTR6285 According to functions, U8350 can be divided into the baseband processing module (including CPU-U401 and Flash-U601), power module (U201), RF transmitting module (U3801) and peripheral circuit.

  • Page 33: No Power On

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.2 No Power On 9.2.1 High Current (DC power supply) Analyzing： High current is caused by the short of power supply circuit, when use the DC power supply, the current is about 500mA or more. This fault consist of major reasons, the VBAT is short with ground.
  • Page 34 U8350 Maintenance Manual Basic Version V1.0 Internal VBAT U3501 3.7-4.2V U401 Test C3501 U201 VBAT U3302 3.7-4.2V Test C3302 VBAT U3401 3.7-4.2V Test C3401 U3501 U3302 U3401 Figure 9-1 VBAT U4601 3.7-4.2V Test C4610 U4601 VBAT J1501 3.7-4.2V Test J1501 Pin3...

  • Page 35: Low Current (Dc Power Supply)

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.2.2 Low Current (DC power supply) Reference Figure 9-3 Low current Download the latest firmware software Version, then test if it is normal? Measure whether Replace the The output frequency value U3101 of U3101 Pin3 is 19.2MHz?
  • Page 36 U8350 Maintenance Manual Basic Version V1.0 Internal U201 output Default value Test point VREG_SYNT 2.85V C228 VREG_TCXO 2.85V C227 VREG_GP1 2.6V C229 VREG_GP2 1.8V C251 VREG_GP5 2.85V C205 VREG_GP6 2.85V C237 C226 VREG_RFTX 2.7V C229 VREG_GP1 2.6V U601 C223 VREG_RFRX1 2.1V...

  • Page 37: Charge Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.3 Charge Failure Analyzing：The IO Connector damaged causes the failure usually. Reference Figure 9-4 Charge failure Measure whether the voltage Replace the of J1101 Pin1 is about 5V? J1101 Measure whether the F1101...

  • Page 38: Keyboard Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.4 Keyboard Failure Reference Figure 9-5 Keypad failure Check whether the DOME is Replace the DOME Check whether the keypad Replace the FPC and BTB connector keypad FPC or （J1303） are OK? J1303...

  • Page 39: Vibration Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.5 Vibration Failure Reference Figure 9-6 Vibration failure Supply voltage (3V) Replace the for Motor, and then check Motor whether it is vibrate? Measure whether Replace the the D901 is normal? D901 Replace the U201...

  • Page 40: Sim Card Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.6 SIM Card Failure Reference Figure 9-7 SIM card failure Check whether Re-solder or SIM socket J1601 is replace J1601 normal？ Replace Z1601, then check if the phone is OK? Insert a normal SIM card, test if VREG_RUIM is 1.8V or...

  • Page 41: Sd Card Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.7 SD Card Failure SD card failure Check whether J1602 is Replace the normal? J1602 Insert a normal SD card, Replace the measure whether the voltage U201 VREG_WLAN is 3.0V? Replace the U401 2011-05-18 Huawei confidential.

  • Page 42: Display Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.8 Display Failure Reference Figure 9-8 Display failure Check whether Re-solder and BTB connector J1201 is replace J1201 normal? Measure whether Replace the power supply for LCD is U201 normal? Replace the LCD,...

  • Page 43: Touch Panel Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.9 Touch Panel Failure Reference Figure 9-9 Touch Panel failure Update the touch Panel firmware, then check whether the phone is OK? Check whether the Handset Replace Handset Sidekey FPC is normal? Sidekey FPC.

  • Page 44: Camera Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.10 Camera Failure Reference Figure 9-10 Camera failure Measure whether Replace the the voltage of VREG_GP1/2/ U201 6 are normal? Replace camera module, then check whether it is OK? Check whether J1001 is...

  • Page 45: Audio Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.11 Audio Failure 9.11.1 No Ring Tone Reference Figure 9-11 No ring tone Check if the sound setting is Setting the normal? phone Measure whether Replace the the impedance value of speaker speaker is about 8Ω?

  • Page 46: Voice Transmitting Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.11.2 Voice Transmitting Failure Reference Figure 9-12 Voice transmitting failure Replace the MIC, then inspect if the phone is OK? Check if the keyboard FPC Replace the is normal? Keyboard FPC Check whether...

  • Page 47: Receiver Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.11.3 Receiver Failure Receiver failure Measure whether Replace the the impedance ofreceiver is receiver about 32Ω？ Replace the U401 2011-05-18 Huawei confidential. No spreading without permission. Page 47 of 68...

  • Page 48: Earphone No Voice

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.11.4 Earphone No Voice Reference Figure 9-13 Earphone no voice Check R1102/ Measure the voltage of R1103/ C1103, J1102 Pin3 is normal? and replace the fault componet. Check if J1102 is normal? Replace J1102...

  • Page 49: Earphone Can't Transmit Voice

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.11.5 Earphone Can’t Transmit Voice Reference Figure 9-14 Earphone no voice Check R1102/ Measure the voltage of R1103/ C1103, J1102 Pin3 is normal? and replace the fault componet. Check if J1102 is normal?

  • Page 50: Fm Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.12 FM Failure Reference Figure 9-15 FM Failure Check if J1102 is normal? Replace J1102 Replace the U1701 J1102 U1701 Figure 9-15 2011-05-18 Huawei confidential. No spreading without permission. Page 50 of 68...

  • Page 51: Wifi Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.13 WIFI Failure Reference Figure 9-16 WIFI Failure Check whether Replace the the antenna and antenna antenna/ spring are normal? antenna spring Measure whether the output Replace X4601 of X4601 Pin3 is 26MHz?
  • Page 52 U8350 Maintenance Manual Basic Version V1.0 Internal U4601 U4705 X4601 U4704 Antenna Spring Figure 9-16 2011-05-18 Huawei confidential. No spreading without permission. Page 52 of 68...

  • Page 53: Bt Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.14 BT Failure Reference Figure 9-17 BT Failure Check whether Replace the the antenna and antenna pad antenna/ are normal? antenna pad Measure whether the output Replace X4601 of X4001is 32MHz? Replace U4705,...
  • Page 54 U8350 Maintenance Manual Basic Version V1.0 Internal U4705 U4704 U4001 X4001 Antenna Spring Figure 9-17 2011-05-18 Huawei confidential. No spreading without permission. Page 54 of 68...

  • Page 55: Gps Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.15 GPS Failure Reference Figure 9-18 GPS Failure Check whether Replace the the antenna and antenna pad antenna/ are normal? antenna pad Replace U1402, check whether the function is normal? Replace U1403, check whether the function is...
  • Page 56 U8350 Maintenance Manual Basic Version V1.0 Internal U1402 U1403 Figure 9-18 2011-05-18 Huawei confidential. No spreading without permission. Page 56 of 68...

  • Page 57: Rf Failure

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.16 RF Failure Power Supply for RF： VREG_RFRX1 2.1V VREG_RFTX 2.7V VREG_MSMP 2.6V VREG_TCXO 2.85V C3924 VREG_RFRX1 2.1V U401 C3913 VREG_RFTX 2.7V U3301 C3927 VREG_MSMP 2.6V U3501 U3302 U3402 C3207 VREG_TCXO 2.85V U3801...

  • Page 58: Rf Receiving Failure-Wcdma 2100Mhz

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.16.1 RF Receiving Failure-WCDMA 2100MHz Reference Figure 9-19 W2100 receiving failure Upgrade the software， measure whether it is normal? Measure whether Replace the the RF power supply voltage U201 is normal? Measure whether two pins of...

  • Page 59: Rf Receiving Failure-Wcdma 900Mhz

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.16.2 RF Receiving Failure-WCDMA 900MHz Reference Figure 9-19 W900 receiving failure Upgrade the software， measure whether it is normal? Measure whether Replace the the RF power supply voltage U201 is normal? Measure whether two pins of...

  • Page 60: Rf Receiving Failure-Gsm

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.16.3 RF Receiving Failure-GSM Reference Figure 9-19 GSM receiving failure Upgrade the software， measure whether it is normal? Measure whether Replace the the RF power supply voltage U201 is normal? Measure whether two pins of...

  • Page 61: Rf Transmitting Failure-Wcdma 2100Mhz

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.16.4 RF Transmitting Failure-WCDMA 2100MHz Reference Figure 9-19 W2100 Transmitting failure Upgrade the software， measure whether it is normal? Measure whether Replace the the RF power supply voltage U201 is normal? Measure whether two pins of...

  • Page 62: Rf Transmitting Failure-Wcdma 900Mhz

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.16.5 RF Transmitting Failure-WCDMA 900MHz Reference Figure 9-19 W900 Transmitting failure Upgrade the software， measure whether it is normal? Measure whether Replace the the RF power supply voltage U201 is normal? Measure whether two pins of Replace the the U3201 are connection？...

  • Page 63: Rf Transmitting Failure-Gsm

    U8350 Maintenance Manual Basic Version V1.0 Internal 9.16.6 RF Transmitting Failure-GSM Reference Figure 9-19 GSM Transmitting failure Upgrade the software， measure whether it is normal? Measure whether Replace the the RF power supply voltage U201 is normal? Measure whether two pins of Replace the the U3201 are connection？...

  • Page 64: Weld Points Indicator Chart For Pcb And Bga Chip

    U8350 Maintenance Manual Basic Version V1.0 Internal Weld Points Indicator Chart for PCB and BGA Chip (White) ：GND ：Empty point 2011-05-18 Huawei confidential. No spreading without permission. Page 64 of 68...
  • Page 65 U8350 Maintenance Manual Basic Version V1.0 Internal (White) ：GND ：Empty point 2011-05-18 Huawei confidential. No spreading without permission. Page 65 of 68...

  • Page 66: Functional Test

    U8350 Maintenance Manual Basic Version V1.0 Internal Functional Test 11.1 Keypad Introduction Power key Volume up key Volume down key Up key Left key End key Search key Send key Back key Home key Right key Menu key Down key OK key 11.2 MMI Test...
  • Page 67 U8350 Maintenance Manual Basic Version V1.0 Internal Item Test method and information Touch screen Touch black dot around screen, it will display red dot, means PASS. Press test Send key to enter the next test. The LCD will display white screen. Press Send key to enter the next test.

  • Page 68: Voice Call Test

    U8350 Maintenance Manual Basic Version V1.0 Internal 11.3 Voice Call Test 1. Insert USIM card to mobile phone, press and hold Power key to power on. 2. Check whether the signal strength is changed normally in normal network environment. 3. Dial a fixed-line number to test the voice quality during a call.

Table of Contents