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GSM SERVICE MANUAL

GSM SERVICE MANUAL. VK2020. ☞ Service Guidelines. Ÿ   Precise adjustment should be made in a shield box or shield room where spurious noise has been eliminated. Ÿ  When using magnetized tools, note that related magnetic elements may cause malfunctioning of critical parts(such as IC).

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GSM SERVICE MANUAL

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  1. GSM SERVICE MANUAL VK2020 VK Quality Group GSM C/S

  2. ☞ Service Guidelines Ÿ  Precise adjustment should be made in a shield box or shield room where spurious noise has been eliminated. Ÿ  When using magnetized tools, note that related magnetic elements may cause malfunctioning of critical parts(such as IC). Use a twisted pair wire of thick type when measuring level. Using such a thick twisted pair wire could reduce the measurement error as the wire contains less RF resistance. Ÿ  When disassembling the phone set, you must use a driver tool meeting standard requirements. Ÿ  When making repairs with power on after connecting the test package, note that dangers such as overcurrent, parts deterioration caused by short-circuit may occur. Ÿ  Note that PCB land may be detached due to overheating of a soldering iron while making repairs on board status. Ÿ  Any additional devices that cause the change of performance shall not be added to this phone, as registered. VK Quality Group GSM C/S

  3. ☞ Table of Contents Chapter 1. Overview & FeaturesChapter 2. Appearance & ConfigurationChapter 3. Assembling & Disassembling MethodsChapter 4. Block DiagramChapter 5. SchematicChapter 6. PCB DiagramChapter 7. Trouble Shooting Appendix. Electrical Part List VK Quality Group GSM C/S

  4. CHAPTER 1. OVERVIEW & FEATURES • Overview • Features • Standard VK Quality Group GSM C/S

  5. ☞ Overview VK 2020 Mobile Phone is a Slim Bar type Mobile phone with color LCD,MP3,operated in the GSM and Digital Cellular Mobile Radio System, which is the Pan-European mobile cellular standard. VK 2020Mobile Phone has the operation band of GSM 900 and DCS 1800. GSM PhaseII features are fully supported and parts of the GSM Phase II+ features are also supported. About the SIM Toolkit, VK 2020 Mobile Phone supports up to Class 3 including Class 1, 2. For speech communication, VK 2020 Mobile Phone supports Full Rate(FR), Enhanced Full Rate(EFR) and Half Rate(HR). For easy text, eZi Text is implemented and WAP protocol is adopted for internet connection. VK 2020 Mobile Phone supports GPRS up to Class 10. VK Quality Group GSM C/S

  6. ☞ Features (HW) VK Quality Group GSM C/S

  7. ☞ Features (HW) VK Quality Group GSM C/S

  8. ☞ Features (SW) VK Quality Group GSM C/S

  9. ☞ Features (SW) VK Quality Group GSM C/S

  10. ☞ Standard VK Quality Group GSM C/S

  11. CHAPTER 2. APPEARANCE & CONFIGURATION • Appearance • Icons • LCD Panel VK Quality Group GSM C/S

  12. ☞ Appearance VK Quality Group GSM C/S

  13. ☞ Icons VK Quality Group GSM C/S

  14. ☞ Icons VK Quality Group GSM C/S

  15. ☞ LCD Panel VK Quality Group GSM C/S

  16. CHAPTER 3. ASSEMBLING & DISASSEMBLING • Assembly Drawings • Disassembling Methods VK Quality Group GSM C/S

  17. 1. Assembly Drawings • Exploded View & Parts List VK Quality Group GSM C/S

  18. ☞ Exploded View & Parts List VK Quality Group GSM C/S

  19. 2. Disassembling Methods • Tools • Rear Case Disassembling • Main PCB Disassembling • 4) LCD Module Disassembling VK Quality Group GSM C/S

  20. ☞ Tool Preparation Disassembling tools are as below : Star-shaped(*) Screw Driver Hinge Remover Tweezers Cross-tip(+) Screw Driver 1. 2. 3. 4. In disassembling the VK Mobile Phone set, - you must use tools meeting standard specifications. - do not exert excessive force; Otherwise, the phone set may be damaged. VK Quality Group GSM C/S

  21. Rear Case Disassembling VK Quality Group GSM C/S

  22. ☞ Rear Case Unscrew four screws on the back of the phone. Turn the screws anticlockwise using cross-shaped screwdriver . Widen a space to make a gap VK Quality Group GSM C/S

  23. Main PCB Disassembling VK Quality Group GSM C/S

  24. ☞ Main PCB 1 2 3 1.Take off Intenna 2.Separate FPCB from connector 3.Take off Main PBA Slightly. VK Quality Group GSM C/S

  25. LCD Module Disassembling VK Quality Group GSM C/S

  26. ☞ LCD Module 1 3 Unhook LCD PCB 2 Open the LCD connector, then slightly pull out LCD From Connector. VK Quality Group GSM C/S

  27. CHAPTER 4. BLOCK DIAGRAM • RF Block Diagram • BASEBAND Block Diagram VK Quality Group GSM C/S

  28. ☞ RF Block Diagram VK Quality Group GSM C/S

  29. ☞ BASEBAND Block Diagram VK Quality Group GSM C/S

  30. CHAPTER 5. SCHEMATIC • Overall • Base Band Block • MCP Main Block • Nand Block • Peripheral & Key Block • Power Management Block • RF Block • Audio & Video Block • Bluetooth Block • Hole Block VK Quality Group GSM C/S

  31. ☞ Overall Structure VK Quality Group GSM C/S

  32. ☞ Base Band Block VK Quality Group GSM C/S

  33. ☞ MCP Main VK Quality Group GSM C/S

  34. ☞ Nand Block VK Quality Group GSM C/S

  35. ☞ Peripheral & key Block VK Quality Group GSM C/S

  36. ☞ Power Management Black VK Quality Group GSM C/S

  37. ☞ RF Block VK Quality Group GSM C/S

  38. ☞ Audio & Video Block VK Quality Group GSM C/S

  39. ☞ Bluetooth Block VK Quality Group GSM C/S

  40. ☞ Hole Block VK Quality Group GSM C/S

  41. CHAPTER 6. PCB DIAGRAM • Main PCB • Module Area • RF Area • Baseband Area VK Quality Group GSM C/S

  42. ☞ Main PCB Top Bottom VK Quality Group GSM C/S

  43. ☞ Module Area VK Quality Group GSM C/S

  44. ☞ RF Area VK Quality Group GSM C/S

  45. ☞ BASEBAND Area VK Quality Group GSM C/S

  46. Power-On Trouble • Melody Trouble • LCD Trouble • Charging Trouble • Vibrator Trouble • Backlight Trouble • SIM Detection Trouble • 11.RX Sensitivity Trouble(E-GSM) CHAPTER 7. TROUBLE SHOOTING • Power-On Trouble • Melody Trouble • LCD Display Trouble • Charging Trouble • Vibrator Trouble • Backlight Trouble • SIM Detection Trouble • Ear-Phone Trouble • Key Detection Trouble • TX Power Trouble (E-GSM) VK Quality Group GSM C/S

  47. START The level of battery Charge the battery / Voltage is higher NO Check the battery . Than 3 . 4 V YES When press power button then V _ CORE Check PMIC NO or other power alright ? YES CLK 13 M , CLK 32 K is Check V 250 G NO alright ? YES Check SPK or When boot phone can YES you hear melody Melody IC NO Replace Main board END ☞ Power-On Trouble VK Quality Group GSM C/S

  48. ☞ Melody Trouble VK Quality Group GSM C/S

  49. ☞ LCD Trouble VK Quality Group GSM C/S

  50. ☞ Charging Trouble VK Quality Group GSM C/S

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