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

2. VK Quality Group GSM C/S 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. Service Guidelines Service Guidelines

3. VK Quality Group GSM C/S Table of Contents Table of Contents Chapter 1. Overview & Features Chapter 2. Appearance & Configuration Chapter 3. Assembling & Disassembling Methods Chapter 4. Block Diagram Chapter 5. Schematic Chapter 6. PCB Diagram Chapter 7. Trouble Shooting Appendix. Electrical Part List

4. VK Quality Group GSM C/S CHAPTER 1. OVERVIEW & FEATURES 1.Overview 2.Features 3.Standard

5. VK Quality Group GSM C/S Overview 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 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 2020 Mobile 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.

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

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

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

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

10. VK Quality Group GSM C/S Standard Standard

11. VK Quality Group GSM C/S CHAPTER 2. APPEARANCE & CONFIGURATION 1.Appearance 2.Icons 3.LCD Panel

12. VK Quality Group GSM C/S Appearance Appearance

13. VK Quality Group GSM C/S Icons Icons

14. VK Quality Group GSM C/S Icons Icons

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

16. VK Quality Group GSM C/S 1.Assembly Drawings 2.Disassembling Methods CHAPTER 3. ASSEMBLING & DISASSEMBLING

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

18. VK Quality Group GSM C/S Exploded View & Parts List Exploded View & Parts List NO.DESCRIPTIONQTY 1Window LCD1 2CASE FRONT1 3KEYPAD ASSY1 4DOME SHEET1 5KEY PBA1 6C-MIC1 7 COVER EARJACK1 8 CASE REAR1 9 INNERPACK ASSY1 10Cover BATTERY1 11 BLACK LCD1 12LCD MODULE1 13M1.4 SCREW6

19. VK Quality Group GSM C/S 2. Disassembling Methods 1)Tools 2)Rear Case Disassembling 3)Main PCB Disassembling 4) LCD Module Disassembling

20. VK Quality Group GSM C/S Tool Preparation Tool Preparation 1. Star-shaped(*) Screw Driver 2. Hinge Remover 3. Tweezers 4. Cross-tip(+) Screw Driver Disassembling tools are as below : 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. 1.1.2.2.3.3.4.4.

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

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

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

24. VK Quality Group GSM C/S Main PCB Main PCB 1.Take off Intenna 2.Separate FPCB from connector 3.Take off Main PBA Slightly. 12 3

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

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

27. VK Quality Group GSM C/S 1.RF Block Diagram 2.BASEBAND Block Diagram CHAPTER 4. BLOCK DIAGRAM

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

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

30. VK Quality Group GSM C/S 1.Overall 2.Base Band Block 3.MCP Main Block 4.Nand Block 5.Peripheral & Key Block 6.Power Management Block 7.RF Block 8.Audio & Video Block 9.Bluetooth Block 10.Hole Block CHAPTER 5. SCHEMATIC

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

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

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

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

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

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

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

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

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

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

41. VK Quality Group GSM C/S 1.Main PCB 2.Module Area 3.RF Area 4.Baseband Area CHAPTER 6. PCB DIAGRAM

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

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

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

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

46. VK Quality Group GSM C/S 1.Power-On Trouble 2.Melody Trouble 3.LCD Trouble 4.Charging Trouble 5.Vibrator Trouble 6.Backlight Trouble 7.SIM Detection Trouble 11.RX Sensitivity Trouble(E-GSM) CHAPTER 7. TROUBLE SHOOTING 1.Power-On Trouble 2.Melody Trouble 3.LCD Display Trouble 4.Charging Trouble 5.Vibrator Trouble 6.Backlight Trouble 7.SIM Detection Trouble 8.Ear-Phone Trouble 9.Key Detection Trouble 10.TX Power Trouble (E-GSM)

47. VK Quality Group GSM C/S Power-On Trouble Power-On Trouble

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

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

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

51. VK Quality Group GSM C/S Vibrator Trouble Vibrator Trouble

52. VK Quality Group GSM C/S Backlight Trouble Backlight Trouble

53. VK Quality Group GSM C/S SIM Detection Trouble SIM Detection Trouble

54. VK Quality Group GSM C/S Ear-Phone Trouble Ear-Phone Trouble

55. VK Quality Group GSM C/S KEY Detection Trouble KEY Detection Trouble

56. VK Quality Group GSM C/S TX Power Trouble (E-GSM) TX Power Trouble (E-GSM)

57. VK Quality Group GSM C/S TX Power Trouble (E-GSM) TX Power Trouble (E-GSM)

58. VK Quality Group GSM C/S RX Sensitivity Trouble (E-GSM) RX Sensitivity Trouble (E-GSM)

59. VK Quality Group GSM C/S RX Sensitivity Trouble (E-GSM) RX Sensitivity Trouble (E-GSM)

60. VK Quality Group GSM C/S Main Parts List APPENDIX. ELECTRICAL PARTS LIST

61. VK Quality Group GSM C/S Main Parts List Main Parts List

62. VK Quality Group GSM C/S

63. Main Parts List Main Parts List

64. VK Quality Group GSM C/S Main Parts List Main Parts List

65. VK Quality Group GSM C/S Main Parts List Main Parts List

66. VK Quality Group GSM C/S

67. THANK YOU !