LG KG270 Service Manual - Page 2

Table Of Contents - keypad

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Table Of Contents 1. INTRODUCTION 5 1.1 Purpose 5 1.2 Regulatory Information 5 2. PERFORMANCE 7 2.1 H/W Features 7 2.2 S/W Features 8 3. TECHNICAL BRIEF 14 3.1 Digital Main Processor(PMB7880).........14 3.2 Power Amplifier Module (SKY77318) ....22 3.3 26 MHz Clock (DCXO 24 3.4 RTC(32.768KHz Crystal 25 3.5 LCD Interface(3-wire SPI interface) .......26 3.6 SIM Card Interface 28 3.7 KEYPAD Interface 29 3.8 Battery Charging Block Interface ...........30 3.9 RF Interface 31 3.10 Audio Interface 33 3.11 Key LED Interface 37 3.12 Vibrator Interface 38 3.13 Memory Interface 39 3.14 Power Block Interface 40 3.15 FM Radio Interface 42 4. TROUBLE SHOOTING 44 4.1 RF Trouble 44 4.2 TX Trouble 50 4.3 Power On Trouble 54 4.4 SIM Card Trouble 56 4.5 Vibrator Trouble 58 4.6 Keypad Trouble 60 4.7 RTC Trouble 62 4.8. Key backlight Trouble 64 4.9. LCD Trouble 66 4.10. Microphone Trouble 69 4.11. Receiver Trouble 71 4.12 Speaker Trouble 73 4.13 Headphone Trouble 75 4.14 Charging Trouble 77 4.15 FM Radio Trouble 79 5. DOWNLOAD 82 5.1 Download Setup 82 5.2 Download Process 83 6. BLOCK DIAGRAM 88 7. Circuit Diagram 89 8. PCB LAYOUT 93 9. ENGINEERING MODE 95 9.1 About Engineering Mode 95 9.2 Access Codes 95 9.3 Key Operation 95 9.4 Engineering Mode Menu Tree 95 10. CALIBRATION 92 10.1 Test Equipment Setup 92 10.2 Calibration Steps 92 11. STAND ALONE TEST 109 11.1 Test Program Setting 109 11.2 Tx Test 111 11.3 RX Test 112 12. EXPLODED VIEW & REPLACEMENT PART LIST ..... 113 12.1 Exploded View 113 12.2 Replacement Parts 115 12.3 Accessory 124 -3-

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- 3 -
1. INTRODUCTION
...............................
5
1.1 Purpose
..................................................
5
1.2 Regulatory Information
............................
5
2. PERFORMANCE
...............................
7
2.1 H/W Features
...........................................
7
2.2 S/W Features
...........................................
8
3. TECHNICAL BRIEF
........................
14
3.1 Digital Main Processor(PMB7880)
.........
14
3.2 Power Amplifier Module (SKY77318)
....
22
3.3 26 MHz Clock (DCXO)
...........................
24
3.4 RTC(32.768KHz Crystal)
.......................
25
3.5 LCD Interface(3-wire SPI interface)
.......
26
3.6 SIM Card Interface
.................................
28
3.7 KEYPAD Interface
.................................
29
3.8 Battery Charging Block Interface
...........
30
3.9 RF Interface
...........................................
31
3.10 Audio Interface
.....................................
33
3.11 Key LED Interface
................................
37
3.12 Vibrator Interface
.................................
38
3.13 Memory Interface
.................................
39
3.14 Power Block Interface
..........................
40
3.15 FM Radio Interface
..............................
42
4. TROUBLE SHOOTING
...................
44
4.1 RF Trouble
.............................................
44
4.2 TX Trouble
.............................................
50
4.3 Power On Trouble
..................................
54
4.4 SIM Card Trouble
...................................
56
4.5 Vibrator Trouble
.....................................
58
4.6 Keypad Trouble
......................................
60
4.7 RTC Trouble
..........................................
62
4.8. Key backlight Trouble
...........................
64
4.9. LCD Trouble
..........................................
66
4.10. Microphone Trouble
............................
69
4.11. Receiver Trouble
.................................
71
4.12 Speaker Trouble
..................................
73
4.13 Headphone Trouble
.............................
75
4.14 Charging Trouble
.................................
77
4.15 FM Radio Trouble
................................
79
5. DOWNLOAD
.......................................
82
5.1 Download Setup
.....................................
82
5.2 Download Process
.................................
83
6. BLOCK DIAGRAM
..........................
88
7. Circuit Diagram
..............................
89
8. PCB LAYOUT
..................................
93
9. ENGINEERING MODE
....................
95
9.1 About Engineering Mode
.......................
95
9.2 Access Codes
........................................
95
9.3 Key Operation
........................................
95
9.4 Engineering Mode Menu Tree
...............
95
10. CALIBRATION
..............................
92
10.1 Test Equipment Setup
.........................
92
10.2 Calibration Steps
..................................
92
11. STAND ALONE TEST
.................
109
11.1 Test Program Setting
.........................
109
11.2 Tx Test
...............................................
111
11.3 RX Test
..............................................
112
12. EXPLODED VIEW &
REPLACEMENT PART LIST
.....
113
12.1 Exploded View
..................................
113
12.2 Replacement Parts
............................
115
12.3 Accessory
.........................................
124
Table Of Contents