LG B2100 User manual
Service Manual Model : B2100
Service Manual
B2100
P/N : MMBD0047901 Date: April, 2005 / Issue 1.0
Service Manual / 3
1. INTRODUCTION
Table Of Contents
1. INTRODUCTION................................ 6
1.1 Purpose ............................................. 6
1.2 Regulatory Information .......................... 6
1.3 Abbreviations ............................................. 8
2. PERFORMANCE ............................... 10
2.1 H/W Feature ..................................... 10
2.2 Technical Specification ............................. 11
3. TECHNICAL BRIEF ........................... 16
3.1 General Description of RF parts ...... 16
3.2 Power Amplifier Module .................... 22
3.3 13 MHz Clock ................................... 23
3.4 Power Supplies and Control Signals... 23
3.5 Digital Main Processor ...................... 25
3.6 Analog Main Processor ...................... 31
3.7 Display and Interface ............................. 41
3.8 Keypad Switches and Scanning ............ 43
3.9 Microphone ............................................ 44
3.10 Main Speaker......................................... 44
3.11 Headset Interface......................................45
3.12 Key Back-light Illumination .............. 46
3.13 Vibrator......................................... 47
4. TROUBLE SHOOTING .................. 48
4.1 RX Troble ................................................. 48
4.2 Tx Trouble ............................................ 56
4.3 Power On Trouble................................. 64
4.4 Charging Trouble ................................ 66
4.5 Vibrator Trouble .................................. 68
4.6 LCD Trouble ....................................... 70
4.7 CameraTrouble .................................. 72
4.8 Speaker Trouble ................................. 74
4.9 Sim Card Trouble ................................ 76
4.10 Earphone Trouble ............................. 78
4.11 Key Backlight Trouble ...................... 80
4.12 Receiver Trouble .............................. 82
4.13 Microphone Trouble .......................... 84
4.14 RTC Trouble ..................................... 86
4.15 Indication LED Trouble .................... 88
5. DOWNLOAD AND
CALIBRATION ................................. 90
5.1 Download ......................................... 90
5.2 Calibration ........................................ 97
6. BLOCK DIAGRAM .......................... 100
7. CIRCUIT DIAGRAM ................................ 102
7.1 MAIN ............................................. 102
7.2 AUDIO & MIDI .................................. 103
7.3 MEMORY & MMI & IO ............................ 104
7.4 LCD CONN ............................................. 105
Service Manual / 5
1. INTRODUCTION
7.5 RF Circuit ............................................... 106
7.6 CAMERA ................................................ 107
8. PCB LAYOUT .............................. 108
9. ENGINEERING MODE ................... 109
9.1 BB Test [MENU 1] .............................110
9.2 RF Test [MENU 2] .............................113
9.3 MF mode [MENU 3] ..............................114
9.4 Trace option [MENU 4] .........................115
9.5 Call timer [MENU 5] ..........................115
9.6 Fact. Reset [MENU 6] ........................115
9.7 S/W version [MENU 7] .......................115
10. STAND ALONE TEST ................... 116
10.1 Introduction ........................................116
10.2 Setting Method ..................................116
10.3 Means of Test ....................................117
11. AUTO CALIBRATION ................... 119
11.1 Overview ............................................119
11.2 Requirements ....................................119
11.3 Menu and Settings ...............................119
11.4 AGC ......................................................121
11.5 APC .......................................................121
11.6 ADC ......................................................121
11.7 Setting ..................................................121
11.8 How to do calibration .......................121
12. EXPLODED VIEW &
REPLACEMENT PART LIST ........ 123
12.1 Exploded View .................................. 123
12. 2 Replacement Parts
<Mechanic component> .............................124
12. 2 Replacement Parts
<Main component> ................................ 126
12. 3 Accessory ................................................ 136
Table Of Contents
6 /Service Manual
1. INTRODUCTION
1. INTRODUCTION
1.1 Purpose
This manual provides the information necessary to repair, calibration, description and download the features
of this model.
1.2 Regulatory Information
A. Security
Toll fraud, the unauthorized use of telecommunications system by an unauthorized part (for example,
persons other than your company’s employees, agents, subcontractors, or person working on your
company’s behalf) can result in substantial additional charges for your telecommunications services.
System users are responsible for the security of own system. There are may be risks of toll fraud
associated with your telecommunications system. System users are responsible for programming and
configuring the equipment to prevent unauthorized use. The manufacturer does not warrant that this
product is immune from the above case but will prevent unauthorized use of common-carrier
telecommunication service of facilities accessed through or connected to it.
The manufacturer will not be responsible for any charges that result from such unauthorized use.
B. Incidence of Harm
If a telephone company determines that the equipment provided to customer is faulty and possibly
causing harm or interruption in service to the telephone network, it should disconnect telephone service
until repair can be done. A telephone company may temporarily disconnect service as long as repair is
not done.
C. Changes in Service
A local telephone company may make changes in its communications facilities or procedure. If these
changes could reasonably be expected to affect the use of the this phone or compatibility with the network,
the telephone company is required to give advanced written notice to the user, allowing the user to take
appropriate steps to maintain telephone service.
D. Maintenance Limitations
Maintenance limitations on this model must be performed only by the manufacturer or its authorized agent.
The user may not make any changes and/or repairs expect as specifically noted in this manual. Therefore,
note that unauthorized alternations or repair may affect the regulatory status of the system and may void
any remaining warranty.
Service Manual / 7
1. INTRODUCTION
E. Notice of Radiated Emissions
This model complies with rules regarding radiation and radio frequency emission as defined by local
regulatory agencies. In accordance with these agencies, you may be required to provide information such as
the following to the end user.
F. Pictures
The pictures in this manual are for illustrative purposes only; your actual hardware may look slightly different.
G. Interference and Attenuation
Phone may interfere with sensitive laboratory equipment, medical equipment, etc.Interference from
unsuppressed engines or electric motors may cause problems.
H. Electrostatic Sensitive Devices
ATTENTION
Boards, which contain Electrostatic Sensitive Device (ESD), are indicated by the sign. Following
information is ESD handling:
U Service personnel should ground themselves by using a wrist strap when exchange system boards.
U When repairs are made to a system board, they should spread the floor with anti-static mat which is also
grounded.
U Use a suitable, grounded soldering iron.
U Keep sensitive parts in these protective packages until these are used.
U When returning system boards or parts like EEPROM to the factory, use the protective package as
described.
8 /Service Manual
1. INTRODUCTION
1.3 Abbreviations
For the purposes of this manual, following abbreviations apply:
APC Automatic Power Control
BB Baseband
BER Bit Error Ratio
CC-CV Constant Current - Constant Voltage
DAC Digital to Analog Converter
DCS Digital Communication System
dBm dB relative to 1 milli watt
DSP Digital Signal Processing
EEPROM Electrical Erasable Programmable Read-Only Memory
ESD Electrostatic Discharge
FPCB Flexible Printed Circuit Board
GMSK Gaussian Minimum Shift Keying
GPIB General Purpose Interface Bus
GSM Global System for Mobile Communications
IPUI International Portable User Identity
IF Intermediate Frequency
LCD Liquid Crystal Display
LDO Low Drop Output
LED Light Emitting Diode
OPLL Offset Phase Locked Loop
PAM Power Amplifier Module
PCB Printed Circuit Board
PGA Programmable Gain Amplifier
PLL Phase Locked Loop
PSTN Public Switched Telephone Network
RF Radio Frequency
RLR Receiving Loudness Rating
RMS Root Mean Square
RTC Real Time Clock
SAW Surface Acoustic Wave
SIM Subscriber Identity Module
SLR Sending Loudness Rating
SRAM Static Random Access Memory
PSRAM Pseudo SRAM
STMR Side Tone Masking Rating
TA Travel Adapter
Service Manual / 9
1. INTRODUCTION
TDD Time Division Duplex
TDMA Time Division Multiple Access
UART Universal Asynchronous Receiver/Transmitter
VCO Voltage Controlled Oscillator
VCTCXO Voltage Control Temperature Compensated Crystal Oscillator
WAP Wireless Application Protocol
10 /Service Manual
2. PERFORMANCE
2. PERFORMANCE
2.1 H/W Features
Item Feature Comment
Li-ion, 780mAh
Standard Battery Battery Size : 104.5 (W) 44(H) 15.8(T) [mm]
Battery Weight : 20kg
Under the minimum current consumption
Stand by Current environmenth (such as paging period 9), the level of
standby current is below 4mA.
Talk time Up to 2 hours (GSM TX Level 5)
Stand by time Up to 200 hours (Paging Period: 9, RSSI: -85 dBm)
Charging time Approx. Under 3.75 hours
RX Sensitivity GSM, EGSM: -104dBm, DCS: -104dBm
TX output power GSM, EGSM : 33dBm(Level 5),
DCS, PCS : 30dBm(Level 0)
GPRS compatibility Class 10
SIM card type 3V Small Only
Display Main LCD : CSTN 128 128 pixel 65K Color
Hard icons. Key Pad
0 ~ 9, #, *,
Status Indicator Menu Key, Clear Key, Camera Key
Send Key, END/PWR Key
Soft Key(Left/Right)
ANT Internal
EAR Phone Jack Yes (Mono)
PC Synchronization Yes
Speech coding EFR/FR/HR
Data and Fax
Vibrator Yes
Loud Speaker No
Voice Recoding Yes
Microphone Yes
Speaker/Receiver One way dual speaker
Travel Adapter Yes
MIDI 40 Poly (Mono SPK)
MP3/AAC No
Options Data Cable
Service Manual / 11
2. PERFORMANCE
2.2 Technical Specification
Item Description Specification
EGSM
TX: 890 + (n-1024) 0.2 MHz
RX: 935 + (n-1024) 0.2 MHz (n=975~1024)
DCS
1Frequency Band TX: 1710 + (n-512) 0.2 MHz
RX: 1805 + (n-512) 0.2 MHz (n=512~885)
PCS
TX: 1810 + (n-512) 0.2 MHz
RX: 1905 + (n-512) 0.2 MHz (n=512~885)
2 Phase Error RMS < 5 degrees
Peak < 20 degrees
3Frequency Error < 0.1 ppm
GSM, EGSM
Level Power Toler. Level Power Toler.
533dBm 2dB 13 17dBm 3dB
631dBm 3dB 14 15dBm 3dB
729dBm 3dB 15 13dBm 3dB
827dBm 3dB 16 11dBm 5dB
925dBm 3dB 17 9dBm 5dB
10 23dBm 3dB 18 7dBm 5dB
11 21dBm 3dB 19 5dBm 5dB
12 19dBm 3dB
4Power Level DCS, PCS
Level Power Toler. Level Power Toler.
030dBm 2dB 8 14dBm 3dB
128dBm 3dB 9 12dBm 4dB
226dBm 3dB 10 10dBm 4dB
324dBm 3dB 11 8dBm 4dB
422dBm 3dB 12 6dBm 4dB
520dBm 3dB 13 4dBm 4dB
618dBm 3dB 14 2dBm 5dB
716dBm 3dB 15 0dBm 5dB
12 /Service Manual
2. PERFORMANCE
Item Description Specification
GSM, EGSM
Offset from Carrier (kHz). Max. dBc
100 +0.5
200 -30
250 -33
400 -60
600~ <1,200 -60
1,200~ <1,800 -60
1,800~ <3,000 -63
3,000~ <6,000 -65
5Output RF Spectrum 6,000 -71
(due to modulation)
GSM, EGSM
Offset from Carrier (kHz). Max. dBc
100 +0.5
200 -30
250 -33
400 -60
600~ <1,200 -60
1,200~ <1,800 -60
1,800~ <3,000 -65
3,000~ <6,000 -65
6,000 -73
GSM, EGSM
Offset from Carrier (kHz). Max. dBc
400 -19
600 -21
Output RF Spectrum 1,200 -21
6(due to switching 1,800 -24
transient)
GSM, EGSM
Offset from Carrier (kHz). Max. dBc
400 -19
600 -21
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