LG C2100 User manual

Service Manual Model : C2100
Service Manual
C2100
P/N : MMBD0048201 Date: April, 2005 / Issue 1.0

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1. INTRODUCTION .............................. 5
1.1 Purpose................................................... 5
1.2 Regulatory Information............................ 5
1.3 Abbreviations .......................................... 7
2. PERFORMANCE.............................. 9
2.1 H/W eatures.......................................... 9
2.2 Technical Specification ......................... 10
3. TECHNICAL BRIEF ....................... 15
3.1 Transceiver (SI4205, U505).................. 15
3.2 Power Amplifier Module
(SKY77325, U501)................................ 21
3.3 26 MHz Clock (VCTCXO, X500)........... 22
3.4 Power Supplies for R Circuits
(R LDO, U503).................................... 22
3.5 Digital Main Processor
(AD6527, U101) .................................... 23
3.6 Analog Main & Power Management
Processor (AD6537B, U102) ................ 29
3.7 Display and Interface ............................ 39
3.8 Keypad Switches and Scanning ........... 41
3.9 Microphone ........................................... 42
3.10 Main Speaker...................................... 42
3.11 Headset Interface................................ 43
3.12 Key Back-light Illumination.................. 44
3.13 LCD Back-light Illumination................. 45
3.14 VIBRATOR.......................................... 46
4. TROUBLESHOOTING ................... 47
4.1 RX Trouble............................................ 47
4.2 TX Trouble ............................................ 55
4.3 Power On Trouble................................. 63
4.4 Charging Trouble .................................. 65
4.5 Vibrator Trouble .................................... 67
4.6 LCD Trouble.......................................... 69
4.7 MIC Trouble .......................................... 71
4.8 SIM Card Interface Trouble................... 73
4.9 Earphone Trouble ................................. 75
4.10 KEY backlight Trouble ........................ 77
4.11 Receiver Trouble................................. 79
4.12 Microphone Trouble ............................ 81
4.13 RTC Trouble ....................................... 83
4.14 Indication LED Trouble ....................... 85
4.15 older on/off Trouble........................... 87
5. DOWNLOAD AND
CALIBRATION ............................... 89
5.1 Download .............................................. 89
5.2 Calibration............................................. 95
6. BLOC DIAGRAM ......................... 98
7. CIRCUIT DIAGRAM ....................... 99
8. PCB LAYOUT............................... 105
9. ENGINEERING MODE ................. 107
9.1 BB Test [MENU 1]............................... 108
9.2 R Test [MENU 2]............................... 109
9.3 M mode [MENU 3] ............................ 110
9.4 Trace option [MENU 4] ....................... 111
9.5 Call timer [MENU 5] ............................ 111
9.6 act. Reset [MENU 6] ......................... 111
9.7 S/W version......................................... 111
10. STAND ALONE TEST ................ 112
10.1 Introduction ....................................... 112
10.2 Setting Method.................................. 112
10.3 Means of Test ................................... 113
11. AUTO CALIBRATION................. 115
11.1 Overview ........................................... 115
Table Of Contents

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11.2 Requirements.................................... 115
11.3 Menu and Settings ............................ 115
11.4 AGC .................................................. 116
11.5 APC................................................... 116
11.6 ADC .................................................. 117
11.7 Setting............................................... 117
11.8 How to do calibration ........................ 117
12. EXPLODED VIEW &
REPLACEMENT PART LIST ........... 119
12.1 EXPLODED VIEW ............................ 119
12.2 Replacement Parts
<Mechanic component>.................... 121
<Main component> ........................... 123
12.3 Accessory ......................................... 135

1. INTRODUCTION
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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.
1. INTRODUCTION

1. INTRODUCTION
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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:
• Service personnel should ground themselves by using a wrist strap when exchange system boards.
• When repairs are made to a system board, they should spread the floor with anti-static mat which is
also grounded.
• Use a suitable, grounded soldering iron.
• Keep sensitive parts in these protective packages until these are used.
• When returning system boards or parts like EEPROM to the factory, use the protective package as
described.

1. INTRODUCTION
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1.3 Abbreviations
or 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 milliwatt
DSP Digital Signal Processing
EEPROM Electrical Erasable Programmable Read-Only Memory
ESD Electrostatic Discharge
PCB lexible Printed Circuit Board
GMSK Gaussian Minimum Shift Keying
GPIB General Purpose Interface Bus
GSM Global System for Mobile Communications
IPUI International Portable User Identity
I Intermediate requency
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
R Radio requency
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

1. INTRODUCTION
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STMR Side Tone Masking Rating
TA Travel Adapter
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

2. PERFORMANCE
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2.1 H/W Features
2. PERFORMANCE
Item Feature Comment
Li-ion, 1000mAh
Standard Battery Battery Size : 34.15 (W) x 53.55(H) x 5.7(T) [mm]
Battery Weight : 25g
Under the minimum current consumption
Stand by Current environment (such as paging period 9), the level of
standby current is below 4mA.
Talk time Up to 3 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: -107dBm, DCS: -107dBm
TX output power GSM, EGSM: 33dBm(Level 5),
DCS: 30dBm(Level 0)
GPRS compatibility Class 10
SIM card type 3V only
Display Main LCD : CSTN 128 x 160 pixel 65K Color
Sub LCD : STN 96 x 64 pixel MONO
Hard icons. Key Pad
0 ~ 9, #, *, Up/Down Navigation Key
Status Indicator Menu Key, Clear Key
Send Key, END/PWR Key
Soft Key(Left/Right)
ANT Internal
EAR Phone Jack Yes (mono)
PC Synchronization Yes
Speech coding E R/ R/HR
Data and ax Yes
Vibrator Yes
Loud Speaker Yes
Voice Recoding Yes
Microphone Yes
Speaker/Receiver One way dual speaker
Travel Adapter Yes
MIDI 40 Poly (Mono SPK)
Options Data Kit , CD

2. PERFORMANCE
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2.2 Technical Specification
Item Description Specification
GSM
TX: 890 + n x 0.2 MHz
RX: 935 + n x 0.2 MHz (n=1~124)
EGSM
1 requency Band TX: 890 + (n-1024) x 0.2 MHz
RX: 935 + (n-1024) x 0.2 MHz (n=975~1024)
DCS
TX: 1710 + (n-512) x 0.2 MHz
RX: 1805 + (n-512) x 0.2 MHz (n=512~885)
2 Phase Error RMS < 5 degrees
Peak < 20 degrees
3 requency Error < 0.1 ppm
GSM, EGSM
Level Power Toler. Level Power Toler.
5 33 dBm 2dB 13 17 dBm 3dB
6 31 dBm 3dB 14 15 dBm 3dB
7 29 dBm 3dB 15 13 dBm 3dB
8 27 dBm 3dB 16 11 dBm 5dB
9 25 dBm 3dB 17 9 dBm 5dB
10 23 dBm 3dB 18 7 dBm 5dB
11 21 dBm 3dB 19 5 dBm 5dB
4 Power Level 12 19 dBm 3dB
DCS
Level Power Toler. Level Power Toler.
0 30 dBm 2dB 8 14 dBm 3dB
1 28 dBm 3dB 9 12 dBm 4dB
2 26 dBm 3dB 10 10 dBm 4dB
3 24 dBm 3dB 11 8 dBm 4dB
4 22 dBm 3dB 12 6 dBm 4dB
5 20 dBm 3dB 13 4 dBm 4dB
6 18 dBm 3dB 14 2 dBm 5dB
7 16 dBm 3dB 15 0 dBm 5dB

2. PERFORMANCE
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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 R Spectrum 6,000 -71
(due to modulation) DCS
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. (dBm)
Output R Spectrum 400 -19
6(due to switching transient) 600 -21
1,200 -21
1,800 -24