LG C3380 User manual
Service Manual Model : C3380
Date: November, 2005 / Issue 1.0
Service Manual
C3380
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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 Features.......................................... 9
2.2 Technical Specification ......................... 10
3. TECHNICAL BRIEF ...................... 16
3.1 Transceiver ........................................... 16
3.2 Power Amplifier Module ....................... 21
3.3 26 MHz Clock........................................ 22
3.4 Power Supplies for RF Circuits ............. 23
3.5 Digital Main Processor .......................... 24
3.6 Analog Main & Power Management
Processor.................................................. 30
3.7 Display and Interface ............................ 40
3.8 Camera Interface .................................. 42
3.9 Keypad Switches and Scanning ........... 44
3.10 Microphone ......................................... 45
3.11 Main Speaker...................................... 45
3.12 Headset Interface................................ 46
3.13 Key Back-light Illumination.................. 47
3.14 LCD Back-light Illumination................. 48
3.15 VIBRATOR.......................................... 49
3.16 BLUETOOTH .......................................50
4. TROUBLE SHOOTING ................. 52
4.1 RX Trouble............................................ 52
4.2 TX Trouble ............................................ 60
4.3 Power On Trouble................................. 68
4.4 Charging Trouble ...................................70
4.5 Vibrator Trouble .....................................72
4.6 LCD Trouble...........................................74
4.7 Camera Trouble .....................................76
4.8 Speaker Trouble ....................................78
4.9 SIM Card Interface Trouble....................80
4.10 Earphone Trouble ................................82
4.11 KEY backlight Trouble .........................84
4.12 Receiver Trouble .................................86
4.13 Microphone Trouble .............................88
4.14 RTC Trouble ........................................90
4.15 Indication LED Trouble ........................92
4.16 Folder on/off Trouble............................94
4.17 Bluetooth Trouble.................................96
5. DOWNLOAD AND CALIBRATION.. 100
5.1 Download ............................................ 100
5.2 Calibration............................................106
6. BLOCK DIAGRAM ...................... 109
7. CIRCUIT DIAGRAM ..................... 111
8. PCB LAYOUT ............................... 117
9. ENGINEERING MODE ..................119
9.1 BB Test [MENU 1]................................120
9.2 RF Test [MENU 2]................................122
9.3 MF mode [MENU 3] .............................122
9.4 Trace option [MENU 4] ........................123
9.5 Call timer [MENU 5] .............................123
9.6 Fact. Reset [MENU 6] ..........................123
9.7 S/W version..........................................123
10. STAND ALONE TEST .................124
10.1 Introduction ........................................124
10.2 Setting Method...................................124
10.3 Means of Test ....................................125
11. AUTO CALIBRATION..................127
11.1 Overview ............................................127
11.2 Requirements.....................................127
11.3 Menu and Settings .............................127
11.4 AGC ...................................................129
11.5 APC....................................................129
11.6 ADC ...................................................129
11.7 Setting................................................129
11.8 How to do calibration .........................129
12. EXPLODED VIEW &
REPLACEMENT PART LIST ..... 131
12.1 Exploded View .................................. 131
12.2 Replacement Parts ............................133
12.3 Accessory ......................................... 150
Table Of Contents
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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
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
1. INTRODUCTION
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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
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) ×53.55(H) ×5.7(T) [mm]
Battery Weight : 25g
Under the minimum current consumption environment
Stand by Current (such as paging period 9), the level of standby current
is below 4mA.
Talk time Up to 3.5 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 Small
Display Main LCD : CSTN 128 x 160 pixel 65K Color
Sub LCD : STN 96 x 64 pixel MONO Color
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 EFR/FR/HR
Data and Fax 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
1Frequency 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)
2Phase Error RMS < 5 degrees
Peak < 20 degrees
3Frequency Error < 0.1 ppm
GSM, EGSM
Level Power Toler. Level Power Toler.
533 dBm 2dB 13 17 dBm 3dB
631 dBm 3dB 14 15 dBm 3dB
729 dBm 3dB 15 13 dBm 3dB
827 dBm 3dB 16 11 dBm 5dB
925 dBm 3dB 17 9 dBm 5dB
10 23 dBm 3dB 18 7 dBm 5dB
11 21 dBm 3dB 19 5 dBm 5dB
4Power Level 12 19 dBm 3dB
DCS
Level Power Toler. Level Power Toler.
030 dBm 2dB 8 14 dBm 3dB
128 dBm 3dB 9 12 dBm 4dB
226 dBm 3dB 10 10 dBm 4dB
324 dBm 3dB 11 8 dBm 4dB
422 dBm 3dB 12 6 dBm 4dB
520 dBm 3dB 13 4 dBm 4dB
618 dBm 3dB 14 2 dBm 5dB
716 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 RF 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 RF Spectrum 400 -19
6(due to switching transient) 600 -21
1,200 -21
1,800 -24
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