LG B2070 Manuale utente
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edoM B2000
Service Manual
B2000
P/N : MMBD0047201 Date : March 2005/ Issue 1.0
Date: October, 2005 / Issue 1.0
Service Manual
B2070
Model : B2070
Table Of Contents
1. INTRODUCTION..........................2
1.1 Purpose ...........................................2
1.2 Regulatory Information ....................2
1.3 Abbreviations ..................................4
2. PERFORMANCE ........................ 6
2.1 H/W Feature ...................................6
2.2 Technical Specification ..................8
3. TECHNICAL BRIEF ..................13
3.1 Transceiver ...................................13
3.2 Power Amplifier Module ..................19
3.3 13 MHz Clock ............................... 20
3.4 Power Supplies of RF circuits ........20
3.5 Digital Main Processor ...................22
3.6 Analog Main & Power
Management Processor ................28
3.7 Display Interface ............................. 38
3.8 Radio Interface ..............................40
3.9 Keypad Switches and Scanning .... 41
3.10 Microphone ..................................42
3.11 Main Speaker ............................. 42
3.12 Headset interface ........................43
3.13 Key Back-light Illumination .......... 44
3.14 Vibrator ........................................45
4. TROUBLE SHOOTING ............. 46
4.1 RX Trouble ................................... 46
4.2 TX Trouble ................................... 53
4.3 Power On Trouble .........................61
4.4 Charging Trouble........................... 63
4.5 Vibrator Trouble..............................65
4.6 LCD Trouble.................................. 67
4.7 Radio Trouble ................................69
4.8 Speaker Trouble .............................71
4.9 SIM card interface trouble ............ 74
4.10 Earphone Trouble .........................76
4.11 Key Backlight Trouble ..................78
4.12 Receiver Trouble ..........................80
4.13 Microphone Trouble .................... 82
4.14 RTC Trouble .................................84
4.15 Indication LED Trouble..................86
4.16 PTT Trouble .................................88
4.17 Speakerphone Trouble ..................89
5. DOWNLOAD AND
CALIBRATION .......................91
5.1 Download .......................................91
5.2 Calibration .......................................96
6. BLOCK DIAGRAM.....................99
7. CIRCUIT DIAGRAM .................101
8. PCB LAYOUT .........................106
9. ENGINEERING MODE .............109
9.1 BB Test [MENU 1] .........................110
9.2 RF Test [MENU 2] .........................111
9.3 MF mode [MENU 3].......................112
9.4 Trace option [MENU 4] ..................113
9.5 Call timer [MENU 5] ......................113
9.6 Fact. Reset [MENU 6] ...................113
9.7 S/W version [MENU 7] ..................113
10. STAND ALONE TEST.............114
10.1 Introduction ...............................114
10.2 Setting Method............................114
10.3 Means of Test ............................115
11. AUTO CALIBRATION ...........117
11.1 Overview.....................................117
11.2 Requirements..............................117
11.3 Menu and Settings ......................117
11.4 AGC............................................119
11.5 APC............................................119
11.6 ADC............................................119
11.7 Setting........................................119
11.8 How to do calibration...................119
12. EXPLODED VIEW &
REPLACEMENT PART LIST ..121
12.1 Exploded View............................121
12.2 Replacement Parts
<Mechanic component>...............123
<Main component>......................125
12.3 Accessory ....................................138
- 2 -
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 byan 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
Alocal 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.
- 3 -
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:
• Service personnel should ground themselves by using a wrist strap when exchange
systemboards.
• 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.
- 4 -
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
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
EEPROM Electrical Erasable Programmable Read-Only Memory
- 5 -
1. INTRODUCTION
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
SAW Surface Acoustic Wave
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
- 6 -
2. PERFORMANCE
2. PERFORMANCE
2.1 H/W Features
Item Feature Comment
Li-ion, 780 mAh
Standard Battery Battery Size: 105.5(W) x 44(H) x 15.8(T) [mm]
Battery Weight: TBD
Under the minimum current consumption environment
Stand by Current (such as paging period 9), the level of standby current
is below 4mA.
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 x 128 pixel 65K Color
Hard icons. Key Pad
Status Indicator 0 ~ 9, #, *, 4
Menu Key, Clear Key
Send Key, END/PWR Key
ANT Internal
EAR Phone Jack Yes
PC Synchronization Yes
Speech coding EFR/FR/HR
Data and Fax
Vibrator Yes
Yes
Loud Speaker No
Voice Recording Yes
Soft Key(Left/Right)
(stereo)
Microphone Yes
Talk time Up to 2 hours (GSM TX Level 5)
- 7 -
2. PERFORMANCE
Item Feature Comment
Speaker / Receiver One way dual speaker
Travel Adapter Yes
MP3/AAC
Options Data Cable
MIDI 40 Poly (Mono SPK)
No
- 8 -
2. PERFORMANCE
2.2 Technical Specification
I
I
tem Description Specification
1Frequency Band
TX : 890 + (n-1024) × 0.2 MHz
RX : 935 + (n-1024) × 0.2 MHz (n=975~1024)
EGSM
TX : 1710 + (n -512) × 0.2 M z
RX : 1805 + (n –512) x 0.2 MHz (n=512~885)
D
P
CS
CS
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
4PowerLevel
Level Power Toler. Level Power Toler.
6 31dBm ±3dB 14 15dBm ± 3dB
7 29dBm ±3dB 15 13dBm ± 3dB
8 27dBm ±3dB 16 11dBm ± 5dB
9 25dBm ±3dB 17 9dBm ± 5dB
10 23dBm ±3dB 18 7dBm ± 5dB
11 21dBm ±3dB 19 5dBm ± 5dB
12 19dBm ±3dB
GSM,EGSM
EGSM
,
5 33dBm ±2dB 13 17dBm ± 3dB
Level Power Toler. Level Power Toler.
1 28dBm ±3dB 9 12dBm ± 4dB
2 26dBm ±3dB 10 10dBm ± 4dB
3 24dBm ±3dB 11 8dBm ± 4dB
4 22dBm ±3dB 12 6dBm ± 4dB
5 20dBm ±3dB 13 4dBm ± 4dB
6 18dBm ±3dB 14 2dBm ± 5dB
7 16dBm ±3dB 15 0dBm ± 5dB
DCS
SCS
PCS
0 30dBm ±2dB 8 14dBm ± 3dB
- 9 -
2. PERFORMANCE
Item Description Specification
GSM, EGSM
Offset from Carrier (kHz). Max. dBc
100
200
250
400
600 ~ <1,200
1,200 ~ <1,800
1,800 ~ <3,000
3,000 ~ <6,000
5 Output RF Spectrum 6,000
(due to modulation)
DCS, PCS,
Offset from Carrier (kHz). Max. dBc
100
200
250
400
600 ~ <1,200
1,200 ~ <1,800
1,800 ~ <3,000
3,000 ~ <6,000
6,000
GSM, EGSM
Offset from Carrier (kHz). Max. dBm
400
600
1,200
1,800
(due to switching
transient)
6 Output RF Spectrum
–30
–33
–60
–60
–60
–63
–65
–71
+0.5
–30
–33
–60
–60
–60
–65
–65
–73
+0.5
–19
–21
–21
–24
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