LG F7100 User manual

Service Manual Model : F7100
Service Manual
F7100
P/N : MMBD0035501 Date: July, 2004 / Issue 1.0

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1. INTRODUCTION.................................... 5
1.1 Purpose ................................................. 5
1.2 Regulatory Information .......................... 5
A. Security ............................................. 5
B. Incidence of Harm ............................. 5
C. Changes in Service ........................... 5
D. Maintenance Limitations ................... 5
E. Notice of Radiated Emissions ............ 5
F. Pictures ............................................. 6
G. Interference and Attenuation ............ 6
H. Electrostatic Sensitive Devices ......... 6
1.3 Abbreviations ......................................... 6
2. PERFORMANCE .................................. 8
2.1 H/W Feature .......................................... 8
2.2 Technical Specification .......................... 9
3. TECHNICAL BRIEF ........................... 13
3.1 Transceiver (SI4205-BM, U402) .......... 13
3.2 Power Amplifier Module
(RF3133, U401) .................................... 17
3.3 13 MHz Clock ...................................... 18
3.4 Power Supplies for RF Circuits ............ 18
3.5 Digital Main Processor
(AD6525, U101) ................................... 19
3.6 Analog Main Processor (AD6521, U102)
.............................................................. 23
3.7 Power Management IC
(ADP3522, U202) ................................ 26
3.8 Memory (U201) .................................... 28
3.9 LCD and LCD Backlight ....................... 30
3.10 Keypad Switches and Key Backlight
Illumination ......................................... 33
3.11 Microphone ........................................ 29
3.12 Dual Mode Speaker and MIDI IC ....... 34
3.13 Headset Jack Interface ...................... 36
3.14 Compass ............................................ 37
4. TROUBLE SHOOTING ..................... 38
4.1 RF Components ................................... 38
4.2 RX Trouble ........................................... 39
4.2.1 Checking Regulator Circuit ......... 40
4.2.2 Checking VCTCXO Circuit ......... 41
4.2.3 Checking Transceiver
Control Signal ............................. 42
4.2.4 Checking Antenna Switch &
Mobile Switch ............................. 43
4.2.5 Checking SAW Filter .................. 44
4.2.6 Checking RX IQ .......................... 45
4.3 TX Trouble ........................................... 46
4.3.1 Checking Regulator Circuit ......... 47
4.3.2 Checking VCTCXO Circuit ......... 48
4.3.3 Checking PLL Control Signal ...... 49
4.3.4 Checking TX IQ .......................... 50
4.3.5 Checking PAM Control Signal .....51
4.3.6 Checking Antenna Switch &
Mobile Switch ............................. 52
4.3.7 Checking Antenna Contact ......... 54
4.4 Power On Trouble ................................ 55
4.5 Charging Trouble ................................. 57
4.6 LCD Trouble ........................................ 59
4.7 Receiver Trouble ................................. 61
4.8 Speaker Trouble .................................. 63
4.9 MIC Trouble ......................................... 65
4.10 Vibrator Trouble ................................. 66
4.11 Key Backlight LED Trouble ................ 68
4.12 SIM Detect Trouble ............................ 69
4.13 Ear Jack Trouble ................................ 70
4.14 Compass Trouble .............................. 73
5. DISASSEMBLY INSTRUCTION ..... 76
5.1 Disassembly ........................................ 76
6. DOWNLOAD AND CALIBRATION
.................................................................... 80
6.1 Download ............................................. 80
A. Download Setup .............................. 80
B. Download Procedure ....................... 81
6.2 Calibration ............................................ 87
A. Equipment List ................................ 87
B. Equipment Setup ............................. 87
C. Test Jig Operation ........................... 88
Table Of Contents

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D. Procedure ....................................... 89
7. BLOCK DIAGRAM ............................. 90
8. CIRCUIT DIAGRAM ........................... 91
9. PCB LAYOUT ....................................... 96
10. ENGINEERING MODE .................... 99
10.1 BB Test [MENU 1] ......................... 100
10.1.1 LED ..................................... 100
10.1.2 LCD ..................................... 100
10.1.3 Backligh .............................. 100
10.1.4 Buzzer ................................. 100
10.1.5 Vibrator ............................... 100
10.1.6 ADC (Analog to Digital
Converter) ........................... 101
10.1.7 BATTERY ........................... 101
10.1.8 Audio ................................... 101
10.1.9 DAI (Digital Audio Interface)
............................................. 101
10.2 RF Test [MENU 2] ......................... 102
10.2.1 SAR test .............................. 102
10.3 MF Mode [MENU 3] ....................... 102
10.3.1 All auto test ......................... 102
10.3.2 LED ..................................... 102
10.3.3 Backlight ............................. 102
10.3.4 Buzzer ................................. 102
10.3.5 Vibrator ............................... 102
10.3.6 LCD ..................................... 103
10.3.7 Keypad ................................ 103
10.3.8 MicSpkTest ......................... 103
10.3.9 Compass ............................. 103
11. STAND ALONE TEST ................... 104
11.1 Introduction .................................... 104
A. Tx Test ...................................... 104
B. Rx Test ...................................... 104
11.2 Setting Method .............................. 104
A. COM port ................................... 104
B. Tx .............................................. 104
C. Rx .............................................. 104
11.3 Means of Test ................................ 105
12. AUTO CALIBRATION ................... 107
12.1 Overview ........................................ 107
12.2 Requirements ................................ 107
12.3 Menu and settings ......................... 107
12.4 AGC ............................................... 109
12.5 APC ............................................... 109
12.6 ADC ............................................... 109
12.7 Setting ........................................... 109
12.8 How to do calibration ..................... 109
13. EXPLODED VIEW &
REPLACEMENT PART LIST ...... 111
13.1 Exploded View ............................... 111
13.2 Replacement Part
(Mechanic components) ................. 113
(Main components) ......................... 115
13.3 Accessories ................................... 127

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.
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.
1. INTRODUCTION

1. INTRODUCTION
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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.
1.3 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 milliwatt
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

1. INTRODUCTION
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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 Paeudo 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

2.1 H/W Features
2. PERFORMANCE
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2.PERFORMANCE
Item Feature Comment
Standard Battery Li-ion,820mAh
Size : (open) 121.2 X 45.5 X 21mm
(close) 97 X 45.5 X 21mm
Weight : 91g
Charging Time 3Hours
Display 128X160 pixel 65K STN LCD
ANT Internal
Ear Phone Jack Yes
PC synchronization Yes
Speech Coding EFR/FR/HR
Data and Fax Yes
Vibrator Yes
Loud Speaker Yes
Voice Recording Yes
C-mike Yes
Receiver Yes
Travel Adaptor Yes
Option Data Kit

2.2 Technical Specification
2. PERFORMANCE
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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)
400 -19
600 -21
1,200 -21
6Output RF Spectrum 1,800 -24
(due to switching transient) GSM
Offset from Carrier (kHz) Max. (dBm)
400 -22
600 -24
1,200 -24
1,800 -27
7Spurious Emissions Conduction, Emission Status

2. PERFORMANCE
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Item Description Specification
GSM, EGSM
8Bit Error Ratio BER (Class II) < 2.439% @-102 dBm
DCS
BER (Class II) < 2.439% @-100 dBm
9RX Level Report Accuracy ± 3 dB
10 SLR 8 ± 3 dB
Frequency (Hz) Max.(dB) Min.(dB)
100 -12 -
200 0 -
300 0 -12
11 Sending Response 1,000 0 -6
2,000 4 -6
3,000 4 -6
3,400 4 -9
4,000 0 -
12 RLR 2 ± 3 dB
Frequency (Hz) Max.(dB) Min.(dB)
100 -12 -
200 0 -
300 2 -7
500 *-5
13 Receiving Response 1,000 0 -5
3,000 2 -5
3,400 2 -10
4,000 2
* Mean that Adopt a straight line in between 300 Hz
and 1,000 Hz to be Max. level in the range.
14 STMR 13 ± 5 dB
15 Stability Margin > 6 dB
dB to ARL (dB) Level Ratio (dB)
-35 17.5
-30 22.5
16 Distortion -20 30.7
-10 33.3
033.7
731.7
10 25.5
17 Side Tone Distortion Three stage distortion < 10%
18 System frequency (13 MHz) tolerance ≤2.5 ppm