LG LG-200 Manuel utilisateur

LG-200

SERVICE MANUAL

SERVICE MANUAL MODEL : LG-200

- 1 -

1. PERFORMANCE ..................................................... 2

1-1. HW Features ........................................................... 2

1-2. Memory Requirment ............................................... 2

1.3. Technical Specification ........................................... 3

1-4. GSM band RF Specifications ................................. 7

1-5. DCS band RF Specifications .................................. 8

1-6. Receiver (GSM) ...................................................... 9

1-7. Receiver (DCS) ...................................................... 9

2. TECHNICAL BRIEF .............................................. 10

2-1. Receiver ............................................................... 10

2-2. Transmitter ........................................................... 14

2-3. The PA Circuit and its Control .............................. 17

2-4. 13 MHz Clock ....................................................... 18

2-5. Main Processor and DSP ..................................... 19

2-6. Power Supplies and Control Signals .................... 21

2-7. User Interface Board ............................................ 28

2-8. Testing Set-up and Checking Signals .................. 32

2-9. Dimensions of Main Components. ........................ 43

3. TROUBLE SHOOTING ....................................... 53

3-1. Power Supply Failure ........................................... 53

3-2. Voice Function Failure .......................................... 55

3-3. Display Function Failure........................................ 55

3-4. Transmission & Receiving Failure ........................ 57

3-5. Other Function Failure........................................... 57

4. TEST POINT DATA ............................................... 60

5. ASSEMBLY INSTRUCTIONS ........................... 68

6. BLOCK DIAGRAM ............................................... 73

7. CIRCUIT DIAGRAM ............................................. 74

8. HOW TO DOWNLOAD S/W .............................. 83

9. HOW TO PROCESS CALIBRATION............... 84

10. EXPLODED VIEW .............................................. 90

11. REPLACEMENT PARTS LIST......................... 91

Table Of Contents

- 2 -

1. PERFORMANCE

1-1. HW Features

1-2. Memory Requirment

Item Feature Comment

Battery Li-Ion Battery, 600mAh

Size : 105.9x44.8x19.7mm

Weight : 89g, 77cc

PCB : M/B:99.5x38.3;K/B:99.5x39.4mm

AVG TCVR current(mA) GSM Imax(390mA),DCS Imax(320mA)

Stand by current(mA) ≤5mA

- Talk time 2.5-hour (GSM Tx Level_7)

- Stand by time 85-hour(Paging Period:2 RSSI:-85dBm)

- Charging time 1.5-hour

RX sensitivity GSM:-107dBm, DCS:-104dBm

TX output power GSM (Level 5:33dBm), DCS (Level0: 30dBm)

GPRS compatibility N/A

SIM card type 3v/5v small

Display 128x64

Status Indicator Soft Icons

Keypad : 0-9, #, *, C, P/book, up/down, on/off

ANT External

System connector : N/A

Ear Phone Jack Yes

PC synchronization N/A

Memory : 1MB

Speech coding EFR/FR

Data & Fax N/A

Vibrator Yes

Melody(for Buzzer Function) 22

Voice Recording N/A

C-Mike N/A

Receiver Yes

Speaker Phone N/A

Portable Handsfree Yes, option

Travel Adapter Yes Switching

Options

Application RAM Size ROM Size

GSM Protocol 120KB 880KB

WAP (AUR Browser) N/A N/A

Zi ezText (2 Languages at N/A N/A

the same time)

ART N/A N/A

Voice Memo (3 Minutes) N/A N/A

Phone Book 1KB 2KB

Voice Tag N/A N/A

Game & Accessory 3K 20K

GPRS N/A N/A

1. PERFORMANCE

- 3 -

Item Description Specification

1 Frequency Band GSM900 band

Tx : 890 + n*0.2 MHz

Rx : 935 + n*0.2 MHz

(n = 1 ~ 124)

GSM1800 band

Tx : 1710 + (n-512)*0.2

Rx : 1805 + (n-512)*0.2

(n = 512 ~ 885)

2 Phase error RMS < 5 degrees

Peak < 20 degrees

3 Frequency error < 0.1ppm : = 90 Hz (for GSM900) or 180 Hz (for GSM1800)

5 Power Level GSM900

Control Level Power Level Tolerance

5 33 dBm ± 2dB

6 31 dBm ± 3dB

7 29 dBm ± 3dB

8 27 dBm ± 3dB

9 25 dBm ± 3dB

10 23 dBm ± 3dB

11 21 dBm ± 3dB

12 19 dBm ± 3dB

13 17 dBm ± 3dB

14 15 dBm ± 3dB

15 13 dBm ± 3dB

16 11 dBm ± 5dB

17 9 dBm ± 5dB

18 7 dBm ± 5dB

19 5 dBm ± 5dB

GSM1800

Control Level Power Level Tolerance

0 30 dBm 2dB

1 28 dBm ± 3dB

2 26 dBm ± 3dB

3 24 dBm ± 3dB

4 22 dBm ± 3dB

5 20 dBm ± 3dB

6 18 dBm ± 3dB

7 16 dBm ± 3dB

8 14 dBm ± 3dB

9 12 dBm ± 4dB

10 10 dBm ± 4dB

11 8 dBm ± 4dB

12 6 dBm ± 4dB

13 4 dBm ± 4dB

14 2 dBm ± 5dB

15 0 dBm ± 5dB

1-3. Technical Specification

- 4 -

Item Description Specification

6 Spectrum due GSM900

to modulation Offset from Carrier(KHz). Max. dBc

100 +0.5

200 -30

250 -33

400 -60

600 ~ <1200 -60

1200 ~ <1800 -60

1800 ~ <3000 -63

3000 ~ <6000 -65

≥6000 -71

GSM1800

Offset from Carrier(KHz). Max. dBc

100 +0.5

200 -30

250 -33

400 -60

600 ~ <1200 -60

1200 ~ <1800 -60

1800 ~ <3000 -65

3000 ~ <6000 -65

≥6000 -73

7 Spectrum due to GSM900

switching transient Offset from Carrier(KHz). Max. dBc(KHz).

400 -19

600 -21

1200 -21

1800 -24

GSM1800

Offset from Carrier(KHz). Max. dBc

400 -22

600 -24

1200 -24

1800 -27

8 Spurious emissions Conduction, Emission Status, Appendix 1

Conduction, Emission Status, Appendix 2

9 Bit Error Rate GSM900

BER(Class II) <2.439% @-102dBm

DCS1800

BER(Class II) <2.439% @-100dBm

1. PERFORMANCE

- 5 -

Item Description Specification

10 Rx Level Report accuracy GSM900 GSM1800

≥-88 ≥-86 2 2

≥-101 ≥-99 3 2

< -101 < -99 4 2

11 SLR 8 ± 3 dB

12 Sending Response Frequency (Hz) Max.(dB) Min.(dB)

100 -12 /

200 0 /

300 0 -12

1,000 0 -6

2,000 4 -6

3,000 4 -6

3,400 4 -9

4,000 0 /

13 RLR 2 ± 3 dB

14 Receiving Response Frequency (Hz) Max.(dB) Min.(dB)

100 -12 /

200 0 /

300 2 -7

500 * -5

1,000 0 -5

3,000 2 -5

3,400 2 -10

4,000 2 /

* Mean that Adopt a straight line in between 300Hz& 1,000Hz

to be Max. level in the range.

15 STMR 13 ± 5 dB

16 Stability Margin > 6 dB

17 Distortion dB to ARL (dB) Level Ratio (dB)

-35 17.5

-30 22.5

-20 30.7

-10 33.3

0 33.7

7 31.7

10 25.5

18 Sidetone Distortion Three stage distortion < 10%

<Change> System frequency

≤2.5ppm

(13MHz) tolerance

20 <Change>32.768KHz ≤30ppm

tolerance

- 6 -

Item Description Specification

21 Power consumption Full power: < 390mA (GSM) ; < 320mA (DCS)

Standby : 1. Normal ’≤5mA(Mix. power)

2. Using Test mode on DSP Sleep function ≤6mA

22 Talk time GSM/ Level_7 (Battery Capacity 650mA): 130Min

GSM/ Level_7 (Battery Capacity 600mA): 120Min

23 Standby time Under conditions, at least 85 hours:

1. Brand new and full 600mAh battery

2. Full charge, no receive/send and keep GSM in idle mode.

3. Broadcast set off.

4. Signal strength display set at 3 level above.

5. Backlight of phone set off.

24 Ringer Volume At least 70dB under below conditions:

1. Ringer set as ringer 7.

2. Test distance set as 50 cm

25 Charge Voltage Fast Charge: < 600 mA

Slow Charge: < 100 mA

26 Antenna display GSM DCS

≥-84dBm -80dBm : 4

≥-89dBm -85dBm : 3

≥-94dBm -90dBm : 2

≥-101dBm -97dBm : 1

≥-105dBm -101dBm : 0

Tolerance: ± 2 dB

27 Battery indicator Level Voltage (v)

0V≤3.5V

1 3.5 ≤V ≤3.7

2 3.7 ≤V ≤3.8

3 3.8 ≤V ≤4.0

4 4.0 ≤V

Tolerance: ± 0.1V

28 Low Voltage Warning 3.5V ± 0.1V

29 Forced shut down Voltage 3.3V ± 0.1V

30 Battery Type 1 Li-Ion battery

Standard Voltage = 3.7V

Battery full charge voltage =4.2V

Capacity: 650mAh/600mAh (Li-Ion);

31 Travel Charger Linear Charger

In put: 110V or 240 VAC, 50/60Hz

Out put: 5VDC ± 0.25V, 500mA (No Load)

Switching-mode charger

In put: 96- 246VAC, 50/60Hz

Out put: 5VDC ± 0.25V, 500mA (No Load)

1. PERFORMANCE

- 7 -

1-4. GSM band RF Specifications

Frequency Stability < ± 90Hz

RF Maximum Power Output 33dBm

RF Output Power Levels 15, decrementing in 2dB steps

Power Control Level 5 33dBm ± 2dB

Power Control Level 6 31dBm ± 3dB

Power Control Level 7 29dBm ± 3dB

Power Control Level 8 27dBm ± 3dB

Power Control Level 9 25dBm ± 3dB

Power Control Level 10 23dBm ± 3dB

Power Control Level 11 21dBm ± 3dB

Power Control Level 12 19dBm ± 3dB

Power Control Level 13 17dBm ± 3dB

Power Control Level 14 15dBm ± 3dB

Power Control Level 15 13dBm ± 3dB

Power Control Level 16 11dBm ± 5dB

Power Control Level 17 9dBm ± 5dB

Power Control Level 18 7dBm ± 5dB

Power Control Level 19 5dBm ± 5dB

TX Frequency Output

Low Channel (Ch 1) 890.2 MHz

Mid Channel (Ch 62) 902.4 MHz

High Channel (Ch 124) 914.8 MHz

TX Frequency Calculation (Ftx) 890 + (ARFCN x 0.2) = Ftx MHz

TX UHF VCO Frequency

Low Channel (Ch 1) 1160.2 MHz

Mid Channel (Ch 62) 1172.4 MHz

High Channel (Ch 124) 1184.8 MHz

TX UHF VCO Freq. Calculation (Ftuhf) Ftx + 270 = Ftuhf MHz

IF VCO Frequency 540 MHz

TX IF Frequency 270 MHz

Rx IF Frequency 270MHz

Phase Error

Peak Phase Error < 20 degrees

RMS Phase Error < 5 degrees

- 8 -

1-5. DCS band RF Specifications

Frequency Stability < ± 180Hz

RF Maximum Power Output 30dBm

RF Output Power Levels 16, decrementing in 2dB steps

Power Control Level 0 30dBm ± 2dB

Power Control Level 1 28dBm ± 3dB

Power Control Level 2 26dBm ± 3dB

Power Control Level 3 24dBm ± 3dB

Power Control Level 4 22dBm ± 3dB

Power Control Level 5 20dBm ± 3dB

Power Control Level 6 18dBm ± 3dB

Power Control Level 7 16dBm ± 3dB

Power Control Level 8 14dBm ± 4dB

Power Control Level 9 12dBm ± 4dB

Power Control Level 10 10dBm ± 4dB

Power Control Level 11 8dBm ± 4dB

Power Control Level 12 6dBm ± 4dB

Power Control Level 13 4dBm ± 4dB

Power Control Level 14 2dBm ± 5dB

Power Control Level 15 0dBm ± 5dB

TX Frequency Output

Low Channel (Ch 512) 1710.2 MHz

Mid Channel (Ch 699) 1747.6 MHz

High Channel (Ch 885) 1784.8 MHz

TX Frequency Calculation (Ftx) 1710.2 + (ARFCN x 0.2) = Ftx MHz

TX UHF VCO Frequency

Low Channel (Ch 1) 1530.2 MHz

Mid Channel (Ch 62) 1567.6 MHz

High Channel (Ch 124) 1604.8 MHz

TX UHF VCO Freq. Calculation (Ftuhf)Ftx + 180 = Ftuhf MHz

IF VCO Frequency 540 MHz

TX IF Frequency 180 MHz

Rx IF Frequency 270MHz

Phase Error

Peak Phase Error < 20 degrees

RMS Phase Error < 5 degrees

1. PERFORMANCE

- 9 -

1-6. Receiver (GSM)

1-7. Receiver (DCS)

RX Frequency Input

Low Channel (Ch 1) 935.2 MHz

Mid Channel (Ch 62) 947.4 MHz

High Channel (Ch 124) 959.8 MHz

RX Frequency Calculation (Frx) 935 + (ARFCN x 0.2) = Frx MHz

RX UHF VCO Frequency

Low Channel (Ch 1) 1160-1230 MHz

Mid Channel (Ch 62) 1205.2 MHz

High Channel (Ch 124) 1217.4 MHz

RX UHF VCO Freq. Calculation 1229.8 MHz

(Fruhf)F

rx + 270 = Fruhf MHz

RX VCO Frequency 540 MHz

Demodulation Frequency 270 MHz (540/ 2)

IF Frequency 270 MHz

BER (Bit Error Ratio) Type II BER <2.4% at -102dBm

Type II BER <0.1% at -15dBm

RX Frequency Input

Low Channel (Ch 1) 1805.2 MHz

Mid Channel (Ch 62) 1842.6 MHz

High Channel (Ch 124) 1879.8 MHz

RX Frequency Calculation (Frx) Ftx + 95 Mhz = Frx MHz

1535-1610 MHz

RX UHF VCO Frequency

Low Channel (Ch 1) 1535.2MHz

Mid Channel (Ch 62) 1572.6 MHz

High Channel (Ch 124) 1609.8 MHz

RX UHF VCO Freq. Calculation (Fruhf)Frx - 270 = Fruhf MHz

RX VCO Frequency 540 MHz

Demodulation Frequency 270 MHz (540/ 2)

IF Frequency 270 MHz

BER (Bit Error Ratio) Type II BER <2.4% at -102dBm

Type II BER <0.1% at -15dBm

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