D820_sm.pdf

GSM TELEPHONE

SGH-D820

JVP WHOHSKRQH

FRQWHQWV

1. Specification

2. Circuit Description

3. Exploded Views and Parts List

4. Electrical Parts List

5. Block Diagrams

6. PCB Diagrams

7. Flow Chart of Troubleshooting

This Service Manual is a property of Samsung Electronics Co.,Ltd.

Any unauthorized use of Manual can be punished under applicable

International and/or domestic law.

ⓒ

Samsung Electronics Co.,Ltd. March. 2006

Printed in Korea.

Code No.: GH68-09648A

BASIC.

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1-1. GSM General Specification

GSM850

GSM900

Phase 1

EGSM 900

Phase 2

DCS1800

Phase 1

PCS1900

Freq.

Band[MHz]

Uplink/Downlink

824~849

869~864

890~915

935~960

880~915

925~960

1710~1785

1805~1880

1850~1910

1930~1990

ARFCN range 128~251

1~124

0~124 &

975~1023

512~885

512~810

Tx/Rx spacing

45MHz

95MHz

80MHz

Mod. Bit rate

/BitPeriod

270.833kbps

3.692us

270.833kbps

3.692us

270.833kbps

3.692us

270.833kbps

3.692us

270.833kbps

3.692us

Time Slot

Period

/ Frame Period

576.9us

4.615ms

576.9us

4.615ms

576.9us

4.615ms

576.9us

4.615ms

576.9us

4.615ms

Modulation

0.3GMSK 0.3GMSK 0.3GMSK 0.3GMSK 0.3GMSK

MS Power 33dBm~5dBm 33dBm~5dBm 33dBm~5dBm 30dBm~0dBm 30dBm~0dBm

Power Class 5pcl ~ 19pcl 5pcl ~ 19pcl 5pcl ~ 19pcl 0pcl ~ 15pcl 0pcl ~ 15pcl

Sensitivity

-102dBm -102dBm -102dBm -100dBm -100dBm

TDMA Mux

Cell Radius

35Km

2Km

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1-2. GSM TX power class

TX Power

control

level

GSM850

TX Power

control

level

GSM900

TX Power

control

level

DCS1800

TX Power

control

level

PCS1900

33±3 dBm

30±3 dBm

31±3 dBm

28±3 dBm

29±3 dBm

26±3 dBm

27±3 dBm

24±3 dBm

25±3 dBm

22±3 dBm

23±3 dBm

20±3 dBm

21±3 dBm

18±3 dBm

19±3 dBm

16±3 dBm

17±3 dBm

14±3 dBm

15±3 dBm

12±4 dBm

13±3 dBm

10±4 dBm

11±5 dBm

8±4dBm

9±5 dBm

6±4 dBm

7±5 dBm

4±4 dBm

5±5 dBm

2±5 dBm

0±5 dBm

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2. Circuit Description

2-1. SGH-D820 RF Circuit Description

2-1-1. RX PART

- FRONT END MODULE(ANTENNA SWITCH MODULE + RX SAW FILTER) (F101)

It performs to switch Tx & Rx paths for GSM850, GSM900, DCS1800 and PCS1900 with logic controls below.

- FEM Control Logic Table

FESW1

FESW2

Tx Mode (GSM850/900)

Tx Mode (DCS1800/1900)

Rx Mode (GSM900/850)

Rx Mode (DCS1800)

Rx Mode (PCS1900)

- VC-TCXO (TCX100)

This module generates the 26MHz reference clock to drive the logic and RF systems.

It is turned on when the supply voltage (+VCC_SYN) is applied.

After buffering, the 26MHz reference clock is supplied to the other parts of the system through the transceiver pin

CLKOUT.

- Transceiver (U102)

This chip is fully integrated GSM & GPRS quad-band transceiver with RF VCO, loop filters and most of the

passive components required in it.

It also fully integrated fractional N RF synthesizer with AFC control possibility, RF VCO with integrated supply

regulator. Semi integrated reference oscillator with integrated supply regulator.

RF Receiver front-end amplifies the E-GSM900(GSM850), DCS1800 and PCS1900 aerial signal, convert the chosen

channel down to a low IF of 100kHz.

In IF section, further amplifies the wanted channel, performs gain control to tune the output level to the desired value and

rejects DC.

2-1-2. TX PART

The transmitter is fully differential using a direct up conversion architecture. It consists of a signal side band

power up mixer. Gain is controlled by 6 dB via 3-wire serial bus programing. The fully integrated VCO and power

mixer achieve LO suppression, quadrature phase error, quadrature amplitude balance and low noise floor specification.

Output matching/balun components drive a standard 50 ohms single ended load.

2-1

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