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Samsung SCH-570 Service Manual

Cdma portable cellular telephone
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SERVICE
CDMA Portable Cellular Telephone
CDMA Portable
Cellular Telephone
SCH-570
Manual
3. NAM Pro g r a m m i n g
4. Data Tr a n s f e r
9. Test Command T a b l e
CONTENTS

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Summary of Contents for Samsung SCH-570

  • Page 1: Table Of Contents

    CDMA Portable Cellular Telephone SCH-570 SERVICE Manual CONTENTS CDMA Portable Cellular Telephone 1. General Intro d u c t i o n 2. Specification 3. NAM Pro g r a m m i n g 4. Data Tr a n s f e r 5.
  • Page 2 Samsung Electronics Co.,Ltd. SEP. 1998. Printed in Korea Code No. : GH68-60724A HONGKONG CHINA.

  • Page 3: General Introduction

    1. General Introduction The SCH-570 cellular phone functions as only digital cellular phone working in CDMA (Code Division Multiple Access) mode. CDMA type digital mode applies DSSS (Direct Sequential Spread spectrum) mode which first came to be used in the military.
  • Page 4 1.1 General Frequency Range Transmitter : 824.64 ~ 848.37 MHz Receiver : 869.64 ~ 893.37 MHz Channel Spacing : 1.23 MHz Number of Channels : 20 FA Duplex Spacing : 45 MHz MSC Transmitter Frequency FA NO. CH. NO. CENTER FREQUENCY FA NO.

  • Page 5: Specification

    2. Specification Frequency Range Transmitter : 824.64 MHz ~ 848.37MHz Frequency Range Receiver : 869.64 MHz ~ 893.37 MHz Waveform Quality : above 0.944 Time Reference : within RX Sensitivity 104 dBm, FER = within 0.5% Dynamic Range 104 dBm ~ 25 dBm, FER = within 0.5% TX Output Power : Maximum 320 mW (25dBm)

  • Page 6: Circuit Description

    5. Circuit Description 5-1 Logic Section 5-1-1 Power Supply FLASH ROM With the battery installed on the phone and by pressing the END/ key, the VBATT and ON_SW signals will be connected. This will turn One 8 MBIT FROM is used to store the terminal's on U123 DC_DC convertor.
  • Page 7 5-1-3 Baseband Part MOBILE STATION MODEM (MSM) The MSM equipped with the INTEL 80186 CPU ADC Interface core is an important component of the CDMA cellular phone. The MSM comes in a 176 pins ADC_CLK (pin 3), ADC_ENABLE (pin 1) and TQFP package.
  • Page 8 5-1-4 Audio Part BUZZER DRIVING CIRCUITRY TX AUDIO PATH Buzzer generates alert tone when the buzzer The voice signal output from microphone is receives the timer signal from the MSM, it filtered and amplified by the internal OP-AMP generates alert tone. The buzzer level is adjusted and is converted to PCM data by the CODEC by the alert signal’s period generated from the (U117).

  • Page 9: Receiver Section

    5-2 Receiver Section LOW NOISE AMPLIFIER (LNA, Q302) IF SAW BAND PASS FILTER (FOR CDMA) The low noise amplifier amplifies a weak signal IF SAW BPF (F303) is used for CDMA system received from the base station to obtain the having 1.23 MHz wideband and 630 kHz optimum level (Noise figure = 1.5 dB,...
  • Page 10 VOLTAGE CONTROLLED OSCILLATOR (VCO, DUPLEXER (F301) U341) Duplexer (F301) controls to transmit through the The VCO (U341) generates the signal having 966 antenna only the signals within acceptable Tx frequency range (836 12.5 MHz) and to receive MHz center frequency and 12.5 MHz deviation through the antenna only the signals within with the voltage control.

  • Page 11: Transmitter Section

    5-3 Transmitter Section RF BAND PASS FILTER (BPF, F451) BBA (U401) The RF BPF ( F451) accepts only a specific BBA (U401) consists of ADC, DAC, LPF (CDMA), frequency (836 12.5MHz) to send it out to the divider, VCO, logic control circuit, PLL, and mixer. base station.

  • Page 12: Exploded View And Its Parts List

    6. Exploded View and its Parts List 6-1 Fixed Phone Exploded View...
  • Page 13 6-2 Fixed Phone Parts List...
  • Page 14 6-3 Rapid Charger View SEC CODE : GH44 - 40100A...

  • Page 15: Pcb Diagrams

    7. PCB Diagrams 7-1 Cellular Phone 7-1-1 Main Board PCB: Top...
  • Page 16 7-1-2 Main Board PCB: Bottom...

  • Page 17: Electrical Parts List

    7-2 Electrical Parts List SEC CODE DESCRIPTION PART NO. REMARK 0401 - 001052 DIODE - SWITCHING D101 D109 0405 - 000107 DIODE - VARACTOR D401 D402 D403 D404 0407 - 000115 DIODE - ARRAY D103 D105 D106 0407 - 000122 DIODE - ARRAY D102 D104 0407 - 000127...
  • Page 18 SEC CODE DESCRIPTION PART NO. REMARK 1201 - 000103 IC - AUDIO AMP U111 1201 - 001006 IC - OP AMP U462 U463 1201 - 001090 IC - PREAMP U385 1201 - 001175 IC - PREAMP U464 1201 - 001176 IC - PREAMP U461 1201 - 001257...
  • Page 19 SEC CODE DESCRIPTION PART NO. REMARK 2007 - 000148 R - CHIP 10 K 1/16 W R180 R182 R184 R185 R473 2007 - 000148 R - CHIP 10 K 1/16 W R157 R159 R143 R144 R702 2007 - 000148 R - CHIP 10 K 1/16 W R460 R178 R137R414 R485 2007 - 000148 R - CHIP 10 K 1/16 W...
  • Page 20 SEC CODE DESCRIPTION PART NO. REMARK 2007 - 001217 R - CHIP 82 1/16 W R186 R187 2007 - 001244 R - CHIP 91 K 1/16 W R102 R175 2007 - 001288 R - CHIP 18 1/16 W R360 2007 - 001294 R - CHIP 36 1/16 W R191 R193 R194 R336 2007 - 001295...
  • Page 21 SEC CODE DESCRIPTION PART NO. REMARK 2203 - 000254 C - CHIP 10 nF C354 C355 C356 C358 C381 2203 - 000254 C - CHIP 10 nF C386 C333 C371 C394 C343 2203 - 000254 C - CHIP 10 nF C121 C349 C461 C403 C475 2203 - 000254 C - CHIP 10 nF...
  • Page 22 SEC CODE DESCRIPTION PART NO. REMARK 2203 - 000940 C - CHIP 470 PF CX002 CX103 2203 - 000941 C- CHIP 470 PF C149 2203 - 000995 C - CHIP 47 PF C463 C458 2203 - 001033 C - CHIP 5.6 nF C153 2203 - 001086 C - CHIP 5 PF...
  • Page 23 SEC CODE DESCRIPTION PART NO. REMARK 2703 - 000237 INDUCTOR 750 nH L403 2703 - 000261 INDUCTOR 390 nH L311 2703 - 000300 INDUCTOR 1 UH L455 L305 L314 L343 L346 2703 - 000300 INDUCTOR 1 UH L342 2703 - 000301 INDUCTOR 2.7 UH L312 L344 2703 - 001011...

  • Page 24: Troubleshooting

    8. Troubleshooting 8-1 Logic Section 8-1-1 No Power...
  • Page 25 8-1-2 Abnormal Initial Operation (Normal +3.3V voltage source)
  • Page 26 8-1-3 Abnormal Backlight Operation...
  • Page 27 8-1-4 Abnormal Key Data Input...
  • Page 28 8-1-5 Abnormal Keytone...
  • Page 29 8-1-6 Abnormal Alert Tone...
  • Page 30 8-2 RF Section 8-2-1 RF Secton Troubleshooting...
  • Page 31 8-2-2 Receiver Part...
  • Page 32 8-2-3 Transmitter Part...

  • Page 33: Block & Circuit Diagrams

    10. Block & Circuit Diagrams 10-1 Block Diagram...

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