Samsung SCH-2500 series Service Manual
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Samsung SCH-2500 series Service Manual

Samsung SCH-2500 series Service Manual

Portable cellular telephone
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Download this manual See also: Owner's Manual
SERVICE
PORTABLE CELLULAR TELEPHONE
SAMSUNG Proprietary - Contents may change without notice
PORTABLE CELLULAR
TELEPHONE
SCH-2500 Series
Manual
CONTENTS
1.
2.
3.
Installation
4.
Nam Programming
5.
Circuit Description
6.
7.
Exploded Views and its Parts List
8.
Electrical Parts List
9.
10. Block Diagrams

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Table of Contents
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Summary of Contents for Samsung SCH-2500 series

  • Page 1: Table Of Contents

    Manual PORTABLE CELLULAR TELEPHONE CONTENTS General Introduction Specification Installation Nam Programming Circuit Description Trouble shooting Exploded Views and its Parts List Electrical Parts List PCB Diagrams 10. Block Diagrams 11. Circuit Diagram SAMSUNG Proprietary - Contents may change without notice...
  • Page 2 Samsung Electronics Co.,Ltd. GH68-00621A 1999. 9. Rev. 1.0...

  • Page 3: General Introduction

    SCH-25XX is composed of main handset, rapid charger, cradle, two batteries (1000 mAh, 1600 mAh), hand- free kit, and travel charger. Hands-free Kit is designed to be operated in full-duplex mode taking turn-around delay between the phone and the system into account. SAMSUNG Proprietary - Contents may change without notice...
  • Page 4 General Introduction Memo SAMSUNG Proprietary - Contents may change without notice...

  • Page 5: Specification

    C ~ +60 C ~ +60 Operating Temperature Supply Voltage +3.6V Size and Weight : 122cm X 50cm X 26cm, 161 g, 1000 mA : 122cm X 50cm X 30cm, 179 g, 1600 mA SAMSUNG Proprietary - Contents may change without notice...
  • Page 6 : +15.0dBm ~ +30dBm Minimum Tx Power control : below -50dBm Closed Loop Power Control Range : ±24dB Maximum RF Output Power : 200mW(+23dBm) Occupied Bandwidth : 1.23MHz Conducted Spurious Emission @ 1.25MHz : -42dBc/30kHz SAMSUNG Proprietary - Contents may change without notice...
  • Page 7 Rx power = -101dBm Tone 1 power = -43dBm Tone 2 power = -43dBm Tone 1 : offset from carrier = ± 1.25MHz Tone 2 : offset from carrier = ± 2.05MHz SAMSUNG Proprietary - Contents may change without notice...
  • Page 8 Minimum Tx Power Control : below -50dBm Closed Loop Power Control Range : ±24dB Maximum RF Output Power : 200mW(+23dBm) Occupied Bandwidth : 1.23MHz Conducted Spurious Emission @900 KHz : -42dBc/30kHz @1.25MHz : -54dBc/30kHz SAMSUNG Proprietary - Contents may change without notice...
  • Page 9 : lower than 1% Rx power = -101dBm Tone 1 power = -43dBm Tone 2 power = -43dBm Tone 1 offset from carrier = ± 900kHz Tone 2 offset from carrier = ± 1,700kHz SAMSUNG Proprietary - Contents may change without notice...
  • Page 10 : peak frequency deviation of transmitted carrier Preamphasis : 6dB/oct within 0.3 ~ 3kHz Maximum Frequency Deviation F3 of G3 : ±12kHz Supervisory Audio Tone : ± 2kHz(±10%) Signling Tone : ± 8kHz(±10%) Wideband Data : ± 8kHz(±10%) SAMSUNG Proprietary - Contents may change without notice...
  • Page 11 ±2.9 kHz peak frequency deviation Sensitivity : 12 dB SINAD/-116dBm Intermodulation Spurious Response Attenuation : above 65dB RSSI Range : avoce 60dB Protection Against Spurious Response Interference : above 60dB SAMSUNG Proprietary - Contents may change without notice...
  • Page 12 70 ~ 130MHz : -41dBm 130 ~ 174 MHz : -41 ~ -32dBm 174 ~ 260 MHz : -32dBm 260 ~ 470 MHz : -32 ~-26dBm 470 ~ 1G MHz : -21dBm SAMSUNG Proprietary - Contents may change without notice...
  • Page 13 TV : Tx vocoder rate (8 is full rate, 1 is 1/8th rate) RV : Rx vocoder rate (8 is full rate, 1 is 1/8th rate) xx : Walsh code used in traffic channel System acquisition state SAMSUNG Proprietary - Contents may change without notice...
  • Page 14 TEX : Tx vocoder rate (8 is full rate, 1 is 1/8th rate) T-xx Dxxx REX : Rx vocoder rate (8 is full rate, 1 is 1/8th rate) Pxxx CCHxxxx xx : Walsh code used in traffic channel 2-10 SAMSUNG Proprietary - Contents may change without notice...
  • Page 15 5 - Waiting for answer 2 - Idle state 6 - Conversation 3 - Vocoder - Init 7 - Release 4 - Waiting for order 8 - System acguisition System acguisition state SAMSUNG Proprietary - Contents may change without notice 2-11...
  • Page 16 Specification Memo 2-12 SAMSUNG Proprietary - Contents may change without notice...

  • Page 17: Trouble Shooting

    6. Trouble shooting. 6-1. Logic Section 6-1-1 No Power SAMSUNG Proprietary - Contents may change without notice...
  • Page 18 Troulde-shooting 6-1-2 Abnormal initial operation (Normal +3.6V voltage source) SAMSUNG Proprietary - Contents may change without notice...
  • Page 19 Troulde-shooting 6-1-3 Abnormal Backlight Operation SAMSUNG Proprietary - Contents may change without notice...
  • Page 20 Troulde-shooting 6-1-4 Abnormal Key Data Input SAMSUNG Proprietary - Contents may change without notice...
  • Page 21 Troulde-shooting 6-1-5 Abnormal Keytone SAMSUNG Proprietary - Contents may change without notice...
  • Page 22 Troulde-shooting 6-1-6 Abnormal Alert Tone SAMSUNG Proprietary - Contents may change without notice...
  • Page 23 Troulde-shooting 6-2 Receiver Section 6-2-1 PCS SAMSUNG Proprietary - Contents may change without notice...
  • Page 24 Troulde-shooting 6-2-2 CDMA SAMSUNG Proprietary - Contents may change without notice...
  • Page 25 Troulde-shooting 6-2-3 FM SAMSUNG Proprietary - Contents may change without notice...
  • Page 26 Troulde-shooting 6-3 Transmitter Section 6-3-1 PCS 6-10 SAMSUNG Proprietary - Contents may change without notice...
  • Page 27 Troulde-shooting 6-3.2 CDMA/ AMPS Mode SAMSUNG Proprietary - Contents may change without notice 6-11...
  • Page 28 Troulde-shooting Memo 6-12 SAMSUNG Proprietary - Contents may change without notice...

  • Page 29: Pcb Diagrams

    9. PCB Diagrams 9-1 Cellular Phone PCB 9-2 Desk-Top Rapid Charger PCB 9-3 Hands-Free kit PCB 9-4 Cradle PCB 9-5 Car Adapter PCB 9-6 Rapid Travel Charger PCB SAMSUNG Proprietary - Contents may change without notice...

  • Page 30: Cellular Phone Pcb

    Circuit Diagram 9-1 Cellular Phone PCB 9-1-1 SAMSUNG Proprietary - Contents may change without notice...
  • Page 31 Circuit Diagram Circuit Diagram 9-1-2 SAMSUNG Proprietary - Contents may change without notice...
  • Page 32 PCB Diagrams 9-1-3 SAMSUNG Proprietary - Contents may change without notice...
  • Page 33 PCB Diagrams 9-1-4 SAMSUNG Proprietary - Contents may change without notice...

  • Page 34: Desk-Top Rapid Charger Pcb

    PCB Diagrams 9-2 Desk-Top rapid Charger PCB 9-2-1 SAMSUNG Proprietary - Contents may change without notice...
  • Page 35 PCB Diagrams 9-2-2 SAMSUNG Proprietary - Contents may change without notice...

  • Page 36: Hands-Free Kit Pcb

    PCB Diagrams 9-3 Hands-Free kit PCB 9-3-1 SAMSUNG Proprietary - Contents may change without notice...
  • Page 37 PCB Diagrams 9-3-2 SAMSUNG Proprietary - Contents may change without notice...
  • Page 38 PCB Diagrams 9-4 Cradle PCB SAMSUNG Proprietary - Contents may change without notice 9-10...

  • Page 39: Car Adapter Pcb

    PCB Diagrams 9-5 Car Adapter PCB 9-5-1 9-11 SAMSUNG Proprietary - Contents may change without notice...
  • Page 40 PCB Diagrams 9-5-2 9-12 SAMSUNG Proprietary - Contents may change without notice...

  • Page 41: Rapid Travel Charger Pcb

    PCB Diagrams 9-6 Rapid Travel Charger PCB 9-6-1 9-13 SAMSUNG Proprietary - Contents may change without notice...
  • Page 42 PCB Diagrams 9-6-2 9-14 SAMSUNG Proprietary - Contents may change without notice...

  • Page 43: Circuit Diagram

    11. Circuit Diagram 11-1 Main Circuit Diagram 11-2 Desk-Top Rapid Charger Circuit Diagram 11-3 Hands-Free Kit Circuit Diagram 11-4 Cradle Circuit Diagram 11-5 Car Adapter Circuit Diagram 11-6 Rapid Travel Charger Circuit Diagram 11-1 SAMSUNG Proprietary - Contents may change without notice...

  • Page 44: Main Circuit Diagram

    Circuit Diagram 11-1 Main Circuit Diagram 11-1-1 SAMSUNG Proprietary - Contents may change without notice 11-2...
  • Page 45 Circuit Diagram 11-1-2 SAMSUNG Proprietary - Contents may change without notice 11-3...
  • Page 46 Circuit Diagram 11-1-3 SAMSUNG Proprietary - Contents may change without notice 11-4...
  • Page 47 Circuit Diagram 11-1-4 SAMSUNG Proprietary - Contents may change without notice 11-5...
  • Page 48 Circuit Diagram 11-1-5 SAMSUNG Proprietary - Contents may change without notice 11-6...
  • Page 49 Circuit Diagram 11-1-6 11-7 SAMSUNG Proprietary - Contents may change without notice...

  • Page 50: Desk-Top Rapid Charger Circuit Diagram

    Circuit Diagram 11-2 Desk-Top rapid Charger Circuit Diagram SAMSUNG Proprietary - Contents may change without notice 11-8...
  • Page 51 Circuit Diagram 11-3 Hands-Free Kit Circuit Diagram(1/2) SAMSUNG Proprietary - Contents may change without notice 11-9...
  • Page 52 Circuit Diagram Hands-Free Kit Circuit Diagram(2/2) SAMSUNG Proprietary - Contents may change without notice 11-10...

  • Page 53: Cradle Circuit Diagram

    Circuit Diagram 11-4 Cradle Circuit Diagram SAMSUNG Proprietary - Contents may change without notice 11-11...

  • Page 54: Car Adapter Circuit Diagram

    Circuit Diagram 11-5 Car Adapter Circuit Diagram SAMSUNG Proprietary - Contents may change without notice 11-12...

  • Page 55: Rapid Travel Charger Circuit Diagram

    Circuit Diagram 11-6 Rapid Travel Charger Circuit Diagram 11-13 SAMSUNG Proprietary - Contents may change without notice...

Table of Contents