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PORTABLE CELLULAR
TELEPHONE
SCH-2500 Series
SERVICE Manual
PORTABLE CELLULAR TELEPHONE CONTENTS
1. General Introduction
2. Specification
3. Installation
4. Nam Programming
5. Circuit Description
6. Trouble shooting
7. Exploded Views and its Parts List
8. Electrical Parts List
9. PCB Diagrams
10. Block Diagrams
11. Circuit Diagram
SAMSUNG Proprietary - Contents may change without notice
Samsung Electronics Co.,Ltd.
GH68-00621A
1999. 9. Rev. 1.0
1. General Introduction
The SCH-25XX DBTM phone functions as analog phone working in AMPS (Advanced Mobile Phone Service)
mode, digital cellular phone working in CDMA (Code Division Multiple Access) mode, and digital phone
working in PCS (Personal Communication Service) mode.
The following standards and minimum performance standards shall be met or exceeded by each subscriber
unit.
Air Interface
The Subscriber Unit shall be Triple mode and Dual band in compliance with ANSI J-STD-008 and TIA/EIA IS-
98A.
MS(Mobile Station) meets the specifications of the below;
ANSl J-STD-008 : Personal Station-base Station Compatibility Requirements for 1.8 to 2.0 GHz CDMA
PCS.
ANSl J-STD-018 : Recommended Minimum Performance Requirements for 1.8 to 2.0 GHz CDMA Personal
Stations.
CDG Ref. Document #27 : High Rate Speech Service Option for Wideband Spread Spectrum Systems.
TlA/ElA lS-95A : Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread
Spectrum Cellular System.
IS-96A : Speech Service Option 1 Standard for Dual-Mode Wideband Spread-Spectrum Cellular Syatems.
IS-98A : Standard for Dual-Mode Wideband Spread Spectrum Cellular Mobile Station.
IS-126 : Mobile Station Loopback Service Options Standard.
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 1-1
General Introduction
Memo
1-2 SAMSUNG Proprietary - Contents may change without notice
2. SPECIFICATION
2-1. General
ITEM PCS CDMA AMPS
Tx Freq. range 1850 ~ 1910MHz 824 ~ 849MHz 824~849MHz
Rx Freq. range 1930 ~1990MHz 869 ~894MHz 869 ~894MHz
Channel Bandwidth 1.23 MHz 1.23 MHz 30 KHz
Channel Spacing 50 KHz 30 KHz 30 KHz
Number of Channel 1200 20FA 832
Duplex Separation 80 MHz 45 MHz 45 MHz
Type of Emission 1M25F9W 40K0F8W,40K0F1D 40K0F8W,40K0F1D
In/Output Impedance 50 50 50
Tx Intermediate Freq. 130.38MHz 130.38MHz 130.38MHz
Rx Intermediate Freq. 210.38MHz 85.38MHz 85.38MHz
Tx Local Freq. lst(FTX-130.38MHz) lst(FTX+130.38MHz) lst(FTX+130.38MHz)
2nd(260.76MHz) 2nd(260.76MHz) 2nd(260.76MHz)
Rx Local Freq lst(FRX-210.38MHz) lst(FRX+85.38MHz) lst(FRX+85.38MHz)
2nd(420.76MHz) 2nd(170.76MHz) 2nd(170.76MHz)
TCXO freq 19.68MHz 19.68MHz 19.68MHz
Freq. Stability (FRX-80MHz)