Samsung SCH-2500 series User manual

SERVICE
PORTABLE CELLULAR
TELEPHONE
SCH-2500 Series
SAMSUNG Proprietary - Contents may change without notice
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 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.
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General Introduction
Memo

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 50Ω50Ω50Ω
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)±150Hz (FRX-45MHz)±300Hz ±2.5ppm
Operating Temperature -30 oC~ +60 oC-30 oC~ +60 oC-30 oC~ +60 oC
Supply Voltage +3.6V
Size and Weight STD : 122cm X 50cm X 26cm, 161 g, 1000 mA
MID : 122cm X 50cm X 30cm, 179 g, 1600 mA
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2-2. 1.9GHz CDMA(US PCS)
1) General
Frequency Range
.Transmitter : 1850-1910MHz
.Receiver : 1930-1990MHz
Channel Bandwidth : 1.23MHz
Channel Spacing : 50kHz
Number of Channels : 1200
Duplex Seperation : 80MHz
Type of Emission : 1M25F9W
Input/Output impedance : 50 Ω
Intermediate Frequency
.Transmitter : 130.38MHz
.Receiver : 210.38MHz
Local Frequency
.Transmitter : lst(FTX-130.38), 2nd(260.76MHz),
.Receiver : lst(FRX-210.38MHz), 2nd(420.76MHz),
TCXO Frequency : 19.68MHz
Frequlency Stability : (FTX-80MHz)±150Hz
Operation Temperature : -30 oC~ 60 oC
Supply Voltage : +3.6V
2) Transmitter
Waveform Quality : 0.944 or more
Open Loop Power Conterol Range
. -25dBm : -60.5dBm ~ -41.5dBm
. -65dBm : -20.5dBm ~ +1.5dBm
. -104dBm : +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
Specification

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Specification
3) Receiver
Rx Sensitivity and Dynamic Range : -104dBm, FER=0.5% or less
: -25dBm, FER=0.5% or less
Conducted Spurious Emission
. 1930 ~ 1990MHz : <-81dBm
. 1850 ~ 1910MHz : <-61dBm
. All Other Frequencies : <-47dBm
Single Tone Desensitization : lower than 1%
Rx power = -101dBm
Tone power = -30dBm
Tone offset from carrier = ±1.25MHz
Intermodulation Spurious Response Attenuation : lower than 1%
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

Specification
2-3 800MHz CDMA
1) General
Frequency Range
.Transmitter : 824 ~849MHz
.Receiver : 869 ~894MHz
Channel Bandwidth : 1.23MHz
Channel Spacing : 30kHz
Number of Channels : 20FA
Duplex Seperation : 45 MHz
Type of Emission : 40KOF8W, 40KOF1D
Input/Output Impedance : 50Ω
Intermediate Frequency
.Transmitter : 130.38MHz
.Receiver : 85.38MHz
Local Frequency
.Transmitter : lst(FTX-130.38MHz),2nd(260.76MHz)
.Receiver : lst(FTX-85.38MHz),2nd(170.76MHz)
TCXO Frequency : 19.68MHz
Frequency Stability : (FTX-45MHz)±300Hz
Operation Temperature : -30 oC~ 60 oC
Supply Voltage : +3.6V
2) Transmitter
Waveform Quality : 0.944 or more
Open Loop power Control Range
. -25dBm : -57.5dBm ~ -38.5dBm
. -65dBm : -17.5dBm ~ +1.5dBm
. -104dBm : +18.0dBm ~ +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 @900 KHz : -42dBc/30kHz
@1.25MHz : -54dBc/30kHz
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Specification
3) Receiver
Rx Sensitivity and Dynamic Range : -104dBm, FER=0.5% or less
: -25dBm, FER=0.5% or less
Conducted Spurious Emission
.869 ~ 894 MHz : <-81dBm
.824 ~ 849 MHz : <-61dBm
.A11 Other Frequencies : <-47dBm
Single Tone Desenstization :lower than 1%
Rx power level = -101dBm
Tone power level = -30dBm
Tone offset from carrier = ± 900kHz
Intermodulation Spurious Response Attenuation : 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
2-5
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Specification
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2-4 800MHZ CELLULAR(AMPS)
1) General
Frequency Range
.Transmitter : 824 ~ 849MHz
.Receiver : 869 ~ 894MHz
Channel Spacing : 30kHz
Number of Channels : 832
Duplex Seperation : 45MHz
Frequency Stability : ±2.5ppm(-30 oC~ 60 oC, -22°F ~ 140°F)
Modulation/Demodulation
.Voice : PM
.Data : FM
Operating Temperature : -30oC~ 60oC, -22°F ~ 140°F
Supply Voltate : +3.6V
2) Transmitter
RF output power : 0.6W(+2/-4dB)
Carrier ON/OFF conditions
“ON” Condition : within ±3dB of specification output (in 2 ms)
“OFF” Condition : below -60dBm (in 2 ms)
Compresssor
Compression Rate : 2 : 1
Attack Time : 3ms
Recovery Time : 13.5ms
Reference Input : input power level for producing a nominal ±2.9kHz
: 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%)