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.
Samsung Electronics Co.,Ltd. GH68-00621A 1999. 9. Rev. 1.
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 IS98A.
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 50Ω 50Ω 50Ω Tx Intermediate Freq. 130.38MHz 130.38MHz 130.38MHz Rx Intermediate Freq.
Specification 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.
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.
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.
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 .
Specification 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 o o : ±2.5ppm(-30 C ~ 60 C, -22°F ~ 140°F) Modulation/Demodulation .Voice : PM .Data : FM Operating Temperature : -30 C ~ 60 C, -22°F ~ 140°F Supply Voltate : +3.6V o o 2) Transmitter RF output power : 0.
Specification Post Deviation Limiter Filter 3.0 ~ 5.9 kHz : above 40 LOG(F/3000)dB 5.9 ~6.1 kHz : above 35dB 6.
Specification In Band Conducted Spurious Emission Transmit Band : below -60dBm Receive Band : below -80dBm Out of Band Conducted Spurious Emissions : below -47dBm Radiated Spurious Emission 2-8 Frequency Range : Maximum Allowable EIRP 25 ~ 70MHz : -45dBm 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
Specification 2-5 PCS Debug Display Information To select debug display mode : prgss [MENU] + [8] and press [0] + [0] +[0] +[0] +[0] +[0] and press [1] or OK IN IDLE MODE Sxxxxx : SID (System Identification) toggle Nxxxxx : NID (Network Identification) toggle Slx : Slot cycle index (lowest between the system and the phone will be used) SIDxxxxx SIx T-xx Dxxx Pxxx xx x 1. SIO : Slot Index 0 -xx 2. SI1 : Slot Index 1 3.
Specification 2-6 CDMA Debug Display Information (menu 8) To select debug display mode : prgss [MENU] + [8] and press [0] + [0] +[0] +[0] +[0] +[0] and press [1] or OK IN IDLE MODE Sxxxxx : SID (System Identification) toggle Nxxxxx : NID (Network Identification) toggle Slx : Slot cycle index (lowest between the system and the phone will be used) Handset Status SIDxxxxx SIx T-xx Pxxx Dxxx x -xx CCHxxxx IN CONVERSATION MODE 0 - NO SVC 7 - Release 1 - Synchronization(Init) 8 - Overhead 2 - Paging (I
Specification 2-7 AMPS Debug Display Information To select debug display mode : prss [MENU] + [8] and press [0] + [0] +[0] +[0] +[0] +[0] and press [1] or OK SIDxxxxx : AMPS Home System ID PWRx : Power Level 0 ~ 7 SIDxxxxx x x SATx : Supervisory Audio Tone code (0 ~ 3) PWRx RSSIxxx x (Using Frequency Band) : A Band or B Band SATx ACHxxxx RSSIxxx : RSSI value xx xx CHxxx : Using Channel Handset Status : 1 - Initialization state 5 - Waiting for answer 2 - Idle state 6 - Conversation 3 - Voco
Specification Memo 2-12 SAMSUNG Proprietary - Contents may change without notice
6. Trouble shooting. 6-1.
Troulde-shooting 6-1-2 Abnormal initial operation (Normal +3.
Troulde-shooting 6-1-3 Abnormal Backlight Operation SAMSUNG Proprietary - Contents may change without notice 6-3
Troulde-shooting 6-1-4 Abnormal Key Data Input 6-4 SAMSUNG Proprietary - Contents may change without notice
Troulde-shooting 6-1-5 Abnormal Keytone SAMSUNG Proprietary - Contents may change without notice 6-5
Troulde-shooting 6-1-6 Abnormal Alert Tone 6-6 SAMSUNG Proprietary - Contents may change without notice
Troulde-shooting 6-2 Receiver Section 6-2-1 PCS SAMSUNG Proprietary - Contents may change without notice 6-7
Troulde-shooting 6-2-2 CDMA 6-8 SAMSUNG Proprietary - Contents may change without notice
Troulde-shooting 6-2-3 FM SAMSUNG Proprietary - Contents may change without notice 6-9
Troulde-shooting 6-3 Transmitter Section 6-3-1 PCS 6-10 SAMSUNG Proprietary - Contents may change without notice
Troulde-shooting 6-3.
Troulde-shooting Memo 6-12 SAMSUNG Proprietary - Contents may change without notice
9.
Circuit Diagram 9-1 Cellular Phone PCB 9-1-1 SAMSUNG Proprietary - Contents may change without notice 9-2
Circuit Diagram 9-1-2 SAMSUNG Proprietary - Contents may change without notice 9-3
PCB Diagrams 9-1-3 SAMSUNG Proprietary - Contents may change without notice 9-4
PCB Diagrams 9-1-4 9-5 SAMSUNG Proprietary - Contents may change without notice
PCB Diagrams 9-2 Desk-Top rapid Charger PCB 9-2-1 SAMSUNG Proprietary - Contents may change without notice 9-6
PCB Diagrams 9-2-2 9-7 SAMSUNG Proprietary - Contents may change without notice
PCB Diagrams 9-3 Hands-Free kit PCB 9-3-1 SAMSUNG Proprietary - Contents may change without notice 9-8
PCB Diagrams 9-3-2 9-9 SAMSUNG Proprietary - Contents may change without notice
PCB Diagrams 9-4 Cradle PCB SAMSUNG Proprietary - Contents may change without notice 9-10
PCB Diagrams 9-5 Car Adapter PCB 9-5-1 9-11 SAMSUNG Proprietary - Contents may change without notice
PCB Diagrams 9-5-2 9-12 SAMSUNG Proprietary - Contents may change without notice
PCB Diagrams 9-6 Rapid Travel Charger PCB 9-6-1 9-13 SAMSUNG Proprietary - Contents may change without notice
PCB Diagrams 9-6-2 9-14 SAMSUNG Proprietary - Contents may change without notice
11.
Circuit Diagram 11-1 Main Circuit Diagram 11-1-1 SAMSUNG Proprietary - Contents may change without notice 11-2
Circuit Diagram 11-1-2 SAMSUNG Proprietary - Contents may change without notice 11-3
Circuit Diagram 11-1-3 SAMSUNG Proprietary - Contents may change without notice 11-4
Circuit Diagram 11-1-4 SAMSUNG Proprietary - Contents may change without notice 11-5
Circuit Diagram 11-1-5 SAMSUNG Proprietary - Contents may change without notice 11-6
Circuit Diagram 11-1-6 SAMSUNG Proprietary - Contents may change without notice 11-7
Circuit Diagram 11-2 Desk-Top rapid Charger Circuit Diagram SAMSUNG Proprietary - Contents may change without notice 11-8
Circuit Diagram 11-3 Hands-Free Kit Circuit Diagram(1/2) SAMSUNG Proprietary - Contents may change without notice 11-9
Circuit Diagram Hands-Free Kit Circuit Diagram(2/2) SAMSUNG Proprietary - Contents may change without notice 11-10
Circuit Diagram 11-4 Cradle Circuit Diagram SAMSUNG Proprietary - Contents may change without notice 11-11
Circuit Diagram 11-5 Car Adapter Circuit Diagram SAMSUNG Proprietary - Contents may change without notice 11-12
Circuit Diagram 11-6 Rapid Travel Charger Circuit Diagram 11-13 SAMSUNG Proprietary - Contents may change without notice
