Samsung SCH-570 Service Manual Download Page 25 | Manualshive

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8-2

8-1-2 Abnormal Initial Operation

(3.3V voltage source)

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Summary of Contents for SCH-570

Page 1: ... Programming 4 Data Transfer 5 Circuit Description 6 Exploded View and Its Parts List 7 PCB Diagrams 8 Troubleshooting 9 Test Command T able 10 Block Circuit Diagrams CDMA Portable Cellular Telephone SERVICE Manual SCH 570 CDMA Portable Cellular Telephone ...

Page 2: ...Samsung Electronics Co Ltd SEP 1998 Printed in Korea Code No GH68 60724A HONGKONG CHINA ...

Page 3: ...off and Dynamic RF Power Control technologies are combined into this phone to reduce the call drop while usage CDMA digital cellular network consists of MSO Mobile Switching Office BSC Base Station Controller BTS Base Station Transmission System and MS Mobile Station MS meets the specifications of the below IS 95A Mobile Station Base Station Compatibility Standard for Dual Mode Wideband Spread Spe...

Page 4: ...040MHz 6 193 830 790MHz 16 609 843 270MHz 7 234 832 020MHz 17 650 844 270MHz 8 275 833 250MHz 18 697 845 910MHz 9 316 834 480MHz 19 738 847 140MHz 10 363 835 890MHz 20 779 848 370MHz MSC Receiver Frequency FA NO CH NO CENTER FREQUENCY FA NO CH NO CENTER FREQUENCY 1 1011 869 640MHz 11 404 882 120MHz 2 29 870 870MHz 12 445 883 350MHz 3 70 872 100MHz 13 486 884 580MHz 4 111 873 330MHz 14 527 885 810M...

Page 5: ...ithin 300 Hz Occupied Band Width 1 32 MHz TX Conducted Spurious Emissions 900 kHz below 42 dBc 30 kHz 1 98 MHz below 54 dBc 30 kHz Minimum TX Power Control below 50 dBm Open Loop Power Control 25 dBm 57 0 dBm 38 5 dBm 65 dBm 17 5 dBm 1 5 dBm 104 dBm 18 0 dBm 30 0 dBm Stand by Output Power below 61 dBm Closed Loop TX Power Control Range Test 1 within 24 dB Test 2 0 ms 2 5 ms Test 3 within 24 dB Tes...

Page 6: ...lows CPU INTEL 80186 core inside the MSM FLASH ROM U701 8 Mbit FLASH MEMORY SRAM U703 2 Mbit STATIC RAM FLASH ROM U702 1 Mbit FLASH MEMORY EEPROM U102 128 Kbit SERIAL EEPROM CPU INTEL 80186 CMOS type 16 bit microprocessor is used for the main processing The CPU controls all the circuitry For the CPU clock 27MHz resonator is used FLASH ROM One 8 MBIT FROM is used to store the terminal s program Usi...

Page 7: ...d in CDMA RX mode ADC Interface ADC_CLK pin 3 ADC_ENABLE pin 1 and ADC_DATA pin 2 are required to control the internal ADC in the BBA Data Port Interface Includes the UART Also supports Diagnostic Monitor DM HP equipment interface down loading and data service CODEC Interface The MSM sends 2 048 MHz PCM_CLK pin 19 and 8 KHz PCM_SYNC pin 16 20 to the CODEC U117 The voice PCM data from the MSM U101 ...

Page 8: ...1 to be sent to the speaker unit TX WBD ST SAT These signals are generated from MSM The modulation level of TX WBD and ST is 8 kHz dev and SAT is 2 kHz dev BUZZER DRIVING CIRCUITRY Buzzer generates alert tone when the buzzer receives the timer signal from the MSM it generates alert tone The buzzer level is adjusted by the alert signal s period generated from the MSM timer KEY TONE GENERATION Ringe...

Page 9: ...85 38 MHz IF signal is made by subtracting 881 12 5 MHz RF signal from 966 12 5 MHz first local signal AUTOMATIC GAIN CONTROLLER AGC AMP Q302 85 38 MHz IF signal is applied to IF AGC amp the IF AGC output level is applied to BBA Baseband Analog ASIC The IF AGC amp Q302 keeps the signal at a constant level by controlling the gain Dynamic range is 90dB up gain 45dB and down gain 45dB IF SAW BAND PAS...

Page 10: ...EMPERATURE COMPENSATED CRYSTAL OSCILLATOR VC TCXO U343 It provides 19 68 MHz reference frequency to PLL A correct frequency tuning is made by the voltage control DUPLEXER F301 Duplexer F301 controls to transmit through the antenna only the signals within acceptable Tx frequency range 836 12 5 MHz and to receive through the antenna only the signals within acceptable Rx frequency range 881 12 5 MHz ...

Page 11: ...cal signal to generate 836 12 5 MHz from the BBA 836 12 5 MHz signal comes out of the mixer output by subtracting 130 MHz IF signal from 966 12 5 MHz first local signal RF AUTOMATIC GAIN CONTROLLER AMP U461 U464 The signal out to the base station should be a constant level The TX RF AGC amp controls power to keep the signal at a constant level RF BAND PASS FILTER BPF F451 The RF BPF F451 accepts o...

Page 12: ...6 1 6 1 Fixed Phone Exploded View 6 Exploded View and its Parts List ...

Page 13: ...6 2 6 2 Fixed Phone Parts List ...

Page 14: ...6 3 6 3 Rapid Charger View SEC CODE GH44 40100A ...

Page 15: ...7 PCB Diagrams 7 1 Cellular Phone 7 1 7 1 1 Main Board PCB Top ...

Page 16: ...7 2 7 1 2 Main Board PCB Bottom ...

Page 17: ...SIGNAL Q113 Q115 0501 000689 TR SMALL SIGNAL Q304 0501 002063 TR SMALL SIGNAL Q303 0501 002208 TR SMALL SIGNAL Q109 0504 000167 TR DIGITAL Q119 Q481 Q482 0504 000168 TR DIGITAL Q103 Q121 0504 000172 TR DIGITAL Q111 Q120 0504 001016 TR DIGITAL Q485 0501 001062 FET GaAs U301 0505 001095 FET SILICON U106 0505 001119 FET SILICON Q302 0505 001165 FET SILICON U104 0505 001170 FET SILICON U484 0601 00035...

Page 18: ...NTROLLER U123 1204 001106 IC ASP U117 1205 001253 IC MIXER U460 1205 001383 IC DATA COMM U101 1205 001451 IC DATA COMM U401 1209 000142 IC SYNTHESIZER U342 1209 001078 IC PLL SYNTHESIZER U402 1404 001040 THERMISTOR NTC R498 2007 000070 R CHIP 0 L450 2007 000137 R CHIP 2 K 1 16 W R417 R130 2007 000138 R CHIP 100 1 16 W R154 2007 000140 R CHIP 1 K 1 16 W R192 R205 R156 R158 R147 2007 000140 R CHIP 1...

Page 19: ...W R481 R482 R483 R484 2007 000157 R CHIP 47 K 1 16 W R349 R139 2007 000159 R CHIP 56 K 1 16 W R148 2007 000162 R CHIP 100 K 1 16 W R122 R151 R153 R107 R171 2007 000162 R CHIP 100 K 1 16 W R120 R116 R111 R112 R108 2007 000162 R CHIP 100 K 1 16 W R110 R105 R123 R118 2007 000164 R CHIP 150 K 1 16 W R114 2007 000171 R CHIP 0 1 16 W R183 R216 R215 R364 R425 2007 000171 R CHIP 0 1 16 W R408 R409 R165 R2...

Page 20: ...007 001325 R CHIP 3 3 K 1 16 W R190 2007 001333 R CHIP 18 K 1 16 W R335 2007 000161 R CHIP 82 K 1 16 W R166 2007 002797 R CHIP 560 1 16 W R452 2007 002965 R CHIP 15 1 16 W R313 2007 007001 R CHIP 3 9 K 1 16 W R160 R161 R179 2007 007131 R CHIP 13 K 1 1 16 W R488 2007 007132 R CHIP 15 K 1 16 W R489 2007 007133 R CHIP 300 1 16 W R404 2007 007480 R CHIP 130 K 1 1 16 W R101 2007 007529 R CHIP 91 K 1 1 ...

Page 21: ... 12 PF C322 2203 000359 C CHIP 150 PF C453 2203 000386 C CHIP 15 PF C303 2203 000425 C CHIP 18 PF C137 C138 2203 000438 C CHIP 1 nF C125 C101 C140 C190 C344 2203 000438 C CHIP 1 nF C302 C301 C311 C310 C315 2203 000438 C CHIP 1 nF C377 C305 C336 C338 2203 000438 C CHIP 1 nF C450 C414 C428 C426 C424 2203 000438 C CHIP 1 nF C422 C436 C434 C432 C430 2203 000438 C CHIP 1 nF C496 C442 C459 C460 C464 220...

Page 22: ...C304 2203 005052 C CHIP 3 3PF C406 2203 005061 C CHIP 100 nF C176 C174 C178 C170 C172 2203 005061 C CHIP 100 nF C173 C168 C129 C114 C128 2203 005061 C CHIP 100 nF C146 C136 C205 C202 C203 2203 005061 C CHIP 100 nF C184 C116 C118 C157 2203 005061 C CHIP 100 nF C127 C106 C108 C120 C122 2203 005144 C CHIP 1 UF C130 C143 C150 C151 2404 000139 C TA 10 UF 6 3 V C107 C109 C312 C330 C389 2404 000139 C TA ...

Page 23: ...3 INDUCTOR 4 7 nH C446 2703 001284 INDUCTOR 5 6 nH L302 C391 2703 001306 INDUCTOR 27 nH L453 L456 2703 001409 INDUCTOR 12 nH L306 C115 2703 001543 INDUCTOR 33 nH L401 2703 001563 INDUCTOR 10 uH L101 2703 001613 INDUCTOR 18 nH L304 2703 001693 INDUCTOR 330 nH L310 2802 001048 RESONATOR 27 MHz X101 2806 001146 OSCILLATOR VCO U341 2809 001208 OSCILLATOR VCTCXO 19 68MHz U343 2904 000297 FILTER SAW 85 ...

Page 24: ...8 1 8 Troubleshooting 8 1 Logic Section 8 1 1 No Power ...

Page 25: ...8 2 8 1 2 Abnormal Initial Operation Normal 3 3V voltage source ...

Page 26: ...8 3 8 1 3 Abnormal Backlight Operation ...

Page 27: ...8 4 8 1 4 Abnormal Key Data Input ...

Page 28: ...8 5 8 1 5 Abnormal Keytone ...

Page 29: ...8 6 8 1 6 Abnormal Alert Tone ...

Page 30: ...8 7 8 2 RF Section 8 2 1 RF Secton Troubleshooting ...

Page 31: ...8 8 8 2 2 Receiver Part ...

Page 32: ...8 9 8 2 3 Transmitter Part ...

Page 33: ...10 Block Circuit Diagrams 10 1 Block Diagram ...

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