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Samsung SCH-A205 Service Manual

Dual mode(cdma/amps) portable telephone
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SERVICE
DUAL MODE TELEPHONE
DUAL MODE(CDMA/AMPS)
PORTABLE TELEPHONE
SCH-A205
Manual
3. Circuit Description
CONTENTS

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Summary of Contents for Samsung SCH-A205

  • Page 1: Table Of Contents

    DUAL MODE(CDMA/AMPS) PORTABLE TELEPHONE SCH-A205 Manual SERVICE CONTENTS DUAL MODE TELEPHONE 1. General Instruction 2. Specification 3. Circuit Description 4. NAM Programming 5. Test Procedure & Test Command 6. Electrical Parts List 7. Block Diagram 8. PCB Diagram 9. Schematic Diagrams...
  • Page 2 ELECTRONICS Samsung Electronics Co.,Ltd. Dec. 99 Pinted in Korea. Code No.: GH68-02022A...

  • Page 3: General Instruction

    1. General Instruction The SCH-A205 cellular phone functions as both analog cellular phone working in AMPS(Advanced Mobile Phone Service) mode and Digital cellular phone working in CDMA(Code Division Multiple Access) mode. CDMA type digital mode applies DSSS(Direct Sequential Spread Spectrum) mode which first came to be used in the military.

  • Page 4: Specification

    TCXO freq. 19.68MHz 19.68MHz Freq. Stability -45MHz) ±300Hz ±2.5ppm Operating Temperature -30°C ~ +60°C -30°C ~ +60°C Supply Voltage 3.75V Size and Weight : 80mm X 43mm X 25.5mm, 85 g, 800 mA SAMSUNG Proprietary - Contents may change without notice...

  • Page 5: Digital Mode

    -104dBm: +18.0dBm ~ +30.0dBm Standby Output Power below -61dBm Colsed Loop TX Power Control Range Test1: ±24dB or less Test2: 0mS ~ 2.5mS Test3: ±24dB or more Test4: ±24dB or more Test5: ±24dB or more SAMSUNG Proprietary - Contents may change without notice...
  • Page 6 65 dB +90KHz ~ 2f above 63 +10 LOG (PY) dB (where f =carrier frequency PY=mean output power in watts) Harmonic and conducted Spurious Emissions below 43 + 10 LOG (PY) dB SAMSUNG Proprietary - Contents may change without notice...
  • Page 7 25 ~ 70 MHz -45dBm 70 ~ 130MHz -41dBm 130 ~ 174 MHz -41 ~ -32dBm 174 ~ 260 MHz -32dBm 260 ~ 470 MHz -32 ~ -26dBm 470 ~ 1GHz -21dBm SAMSUNG Proprietary - Contents may change without notice...
  • Page 8 FA NO. CH NO. Center Frequency FA NO. CH NO. Center Frequency 1011 869.64MHz 882.12MHz 87.087MHz 883.35MHz 872.10MHz 884.58MHz 873.33MHz 885.81MHz 874.56MHz 887.04MHz 875.79MHz 888.27MHz 877.02MHz 889.27MHz 878.25MHz 890.91MHz 879.58MHz 892.14MHz 880.89MHz 893.37MHz SAMSUNG Proprietary - Contents may change without notice...
  • Page 9 • SATx : Supervisory Audio Tone code (0~3) SID xxxxx • x (Using Frequency Band) : A Band or B Band PWR x RSSI xxx SAT x CH xxxx • RSSIxxx : RSSI value • CHxxx : Using Channel SAMSUNG Proprietary - Contents may change without notice...

  • Page 10: Nam Programming

    To program the more NAM item push the OK(scroll) key to More Prog.? the right or left. Press the OK key. If service code prompt is displayed, you have to enter the service code. SAMSUNG Proprietary - Contents may change without notice...
  • Page 11 Slot Cycle Index Slot Index or The higher, the longer sleeping time To change Slot Cycle Index, enter the new data from 0 to 7 Press the OK key to store it. SAMSUNG Proprietary - Contents may change without notice...
  • Page 12 Press the OK key to store it. NAM1 Digital New data Secondary CDMA channel for system B Schn Sys B or To change the channel, enter the new one. 777 OK Press the OK key to store it. SAMSUNG Proprietary - Contents may change without notice...
  • Page 13 NAM1 Digital CDMA fNID OK NAM1 Digital CDMA Access Overload Class, current status is displayed. ACCOLC NAM program Scroll 1:General You can programm the NAM2 by chosing 'Setup NAM2'. 2:Setup NAM1 3:Setup NAM2 SAMSUNG Proprietary - Contents may change without notice...

  • Page 14: Test Procedure

    CAUTION : The test jig and data cable has a voltage drop of 0.18V at FM Max power output you’d for normal test condition. (Nominal voltage of battery is 3.75V at cellular phone) SAMSUNG Proprietary - Contents may change without notice...
  • Page 15 5-2 List of Equipment - DC Power Supply - Test Jig - Test Cable - CDMA Mobile Station Test Set HP8924C, HP83236A, CMD-80, etc - Spectrum Analyzer(include CDMA Test Mode) HP8596E Test Jig DC POWER INPUT PORT CHANGE VOLTAGE LEVEL BY MODEL(6dr? avde) AUDIO SELECT RED:+...
  • Page 16 5-3 TEST CABLE DESCRIPTION FOR SCH-A205 1. TEST CABLE 2. TEST CABLE CONNECTIONS MHC 172 RF CABLE (1.4 dB Loss in 800MHz) BNC CONNECTOR (RF) PLUG CONNECT TO SCH-N100/N101/N105 DATA CABLE Dsub 25PIN CONNECTOR (DATA) SAMSUNG Proprietary - Contents may change without notice...
  • Page 17 3. Dsub 25 PIN CONNECTOR PIN DESCRIPTION (TEST CABLE 1, BACK SIDE) DATA Dsub CONN. DATA Dsub CONN. DESCRIPTION PIN NO. DESCRIPTION PIN NO. DP_RX_DATA DGND 2, 4, 6, 13, 19 HP_PWR BATT 15, 16, 22 3, 20 TX_AUDIO DP_TX_DATA RX_AUDIO SAMSUNG Proprietary - Contents may change without notice...
  • Page 18 D. To finish the Test Mode, You should enter the command "0 2", and enter to Test Mode ("* 7 5 9 # 8 1 3 5 8 0"). "0 1" : Suspend. SAMSUNG Proprietary - Contents may change without notice...
  • Page 19 I. "7 2 * * * " : Output RF power level is set as power level 2 "* * *" means AGC level and AGC level range is f rom 0 to 511. J. "1 0 2" : RF Power level control, 2(0~7) means power level . SAMSUNG Proprietary - Contents may change without notice...
  • Page 20 "7 1 X X X #" : Enter AGC Code(XXX) to adjust RF Output Power. Measure the spurious at FC ±900kHz, FC ±1.98MHz, 2FC, 3FC, 1/2FC. spec: FC ±900kHz below 42dBc/30kHz FC ±1.98MHz below 54dBc/30kHz Outside Receive Band 43+10log (PY) PY: Mean Output Power in watts. SAMSUNG Proprietary - Contents may change without notice...
  • Page 21 Measure the Gated Power & Time. spec : Gated Power - at least 20dB Gated Time - Rising Time : below 6 µs Falling Time : below 6 µs Burst Time : below 1.25 µs SAMSUNG Proprietary - Contents may change without notice...
  • Page 22 "4 6" : Initialize Vocoder in Analog mode. "0 9 0 3 6 3 #" : Set channel to 363. "0 7" : Carrier On. "731" : Drive Amp "ON". Measure the TX frequency : 835.89 MHz ±.5ppm. SAMSUNG Proprietary - Contents may change without notice...
  • Page 23 Modulation frequency : 6kHz Frequency deviation : 2kHz Measure the Tx SAT deviation by using the HPF of 50Hz and the LPF of 6kHz (spec : 2kHz ±10%). "3 3" : SAT off. SAMSUNG Proprietary - Contents may change without notice 5-10...
  • Page 24 "1 2" : RX Audio unmute. Set the equipment as following. RF frequency : 880.89MHz Input RF level : -80dBm Modulation frequency : 1kHz Frequency deviation : ±8kHz Measure audio AC level. SAMSUNG Proprietary - Contents may change without notice 5-11...

  • Page 25: Test Command Table

    T_VOC_CDMA_UNITY_GAIN_I Vocoder CDMA unity gain 41(A9,3,0,255) T_VOC_FM_HFRX_UPGAIN_I Vocoder fm hfrx upgain 42(AA,1,0) T_DTMFON_I Turn on DTMF 43(AB,0,0) T_DTMFOFF_I Turn off DTMF 44(B0,0,0) T_COMPANDORON_I Turn on compandor 45(B1,0,0) T_COMPANDOROF_I Turn off compandor SAMSUNG Proprietary - Contents may change without notice 5-12...
  • Page 26 95(F5, 4, 0,1023) T_SW_CHANFLAT_I Tx MAX Power Limit Adjust with CH compensation 96(F6,4,0) T_CH_FLATNESS_I Adjust TX high power RAS 97(F2,4,0) T_FM_TX_PWR_I Adjust FM Power level 2 ~ 7 99(FC,4,0) T_SND_GAIN_I Mic/Speaker Gain control SAMSUNG Proprietary - Contents may change without notice 5-13...
  • Page 27 F=0.03 X (N- 1023) + 825.00 F ; FREQUENCY 1 ≤ N ≤ 799 RX FREQUENCY F=0.03 X N + 870.00 991 ≤ N ≤ 1023 F=0.03 X (N- 1023) + 870.00 SAMSUNG Proprietary - Contents may change without notice 5-14...

  • Page 28: Electrical Parts List

    C154 2203-000254 C-CERAMIC,CHIP 10nF,10%,16V,X7R,TP,1005,- C155 2203-000254 C-CERAMIC,CHIP 10nF,10%,16V,X7R,TP,1005,- C157 2203-005061 C-CERAMIC,CHIP 100nF,+80-20%,16V,Y5V,TP,1005 C158 2203-001210 C-CERAMIC,CHIP 8.2nF,10%,16V,X7R,TP,1005,- C159 2203-001210 C-CERAMIC,CHIP 8.2nF,10%,16V,X7R,TP,1005,- C160 2203-000233 C-CERAMIC,CHIP 0.1nF,5%,50V,NP0,TP,1005 C161 2203-000233 C-CERAMIC,CHIP 0.1nF,5%,50V,NP0,TP,1005 C162 2203-000233 C-CERAMIC,CHIP 0.1nF,5%,50V,NP0,TP,1005 SAMSUNG Proprietary - Contents may change without notice...
  • Page 29 C281 2203-000254 C-CERAMIC,CHIP 10nF,10%,16V,X7R,TP,1005,- C282 2203-000254 C-CERAMIC,CHIP 10nF,10%,16V,X7R,TP,1005,- C284 2203-005065 C-CERAMIC,CHIP 1000nF,+80-20%,10V,Y5V,TP,1608 C286 2203-000812 C-CERAMIC,CHIP 0.033nF,5%,50V,NP0,TP,1005 C287 2203-005065 C-CERAMIC,CHIP 1000nF,+80-20%,10V,Y5V,TP,1608 C288 2203-000812 C-CERAMIC,CHIP 0.033nF,5%,50V,NP0,TP,1005 C289 2203-005061 C-CERAMIC,CHIP 100nF,+80-20%,16V,Y5V,TP,1005 C290 2203-000940 C-CERAMIC,CHIP 470pF,10%,50V,X7R,TP,1005,- SAMSUNG Proprietary - Contents may change without notice...
  • Page 30 C342 2203-000438 C-CERAMIC,CHIP 1nF,10%,50V,X7R,TP,1005,- C343 2203-000254 C-CERAMIC,CHIP 10nF,10%,16V,X7R,TP,1005,- C344 2404-001105 C-TA,CHIP 10UF,20%,6.3V,GP,TP,2012 C345 2203-000233 C-CERAMIC,CHIP 0.1nF,5%,50V,NP0,TP,1005 C346 2203-000233 C-CERAMIC,CHIP 0.1nF,5%,50V,NP0,TP,1005 C348 2203-005393 C-CERAMIC,CHIP 0.005nF,0.1pF,50V,NP0,TP,1005 C349 2203-000254 C-CERAMIC,CHIP 10nF,10%,16V,X7R,TP,1005,- C350 2203-000940 C-CERAMIC,CHIP 470pF,10%,50V,X7R,TP,1005,- SAMSUNG Proprietary - Contents may change without notice...
  • Page 31 C409 2203-000438 C-CERAMIC,CHIP 1nF,10%,50V,X7R,TP,1005,- C410 2203-001405 C-CERAMIC,CHIP 22nF,+80-20%,25V,Y5V,TP,1005 C411 2203-002987 C-CERAMIC,CHIP 0.062nF,5%,50V,NP0,TP,1005 C412 2203-002987 C-CERAMIC,CHIP 0.062nF,5%,50V,NP0,TP,1005 C413 2203-003054 C-CERAMIC,CHIP 0.009nF,0.25pF,50V,NP0,TP,1005 C414 2203-000940 C-CERAMIC,CHIP 470pF,10%,50V,X7R,TP,1005,- C416 2203-000438 C-CERAMIC,CHIP 1nF,10%,50V,X7R,TP,1005,- C417 2203-005065 C-CERAMIC,CHIP 1000nF,+80-20%,10V,Y5V,TP,1608 SAMSUNG Proprietary - Contents may change without notice...
  • Page 32 C481 2203-000254 C-CERAMIC,CHIP 10nF,10%,16V,X7R,TP,1005,- C482 2203-001405 C-CERAMIC,CHIP 22nF,+80-20%,25V,Y5V,TP,1005 C483 2203-000438 C-CERAMIC,CHIP 1nF,10%,50V,X7R,TP,1005,- C484 2203-000359 C-CERAMIC,CHIP 0.15nF,5%,50V,NP0,TP,1005 C485 2203-005061 C-CERAMIC,CHIP 100nF,+80-20%,16V,Y5V,TP,1005 C492 2203-001432 C-CERAMIC,CHIP 47nF,+80-20%,16V,Y5V,TP,1005 C493 2404-001105 C-TA,CHIP 10UF,20%,6.3V,GP,TP,2012 C494 2203-000233 C-CERAMIC,CHIP 0.1nF,5%,50V,NP0,TP,1005 SAMSUNG Proprietary - Contents may change without notice...
  • Page 33 L321 2703-001913 INDUCTOR-SMD 220nH,5,1.8x1.12x1.02mm L322 2703-000301 INDUCTOR-SMD 2.7uH,10%,0.8x1.6x0.8mm L323 2703-000301 INDUCTOR-SMD 2.7uH,10%,0.8x1.6x0.8mm L324 2703-000301 INDUCTOR-SMD 2.7uH,10%,0.8x1.6x0.8mm L325 3301-001105 CORE-FERRITE AB,1.6x0.8x0.8mm,-,- L331 2703-001913 INDUCTOR-SMD 220nH,5,1.8x1.12x1.02mm L332 2703-001913 INDUCTOR-SMD 220nH,5,1.8x1.12x1.02mm L334 3301-001105 CORE-FERRITE AB,1.6x0.8x0.8mm,-,- SAMSUNG Proprietary - Contents may change without notice...
  • Page 34 R106 2007-000148 R-CHIP 10Kohm,5%,1/16W,DA,TP,1005 R109 2007-000162 R-CHIP 100Kohm,5%,1/16W,DA,TP,1005 R121 2007-000157 R-CHIP 47Kohm,5%,1/16W,DA,TP,1005 R122 2007-000162 R-CHIP 100Kohm,5%,1/16W,DA,TP,1005 R123 2007-000141 R-CHIP 2.2Kohm,5%,1/16W,DA,TP,1005 R124 2007-000162 R-CHIP 100Kohm,5%,1/16W,DA,TP,1005 R125 2007-000162 R-CHIP 100Kohm,5%,1/16W,DA,TP,1005 R126 2007-000162 R-CHIP 100Kohm,5%,1/16W,DA,TP,1005 SAMSUNG Proprietary - Contents may change without notice...
  • Page 35 R188 2007-000137 R-CHIP 2Kohm,5%,1/16W,DA,TP,1005 R189 2007-000162 R-CHIP 100Kohm,5%,1/16W,DA,TP,1005 R190 2007-000137 R-CHIP 2Kohm,5%,1/16W,DA,TP,1005 R191 2007-000137 R-CHIP 2Kohm,5%,1/16W,DA,TP,1005 R192 2007-000137 R-CHIP 2Kohm,5%,1/16W,DA,TP,1005 R200 2007-000148 R-CHIP 10Kohm,5%,1/16W,DA,TP,1005 R201 2007-000162 R-CHIP 100Kohm,5%,1/16W,DA,TP,1005 R202 2007-000162 R-CHIP 100Kohm,5%,1/16W,DA,TP,1005 SAMSUNG Proprietary - Contents may change without notice...
  • Page 36 R376 2007-000148 R-CHIP 10Kohm,5%,1/16W,DA,TP,1005 R377 2007-000140 R-CHIP 1Kohm,5%,1/16W,DA,TP,1005 R378 2007-003019 R-CHIP 430OHM,5%,1/16W,DA,TP,1005 R380 2007-000172 R-CHIP 10ohm,5%,1/16W,DA,TP,1005 R381 2007-000172 R-CHIP 10ohm,5%,1/16W,DA,TP,1005 R391 2007-000143 R-CHIP 4.7Kohm,5%,1/16W,DA,TP,1005 R401 2007-007107 R-CHIP 100Kohm,1%,1/16W,DA,TP,1005 R402 2007-002796 R-CHIP 510ohm,5%,1/16W,DA,TP,1005 SAMSUNG Proprietary - Contents may change without notice...
  • Page 37 100Kohm,1%,1/16W,DA,TP,1005 TH401 1404-001152 THERMISTOR-NTC 10KOHM,5%,3380K,1MW/C,TP U100 1205-001883 IC-TRANSCEIVER MSM3000,BGA,196P,-,PLASTIC,4.6V,-,-40to+85C,TR,- U110 1109-001153 IC-ETC. MEMORY 1349,2Mx16Bit,CSP,72P,-,90nS,3.3V,-,PLASTIC U111 0801-002345 IC-CMOS LOGIC 7S04,INVERTER,SOT-353,5P,49MIL,SINGLE,TP,PLASTIC U112 0801-000796 IC-CMOS LOGIC 7S32,OR GATE,SOT-353,5P,63MIL,SINGLE,TP,PLASTIC U113 0801-000796 IC-CMOS LOGIC 7S32,OR GATE,SOT-353,5P,63MIL,SINGLE,TP,PLASTIC SAMSUNG Proprietary - Contents may change without notice 6-10...
  • Page 38 0406-001084 DIODE-TVS SMF05,6/-/-V,200W,- ZD162 0406-001084 DIODE-TVS SMF05,6/-/-V,200W,- ZD163 0406-001084 DIODE-TVS SMF05,6/-/-V,200W,- ZD180 0406-001084 DIODE-TVS SMF05,6/-/-V,200W,- ZD181 0406-001084 DIODE-TVS SMF05,6/-/-V,200W,- ZD200 0406-001084 DIODE-TVS SMF05,6/-/-V,200W,- ZD210 0406-001084 DIODE-TVS SMF05,6/-/-V,200W,- ZD220 0406-001084 DIODE-TVS SMF05,6/-/-V,200W,- SAMSUNG Proprietary - Contents may change without notice 6-11...

  • Page 39: Block Diagram

    7. Block Diagram 7-1 Main (with EVRC option) Block Diagram SAMSUNG Proprietary - Contents may change without notice...

  • Page 40: Pcb Diagram

    8. PCB Diagram 8-1 Top View SAMSUNG Proprietary - Contents may change without notice...

  • Page 41: Bottom View

    8-2 Bottom View SAMSUNG Proprietary - Contents may change without notice...

  • Page 42: Schematic Diagrams

    6.3V V_DC IN 2 16 16 ON_SW HALL_ON 4 OUT GND 3 SVC_LED ALT_LED MIC+ R149 100NF +3.0V 100K BUZZER- TCXO_N TCXO LED_ON CONFIDENTIAL ZD161 ZD162 ZD160 ZD163 SMF05.TB SMF05.TB SMF05.TB SMF05.TB SAMSUNG Proprietary - Contents may change without notice...
  • Page 43 SCL 6 TX_AUDIO C220 KEYLED_ON C263 R264 C264 100NF R223 R224 R225 C210 R220 3.3K 3.9K 100NF +3.0V Q221 VIBRATOR DTC114EE/TR V_DC D240 DAN202UT106 Q240 MMBT2222AWT1 R240 BUZZER- CONFIDENTIAL RINGER_ON Q241 DTC323TU-T106 SAMSUNG Proprietary - Contents may change without notice...
  • Page 44 C398 6.3V 470PF C397 10UF 10NF 6.3V C374 R375 _RX_ON 120PF C377 C378 C379 100PF 100PF C351 RX_VCO1 100PF 220PF D380 1SV279-TPH3 C375 L372 0603CS-56NXJBC CONFIDENTIAL D381 C376 R376 1SV279-TPH3 120PF RX_VCO2 SAMSUNG Proprietary - Contents may change without notice...
  • Page 45 TX_OUT R449 J501 MHC-175 3705-001178 L501 ANT2 ANT1 12nH RF_DUP 3.0VT H_DET U491 MIC5205-3.0BM5/TR V_DC L502 C502 C496 1.5PF 1.5PF C492 C494 C493 100PF REF_BYP 47NF 10UF 100PF 6.3V C495 10NF _IDLE SAMSUNG Proprietary - Contents may change without notice...

  • Page 46: Exploded View & Its Part List

    10. Exploded View & Its Parts Lists 4-10 4-11 SAMSUNG Proprietary - Contents may change without notice 10-1...
  • Page 47 NPR-SHIELD FINGER GH71-00228A MPR-FINGER SHEET GH74-00578A MPR-TAPE IN EARPHONE GH74-00584A RMO-EARPHONE COVER GH73-00204C PMO-REAR COVER GH72-01914B MPR-TAPE EARPHONE GH74-00409C MPR-TAPE MOBILE GH74-00410D 4-10 SPRING-LOCKER GH61-00008A 4-11 PMO-LOCKER BATT GH72-02213B PMO-WATCH WINDOW GH72-02212B SAMSUNG Proprietary - Contents may change without notice 10-2...
  • Page 48 PMO-SHIELD COVER GH72-00747B MPR-SPONGE IFR GH74-00608A MAIN PBA GH92-00962A NPR-CONTACT ANT GH71-00095A MPR-ANT SPONGE GH74-01005A RMO-CONNECTOR COVER GH73-00202C RMO-MOBILE CAP GH73-00203B SILVER ANTENNA GH42-00086A ANTENNA TUBE SCREW 6001-000464 MACHINE,BH,M1.4,L4 BATTERY GH43-00196F SAMSUNG Proprietary - Contents may change without notice 10-3...

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