Samsung SCH-A302 Service Manual
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Samsung SCH-A302 Service Manual

Samsung SCH-A302 Service Manual

Cellular phone
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SERVICE
Cellular Phone
Cellular Phone
SCH-A302
Manual
CONTENTS

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Summary of Contents for Samsung SCH-A302

  • Page 1: Table Of Contents

    Cellular Phone SCH-A302 SERVICE Manual Cellular Phone CONTENTS 1. Specification 2. Trouble Shooting 3. Tune-up Procedure & Test Procedure list 4. Frequency Synthesizer Circuit & Spurious Radiation Suppression Circuit 5. NAM Programming 6. Electrical Parts List 7. Exploded Views & Parts List 8.
  • Page 2 ELECTRONICS ©Samsung Electronics Co.,Ltd. December. 2001 Pinted in Korea. Code No.: GH68-02488A BASIC.
  • Page 3 1. SCH-A302 Specification (REF TIA/EIA/IS-137-A-1) 1. GENERAL ITEM CDMA TX Freq. Range 824 ~ 849 MHz RX Freq. Range 869 ~ 894 MHz Channel Bandwidth 1.23 MHz Channel Spacing 30 kHz Number of Channels 20 FA Duplex Separation 45 MHz In/Output Impedance TX Intermediate Freq.

  • Page 4: Specification

    Closed Loop TX Power Control Range ± 24 dB Maximum RF Output Power 200 mW (+24.5 dBm) Occupied Band Width 1.32 MHz Conducted Spurious Emission @900 kHz -42 dBc / 30 kHz @1.25 MHz -54 dBc / 30 kHz SAMSUNG Proprietary-Contents may change without notice...
  • Page 5 Rx power = -90 dBm Tone 1 power = -32 dBm Tone 2 power = -32 dBm -Test 5, 6 Rx power = -79 dBm Tone 1 power = -21 dBm Tone 2 power = -21 dBm SAMSUNG Proprietary-Contents may change without notice...
  • Page 6 Check Q507, Q509 and its U501 pin38 Input=HIGH neighboring circuits Check U501 pin6 & pin10 and its U501 pin6 & pin10 neighboring circuits output=2.8 V? Check R536 and its neighboring U501 pin39 circuits Input=HIGH? SAMSUNG Proprietary-Contents may change without notice...

  • Page 7: Trouble Shooting

    OSC402 circuits. Replace if required. pin4? Check the LED and its neighboring LED on? circuits. Replace if required. Check the LCD pins and its Normal initial neighboring circuits. Replace if display on LCD? required. SAMSUNG Proprietary-Contents may change without notice...
  • Page 8 Replace if required. from U501 pin2? Backlight LED on 1-4. Abnormal Key Data Input Check initial status Scanning signals Check keypad dom switch. outputted from U609 pins C2, Replace if required. A3, E4, D3, C1? SAMSUNG Proprietary-Contents may change without notice...
  • Page 9 Replace if required. Resolder CON500 and its neighboring CLK waveform outputted circuits. Replace if required. from CON500 pin 5? Key tone waveform Check C631. Replace if required. applied to C561? Replace the SPK assembly. Normal Keytone? SAMSUNG Proprietary-Contents may change without notice...

  • Page 10: Transmitter Section

    2. Transmitter Section Turn On Max PWR Abormal transmitter section Check U204 TX RFT Check U402 local level. out level OK? -10~0 dBm Check U201 PWR AMP out level OK? CDMA : 25~26 dBm SAMSUNG Proprietary-Contents may change without notice...
  • Page 11 SCH-A302 Trouble Shooting 3. Receiver Section : CDMA MODE Start CDMA mode Normal CDMA Check CDMA Rx path. SVC & ROAM OK? Setup CDMA call. Check Transmitter. Measure CDMA FER Normal CDMA RF? SAMSUNG Proprietary-Contents may change without notice...
  • Page 12 - IF input is ok? U300 pin #11,12 (about 75 dBm) - RX 2 local is ok? U300 pin #21,22 (about 25 dBm) - 3.0 V IF (3.0IF) lines are ok? IFR operating voltage SAMSUNG Proprietary-Contents may change without notice...
  • Page 13 3.0_RX : H5 - RX CIRCUIT OPERATING VOLTAGE 3.0_TX : G5 TX CIRCUIT OPERATING VOLTAGE. (Controlled By Idle Signal) 3.0_IF : H7 RFT3100,IFR3000 AND Etc. 4-6. SAMPLING REPAIR RESULT (SCH-A302) (1) No.1 : 24108148669 Tx Power Problem - TX IF does not out from RFT3100 (U204) pin#1,2.
  • Page 14 - TCXO crack : TCXO replace O.K (9) No.9 : 24108233382 - ESN INVALID - ESN No was broken : 0000000 - ESN data at E2PROM was broken caused ESD or Electric shock. - E2PROM replace and rewriting ESN number. SAMSUNG Proprietary-Contents may change without notice...
  • Page 15 3. SCH-A302 Tune-up Rrocedure & Test Procedure list 1. List of Equipment • DC Power Supply • Test Jig : HHP I/F TESTJIG GH80-10502C • Test Cable : GH3900052A • RF Cable : GH3900075A • CDMA Mobile Station Test Set HP8924C, HP83236A, CMD-80, etc •...

  • Page 16: Tune-Up Procedure & Test Procedure List

    SCH-A302 Tune-up Rrocedure & Test Procedure list 3. Test Cable Description for SCH-A302 3-1. Test Cable 3-2. Test Cable Connections MHC 172 RF CABLE (1.4 dB Loss for CDMA800 and AMPS, 2.1 dB Loss for PCS) BNC CONECTOR (RF) PLUG CONNECT TO SCH-A302...
  • Page 17 : F ± 900 kHz below 42 dBc / 30 kHz ± 1.98 kHz below 54 dBc / 30 kHz Outside Receive Band 43 + 10 log (PY) PY : Mean Output Power in watts SAMSUNG Proprietary-Contents may change without notice...
  • Page 18 3. RF CH STD : MS AMPS 4. Traffic data mode : SVC OPT 2 5. Data Rate : FULL Rate 6. Power : CH power 7. Sector A power : -60 dBm 8. PWR COTL : CLOSED LOOP SAMSUNG Proprietary-Contents may change without notice...
  • Page 19 (7) Now you are ready to download new software. Then Click download icon ( the green runner ) to start download. Please wait until download is done. If download is completed properly, the phone will be restarted. SAMSUNG Proprietary-Contents may change without notice...
  • Page 20 4. SCH-A302 Frequency Synthesizer Circuit & Spurious radiation suppression circuit 1. Frequency Synthesizer Circuit The Frequency synthesizer is an indirect frequency synthesizer PLL(Phased Locked Loop). It consists of a VCTCXO(OSC401), PLL, VCO (OSC402, U402), and loop filter. VCTCXO The VCTCXO is a reference source of the frequency synthesizer. It provides 19.68MHz reference frequency to PLL, VCO (OSC402, U402).

  • Page 21: Frequency Synthesizer Circuit & Spurious Radiation Suppression Circuit

    Attenuation 824 ~ 849 MHz 56 dB Min Ripple at BW 2.0 dB Max T X to R X Isolation 824 ~ 849 MHz 55 dB Max 869 ~ 894 MHz 49 dB Max SAMSUNG Proprietary-Contents may change without notice...

  • Page 22: Nam Programming

    Slot Mode Slot mode. ‘Yes’ indicates the slot mode. or # -changes the status. -stores it. Slot Index Volume Slot mode index. The higher,the longer sleeping time -to change, enter new one. -stores it. SAMSUNG Proprietary-Contents may change without notice...
  • Page 23 CDMA SID to lockout is displayed 0000 SID number -to change, enter new one. -stores it. CDMA HOME SID CDMA Home system ID, current value is displayed. # or -changes the status. -stores it. SAMSUNG Proprietary-Contents may change without notice...
  • Page 24 4120 number displayed. -to change, enter new one. -stores it. HomeNID #1 ~ #4 CDMA HOME NIDs written in the list, current value is 65535 number displayed. -to change, enter new one. -stores it. SAMSUNG Proprietary-Contents may change without notice...

  • Page 25: Electrical Parts List

    SEC CODE Design LOC DESCRIPTIONS GH92-00996A GH41-00192A PCB-SCHA302 MAIN SCH-A302, -, 6L, -, 0.7T, 100 x 138 mm, -, 3, -, - GH71-00052A NPR-ANT.CONTACT SCH-A100, BE-CU, T0.1, AU GH73-00214A RMO-ANTENNA RUBBER SPH-A1000, RUBBER, 2 x 3 x T0.5, BLK, 50...
  • Page 26 C-CERAMIC, CHIP 0.047 nF, 5 %, 50 V, NP0, TP, 1005 2203-000254 C217 C-CERAMIC, CHIP 10 nF, 10 %, 16 V, X7R, TP, 1005, - 2203-001072 C218 C-CERAMIC, CHIP 0.056 nF, 5 %, 50 V, NP0, TP, 1005 SAMSUNG Proprietary-Contents may change without notice...
  • Page 27 C-CERAMIC, CHIP 1 nF, 10 %, 50 V, X7R, TP, 1005, - 2203-000359 C343 C-CERAMIC, CHIP 0.15 nF, 5 %, 50 V, NP0, TP, 1005 2203-005395 C344 C-CERAMIC, CHIP 0.0047 nF, 0.1 pF, 50 V, NP0, TP, 1005 SAMSUNG Proprietary-Contents may change without notice...
  • Page 28 C-CERAMIC, CHIP 1 nF, 10 %, 50 V, X7R, TP, 1005, - 2203-000438 C407 C-CERAMIC, CHIP 1 nF, 10 %, 50 V, X7R, TP, 1005, - 2203-000233 C408 C-CERAMIC, CHIP 0.1 nF, 5 %, 50 V, NP0, TP, 1005 SAMSUNG Proprietary-Contents may change without notice...
  • Page 29 C-CERAMIC, CHIP 10 nF, 10 %, 16 V, X7R, TP, 1005, - 2404-001151 C506 C-TA, CHIP 33 uF, 20 %, 6.3 V, LZ, TP, 3216 2203-000233 C507 C-CERAMIC, CHIP 0.1 nF, 5 %, 50 V, NP0, TP, 1005 SAMSUNG Proprietary-Contents may change without notice...
  • Page 30 C-CERAMIC, CHIP 47 nF, +80-20 %, 16 V, Y5 V, TP, 1005 2203-000438 C566 C-CERAMIC, CHIP 1 nF, 10 %, 50 V, X7R, TP, 1005, - 2203-000359 C567 C-CERAMIC, CHIP 0.15 nF, 5 %, 50 V, NP0, TP, 1005 SAMSUNG Proprietary-Contents may change without notice...
  • Page 31 C-CERAMIC, CHIP 1 nF, 10 %, 50 V, X7R, TP, 1005, - 3710-001653 CN101 CONNECTOR-SOCKET 18P, 1R, 0.5 mm, SMD-A, A uF 3705-001178 CN302 CONNECTOR-COAXIAL SMC, JACK, 100 Mohm, 50 ohm, .5DB 3722-001530 CN303 JACK-PHONE 5P, 2.6PI, A uF, BLK, - SAMSUNG Proprietary-Contents may change without notice...
  • Page 32 INDUCTOR-SMD 180 nH, 2 %, 1.6 x 0.8 x 0.8 mm 3301-001105 L318 CORE-FERRITE AB, 1.6 x 0.8 x 0.8 mm, -, - 2703-001514 L319 INDUCTOR-SMD 68 nH, 5 %, 1.8 x 1.12 x 1.02 mm SAMSUNG Proprietary-Contents may change without notice...
  • Page 33 TR-SMALL SIGNAL 2SC4617, NPN, 200 mW, EM3, TP, 120-5 0504-000168 Q508 TR-DIGITAL RN1104, NPN, 100 mW, 47K/47K, SSM, TP 0504-000168 Q509 TR-DIGITAL RN1104, NPN, 100 mW, 47K/47K, SSM, TP 0501-002202 Q511 TR-SMALL SIGNAL MMBT2222AWT1, NPN, 150 mW, SOT-323 SAMSUNG Proprietary-Contents may change without notice...
  • Page 34 R-CHIP 0 ohm, 5 %, 1/16 W, DA, TP, 1005 2007-007771 R144 R-CHIP 0 ohm, 5 %, 1/16 W, DA, TP, 1005 2007-000140 R147 R-CHIP 1 kohm, 5 %, 1/16 W, DA, TP, 1005 SAMSUNG Proprietary-Contents may change without notice 6-10...
  • Page 35 R-CHIP 330 ohm, 5 %, 1/16 W, DA, TP, 1005 2007-000148 R316 R-CHIP 10 kohm, 5 %, 1/16 W, DA, TP, 1005 2007-000148 R317 R-CHIP 10 kohm, 5 %, 1/16 W, DA, TP, 1005 SAMSUNG Proprietary-Contents may change without notice 6-11...
  • Page 36 R-CHIP 1 kohm, 5 %, 1/16 W, DA, TP, 1005 2007-001325 R509 R-CHIP 3.3 kohm, 5 %, 1/16 W, DA, TP, 1005 2007-001294 R510 R-CHIP 36 ohm, 5 %, 1/16 W, DA, TP, 1005 SAMSUNG Proprietary-Contents may change without notice 6-12...
  • Page 37 R-CHIP 470 kohm, 5 %, 1/16 W, DA, TP, 1005 2007-000148 R618 R-CHIP 10 kohm, 5 %, 1/16 W, DA, TP, 1005 2007-001339 R619 R-CHIP 180 kohm, 5 %, 1/16 W, DA, TP, 1005 SAMSUNG Proprietary-Contents may change without notice 6-13...
  • Page 38 DIODE-TVS SMS05C, 6 V, 300 W, SOT-23-6 0406-001051 ZD102 DIODE-TVS SMS05C, 6 V, 300 W, SOT-23-6 0406-001051 ZD103 DIODE-TVS SMS05C, 6 V, 300 W, SOT-23-6 0403-001387 ZD601 DIODE-ZENER UDZS5.1B, 4.89-5.2 V, 200 mW, SOD-323, TP SAMSUNG Proprietary-Contents may change without notice 6-14...

  • Page 39: Exploded Views & Parts List

    7. SCH-A302 Exploded View & parts list 1. Cellular phone Exploded View SAMSUNG Proprietary-Contents may change without notice...

  • Page 40: Cellular Phone Parts List

    SCH-A302 Exploded view and its Part List 2. Cellular phone Parts List SEC CODE Location Description Remark Gold Silver DUAL WINDOW GH72-03350A GH72-03350A SUA, FOLDER UPPER GH75-01081B GH75-01081C GH59-00109A FPCB ASS’Y GH59-00109A LCD PBA GH96-00918A GH96-00918A SPEAKER 3001-001176 3001-001176 VIBRATOR...

  • Page 41: Block Diagram

    8. SCH-A302 Block Diagram SAMSUNG Proprietary-Contents may change without notice...
  • Page 42 SCH-A302 Block Diagram MEMO SAMSUNG Proprietary-Contents may change without notice...

  • Page 43: Pcb Diagrams

    C 3 4 4 C 3 7 8 R 3 1 7 R316 C 3 8 2 R 3 7 2 C350 X501 C 3 4 5 R318 C428 L321 C 3 8 1 SAMSUNG Proprietary-Contents may change without notice...
  • Page 44 C516 C527 R427 C640 ZD102 C536 U601 F302 L403 Q503 Q502 R480 C533 C411 R632 R602 R506 R404 U404 C419 R617 Q509 R618 C530 L303 R515 L302 C146 R137 R140 R115 C414 C421 R415 SAMSUNG Proprietary-Contents may change without notice...
  • Page 45 10. SCH-A302 Circuit description & Circuit Diagrams 1. Logic Section (1) Power Supply For the POWER ON, with the battery installed on the phone and by pressing the PWR key, the VBAT and ON_SW signals will be connected, also by connecting the TA(travel adaptor). This will turn on Q507(2SC4617).
  • Page 46 TX: TX_AGC_ADJ(pin 2L) port is used to control the TX power level. The PA_ON(pin 1P) signal is used to control the power amplifier. RX: TRK_LO_ADJ(pin 1R) is used to compensate the TCXO clock. General Purpose I/O Register Pins Input/output ports to control external devices. SAMSUNG Proprietary-Contents may change without notice 10-2...

  • Page 47: Circuit Description & Circuit Diagrams

    Buzzer generate 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. SAMSUNG Proprietary-Contents may change without notice 10-3...
  • Page 48 836.03 ± 12.5 MHz signal comes out from the mixer output by substracting 130.38 MHz IF signal to 967.41 ± 12.5 MHz first local signal. Antenna Antenna allows signal to send to receive from the base station. SAMSUNG Proprietary-Contents may change without notice 10-4...
  • Page 49 The bandwidth is 25 MHz. PM1000 The PM1000(U501) supply a regulated power to each part of transmitter. U501 supplies 3.0 V to the RFT3100(U204) and V is connected to power amp module(U201) directly. BATT SAMSUNG Proprietary-Contents may change without notice 10-5...
  • Page 50 P ro ce ss or Mo de Sel ect I nt er f ace SB I AN SI/ I EEE 11 49. 1A - 199 3 JT A G Int er f c e Digital Test Bus SAMSUNG Proprietary-Contents may change without notice 10-6...
  • Page 51 Drawn by 5 SDA City AD(0) Size R&D CHK TITLE R134 DOC CTRL CHK SCH-A302 (i) MFG ENGR CHK Time Changed Changed by 2001.09.18 Date Changed QA CHK Drawing Number Sheet 5:00:42 pm SAMSUNG Proprietary-Contents may change without notice 10-7...
  • Page 52 COMPANY NAME Engineer Address Drawn by City Size TITLE R&D CHK SCH-302 (i) DOC CTRL CHK MFG ENGR CHK Time Changed Changed by Date Changed Drawing Number Sheet 2001.09.18 QA CHK 4:55:22 pm SAMSUNG Proprietary-Contents may change without notice 10-8...
  • Page 53 City RINGER 4.7K Size TITLE R&D CHK R544 Q511 100K SCH-A302 (i) DOC CTRL CHK C546 MFG ENGR CHK Time Changed Changed by Date Changed 2001.09.18 Drawing Number Sheet QA CHK 5:11:41 pm SAMSUNG Proprietary-Contents may change without notice 10-9...

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