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Checking Flow

4.2 TX Part Trouble. 4.2.1 DCN Tx Trouble. Checking Flow. START. √ Press “OK” + “0” + “000000” in Phone idle state √ Press “7” FCC Test √ Press “2” CDMA FCC -Set CH384 & AGC 360 √ Spectrum analyzer setting √ Oscilloscope setting. 1. Check Power Circuit. 6. Check HDET Circuit.

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Checking Flow

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  1. 4.2 TX Part Trouble 4.2.1 DCN Tx Trouble Checking Flow START √ Press “OK” + “0” + “000000”in Phone idle state √ Press “7” FCC Test √ Press “2” CDMA FCC -Set CH384 & AGC 360 √ Spectrum analyzer setting √ Oscilloscope setting 1. Check Power Circuit 6. Check HDET Circuit 2. Check VCTCXO Circuit 7. Check Duplexer 3. Check RFT6150 Circuit 8. Check Diplexer 4. Check RF SAW 9. Check Mobile Switch 5. Check PAM Circuit √ Re-download SW, CAL

  2. 4.2.1.1. Check Power Circuit Checking Flow TEST POINT U502 15 Start Check U502 Pin15 +3.0V ? NO Replace U502 YES Regulator Circuit is OK See Next Page Circuit Diagram

  3. 4.2.1.2. Check VCTCXO Circuit Test Point Checking Flow Start Check X101 Pin3 Refer to Graph4.2.1.2 VCTCXO Circuit is OK See next page Similar? YES NO Check X101 Pin4 X101. 3 X101. 4 +2.8V? NO Check U502 YES Replace X101 Circuit Diagram Waveform Graph.4.2.1.2

  4. 4.2.1.3. Check RFT Circuit Test Point DCN_RF_OUT TX_AGC_ADJ +3.0V_TX TCXO TX_Q_P/M TX_I_P/M +2.6V_MSMP2 TX_ON SBCK SBDT SBST Circuit Diagram

  5. Checking Flow Start Check U102 Pin23 CELL_OUT Refer to Graph4.2.1.3(A) Similar? YES RFT Circuit is OK See next page NO Check U102 I/Q Data Pin27. 28, 29, 30 Refer to Graph4.2.1.3(B) Check U102 Pin15 TCXO Refer to Graph4.2.1.3(C) Similar? NO Check U201 MSM Similar? NO Check TCXO Circuit YES Check U102 Pin32,6 +2.6V_MSMP2 +3.0V_TX YES Check U102 Pin 2,3,4 SBCK SBDT SBST Refer to Graph4.2.1.3(D) OK? NO Check Regulator Circuit Similar? NO YES Check SBI Signal Line & MSM Check U102 Pin1 (TX_ON Signal) YES Replace U102 ≥2.5V NO Check TX_ON Signal Line & MSM YES

  6. Waveform Graph 4.2.1.3(A) Graph 4.2.1.3(C) TX_I_P TX_Q_P TX_Q_N TX_I_N Graph 4.2.1.3(B) SBDT SBST SBCK SBCK Graph 4.2.1.3(D)

  7. 4.2.1.4. Check DCN RF Tx SAW Test Point Checking Flow Start RF_OUT Check F102 Pin1,3 RF_IN, RF_OUT Refer to Graph4.2.1.4 Similar? YES RF_IN RF TX SAW is OK See next page NO Replace F102 Circuit Diagram Waveform RF_IN RF_OUT Graph 4.2.1.4

  8. 4.2.1.5. Check DCN PAM Circuit Test Point Checking Flow RF OUTPUT Start Check U106 Pin2,7 RF_IN / RF_OUT Refer to Graph4.2.1.5 Similar? YES PAM Circuit is OK See next page NO Check U106 Pin1,8 ≥3.4V NO Check VCC Line VCC RF_IN PA_R1 PA_ON YES Check U106 Pin4 ≥2.5V NO Check +3.0V_TX Line And PA_ON YES Replace U106

  9. Circuit Diagram Waveform RF_IN RF_OUT Graph 4.2.1.5

  10. 4.2.1.6. Check HDET Circuit Test Point Checking Flow Start Check U104 Pin B2 Refer to Graph4.2.1.6 RF_IN Similar? YES HDET Circuit is OK See next page NO Check U104 Pin A1 +3.0V? NO Check R109 +3.0V_TX HDET_OUT YES Check U104 Pin A2 Circuit Diagram +3.0V? NO Check U502 YES Replace U104 Waveform Graph 4.2.1.6

  11. 4.2.1.7. Check DCN Duplexer Test Point Checking Flow Start ANT_PORT Check DP1 Pin1,6 TX_PORT, ANT_PORT Refer to Graph4.2.1.7 Similar? YES Duplexer is OK See next page NO Replace DP1 TX_PORT Circuit Diagram Waveform TX_PORT ANT_PORT Graph 4.2.1.7

  12. 4.2.1.8. Check Diplexer Circuit Test Point Checking Flow Start RF_OUT Check U112 Pin2,6 CELL_PORT ANT_PORT Refer to Graph4.2.1.8 Similar? YES Diplexer Circuit is OK See next page RF_IN NO Replace U112 Circuit Diagram Waveform RF_IN RF_OUT Graph 4.2.1.8

  13. 4.2.1.9. Check Mobile Switch Test Point Checking Flow Start Check U101 Pin2 RF_IN Refer to Graph4.2.1.9 Similar? YES Mobile Switch is OK See next page NO RF_IN Check C101, L103,VR100 Circuit Diagram Waveform RF_IN Graph 4.2.1.9

  14. 4.2.2 PCS Tx Trouble Checking Flow START √ Press “OK” + “0” + “000000”in Phone idle state √ Press “7” FCC Test √ Press “2” PCS FCC -Set CH600 & AGC 320 √ Spectrum analyzer setting √ Oscilloscope setting 1. Check Power Circuit 6. Check HDET Circuit 2. Check VCTCXO Circuit 7. Check Duplexer 3. Check RFT6150 Circuit 8. Check Diplexer 4. Check RF SAW 9. Check Mobile Switch 5. Check PAM Circuit √ Re-download SW, CAL

  15. 4.2.2.1. Check Power Circuit Checking Flow TEST POINT U502 15 Start Check U502 Pin15 +3.0V ? NO Replace U502 YES Regulator Circuit is OK See Next Page Circuit Diagram

  16. 4.2.2.2. Check VCTCXO Circuit Test Point Checking Flow Start Check X101 Pin3 Refer to Graph4.2.2.2 VCTCXO Circuit is OK See next page Similar? YES NO Check X101 Pin4 X101. 3 X101. 4 +2.8V? NO Check U502 YES Replace X101 Circuit Diagram Waveform Graph.4.2.2.2

  17. 4.2.2.3. Check RFT Circuit Test Point PCS_RF_OUT TX_AGC_ADJ +3.0V_TX TCXO TX_Q_P/M TX_I_P/M +2.6V_MSMP2 TX_ON SBCK SBDT SBST Circuit Diagram

  18. Checking Flow Start Check U102 Pin21 PCS_OUT Refer to Graph4.2.2.3(A) Similar? YES RFT Circuit is OK See next page NO Check U102 I/Q Data Pin27. 28, 29, 30 Refer to Graph4.2.2.3(B) Check U102 Pin15 TCXO Refer to Graph4.2.2.3(C) Similar? NO Check U201 MSM Similar? NO Check TCXO Circuit YES Check U102 Pin32,6 +2.6V_MSMP2 +3.0V_TX YES Check U102 Pin 2,3,4 SBCK SBDT SBST Refer to Graph4.2.2.3(D) OK? NO Check Regulator Circuit Similar? NO YES Check SBI Signal Line & MSM Check U102 Pin1 (TX_ON Signal) YES Replace U102 ≥2.5V NO Check TX_ON Signal Line & MSM YES

  19. Waveform Graph 4.2.2.3(A) Graph 4.2.2.3(C) TX_I_P TX_Q_P TX_Q_N TX_I_N Graph 4.2.2.3(B) SBDT SBST SBCK SBCK Graph 4.2.2.3(D)

  20. 4.2.2.4. Check PCS RF Tx SAW Test Point Checking Flow Start RF_OUT Check F103 Pin1,3 RF_IN, RF_OUT Refer to Graph4.2.2.4 Similar? YES RF TX SAW is OK See next page NO Replace F103 RF_IN Circuit Diagram Waveform RF_IN RF_OUT Graph 4.2.2.4

  21. 4.2.2.5. Check PCS PAM Circuit Test Point Checking Flow RF OUTPUT Start Check U107 Pin2,7 RF_IN / RF_OUT Refer to Graph4.2.2.5 Similar? YES PAM Circuit is OK See next page NO Check U107 Pin1,8 ≥3.4V NO Check VCC Line VCC RF_IN PA_R1 PA_ON YES Check U107 Pin4 ≥2.5V NO Check +3.0V_TX Line And PA_ON YES Replace U107

  22. Circuit Diagram Waveform RF_IN RF_OUT Graph 4.2.2.5

  23. 4.2.2.6. Check HDET Circuit Test Point Checking Flow Start Check U104 Pin B2 Refer to Graph4.2.2.6 RF_IN Similar? YES HDET Circuit is OK See next page NO Check U104 Pin A1 +3.0V? NO Check R109 +3.0V_TX HDET_OUT YES Check U104 Pin A2 Circuit Diagram +3.0V? NO Check U502 YES Replace U104 Waveform Graph 4.2.2.6

  24. 4.2.2.7. Check PCS Duplexer Test Point Checking Flow Start ANT_PORT Check DP2 Pin2,3 TX_PORT, ANT_PORT Refer to Graph4.2.2.7 Similar? YES Duplexer is OK See next page NO Replace DP2 TX_PORT Circuit Diagram Waveform TX_PORT ANT_PORT Graph 4.2.2.7

  25. 4.2.2.8. Check Diplexer Circuit Test Point Checking Flow Start RF_OUT Check U112 Pin2,4 CELL_PORT ANT_PORT Refer to Graph4.2.2.8 Similar? YES Diplexer Circuit is OK See next page RF_IN NO Replace U112 Circuit Diagram Waveform RF_IN RF_OUT Graph 4.2.2.8

  26. 4.2.2.9. Check Mobile Switch Test Point Checking Flow Start Check U101 Pin2 RF_IN Refer to Graph4.2.2.9 Similar? YES Mobile Switch is OK See next page NO RF_IN Check C101, L103,VR100 Circuit Diagram Waveform RF_IN Graph 4.2.2.9

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