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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 TEST POINT Checking Flow Start U400,73 Check U400, Pin73 +3.0V ? NO Replace U400 YES Regulator Circuit is OK See Next Page Circuit Diagram

  3. 4.2.1.2. Check VCTCXO Circuit Checking Flow Test Point Start X100, 4 Check X100, Pin3 Refer to Graph4.2.1.2 VCTCXO Circuit is OK See next page X100, 3 Similar? YES NO Check X100, Pin4 +2.8V? NO Check U400 YES Replace X100 Circuit Diagram Waveform Graph.4.2.1.2

  4. 4.2.1.3. Check RFT Circuit Test Point CELL_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 U111, Pin23 CELL_OUT Refer to Graph4.2.1.3(A) Similar? YES RFT Circuit is OK See next page NO Check U111 I/Q Data Pin27. 28, 29, 30 Refer to Graph4.2.1.3(B) Check U111, Pin15 TCXO Refer to Graph4.2.1.3(C) Similar? NO Check U201 MSM Similar? NO Check TCXO Circuit YES Check U111, Pin32,6 +2.6V_MSMP2 +3.0V_TX YES Check U115, 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 U111, Pin1 (TX_ON Signal) YES Replace U111 ≥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 RF_OUT Start Check F105 Pin1,3 RF_IN, RF_OUT Refer to Graph4.2.1.4 Similar? YES RF TX SAW is OK See next page NO Replace F105 RF_IN 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 VCC RF_OUT Start Check U106 Pin2,11 RF_IN / RF_OUT Refer to Graph4.2.1.5 Similar? YES PAM Circuit is OK See next page NO Check U106 Pin4,9,10 ≥3.4V NO RF_IN VCC Check VCC Line PA_ON PA_R1 YES Check U106 Pin1 ≥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 RF Coupler & HDET Circuit Test Point Checking Flow Start U141 Check U104 Pin B2 Refer to Graph4.2.1.6 Similar? YES HDET Circuit is OK See next page NO HDET_OUT Check U104 Pin A1 +3.0V? NO Check U141 RF_IN +3.0V_TX YES Check U104 Pin A2 Circuit Diagram +3.0V? NO Check U400 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 DP100 Pin1,6 TX_PORT, ANT_PORT Refer to Graph4.2.1.7 Similar? YES Duplexer is OK See next page NO Replace DP100 TX_PORT Circuit Diagram Waveform TX_PORT ANT_PORT Graph 4.2.1.7

  12. 4.2.1.8. Check Triplexer Circuit Test Point Checking Flow START ANT_PORT Check U101 Pin5,2 CELL_PORT ANT_PORT Refer to Graph 4.2.1.8 YES Triplexer Circuit is Ok See next page Similar? Triplexer Circuit is NO Check U101 Pin 5 CELL_PORT NO Check CDMA_MODE >=2.5 Signal Line & MSM YES Replace U101 Waveform Circuit Diagram CELL_PORT ANT_PORT Graph 4.2.1.8

  13. 4.2.1.9. Check Mobile Switch Test Point Checking Flow Start Check U115, Pin2 RF_IN Refer to Graph4.2.1.9 Similar? YES Mobile Switch is OK NO Check C102, L104 RF_IN 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 “1” 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 TEST POINT Checking Flow Start U400,73 Check U400, Pin73 +3.0V ? NO Replace U400 YES Regulator Circuit is OK See Next Page Circuit Diagram

  16. 4.2.2.2. Check VCTCXO Circuit Checking Flow Test Point Start X100, 4 Check X100, Pin3 Refer to Graph4.2.2.2 VCTCXO Circuit is OK See next page X100, 3 Similar? YES NO Check X100, Pin4 +2.8V? NO Check U400 YES Replace X100 Circuit Diagram Waveform Graph.4.2.2.2

  17. 4.2.2.3. Check RFT Circuit Test Point PCS_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 U111, Pin21 PCS_OUT Refer to Graph4.2.2.3(A) Similar? YES RFT Circuit is OK See next page NO Check U111 I/Q Data Pin27. 28, 29, 30 Refer to Graph4.2.2.3(B) Check U111, Pin15 TCXO Refer to Graph4.2.2.3(C) Similar? NO Check U201 MSM Similar? NO Check TCXO Circuit YES Check U111 Pin32,6 +2.6V_MSMP2 +3.0V_TX YES Check U111 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 U111, Pin1 (TX_ON Signal) YES Replace U111 ≥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 RF_OUT Start Check F104 Pin1,3 RF_IN, RF_OUT Refer to Graph4.2.2.4 Similar? YES RF TX SAW is OK See next page NO Replace F104 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 VCC RF_OUT Start Check U106 Pin5,7 RF_IN / RF_OUT Refer to Graph4.2.2.5 Similar? YES PAM Circuit is OK See next page NO Check U106 Pin4,9,10 ≥3.4V NO RF_IN VCC Check VCC Line PA_R1 PA_ON YES Check U106 Pin6 ≥2.5V NO Check +3.0V_TX Line And PA_ON YES Replace U106

  22. Circuit Diagram Waveform RF_IN RF_OUT Graph 4.2.2.5

  23. 4.2.2.6. Check RF Coupler & HDET Circuit Test Point Checking Flow Start Check U104 Pin B2 Refer to Graph4.2.2.6 Similar? YES HDET Circuit is OK See next page U142 NO HDET_OUT Check U104 Pin A1 +3.0V? NO Check U142 RF_IN +3.0V_TX YES Check U104 Pin A2 +3.0V? NO Check U400 Circuit Diagram 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 DP101 Pin2,3 TX_PORT, ANT_PORT Refer to Graph4.2.2.7 Similar? YES Duplexer is OK See next page NO Replace DP101 TX_PORT Circuit Diagram Waveform TX_PORT ANT_PORT Graph 4.2.2.7

  25. 4.2.2.8. Check Triplexer Circuit Test Point Checking Flow START ANT_PORT Check U101 Pin7,2 PCS_PORT ANT_PORT Refer to Graph 4.2.1.8 YES Triplexer Circuit is Ok See next page Similar? NO Check U101 Pin 7 PCS_PORT NO Check PCS MODE >=2.5 Signal Line & MSM YES Replace U101 Waveform Circuit Diagram PCS_PORT ANT_PORT Graph 4.2.1.8

  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 NO RF_IN Check C101, L103,VR100 Circuit Diagram Waveform RF_IN Graph 4.2.2.9

  27. 4.2.2.9. Check Mobile Switch Test Point Checking Flow Start Check U115, Pin2 RF_IN Refer to Graph4.2.2.9 Similar? YES Mobile Switch is OK NO Check C102, L104 RF_IN Circuit Diagram Waveform RF_IN Graph 4.2.2.9

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