1. 1 START Rx TEST SETUP(HHP) - Test Channel : 384 - Test Band : US Cellular - SID :22 - Sector Power : -30 dBm Spectrum Analyzer Setting Oscilloscope Setting 1. Check DC Power supply circuit 2. Check RF Signal path 3. Check TCXO Circuit 4. Check Control signal 5. Check Rx I/Q data Re-download SW, CAL 4.1.1 DCN RX Checking Flow Test Point 4.1 Rx Part Trouble CHAPTER 4. Trouble Shooting Figure 4.1.1.1

2. 2 4.1.1.1 Checking DC Power supply Circuit Circuit Diagram Test Point Checking Flow Check Pin 5 of U110 +2.9V_Rx OK? NO +2.6V_MSMP2 is OK? YES The Problem may be Logic part Refer to Logic trouble shooting Check Pin 48 of U110 YES NO U110. 5 U110. 48 The Problem may be Logic part Refer to Logic trouble shooting DC Power supply Circuit is OK. See next Page to check RF Path. Figure 4.1.1.2

3. 3 4.1.1.2 Checking RF Signal path Test Point Checking Flow U115. 2 Detected Signal? Check U115 Pin 2 Check if there is Any Major Difference ◆ Refer to Graph 4.1.1(a) NO Changing U115 U110. 23&24 YES Detected Signal? Check U101 Pin 2 Check if there is Any Major Difference ◆ Refer to Graph 4.1.1(a) NO Check C102 Check L104 DP100. 6 Check DP100 Pin 6 Check if there is Any Major Difference ◆ Refer to Graph 4.1.1(a) Detected Signal? YES NO Changing U101 Changing U141 Check C103 Check L105 Check L114 YES Detected Signal? Check U110Pin 33 Check if there is Any Major Difference ◆ Refer to Graph 4.1.1(b) U110. 33 NO Changing DP 100 Check C140& C142 & L119& L129 Detected Signal? NO Changing U110 Check L123 & C125 YES Check F102 Pin 1 Check if there is Any Major Difference ◆ Refer to Graph 4.1.1(c) F102. 1 Detected Signal? NO Changing F102 Check C148 & C149 Check L126 & L137 YES Check U110 Pin 23 Check U110 Pin 24 Check if there is Any Major Difference ◆ Refer to Graph 4.1.1(d) YES RF Signal Path is OK. See next Page to check VCTCXO Circuit. Figure 4.1.1.3 U101. 2

4. 4 Graph 4.1.1(c) Graph 4.1.1(d) Graph 4.1.1(b) Graph 4.1.1(a) Waveform

5. 5 4.1.1.3 Checking TCXO Circuit Test Point Graph 4.1.1(e) +2.8V OK? YES Checking Flow(TCXO) Similar? Waveform Check X100 Pin 3 ◆ Refer to Graph 4.1.1(e) Check X100 Pin 4 TCXO Circuit is OK. No NO The Problem may be Logic part Refer to Logic trouble shooting YES Changing X100 Check R110 Similar? Check X100 Pin 3 ◆ Refer to Graph 4.1.1(e) NO YES TCXO Circuit is OK. SW Download Replace Board Circuit Diagram Figure 4.1.1.4 X100, 4 X100, 3

6. 6 4.1.1.4 Checking Control signal Test Point Checking Flow Check Pin 51(SBCK), Pin 49(SBST) Pin 50(SBDT) of U110. Check if there is Any Major Difference ◆ Refer to Graph 4.1.1(g.h) Similar? NO YES Download the SW Control Signal is Ok See next Page to Check RX I&Q Data U110. 51U110. 50U110. 49 Figure 4.1.1.5 Similar? YES Control Signal is Ok See next Page to Check RX I&Q Data NO Replace Board Check Pin 51(SBCK), Pin 49(SBST) Pin 50(SBDT) of U110. Check if there is Any Major Difference ◆ Refer to Graph 4.1.1(g.h)

7. 7 Waveform SBCK SBST SBCK SBDT Graph 4.1.1(g) Graph 4.1.1(h) Circuit Diagram

8. 8 START Rx TEST SETUP(HHP) - Test Channel : 600 - Test Band : US PCS - SID :4182 - Sector Power : -30 dBm Spectrum Analyzer Setting Oscilloscope Setting 1. Check DC Power supply circuit 2. Check RF Signal path 3. Check TCXO Circuit 4. Check Control signal 5. Check Rx I/Q data Re-download SW, CAL 4.1.2 PCS RX Checking Flow Test Point Figure 4.1.2.1

9. 9 4.1.2.1 Checking DC Power supply Circuit Test Point Checking Flow Check Pin 5 of U110 +2.9V_Rx OK? NO +2.6V_MSMP2 is OK? YES The Problem may be Logic part Refer to Logic troubleshoot Check Pin 48 of U110 YES NO The Problem may be Logic part Refer to Logic troubleshoot DC Power supply Circuit is OK. See next Page to check RF Path. Circuit Diagram U110. 5 U110. 48 Figure 4.1.2.2

10. 10 4.1.2.2 Checking RF Signal path Test Point Checking Flow Detected Signal? Check U115 Pin 2 Check if there is Any Major Difference ◆ Refer to Graph 4.1.2(a) NO Changing U101 YES Detected Signal? Check U101 Pin 2 Check if there is Any Major Difference ◆ Refer to Graph 4.1.2(a) NO Check C102 Check L104 Check DP101 Pin 3 Check if there is Any Major Difference ◆ Refer to Graph 4.1.2(a) Detected Signal? YES NO Changing U101 Changing U142 Check C114 Check L151 YES Detected Signal? Check U110 Pin 31 Check if there is Any Major Difference ◆ Refer to Graph 4.1.2(b) NO Changing DP 101 Check C141 & L120, L130 Detected Signal? NO Changing U110 Check C128 Check C129, L126 YES Check F103 Pin 1 Check if there is Any Major Difference ◆ Refer to Graph 4.1.2(c) Detected Signal? NO Changing F103 Check C150, C154 Check L138, L139 YES Check U110 Pin 25 Check U110 Pin 26 Check if there is Any Major Difference ◆ Refer to Graph 4.1.2(d) YES RF Signal Path is OK. See next Page to check VCTCXO Circuit. Figure 4.1.2.3 U115. 2 U110. 25&26 DP101. 3 U110. 31 F103. 1 U101. 2

11. 11 Graph 4.1.2(c)Graph 4.1.2(d) Waveform Graph 4.1.2(a)Graph 4.1.2(b)

12. 12 4.1.2.3 Checking TCXO Circuit Graph 4.1.2(e) Figure 4.1.2.4 Test Point +2.8V OK? YES Checking Flow(TCXO) Similar? Waveform Check X100 Pin 3 ◆ Refer to Graph 4.1.2(e) Check X100 Pin 4 TCXO Circuit is OK. No NO The Problem may be Logic part Refer to Logic troubleshoot YES Changing X100 Check R110 Similar? Check X100 Pin 3 ◆ Refer to Graph 4.1.2(e) NO YES TCXO Circuit is OK. SW Download Replace Board Circuit Diagram X100, 4 X100, 3

13. 13 4.1.2.4 Checking Control signal Figure 4.1.2.5 Test Point Checking Flow Check Pin 51(SBCK), Pin 49(SBST) Pin 50(SBDT) of U110. Check if there is Any Major Difference ◆ Refer to Graph 4.1.2(g.h) Similar? NO YES Download the SW Control Signal is Ok See next Page to Check RX I&Q Data U110. 51U110. 50U110. 49 Similar? YES Control Signal is Ok See next Page to Check RX I&Q Data NO Replace Board Check Pin 51(SBCK), Pin 49(SBST) Pin 50(SBDT) of U110. Check if there is Any Major Difference ◆ Refer to Graph 4.1.2(g.h)

14. 14 Waveform SBCK SBST SBCK SBDT Graph 4.1.2(g) Graph 4.1.2(h) Circuit Diagram