DC Power supply circuit 4.5 Media FLO Part Trouble Test Point Checking Flow START FLO TEST SETUP - Test Channel : 55 (719Mhz) - Sector Power : -50 dBm Spectrum Analyzer Setting Oscilloscope Setting 3. Check TCXO Circuit Re-download SW, CAL 1. Check DC Power supply circuit 2. Check RF Signal path

4.5.1 Checking DC Power supply Circuit Test Point Checking Flow +2.9V_Rx2 OK? Check Pin 15 of U702 U702. 21 NO The Problem may be Logic part Refer to Logic trouble shooting YES Check Pin 21 of U702 +2.6V_MSMP2 is OK? The Problem may be Logic part Refer to Logic trouble shooting YES NO U702. 15 DC Power supply Circuit is OK . See next Page to check RF Path. Figure 4.5.1.1 Circuit Diagram

RF Signal Path is OK . See next Page to check VCTCXO Circuit. 4.5.2 Checking RF Signal path Test Point Checking Flow Check U703 Pin 2 Check if there is Any Major Difference ◆ Refer to Graph 4.5.2.1 U703.2 Detected Signal? NO Changing U703 YES Check F701 Pin 1 Check if there is Any Major Difference ◆ Refer to Graph 4.5.2.1 Check C701 Check L701 Check C704 Check C713 Detected Signal? NO YES Check F701 Pin 3 Check if there is Any Major Difference ◆ Refer to Graph 4.5.2.2 Detected Signal? NO Changing F701 Figure 4.5.2.1 YES Check U702 Pin 7 Check if there is Any Major Difference ◆ Refer to Graph 4.5.2.2 Detected Signal? NO Check C714 Check L704 YES RF Signal Path is OK . See next Page to check VCTCXO Circuit. F701. 1 U702.7 F701. 3 Circuit Diagram Figure 4.5.2.2 Figure 4.1.1.3

Waveform Graph 4.5.2.1 Graph 4.5.2.2

4.5.3 Checking TCXO Circuit Test Point Checking Flow(TCXO) Waveform No Change X100 Check X100 Pin 3 ◆ Refer to Graph 4.5.3.1 Check X100 Pin 4 Similar? Yes The Problem may be Logic part Refer to Logic troubleshoot +2.8V OK? NO YES SW Download Replace Board X100. 3 Figure 4.5.3.1 Waveform Circuit Diagram Graph 4.5.3.1