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Table of Contents
L3 Radiated Troubleshooting Guide XT1225/XT1254
1
21
PAGE
OF
PAGES
Table of Contents
Diversity Antenna ................................................... 2
BT/WiFi ................................................................. 6
GPS .................................................................... 12
Main Antenna ...................................................... 16
Motorola Mobility Inc. Confidential Restricted
v1.0
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Summary of Contents for Motorola XT1225
- Page 1 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Table of Contents Diversity Antenna …………………...…….…………….…. 2 BT/WiFi ……………………………………….……..….……. 6 GPS ……………………………………….………..….……. 12 Main Antenna ………………………….………….………. 16 Motorola Mobility Inc. Confidential Restricted v1.0...
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Page 2: Diversity Antenna
L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Diversity Antenna Motorola Mobility Inc. Confidential Restricted v1.0... - Page 3 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Objective / Purpose: ● Studying radiated failures and providing procedure for debugging the failures ● The following tests from RADTEST section of the NTF_Pareto document will be discussed Here are the Verizon SKU Failure List (Secondary, C3): Verizon Secondary •...
- Page 4 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Step 3: If Step 2 does not resolve the problem check if components RefDes = L850, L899, L852, L854, C856, L855, C855, L857, L858, L898 and C860 are placed correctly on PCB as shown below in figures 2 and 3.
- Page 5 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Figure 3: Secondary antenna matching components schematic Step 4: If Step 3 does not resolve the problem, check if the ground clips M013 are placed on the board and making contact as shown in Figure 4.
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Page 6: Bt/Wifi
L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES BT/WiFi Motorola Mobility Inc. Confidential Restricted v1.0... - Page 7 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Objective / Purpose: ● This document helps debug Bluetooth and 2.4 GHz / 5 GHz WIFI factory radiated test failures. Setup: ● Schematic ● PCB Layout Ant. c ontact C015 ...
- Page 8 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Analysis: ● Bluetooth / WiFi 2.4GHz ○ BT_RAD_MEAS_CW_POW_CH_00 ○ WLAN_2.4GHZ_RAD_MEAS_CW_POW_LCH01 ○ WLAN_2.4GHZ_RAD_MEAS_CW_POW_HCH13 ○ WLAN_2.4GHZ_RAD_MEAS_CW_POW_MCH06 Step 1: Retest Step 2: Check for cracks in the WiFi antenna pattern Check a ntenna c racking ...
- Page 9 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Check a ntenna c ontact C c lip Step 4: Check if antenna is matching components RefDes C014 (0 ohm), C015 and L016 are intact. Ant. c ontact ...
- Page 10 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Step 5: Check if PCB to chassis grounding M0019 intact and making good contact. Motorola Mobility Inc. Confidential Restricted v1.0...
- Page 11 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES ● WiFi 5GHz WLAN_5.0GHZ_RAD_MEAS_CW_POW_ LCH165 LCH149 LCH165_CL STATUS_LCH149 LCH149_CL LCH036_MID LCH036_CL When 5 GHz radiated Wi-Fi test failed, most likely it is conducted problem, if conducted circuit was confirmed to be good, please follow the same steps as Wi-Fi 2.4G to debug.
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Page 12: Gps
L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Motorola Mobility Inc. Confidential Restricted v1.0... - Page 13 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Objective / Purpose: This document helps debug GPS factory radiated test failures ○ GPS_CARRIER_TO_NOISE Setup: ● Schematic ● PCB Layout L056 Motorola Mobility Inc. Confidential Restricted v1.0...
- Page 14 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Analysis: Step 1: Retest Step 2: check for cracks in the GPS antenna pattern Cracks will only be visible under a microscope. A known “good” top carrier should be placed and the phone should be re-tested.
- Page 15 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Step 5: If the Carrier-to-noise is several dB lower than the spec, check if the PCB around the hole has crack or not. Step 6: If the C/N is more than 15dB lower than spec, check if the RF connector is aligned with solder pads and if the center pin soldered well.
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Page 16: Main Antenna
L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Main Antenna Motorola Mobility Inc. Confidential Restricted v1.0... - Page 17 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Objective / Purpose: ● Studying radiated main antenna failures and providing procedure for debugging the failures ● The following tests from AUDIORAD station Here are the various test cases for the Verizon SKU Failure List (Primary, C2): Verizon Primary ●...
- Page 18 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Step 3: if Step 2 does not resolve issue, check if universal contact (RefDes = M650) on the PCB is damaged. Is it touching the antenna pad? If the universal clip is twisted or not making contact,...
- Page 19 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES ● If all intact and soldered well, check: C651, L655, C670, C653, L652, L651, C107, U630, U651, R9008, and R9009 ● QC_CDMA_800_C0_RAD_RSSI_HCH ● First check: C107, U651, R9009, L652, L655, L663, C656, L656, C654 ●...
- Page 20 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Figure 2: Main Antenna matching components overlay – Rear components Motorola Mobility Inc. Confidential Restricted v1.0...
- Page 21 L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE PAGES Figure 3: Main Antenna matching components overlay – Front components Motorola Mobility Inc. Confidential Restricted v1.0...
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