Motorola XT1225, XT1254 Troubleshooting Guide

L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE 1 OF 21 PAGES

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Table of Contents

Diversity Antenna …………………...…….…………….…. 2

BT/WiFi ……………………………………….……..….……. 6

GPS ……………………………………….………..….……. 12

Main Antenna ………………………….………….………. 16

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Diversity Antenna

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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

• QC_LTE_BC7_C1_RX_RAD_RSSI_HCH3400

• QC_LTE_BC13_C1_RX_RAD_RSSI_LCH5184

• QC_CDMA_800_C1_RAD_RSSI_HCH

• QC_CDMA_1900_C1_RAD_RSSI_HCH

Verizon CDMA Primary

For factory radiated test failure on secondary path (Note C1 in the test code), please do the following:

Step 1: Retest

Step 2: If Step 1 does not resolve issue, check if universal contact (RefDes = M850) on the PCB

is damaged. Is it touching the antenna pad? If the universal clip is twisted or not making contact,

this needs to be replaced:

Figure 1: Universal contact for secondary antenna

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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.

Figure 2: Antenna matching components, universal clip, & RF connector for secondary

antenna

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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.

Figure 4: Bottom Ground Clip On the PCB

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BT/WiFi

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Objective / Purpose:

● This document helps debug Bluetooth and 2.4 GHz / 5 GHz WIFI factory radiated test failures.

Setup:

● Schematic

● PCB Layout

● The following list are the tests from RADTEST section of the NTF_Pareto document

! WLAN_5.0GHZ_RAD_MEAS_CW_POW_LCH165

! WLAN_5.0GHZ_RAD_MEAS_CW_POW_LCH149

! WLAN_5.0GHZ_RAD_MEAS_CW_POW_LCH165_CL

! WLAN_5.0GHZ_RAD_MEAS_POW_STATUS_LCH149

! WLAN_5.0GHZ_RAD_MEAS_CW_POW_LCH149_CL

! WLAN_2.4GHZ_RAD_MEAS_CW_POW_LCH01

! WLAN_2.4GHZ_RAD_MEAS_CW_POW_HCH13

! WLAN_5.0GHZ_RAD_MEAS_CW_POW_LCH036_CL

! WLAN_2.4GHZ_RAD_MEAS_CW_POW_MCH06

! WLAN_5.0GHZ_RAD_MEAS_CW_POW_LCH036_MID

Ant.%contact%

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