Gps Channel; Wi-Fi Channel - Huawei G700-U10 Maintenance Manual

Table of Contents

G700-U10 Smartphone

Maintenance Manual

10.3.4 GPS Channel

Circuit Diagram

Figure 10-25 GPS channel

Circuit Analysis

The GPS signals pass through the antenna and a group of the matching circuit and enter the

SAW filter. The signals are then amplified by a low noise amplifier and enter the MT6628Q.

Troubleshooting Process

If no GPS signals can be received by the phone, first check whether the antenna and antenna

springs are properly connected. If yes, check whether the LNA back end has signals (the GPS

module has no RF switch, use an RF cable for the inspection). If not, replace the LNA. If the

circuit has no missing component but the problem persists, return the phone to Huawei for

repair.

Circuit Diagram

Figure 10-26 Wi-Fi channel

Circuit Analysis

The Wi-Fi signals pass through the antenna and a filter and enter the balun in the shielding

case. After this, the signals become differential signals and enter the MT6628Q.

Issue 1.0 (2013-07-22)

Huawei Proprietary and Confidential

10 Circuit and Failure Analysis

Table of Contents