Microsd Card Connector - Huawei U8185 Maintenance Manual

U8185
Maintenance Manual
Signal
USB_DM
USB_DP

9.4.9 microSD Card Connector

Figure 9-32 Circuit schematic diagram
Analysis
The U8185 supports 8 GB microSD cards. The power consumption of 512 MB and 256 MB
microSD cards is low, while the power consumption for microSD cards of 1 GB or higher is
comparatively high, which is normal. To increase RF capability, 33 pF capacitors are added to
all data lines.
Troubleshooting Process
Failure: The microSD card cannot be detected or read.
Issue 1.0 (2012-03-23)
Description
Digital signal
Digital signal
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
9 Principles and Failure Analysis
Reference Measurement or Wave Form
66