I/O Connector - Huawei U8185 Maintenance Manual

U8185
Maintenance Manual
Signal
UIM1_CLK
UIM1_CLK_ESD

9.4.8 I/O Connector

Figure 9-31 Circuit schematic diagram
Analysis
When being connected to the I/O connector, a charger provides the VCHG charging voltage to
charge the battery. When the phone is connected to a computer using a USB cable,
USB_HS_DN and USB_HS_DP are used for communication between the phone and the
computer (for example upgrading the phone's software or reading information from the
phone).
Troubleshooting Process
Failure: The phone cannot be charged or detected by a computer.
Solution: Clean, re-solder or replace the USB connector.
Table 9-7 Circuit diagram signal summary
Signal
VCHG
Issue 1.0 (2012-03-23)
Description
UIM card clock
 ESD protection for the UIM
card clock signal

Connected to the ESD
protection component D606
Description
Charging
input
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Reference Measurement or Wave Form
None.
Reference Measurement or Wave Form
current High level, 5 V
9 Principles and Failure Analysis
65