I/O Interface Circuit - Huawei G510 Maintenance Manual

9.4.7 I/O Interface Circuit

Circuit Diagram
Figure 9-39 shows the circuit diagram of the I/O interface.
Figure 9-39 Circuit diagram of the I/O interface
Analysis
When a charger is connected to the I/O interface, the charger provides the VCHG charging
voltage to charge the battery. When a data cable is connected to the I/O interface,
USB_HS_DN and USB_HS_DP are used for communication between the G510 and computer
(to upgrade the software and read the G510's information).
Troubleshooting
Fault symptom: The I/O interface is faulty, and the battery fails to be charged.
Handling: Clean, re-solder, or replace the interface.
Circuit Symbols
Signal Symbol
VCHG
USB_DM
USB_DP
2013-01-28
G510 Maintenance Manual V1.0
NOTE
The TVS is used to provide the ESD and surge protection due to a large number of SIM card operations.
Description
Charger power input
Digital signal
Digital signal
Huawei Confidential
Reference Measurement or Waveform
High level, 5 V
None
None
INTERNAL
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