2. Mobile Maintenance Guide
In mobile circuit system, all lines can be divided into three types: power supply line,
control line and signal line. When analyze fault, for active device, we can check power
supply line first, and then check control line, at last check signal line, expel fault step by
step. During maintenance, if you encounter failure probability of 100%, please contact the
hardware and software engineers of project in the first time, so problems can be quickly
resolved.
PCBA positive and negative diagram is as below:
2-1 PCBA positive diagram
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