Huawei Y300 Maintenance Manual page 38

Y300 Maintenance Manual
Figure 9-6 Fault identification process upon weak current
Issue 1.0 (2013-01-24)
The Y300 fails to be
powered on.
Install a simulated battery on the
Y300, connect the Y300 to the
maintenance power, press the
power key, and observe the
current.
The current is weak.
Is the voltage
provided by the
PM8029 normal?
Y
Is the output frequency of the
X301 equal to 32.768 kHz or
that of the U3101 equal to 19.2
MHz?
Y
Return the Y300 to
Huawei for repair.
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9 Principles and Failure Analysis
N
Check the U201.
N
Re-solder or replace the
X301, U3101, and U1800.
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