Huawei G510 Maintenance Manual page 37

If the G510 fails to be powered on, observe the DC current upon power-on to identify the
fault.
Figure 9-4, Figure 9-5, and Figure 9-6 show the fault identification processes upon no current,
weak current, and strong current.
Figure 9-4 Fault identification process upon no current
2013-01-28
G510 Maintenance Manual V1.0
The U8825-1 fails to
be powered on.
Install a simulated battery on the
U8825-1, connect the U8825-1 to the
maintenance power, press the power
key, and observe the current.
There is no
current.
Is the copper sheet of
the power key
oxidized?
N
Is the VPH_PWR voltage normal?
(The maintenance power voltage
ranges from 3.4 V to 4.2 V in
normal cases.)
Y
Is the clock normal?
Y
Return the U8825-1 to
Huawei for repair.
Huawei Confidential
Y
N
N
Check X401 and U3101
of the clock.
INTERNAL
Clean the power
key.
Check U201.
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