Figure 9-4 Troubleshooting Process For Weak Current - Huawei U8815 Maintenance Manual

U8815
Maintenance Manual

Figure 9-4 Troubleshooting process for weak current

6.
Figure 9-5 shows the troubleshooting process for high current.
Issue 1.0 (2012-02-13)
Power-on failure
Connect the handset
to a fake battery and
a maintenance power
supply and press On
to check the current.
Weak
current
Is the PM output
voltage normal?
Y
Measure and check
whether the output
frequency of X402 is
32.768 kHz or the output
of U3101 is 19.2 MHz.
Y
Return the
handset to the
factory for repair.
High current
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9 Principles and Failure Analysis
N
Check U201.
Re-solder or
N
replace X301
and U3101.
25