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U8185
Maintenance Manual
Figure 9-21 Vibration failure
Table 9-4 Circuit diagram signal summary
Signal
VPH_PWR
VIB_DRV_N
9.4.4 Voice Reception
Figure 9-22 Circuit schematic diagram
Issue 1.0 (2012-03-23)
Vibration failure
Re-install the software. Problem
solved?
N
Is the motor not soldered properly?
N
Is the motor pad's power supply equal
to the battery voltage? When the
motor test starts, is the negative
electrode of the motor at low level?
N
Replace the motor. Problem solved?
N
Send the phone to an
advanced service site for
repair
Description
Main power supply, supplying power
to the motor
Motor drive signal pin, connected to
the motor's negative electrode
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Copyright © Huawei Technologies Co., Ltd.
9 Principles and Failure Analysis
Y
End
Re-solder the motor
Y
and verify its function
End
The power supply is
Y
normal. Further
analysis is required.
Y
End
Reference Measurement
or Wave Form
None.
None.
54
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