Figure 4-13 Working Principles Of The Headset Circuit - Huawei MediaPad 10 fhd Maintenance Manual

MediaPad10 FHD Maintenance Manual

Figure 4-13 Working principles of the headset circuit

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Circuit analysis
The PMU outputs headset signals to the headset power amplifier U1501. After being
amplified by the U1501, the signals reach a small headset board through the FPC jack
J1500.
The power of the U1501 is supplied by the VPH_PWR pin. A step-up circuit is designed
inside the U1501 to ensure that the output signals of the headset are not distorted under
different voltage conditions. The signals output by the U1501 are sent to a BTB jack and
then reach a small headset board through the FPC jack. Finally, the signals are output to
the headset.
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Fault analysis and location
2012-10-09 Huawei Confidential
INTERNAL
Page 54 of 78