Huawei MediaPad 10 fhd Maintenance Manual page 71

MediaPad10 FHD Maintenance Manual
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Send the module to software or hardware engineers for processing.
Common Faults of the Bluetooth Module
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Common Faults of the Wi-Fi Module
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2012-10-09
− WCDMA transmit links are faulty.
The crystal oscillator is faulty.
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WCDMA TRX calibration failure
− Check whether the WCDMA transmit power is normal. In most cases, soldering
errors may exist on transmit links.
− Check whether the PD link is normal.
− Check whether the RX link is normal.
− Check whether the DRX link is normal.
GSM or EDGE TX calibration failure
Check whether the GSM PA is properly soldered.
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− Check whether the power supply and the control unit of the GSM PA are normal.
Software version access failure or port enabling failure
WCDMA inloop failure
− Test the CT and Bluetooth again by using the same production test equipment, and
then check whether the test result is normal.
− If the fault persists, replace the PA of the respective frequency band and test the CT
and Bluetooth again.
WCDMA and GSM sensitivity test failure
− Check whether environmental interference exists because the shielding box is
uncovered or shielding measures are not taken.
− Check whether SMT defects exist on receive links.
Software version access failure or port enabling failure
− Send the module to software or hardware engineers for processing.
Serious packet loss in the receive direction
− Check whether environmental interference exists.
− Check whether SMT defects exist on receive links.
Check whether SMT defects exist on the Wi-Fi chip.
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− Check whether the Wi-Fi chip is faulty.
Small transmit power or poor EVM
Check whether the production test equipment is improperly calibrated, whether line
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loss is correct, and whether the voltage standing wave ratio (VSWR) and impedance
of the test environment meet related requirements.
− Check whether fixtures are fastened and thimbles are in good contact. Thimbles may
be defective as they are used time and again.
− Check whether SMT defects exist on transmit links.
− Check whether SMT defects exist on the Wi-Fi chip.
Check whether the Wi-Fi chip is faulty.
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Software version access failure or port enabling failure
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