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華
碩
電
腦
華
碩
電
腦
PCS 1900 Rx debug
a. Set RF signal generator to emit CW with corresponding frequency and
transmit power into Halley GSM connector via a RF cable and a RF adapter
(MS-162). Spectrum analyzer connects with a high impedance probe. Execute
GSM debug tool and set parameters in the above table.
b. Use the high impedance probe to sequentially measure RF power of test
points on GSM Rx path, including L59, C889, and C887. Corresponding
locations are shown in "4. RF Tx/Rx Path and Test Points." Furthermore,
measurement error of RF power on each test point is unavoidable due to
measurement skills and methods of using high impedance probe. After probing
sequential test points, the probable defect component should be checked that
DC power is supplied for this component at proper voltage level.
c. L59: Check whether GSM RF connector (CON6) is good or not. CON6
needs to be reworked if no RF signal is measured on L59.
d. C889: Check whether T/R switch (U902) is good or not. T/R switch
needs to be reworked if RF signal emitted by the signal generator is measured
on L59, and no power is detected on C889. The following figure is an example
of C889 signal measurement on the spectrum analyzer.
TSD ■ Lv3Lv4 Repair Manual
75
ASUS Proprietary
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