Asus M530w Service Manual page 71

華 碩 電 腦
華 碩 電 腦
The purpose of this debug process is to find out where the problem is on
GSM Rx path. In other words, engineers can judge the defect component on RF
path by using "Debug tool" and RF signal generator. Debug tool makes Halley
into test mode and keeps Rx path receiving CW (continuous wave) from the
generator.
The usage of debug tool can be referred to "Debug tool user guide"
provided by Halley ATS engineers. Related parameters of debug tool and
recommended output power from the generator are prescribed in the following
table.
GSM 900
DCS 1800
PCS 1900
The detail steps of debug are listed as follows.
GSM 900 Rx debug
a. Set RF signal generator to emit CW with corresponding frequency and
transmit power into Halley GSM connector via 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, C869, and C868. 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.
Channel Rx Frequency
62 947.4 MHz
700 1842.8 MHz
661 1960.0 MHz
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TSD ■ Lv3Lv4 Repair Manual
Generator power
-20 dBm
-20 dBm
-20 dBm
ASUS Proprietary