Asus M530w, Service Manual

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The purpose of this debug process is to find out where the problem is on
WCDMA 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.
DL Channel Rx Frequency
Generator
Power
WCDMA 10700 2140.0 MHz -30 dBm
The detail steps of debug are listed as follows.
a. Set RF signal generator to emit CW with corresponding frequency and
transmit power into Halley WCDMA connector via a RF cable and a RF
adapter (MS-162). Spectrum analyzer connects with a high impedance probe.
Execute WCDMA debug tool and set parameters in the above table.
b. Use the high impedance probe to sequentially measure RF power of test
points on WCDMA Rx path, including C972, C990, C980 and L867.
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. C972 : Check whether WCDMA RF connector (CON7) is good or not.
CON7 needs to be reworked if no RF signal is measured on C972. The
following figure is an example of C972 signal measurement on the spectrum
analyzer.
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