Asus P552W Manual page 49

The purpose of Tx debug process is to find out where the problem
is on GSM Tx path. In other words, engineers can judge the defect
component on RF path by using "RF Debug tool". Debug tool
enforces GM2 into test mode so that RF signal can be transmitted
continuously. Related parameters of debug tool are prescribed in the
following table.
The detail steps of debug are listed as follows.
a. Spectrum analyzer connects with a high impedance probe.
Execute WCDMA debug tool and set parameters in the above
table.
b. Use a multimeter to check that each component on Tx path is
fed correct voltage level. The following table shows component's
location number, DC test point, and typical voltage level.
c. Use the high impedance probe to sequentially measure RF
power of test points on GSM/DCS/PCS Tx path, including C1842,
C1844, C1836, C1839, C1806, and R1833. Corresponding
locations of test points are shown in "i. GSM path and test
points." Measurement error of RF power on each test point is
unavoidable due to measurement skills and operating methods of
using high impedance probe. Moreover, measured RF signal
華 碩 電 腦
華 碩 電 腦
GTC ■ Service Manual
49