Asus P552W Manual page 76

The purpose of Rx 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 "RF Debug tool". Debug tool
enforces GM2 into test mode so that GM2 can keep receiving CW,
continuous wave, from a signal generator. Related parameters of
debug tool are prescribed in the following table.
The detail steps of debug are listed as follows.
a. Set a signal generator to emit CW with corresponding
frequency and power into GM2 RF connector (CON1801) 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 a multimeter to check that each component on Rx 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 generated by the signal generator of test points on
WCDMA Rx path, including C1806, C1824, C1943, and L1911.
Corresponding locations of test points are shown in "i. WCDMA
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
華 碩 電 腦
華 碩 電 腦
GTC ■ Service Manual
76