Asus P552W Manual page 83

The detail steps of debug are listed as follows.
a. Spectrum analyzer connects with a high impedance probe and
then execute Bluetooth or WLAN debug tool on GM2.
b. Use a multimeter to check that combo module (U804) is fed
correct voltage level.
c. Use the high impedance probe to sequentially measure RF
power of test points on Bluetooth and WLAN path, including
R1767, R1791, and C1711. Furthermore, BT/WLAN chip antenna
(U1702) is short (or very low resistance) status measured by a
multimeter at antenna's terminal pads. Corresponding locations of
test points are shown in "Bluetooth and WLAN 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 strength of each
point must refer to a golden sample under the same measurement
conditions. The results of measured RF signals on each test point
are showed in the following descriptions.
(a) Bluetooth
● R1791
Check whether combo module (U804) operates normally or not.
U804 needs to be replaced if improper RF power, no power or lower
power than that on the golden sample, is measured on R1791. The
following figure is an example of R1791 signal measurement on the
spectrum analyzer.
華 碩 電 腦
華 碩 電 腦
GTC ■ Service Manual
83