Asus M530w Service Manual page 62

華 碩 電 腦
華 碩 電 腦
The purpose of this debug 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 "Debug tool". Debug tool makes Halley into test mode so that PA can
transmit power continuously.
The usage of debug tool can be referred to "Debug tool user guide"
provided by Halley ATS engineers. Related parameters of debug tool are
prescribed in the following table.
Channel
GSM 900 62
DCS 1800 700
PCS 1900 661
The detail steps of debug are listed as follows.
GSM 900 Tx debug
a. 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 Tx path, including antenna pad, L59, C228, and C917.
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.
TSD ■ Lv3Lv4 Repair Manual
PCL Tx Frequency
5 902.4 MHz
0 1747.8 MHz
0 1880.0 MHz
62
PAG_Valu
DAC1V
e
555 5200
560 5200
525 5200
ASUS Proprietary