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Lv3Lv4 Repair Manual
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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
PCL
Tx
Frequency
PAG_Valu
e
DAC1V
GSM 900
62 5 902.4
MHz 555 5200
DCS 1800
700 0 1747.8
MHz 560 5200
PCS 1900
661 0 1880.0
MHz 525 5200
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.
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Содержание M530w
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Страница 47: ...TSD Lv3Lv4 Repair Manual 華 華碩 碩電 電腦 腦 GSM Tx Rx test points ASUS Proprietary 47 ...
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