TSD
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Lv3Lv4 Repair Manual
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DCS 1800 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, C234, and C934.
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.
c.
Antenna pad
: all components on Tx path are good if power is measured
from antenna pad within 25dBm~32dBm. In this case, engineers shall go to
next debug process, general GSM Rx debug.
d.
L59
: Check whether GSM RF connector (CON6) is good or not. CON6
needs to be reworked if power is measured within 25dBm~ 32dBm on L59, and
no signal is measured from antenna pad. The following figure is an example of
L59 signal measurement on the spectrum analyzer.
e.
C234
: Check whether T/R switch (U902) is good or not. T/R switch
needs to be reworked if power is measured within 25dBm~ 32dBm on C228,
ASUS Proprietary
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Содержание M530w
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Страница 40: ...TSD Lv3Lv4 Repair Manual 華 華碩 碩電 電腦 腦 Power supply ASUS Proprietary 40 ...
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Страница 43: ...TSD Lv3Lv4 Repair Manual 華 華碩 碩電 電腦 腦 16 RF Block Diagram 16 1 GSM block diagram ASUS Proprietary 43 ...
Страница 44: ...TSD Lv3Lv4 Repair Manual 華 華碩 碩電 電腦 腦 16 2 WCDMA block diagram ASUS Proprietary 44 ...
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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