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Service Manual
49
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The purpose of Tx debug process 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 “RF Debug tool”. Debug tool
enforces GM2 into test mode so that RF signal can be transmitted
continuously. Related parameters of debug tool are prescribed in the
following table.
The detail steps of debug are listed as follows.
a. 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 Tx 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 of test points on GSM/DCS/PCS Tx path, including C1842,
C1844, C1836, C1839, C1806, and R1833. Corresponding
locations of test points are shown in “i. GSM 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 signal
Summary of Contents for P552W
Page 1: ...GTC Service Manual 1 華 華碩 碩電 電腦 腦 P552W Level 3 4 Trouble Shooting Guide Ver 1 0 ...
Page 5: ...GTC Service Manual 5 華 華碩 碩電 電腦 腦 1 OVERVIEW 1 1 System Block Diagram ...
Page 6: ...GTC Service Manual 6 華 華碩 碩電 電腦 腦 1 2 power on sequence 1 2 1 Start up Timing Diagram ...
Page 13: ...GTC Service Manual 13 華 華碩 碩電 電腦 腦 1 5 On Board Major Components Location 1 5 1 FRAON SIDE ...
Page 14: ...GTC Service Manual 14 華 華碩 碩電 電腦 腦 1 5 2 BACKT SIDE ...
Page 15: ...GTC Service Manual 15 華 華碩 碩電 電腦 腦 ...
Page 16: ...GTC Service Manual 16 華 華碩 碩電 電腦 腦 1 6 Debugging Equipments Oscilloscope Soldering Iron ...
Page 17: ...GTC Service Manual 17 華 華碩 碩電 電腦 腦 Power Supply Reheat fan ...
Page 18: ...GTC Service Manual 18 華 華碩 碩電 電腦 腦 Voltmeter ...
Page 37: ...GTC Service Manual 37 華 華碩 碩電 電腦 腦 3 2 RF Block Diagram 3 2 1 GSM block diagram ...
Page 38: ...GTC Service Manual 38 華 華碩 碩電 電腦 腦 3 2 2 WCDMA block diagram ...
Page 39: ...GTC Service Manual 39 華 華碩 碩電 電腦 腦 3 2 3 Bluetooth and WLAN block diagram ...
Page 41: ...GTC Service Manual 41 華 華碩 碩電 電腦 腦 ...
Page 46: ...GTC Service Manual 46 華 華碩 碩電 電腦 腦 ...
Page 47: ...GTC Service Manual 47 華 華碩 碩電 電腦 腦 GSM test points ...
Page 51: ...GTC Service Manual 51 華 華碩 碩電 電腦 腦 DCS1800 PCS1900 ...
Page 53: ...GTC Service Manual 53 華 華碩 碩電 電腦 腦 DCS1800 PCS1900 ...
Page 55: ...GTC Service Manual 55 華 華碩 碩電 電腦 腦 DCS1800 PCS1900 ...
Page 57: ...GTC Service Manual 57 華 華碩 碩電 電腦 腦 DCS1800 PCS1900 ...
Page 61: ...GTC Service Manual 61 華 華碩 碩電 電腦 腦 GSM1800 GSM1900 ...
Page 63: ...GTC Service Manual 63 華 華碩 碩電 電腦 腦 GSM1800 GSM1900 ...
Page 65: ...GTC Service Manual 65 華 華碩 碩電 電腦 腦 ...
Page 66: ...GTC Service Manual 66 華 華碩 碩電 電腦 腦 WCDMA test points ...
Page 81: ...GTC Service Manual 81 華 華碩 碩電 電腦 腦 Bluetooth and WLAN test points ...
Page 87: ...GTC Service Manual 87 華 華碩 碩電 電腦 腦 ...
Page 88: ...GTC Service Manual 88 華 華碩 碩電 電腦 腦 GPS test points ...
Page 90: ...GTC Service Manual 90 華 華碩 碩電 電腦 腦 ...
Page 91: ...GTC Service Manual 91 華 華碩 碩電 電腦 腦 ...
Page 92: ...GTC Service Manual 92 華 華碩 碩電 電腦 腦 ...
Page 117: ...GTC Service Manual 117 華 華碩 碩電 電腦 腦 Step9 Press Exit ...