2.14 Wireless LAN Troubleshooting 2 Troubleshooting
Procedure 3 Antenna Check
Use an antenna test cable to check the antennas' connection. Follow the steps below.
Any of the connections may be disconnected. Disassemble the computer following the steps
described in Chapter 4, perform the following checks
1. Disconnect the wireless LAN antenna (white and black) from the wireless LAN
board.
2. Connect the tester set up for impedance measurement to the antenna jig.
Measure the white antenna’s resistance
3. Determine the resistance. The antenna passes the test when the resistance is
less than 5Ω. If it is more than 5Ω, the antenna is faulty.
4. Measure the black antenna’s resistance. Check if there is faulty.
Figure 2-4 Antenna Test jig
Measurement Value Pass/fail Comment
Less than 5Ω Pass Include cable loss
More than 5Ω Fail The digital tester shows 0L ,etc. if there is a broken wire.
NOTE: 1. The resistances determined with the steps above may not be stable according
to the length of the antenna. The impedance of the antenna itself is about 0.5-
0.8
Ω
.
2. The above steps cannot accurately determine the impedance of the antenna.
Use an LC meter for a precise measure of impedance.
If each wireless antenna pass the above test, return the Wireless LAN module back, then
perform Procedure 1.
If the wireless LAN has still an error, go to Procedure 4.
PORTEGE R100 Maintenance Manual (960-440) 2-49