Nokia 6021 Service Manual
RM-94
Nokia Customer Care
6(b) - RF Troubleshooting
12
COMPANY CONFIDENTIAL
Issue 1 04/2005
Copyright © 2005 Nokia. All Rights Reserved.
RSSIreading [dBm] = 20log(U
BB
/U
LSB
) - AGC
calibrated
In order to check the levels and frequencies of RF signals, the following probe can be used
(note that only the core lead contacts the test point, the shielding of the coaxial cable does not
contact GND during the measurement):
(note that only the core lead contacts the test point, the shielding of the coaxial cable does not
contact GND during the measurement):
Connect this probe via a coaxial cable and a DC block to a spectrum analyzer. The DC block
is important to protect the spectrum analyzer from DC levels, which superpose the RF signal
at several test points.
is important to protect the spectrum analyzer from DC levels, which superpose the RF signal
at several test points.
If both RX and TX path seem to be faulty, it has to be checked if the synthesizer is working.