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Trouble Shooting Guide, Advanced
16.2 How to find the fault
Phase and frequency error is a difficult measurement to perform, since the requirements on e.g.
instrument, cables and connections are very hard.
Therefore is fault usually due to shabby connections or bad cables at the test site.
If the phone really is faulty, open it and check for water damages.
No further action should be taken for a liquid damaged telephone.
Make sure the antenna connection is not damaged or dirty (dust, varnish or oxide).
The fault can also depend on a change in the characteristic of the transmitter, due to ageing or an
incorrect calibration.
Before you start to trouble shoot, perform a new radio calibration in EFRA and test the phone
again to eliminate this kind of fault.
Notice that the calibration demands test program in the phone while the Go/No Go –test
demands signal program.
The few times the fault is electrical, is it usually due to B510 or N401.
The fault can also be due to N570 for GSM 900 and N560 for GSM 1800.
4/00021-3/FEA 209 544/18 B
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