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1 Explanations
1.1
Conditions
All measurements described in this Trouble Shooting Guide are performed in EFRA with test
program in the phone.
Some of the faults can occur in tests without test program, e.g. Go/No Go -tests.
In these cases you have to program the phone with test program before starting to trouble shoot
using this guide.
For trouble shooting with signal program see doc. 4/00021-2/FEA 209 544/18.
In case of liquid damage no further action should be taken, handle the unit according to the local
company directives.
The classification of the components and a possible demand of current-, BData-, ADC- and
radio-calibration when changing a component are mentioned in separate documents.
There are four different calibrations: current-, BData-, ADC- and radio-calibrations
Current-, BData- and ADC-calibration are performed in the trouble shooting part of EFRA,
while radio- calibration can be found under the icon "Calibrate".
Some replaces of component demands all four calibrations, other only need one or two of the
calibrations.
For component placing see doc. 1078-2/FEA 209 544/18
Precautions:
DC voltage measurements must be done with a probe with at least 100 Kohm and 30 pF
impedance to ground.
For best possible accuracy, use the 20 dB probe attenuator when testing 900/1800 MHz signals.
Accuracy for input test signals:
Voltage ± 1%
Current ± 5%
Frequency ± 5%
4/00021-3/FEA 209 544/18 B
Trouble Shooting Guide, Advanced
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