Trouble Shooting Guide, Advanced
4/00021-3/FEA 209 544/25 C
Ericsson Mobile Communications AB
Approved according to 1776-1/FEA 209 544
Trouble Shooting Guide, Advanced
ApplicableforA2618s by Toko (toko@gsm-free.org)
Contents
1 Explanations .........................................................................................................................2
2 On/Off, Enter Test Program ...............................................................................................6
3 EPROM...............................................................................................................................10
4 ADC-Calibration (Voltage-Calibration) ..........................................................................12
5 BDATA-Calibration...........................................................................................................15
6 Current Calibration...........................................................................................................16
7 Network Problems..............................................................................................................20
8 LO Fault..............................................................................................................................30
9 VCXO..................................................................................................................................32
10 RSSI.....................................................................................................................................34
11 Phase and Frequency Error ..............................................................................................36
12 Transient Spectrum (Spectrum due to switching)...........................................................38
13 Modulation Spectrum Switched Mode (Spectrum due to Modulation) .......................42
14 Burst Timing (Power Time Template) .............................................................................50
15 Calibration Intermediate Power.......................................................................................52
16 Calibration Power Level....................................................................................................53
17 Audio ...................................................................................................................................56
18 Keyboard.............................................................................................................................65
19 Display.................................................................................................................................67
20 Buzzer..................................................................................................................................69
21 Illumination.........................................................................................................................70
22 Top Indicator......................................................................................................................71
23 SIM-Fault (“Insert Card”)................................................................................................72
24 Self-Test...............................................................................................................................75
25 ADC-Values ........................................................................................................................77
26 Revision History .................................................................................................................78
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