S8 GSM
Table of contents
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Information and Communication
Communication Devices
E10 / S6 Power GSM /S8 GSM
Level 2.5
Repair Documentation
V 1.2
V1.2 Page 1 of 23 ICP CD ST
D. Schnoor
06/98
Information and Communication
Communication Devices
Table of Contents:
1 INTRODUCTION................................................................................................................................................2
2 VCXO
...................................................................................................................................................................................3
3 FUSE 1A
...................................................................................................................................................................................8
4 FUSE 0.25 A
.................................................................................................................................................................................12
5 MOLEX CONNECTOR
.................................................................................................................................................................................16
6 RINGER
.................................................................................................................................................................................20
1Introduction
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Information and Communication
Communication Devices
This manual is intended to help you carry out repairs on level 2.5, meaning limited
component repairs. Failure highlights are documented and should be repaired in the local
workshops.
The E10 and the S6 Power GSM are both handsets for GSM-900. Internally they are almost
identical but the form factors of the boards are different.
Note: In some countries the S6 Power GSM is called S6 Classic!
It must be noted that all repairs have to be carried out in an environment set up according to
the ESD (Electrostatic Discharge Sensitive Devices) regulations defined in international
standards.
If you have any questions regarding the repair procedures or spare parts do not hesitate to
contact our technical support team in Kamp-Lintfort, Germany:
Tel.: +49 2842 95 4666
Fax: +49 2842 95 4302
e-mail: dominik.schnoor@klf.siemens.de
2VCXO
2.1Affected Units
2.1.1Type: E10 / S6 Power GSM
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Information and Communication
Communication Devices
2.1.2Affected IMEIs / Date Codes: All / All
2.1.3Affected SW-Versions: All
2.1.4Fault Code for LSO reporting: 3VCX
2.2Fault Description
2.2.1Fault Symptoms for customers:
Network Search
Handset not logging into network
2.2.2Fault Symptom on GSM-Tester:
Frequency error in synchronized mode >90 Hz
No location update possible
The VCXO (Voltage Controlled Crystal Oscillator) is responsible for generating the
13 MHz reference frequency of the handset.
If it is defective, the handset cannot synchronize to the base station anymore.
2.3Priority:
........ Mandatory
........ Repair
........ Optional
........ Not Yet Defined
2.4Repair Documentation
2.4.1Description of procedure:
2.4.1.1Diagnosis
Check the output frequency of the VCXO using the level-2 testing
program for E10 / S6 Power GSM.
Switch off the „CMD in Use“ option in the S611.INI file and restart
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Information and Communication
Communication Devices
the program. Start the test, when the program says „Check power and
phase of external antenna with your GSM-Tester“, switch the CMD to
„LOCAL“ mode and enter the „MODULE TEST“.
On the CMD display you can see the frequency error of the handset.
(Make sure that the CMD is on channel 124, power level 5!)
If the frequency error is higher than 2kHz, the VCXO has to be
replaced.
2.4.1.2Repair by component change
Use hot air blower to remove defective VCXO.
Avoid excessive heat!
Watch surrounding components!
Resolder new VCXO afterwards.
2.4.1.3Repair by SW-Booting
Not possible!
2.4.1.4Test
Retest handset after repair as described above.
The frequency error must now be < 2kHz.
2.4.2List of needed material
2.4.2.1Components
VCXO
Part-Number: L36145-G300-Y19
2.4.2.2 Jigs and Tools
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Information and Communication
Communication Devices
Hot Air Blower
Soldering Iron
2.4.2.3Special Tools
None
2.4.2.4Working materials
Desolder Wick / Braid
Solder
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Information and Communication
Communication Devices
2.4.3Drawings
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Figure 1: E10 / S6 Power GSM Board VCXO Side
Figure 2: VCXO (Z601) Placement (Top View)
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