Siemens C25(88) Service Manual
Information and Communication Products
Communication Devices
C25(88)
Level 2.5
Repair Documentation
V 1.2
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Information and Communication Products
Communication Devices
1Introduction
The C25 is the first dualband handset (GSM-900 and GSM-1800) in the C-class.
The C2588 is a special version for the asian market featuring a graphic display instead of
the alphanumeric C25 display.
The repairs for C25 and C2588 are identical unless otherwise noted.
Lately a new version of the C25 has been introduced. This version has the main processor
HiGold version 4.3 of the S25(88). Internally this C25 is therefore called C25V4. The level
2.5 parts are identical to the old C25 version.
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.
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
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Information and Communication Products
Communication Devices
Table of Contents:
1 INTRODUCTION................................................................................................................................................2
2 ANTENNA CONNECTOR
...................................................................................................................................................................................4
3 RINGER CONNECTOR
...................................................................................................................................................................................8
4 BOTTOM CONNECTOR (LUMBERG)
.................................................................................................................................................................................11
5 18ΜH COIL
.................................................................................................................................................................................14
6 ANTENNA SPRING
.................................................................................................................................................................................18
7 DISPLAY CONNECTOR
.................................................................................................................................................................................21
8 DISPLAY CAPACITORS
.................................................................................................................................................................................26
9 RINGER COIL
.................................................................................................................................................................................30
10 KEYPAD LEDS
.................................................................................................................................................................................33
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Information and Communication Products
Communication Devices
2Antenna Connector
2.1Affected Units
2.1.1Type: C25
2.1.2Affected IMEIs / Date Codes: All / All
2.1.3Affected SW-Versions: All
2.1.4Fault Code for LSO reporting: 3ANC
2.2Fault Description
2.2.1Fault Symptoms for customers:
Network Search when using the external antenna
(carkit)
No location update possible on external antenna (carkit)
2.2.2Fault Symptom on GSM-Tester:
Output power problems on the external antenna
No location update possible
2.2.3Component Information
The Antenna Connector is a mechanical switch operated by the RF plug of a carkit or, for testing
purposes, of an RF clip.
Normally the RF signal goes to and comes from the internal antenna. Whenever an RF plug is
plugged into the antenna connector the connection to the internal antenna is openend and the
connection to the external antenna socket is made. See drawing below.
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Communication Devices
2.3Priority:
........ Mandatory
........ Repair
........ Optional
........ Not Yet Defined
2.4Repair Documentation
2.4.1Description of procedure:
2.4.1.1Diagnosis
Check the output power of the handset with the LSO testprogram.
Especially watch the external antenna power!
2.4.1.2Repair by component change
Use hot air blower to remove defective connector
Avoid excessive heat!
Watch surrounding components!
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From Power
Amplifier/ To
Receiver
To / From
Internal
Antenna
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Communication Devices
Resolder new connector afterwards.
2.4.1.3Repair by SW-Booting
Not possible!
2.4.1.4Test
Retest handset after repair as described above.
2.4.2List of needed material
2.4.2.1Components
C25 antenna connector
Part-Number: L36334-Z93-C261
2.4.2.2 Jigs and Tools
Hot Air Blower
Soldering Iron
2.4.2.3Special Tools
None
2.4.2.4Working materials
Desolder Wick / Braid
Solder
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2.4.3Drawings
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Figure 1: C25 Board Antenna Connector Side (Top View)
Figure 2: C25 Antenna Connector Placement (X400) (Top View)
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Communication Devices
3Ringer Connector
3.1Affected Units
3.1.1Type: C25
3.1.2Affected IMEIs / Date Codes: All / All
3.1.3Affected SW-Versions: All
3.1.4Fault Code for LSO reporting: 3RIC
3.2Fault Description
3.2.1Fault Symptoms for customers:
Problems with the handset ringer. No ringer tone
audible.
3.2.2Fault Symptom on GSM-Tester:
Handset fails ringer test.
3.3Priority:
........ Mandatory
........ Repair
........ Optional
........ Not Yet Defined
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3.4Repair Documentation
3.4.1Description of procedure:
The connector X5 is connecting the main board of the C25 with the piezo
ringer through a two pin cable.
3.4.1.1Diagnosis
Visually check the connector. Watch for bent contacts and dry joints.
3.4.1.2Repair by component change
Resolder dry soldering joints.
If the connector is physically damaged use hot air blower or wick to remove
defective connector.
Avoid excessive heat!
Watch surrounding components!
Resolder new connector afterwards.
3.4.1.3Repair by SW-Booting
Not possible!
3.4.1.4Test
Retest handset after repair.
3.4.2List of needed material
3.4.2.1Components
Ringer Connector C25:
Part-Number: L36334-Z97-C43
3.4.2.2Jigs and Tools
Hot Air Blower
Soldering Iron
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3.4.2.3Special Tools
None
3.4.2.4Working materials
Desolder Wick / Braid
Solder
Flux
3.4.3Drawings
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Figure 1: C25 Board Ringer Connector Side
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4Bottom Connector
(Lumberg)
4.1Affected Units
4.1.1Type: C25
4.1.2Affected IMEIs / Date Codes: All / All
4.1.3Affected SW-Versions: All
4.1.4Fault Code for LSO reporting: 3LUC
4.2Fault Description
4.2.1Fault Symptoms for customers:
Charging problems.
Problems with external loudspeaker or microphone
when using a car kit.
Problems with accessories connected at the bottom
connector.
4.2.2Fault Symptom on GSM-Tester:
Testequipment cannot communicate with the handset.
4.3Priority:
........ Mandatory
........ Repair
........ Optional
........ Not Yet Defined
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Figure 2: C25 Ringer Connector (X5) Placement (Top View)
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