Siemens C25 Service Manual

Information and Communication Products
Communication Devices
V1.2 Page 26 of 34 ICP CD ST
D. Schnoor
8/99
8.4 Repair Documentation
8.4.1 Description of procedure:
8.4.1.1 Diagnosis
The capacitors are used to buffer the supply voltage of the display
controller. Especially C308 has occasionally been found defective.
Check the status of the capacitors by measuring ist capacitance with a
appropriate measurement device. The capacitance must be in the
220nF range. Defective caps often have a lower capacitance around
100nF.
8.4.1.2 Repair by component change
Use hot air blower or soldering iron to remove defective capacitor.
Avoid excessive heat!
Watch surrounding components!
Resolder new capacitor afterwards.
8.4.1.3 Repair by SW-Booting
Not possible!
8.4.1.4 Test
Retest handset after repair.
8.4.2 List of needed material
8.4.2.1 Components
Display Capacitor C25(88)
Part-Number: L36375-F3224-K
8.4.2.2 Jigs and Tools
Hot Air Blower
Soldering Iron

Siemens C25 Specifications

General

Announced	1999
Display Type	Monochrome graphic
Talk Time	Up to 4 h
SIM	Mini-SIM
Call Records	10 dialed, 10 received, 10 missed calls
Loudspeaker	No
3.5mm Jack	No
Messaging	SMS
Clock	Yes
Alarm	Yes
Games	Yes
Languages	Multiple
Network	GSM
Weight	135 g
Battery Type	Removable NiMH battery
Alert Types	Monophonic ringtones