Siemens C25 Service Manual

Information and Communication Products
Communication Devices
V1.2 Page 30 of 34 ICP CD ST
D. Schnoor
8/99
9.4 Repair Documentation
9.4.1 Description of procedure:
9.4.1.1 Diagnosis
The coil is used to generate the voltage to operate the piezo ringer. If it
is defective, the ringer cannot work anymore.
Check the status of the coil by measuring its resistance with a
multimeter. The resistance must be very low. Also broken coils have to
be replaced.
9.4.1.2 Repair by component change
Use hot air blower or soldering iron to remove defective coil.
Avoid excessive heat!
Watch surrounding components!
Resolder new coil afterwards.
9.4.1.3 Repair by SW-Booting
Not possible!
9.4.1.4 Test
Retest handset after repair.
9.4.2 List of needed material
9.4.2.1 Components
Ringer Coil C25(88)
Part-Number: L36151-F5105-K3
9.4.2.2 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