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SIEMENS C25
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SIEMENS C25 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

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Text excerpt from page 15 (click to view)
Information and Communication Products Communication Devices 5.4Repair Documentation

5.4.1Description of procedure:

5.4.1.1Diagnosis

The 18µH coil is used in the step up converter which is generating a 5.4 V supply voltage for the power amplifier out of the 2.8V battery voltage. If the coil is mechanically damaged (broken) it produces heavy interference with the acoustical elements of the C25 resulting in a loud humming noise in the earpiece. A broken coil can easily be diagnosed by trying to move it with two fingers. If it moves, the core is broken and the coil has to be replaced.

5.4.1.2Repair by component change

Use hot air to remove defective coil. Avoid excessive heat! Watch surrounding components!! Resolder new coil afterwards
5.4.1.3Repair by SW-Booting

Not possible!
5.4.1.4Test

Retest handset after repair by checking the audio quality with the echo loop of the testprogram.

V1.2

Page 15 of 34

ICP CD ST D. Schnoor 8/99

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