The service manual when downloaded and printed out was clear and easy to read. I would have liked to have been able to enlarge some details, but this was not possible as the file permissions did not allow this. The service was very good. The time taken from placing my order to downloading the document was only a few minutes.
Very good scanned copies. Quick response and reasonable price. Thanks for service!
Text excerpt from page 15 (click to view)
Information and Communication Products Communication Devices 5.4Repair Documentation
5.4.1Description of procedure:
The 18ÂµH 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.
188.8.131.52Repair by component change
Use hot air to remove defective coil. Avoid excessive heat! Watch surrounding components!! Resolder new coil afterwards
184.108.40.206Repair by SW-Booting
Retest handset after repair by checking the audio quality with the echo loop of the testprogram.