FLY FS501, Руководство по обслуживанию, Страница: 18 / 29

FLY SERVICE SUPPORT
3.2.2 Audio faults
The audio part has main four parts including the speaker, receiver, mic and headphone.
First undesirable phenomena distinguish what part of the problem, and then analyzed according
to the following respective module.
（ 1 ） Speaker loop
The FS501 phone’ s speaker circuit is as follow
Speaker Loop
Speaker Common faults and reasons
：
1,SPK Ringtones reasons:
1) light board, SPK itself is bad, or the connection FPC problem, the whole observation board board PFC Cartridge is
skew, not in place
2) relevant component there is dry welding
3 ) software problems
2,SPK ringtones or murmur:
1) software volume settings
2) SPK ontology reasons
3,Switch machine ringtones, but engineering tests SPK OK:
1) scene mode is set to switch machine ringer off