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4 Audio Problems
•
Make a general visual inspection for corrosion or oxidation from liquid damage. No
further action should be taken for a liquid damaged phone. Handle the unit on according
to the local company directives.
•
Make a call to another phone and check if it is the microphone or the earphone that causes
the audio problem.
Another way of testing the earphone and microphone is to use the service tests in the
software, see chapter 12. Service functions in the software.
Choose: 3. Service tests / 6. Earphone. While a key is pressed a tone should be heard from
the earphone.
Choose: 3. Service tests / 7. Microphone. Your voice should be heard in the earphone
without delay when you are speaking in the microphone.
If the customer complains about handsfree problem, connect a handsfree and test
handsfree function.
•
If the earphone causes problem, check the earphone connection pads on the board for
dirt/mechanical damage (Fig. 1). If necessary, clean the pads.
Check the earphone for dirt/mechanical damage (Fig. 2). If necessary clean the earphone
connector or replace the earphone.
When the earphone is replaced the earphone volume should be checked. If it is necessary,
change the earphone parameters with the service tests in the software, see chapter 12.
Service functions in the software.
Choose: 2. Service settings / 3.Select speaker/Reset 1.
•
If the microphone causes problem, check the microphone connection pads on the board
for dirt/mechanical damage (Fig. 3). If necessary, clean the pads.
Check the microphone connector for dirt/mechanical damage (Fig. 4). If necessary
replace the microphone.
When the microphone is replaced the microphone volume should be checked. If it is
necessary, change the microphone parameters with the service tests in the software, see
chapter 12. Service functions in the software.
Choose: 2. Service settings / 2.Select microphone /Reset 1.
•
If the phone has handsfree problem, check the system connector for dirt/mechanical
damage (Fig. 5). If necessary, clean or replace the system connector.
•
If the fault still remains handle the unit on according to the local company directives.
4/00021-2/FEA 209 544/62 C
©
Ericsson Mobile Communications AB
Repair Instruction, Electrical
5(16)
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