Audio - Ericsson GF 768 Troubleshooting Manual

4/00021-2/FEA 209 544/6 C

9. Audio.

9.1 Type of fault.
Make a call from the phone that is to be tested (later called the phone) to a phone that is working correctly
(later called the reference phone).
Check the function of the microphone and the earphone.
Connect a handsfree unit to the system connector of the phone.
Check the function of the phone's external connections by listening to the external speaker/earphone when talking
in the reference phone and by listening to the earphone of the reference phone when talking in the external mic of
the phone.
• If there is low or no sound in the earphone of the phone, go to 9.2.
• If both the earphone and the handsfree speaker don't work, send the phone to the next level.
• If the sensitivity of the microphone is low (low or no sound in the reference phone), go to 9.3.
• If both the microphone in the phone and the microphone of the handsfree don't work, send the phone to the
next level.
• If both the microphone and the earphone don't work, go to 9.4.
• If the microphone, the earphone and the handsfree don't work, send the phone to the next level.
• If the microphone of the handsfree doesn't work, go to 9.5.
• If the speaker of the handsfree doesn't work, go to 9.6.
• If both the microphone and the speaker of the handsfree don't work, go to 9.7.
• If the phone sounds strange (the sound is distorted, scrambled, full of static or "chopped"), send the phone to
the next level.
9.2 Earphone out of order.
Open the phone and check for water damages.
Most of the earphone faults are mechanical. Therefore you should start with replacing the front (with the ear-
phone) to one you know works and try again.
• If the fault remains, make sure the earphone connector (J810, fig. 9.1) is intact and correctly soldered.
• Check the solderings of N800 (fig. 9.2).
Fig. 9.1
Troubleshooting guide
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