Ericsson R320s Working Instruction page 30

4.5 Handsfree speaker out of order
The fault arises when the audio path is interrupted somewhere between the output of N800
and the handsfree microphone (connected through the system connector). The audio path is
shown in fig. 4.2.
Open the phone and check for liquid damage, especially around the system connector.
Make sure that the system connector is not damaged or incorrectly soldered.
Measure the resistances of R804 (100 kohms), R640 (82 ohms) and C813 (>1 Mohm).
Replace if incorrect.
Measure the resistance at C813, from the side close to V807, to pin 10 if J602 (200 kohms).
If the resistance is incorrect, replace R640.
If that does not help there is a foil damage, send the unit on according to the local company
directives
If the fault remains, send the unit on according to the local company directives.
4.6 The handsfree microphone and speaker out of order
Replace J602.
If the fault remains, send the unit on according to the local company directives.
4/00021-2/FEA 209 544/21 B
Fig. 4.2
Trouble Shooting Guide, Standard
14(26)