Ericsson A2618s Troubleshooting Manual page 11

4.3 Hands-free microphone out of order
The fault appears when the audio path is interrupted somewhere between the hands-free
microphone (connected through the system connector) and the input of N500.
The audio path is shown in Fig. 4.1.
Open the unit and check for liquid damage, especially around the system connector.
No action is to be taken for a liquid damaged unit, send the unit on according to the local
company directives.
Make sure the system connector is not damaged or incorrectly soldered.
Make sure all the components in Fig. 4.1. (N501, C500, C505, C506, R501 and C504) are
correctly mounted on the board.
Measure the resistance of C500 (>100 kohms), C505 (>10 kohms), C506 (>1 Mohm),
R501 (0 ohm), R504 (1 kohm).
If any component is incorrect, replace it.
If the fault still remains, send the unit on according to the local company directives.
4.4 Hands-free speaker out of order
The fault arises when the audio path is interrupted somewhere between the output of N500
and the hands free microphone (connected through the system connector).
The audio path is shown in Fig. 4.2.
4/00021-2/FEA 209 544/25 A
Fig. 4.1
Fig. 4.2
Trouble Shooting Guide, Standard
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