Ericsson A1018S - Page 17

A1018s/A1018sc Standard Electrical Repair
4/00021-2/FEA 209 544/16.B 17 (42)
4.5 The handsfree microphone is out of order.
Open the phone and check for liquid damages, especially around the pads of the
system connector, J602:1,2,4 (fig. 4.3).
Fig. 4.3
Measure the resistance between J602:2 and ground, it should be larger then 30
kOhm. If the resistance is too low (ATMS has a short circuit), try to replace C651
(class A, fig 4.1).
Check the soldering at N800 (Note! Class C, fig. 4.2).
Check the resistance at:
R825 (3,3 kOhm)
R814 (470 Ohm)
C814 (>20 kOhm)
C810 (>50 kOhm)
C812 (>1 MOhm)
R802 (3.9 kOhm)
R805 (15 kOhm)
R803 (1 kOhm)
If any component is faulty, replace it (all class A, fig. 4.4).