Ericsson I 888 Trouble-Shooting Instruction page 17

If the fault remains, check the solderings on N800:13-18(Fig 4.2). If they are good,
measure the resistance of C850 (>100 kOhm, class A, Fig 4.2), C851 (>1 kOhm,
class A, Fig 4.2), C829 and C830 (>100 kOhm, Both are class A, Fig 4.2) and over
C818 and C819 (>100 kOhm, both are class A, Fig 4.2). Measure the resistance of
C815 (Fig 4.1), if the resistance are below 50 kOhm than replace C815 and C816
(both are class A, Fig 4.1). Measure the resistance of R818 (Fig 4.2), the resistance
should be larger than 10 kOhm, if it is lower replace R818 and C820 (both are class
A, Fig 4.2). Measure the resistance of R810 (1 kOhm, class A, Fig 4.2), R811
(1kOhm, class A, Fig 4.2), R812 (1,5 kOhm, class A, Fig 4.2), R814 (470 ohm,
class A, Fig 4.2) and R820 (1,5 kOhm, class A, Fig 4.2). If the resistance of R820 is
too low after R820 has been replaced, replace V805 (class A, Fig 4.1). Measure the
resistance of C814 (>100 kOhm, class A, Fig 4.2). If the fault remains, send the
phone to next repair level.
4.4 Speakerfault together with handsfree.
Check the connection surface at the system connector. If they are fine, open the
phone and check for liquid damages, especially at the system connector pads. Check
the solderings on N800:22 (Fig 4.2). Measure the resistance of R804 (Fig 4.4), if the
resistance is lower than 50 kOhm replace F601 (class A, Fig 4.1). If that doesn´t
work then replace R804 (class A, Fig 4.4). Measure the resistance of R806 (100
Ohm, class A, Fig 4.4) and C813 (>100 kOhm, class A, Fig 4.4). If the fault
remains, send the phone to next repair level.
R802
C810
R825
C813
R804 R806
4.5 Microphone fault together with handsfree.
Check the connection surface at the system connector. If they are fine, open the
phone and check for liquid damages, especially at the system connector pads. Check
the solderings on N800:19 (Fig 4.2). Measure the resistance of R825 (3.3 kOhm,
class A, Fig 4.4), R830 (470 Ohm, class A, Fig 4.4), R802 (3.9 kOhm, class A, Fig
4-00021-2/FEA 209 544/5.C
I888, Standard Electrical Repairs
C817
C812
D600
R805
R830
C835
R636
Fig 4.4
32
1
33 128
97
64
96
65
R601
17
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