LG KG280 Service Manual - Page 75
C228, C230
 |
View all LG KG280 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 75 highlights
4. TROUBLE SHOOTING CHECKING FLOW SETTING : After initialize Agilent 8960, Test GSM850,EGSM,DCS,PCS mode START Voltage VMIC of U101 NO Replace U101 = DC 2.5V? YES Check the signal Level at each side NO of MIC200. Is it a few tens mV AC? YES Replace microphone Check the soldering of NO R221, R222, C228, C230 YES Microphone will work properly. Resolder component LGE Internal Use Only - 76 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes
-
1 -
2
-
3
-
4
-
5
-
6
-
7
-
8
-
9
-
10
-
11
-
12
-
13
-
14
-
15
-
16
-
17
-
18
-
19
-
20
-
21
-
22
-
23
-
24
-
25
-
26
-
27
-
28
-
29
-
30
-
31
-
32
-
33
-
34
-
35
-
36
-
37
-
38
-
39
-
40
-
41
-
42
-
43
-
44
-
45
-
46
-
47
-
48
-
49
-
50
-
51
-
52
-
53
-
54
-
55
-
56
-
57
-
58
-
59
-
60
-
61
-
62
-
63
-
64
-
65
-
66
-
67
-
68
-
69
-
70 -
71 -
72 -
73 -
74 -
75 -
76 -
77 -
78 -
79 -
80 -
81
-
82
-
83
-
84
-
85
-
86
-
87
-
88
-
89
-
90
-
91
-
92
-
93
-
94
-
95
-
96
-
97
-
98
-
99
-
100
-
101
-
102
-
103
-
104
-
105
-
106
-
107
-
108
-
109
-
110
-
111
-
112
-
113
-
114
-
115
-
116
-
117
-
118
-
119
-
120
-
121
-
122
-
123
-
124
-
125
-
126
-
127
-
128
-
129
-
130
-
131
-
132
-
133
-
134
-
135
-
136
-
137
-
138
 |
 |
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
- 76 -
START
Replace U101
NO
YES
Microphone will work
properly.
SETTING : After initialize Agilent 8960, Test GSM850,EGSM,DCS,PCS mode
YES
Check the signal
Level at each side
of MIC200.
Is it a few tens
mV AC?
Check the soldering of
R221, R222,
C228, C230
Voltage VMIC
of U101
= DC 2.5V?
NO
Replace microphone
YES
NO
Resolder component
CHECKING FLOW