Samsung SGH D900i Service Manual - Page 58
GSM Transmitter
 |
View all Samsung SGH D900i manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 58 highlights
9-13. GSM Transmitter Flow Chart of Troubleshooting TX ON (5Level) Yes F100 Pin11 ≥ 30dBm No F100 pin17 ≥ 30dBm No PAM100 pin18 ≥ 30dBm No PAM100 pin12 ≥ -4dBm No U106 pin 4,5,6,7 ≥ 0.2Vp_p No Check U200 END Yes Resolder RFS100,C103,L100 Yes Check F100 pin114 = H (2.6V), Pin10 = L Yes Yes Resolder or Change L107 No Check ANT Switch control circuit Change or Resolder F100 Yes Check PAM100pin Yes 4,5,8,14 +Vbatt Resolder or Change PAM100 pin2,3,15,16 OK? No Check VBAT or PAM control signal Yes U106pin 16,17,29 32,36 ≥2.8V No Check U106, pin10≥1.8V C116,C119,C121 Yes Resolder U106 9-21 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization
-
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
 |
 |
SAMSUNG Proprietary-Contents may change without notice
Flow Chart of Troubleshooting
This Document can not be used without Samsung's authorization
9-21
9-13. GSM Transmitter
END
Check U200
Yes
Resolder U106
Check VBAT or PAM
control signal
No
Change or Resolder F100
Yes
U106pin 16,17,29
32,36 ≥2.8V
pin10≥1.8V
F100 Pin11
≥ 30dBm
Resolder RFS100,C103,L100
TX ON (5Level)
Check F100
pin114 = H (2.6V),
Pin10 = L
F100 pin17
≥ 30dBm
PAM100 pin18
≥ 30dBm
PAM100 pin12
≥ -4dBm
Check ANT Switch
control circuit
Resolder or Change L107
U106 pin 4,5,6,7
≥ 0.2Vp_p
Yes
Check PAM100pin
4,5,8,14 +Vbatt
pin2,3,15,16 OK?
Resolder or Change PAM100
Check U106,
C116,C119,C121
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No