5-12
Flow chart of trouble shooting
5-12 GSM Transmit
Tx On (level : 5)
U208
Pin 2
≥
30 dBm
U208
Pin 7
≥
30 dBm
U206
Pin 4
≥
30 dBm
U106
Pin 9
≥
-10 dBm
U200
Pin 6
≥
-10 dBm
U200
Pin 7
≥
0.5V
Pin 5
≥
2.8 V
Pin 3 = 0.5~2.5V
Resolder
J401 pin 20
Check
VC1 : H
VC2 : L
VC3 : L
Change or Resolder
U208
Resolder
U206, C264
Resolder of Change
C217, R211, R212,
R210, C121
Resolder or Change
U200, R201
At 540MHz,
U104
≥
-10 dBm
At CH - 270MHz,
U107
≥
-10 dBm
Resolder
U201, U104, U107
U201
Pin 13, 14, 15, 16
≥
40 mV
Resolder
OneC(U414)
Check U201
Pin 46
≥
2.5 V
Pin 35
≤
0.5 V
Resolder
U201 (Pin35, Pin46)
Resolder
U414
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Check
Ant. S/W, Control Circuit
Check
U106 : +VBATT
Pin 10 (APC)
OK?
Resolder or
Change U106
Yes
Check +VBATT
or APC Control
No
Summary of Contents for SGH-N100
Page 11: ...Exploded Views and Parts List 1 9 1 11 Desk Top Charger DESK TOP CHARGER GH44 00163A ...
Page 12: ...PCB Diagrams 2 PCB Diagrams 2 1 Main Top ...
Page 13: ...2 1 ...
Page 14: ...PCB Diagrams 2 1 Main Bottom ...
Page 15: ...2 2 ...