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Flow Chart of Troubleshooting
5-20
5-11 GSM Receiver
Rx On
RF input : CH center freq. + 67.7 kHz
Amp. : -50 dBm
U304
Pin 2
≥
-65 dBm
U304
Pin 9
≥
-65 dBm
F304
Pin 5
≥
-70 dBm
F303
Pin 2
≥
-60 dBm
U305
Pin 53, 54
≥
-60 dBm
U305
Pin 49, 50
(225 MHz)
≥
-50 dBm
U305
Pin 43, 44
(45 MHz)
≥
-55 dBm
Resolder
J301
Resolder &
U304 Pin 9
≥
-65 dBm
Check
VC1 : L
VC2 : L
VC3 : H
Resolder
F304
Resolder
C341, L317, L316, C336, C333
Resolder
F303, L323, L324
Check
C301(CH+225MHz)
≥
-20 dBm
C315(1080MHz)
≥
-20 dBm
Resolder
U302
Resolder
F301,C309,C310,C313
C314,C318,C312,L308, R309
U305
Pin 24, 25, 26, 27
≥
40 mV
Resolder
OneC(U108), U305
Check U305
Pin 32, 33
≥
2.5 V
Pin 35
≤
0.5 V
Resolder
U305 (Pin35, Pin 32, 33)
Resolder
U108
No
No
No
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Summary of Contents for SGH-N300
Page 2: ...Samsung Electronics Co Ltd Printed in Korea 06 2001 Rev 1 0 GH68 02097A ELECTRONICS ...
Page 11: ...Exploded Views and Parts List 1 8 1 10 Desk Top Charger DESK TOP CHARGER GH44 00206A ...
Page 12: ...2 1 PCB Diagrams Schematic Diagrams 2 PCB Diagrams 2 1 Main Top ...
Page 13: ...2 2 PCB Diagrams Schematic Diagrams 2 2 Main Bottom ...
Page 41: ...Flow Chart of Troubleshooting 5 12 J101 SPK101 U110 PWO1P PWO1N SPK SPK 6 2 3 SPK SPK ...