SAMSUNG Proprietary-Contents may change without notice
5-27
SGH-A408 Flow Chart of Troubleshooting and Circuit Diagram
5-14. DCS Transmit
Tx On (level : 0)
Battery voltage : 3.8 V
Using 20 dB Attenuator
N
Y
Y
U505
Pin 9
≥
25 dBm
Resolder
CN500
LAM1
Pin 1
≥
25 dBm
Resolder or Change
LAM1
Y
Y
Y
Change
U510
END
Y
N
Y
Change OSC300
N
N
N
U510
pin 2
≥
0 dBm
Y
Resolder or Change
U505
Y
N
U505
Pin 11
≥
25 dBm
N
N
Resolder or Change
U503, Q501
Y
Resolder or Change
U512
Y
Change U300
N
Change
U508
Check voltage
Pin 2 : L
Pin 4 : H
Pin 8 : L
Pin 10 : H
U513
Pin 9 : L
Pin 7 : H
U513 pin 3
1~2.3V ?
Check
OSC300 pin1
≥
-10 dBm
Check
U510 pin14
1V ~ 2V ?
Change U513
1
2
3
4
Содержание SGH-A408
Страница 20: ...SAMSUNG Proprietary Contents may change without notice 3 1 3 SGH A408 Block Diagrams 3 1 Main Block Diagram ...
Страница 21: ...SAMSUNG Proprietary Contents may change without notice 3 2 SGH A408 Block Diagrams 3 2 Main RF Block Diagram ...
Страница 56: ... Samsung Electronics Co Ltd November 2001 Pinted in Korea Code No GH68 02384A BASIC ELECTRONICS ...