Gsm Transmit - Samsung SGH-N600 Service Manual

5-12 GSM Transmit

5-21
Tx On (level : 5)
U312
Yes
Pin 8
No
U312
Yes
Pin 5
No
U313
Yes
Pin 1
No
U311
Pin 1
No
U308
Yes
C356, R330, R329, R331
No
U308
Yes
Pin 3, 5, 7 = 0.5-2.5V
Yes
U306
At 1150~1185MHz,
No
Pin 10
At CH 1080MHz,
Pin 23
Yes
U307
No
Pin 17, 18, 19, 20
Yes
Check U307
No
Yes
Resolder
U117
Resolder
J301
Check
VC1 : L
VC2 : H
No
Resolder
U313, C376
Check
Yes
U311 : +VBATT
Pin 2 (APC)
OK?
No
Resolder of Change
Resolder or Change
U308
Resolder
U307, U306
Resolder
OneC(U117)
Resolder
U307 (Pin35, 38)
SGH-N600 Flow chart of trouble shooting
Yes
Change or Resolder
U312
Check
Ant. S/W, Control Circuit
Yes
Resolder or
Change U608
Check +VBATT
or APC Control