User Guide

Flow chart of trouble shooting5-21
5-12 GSM Transmit
Tx On (level : 5)
U602
Pin 8
U602
Pin 5
U607
Pin 4
U608
Pin 1
U610
Pin 1
U610
Resolder
U600
Check
VC1 : L
VC2 : H
Change or Resolder
U602
Resolder
U607, C608
Resolder of Change
C651, R607, R608, R609
Resolder or Change
U610
At 1150~1185MHz,
Pin 10
At CH 1080MHz,
Resolder
U605, U612
U605
Pin 17, 18, 19, 20
Resolder
OneC(U501)
Check U605
Resolder
U605 (Pin35, 38)
Resolder
U501
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
U608 : +VBATT
Pin 2 (APC)
OK?
Resolder or
Change U608
Yes
Check +VBATT
or APC Control
No
Pin 23
U612