Table of Contents
Advertisement
5-13 GSM Transmit
5-20
Tx On (level : 5)
U706
Yes
Pin 8
°√ 30 dBm
No
U706
Yes
Pin 5
°√ 30 dBm
No
Yes
U707
Pin 4
°√ 30 dBm
No
U707
Yes
Pin 1
°√ 0 dBm
No
U602
Yes
Pin 1
°√ 7 dBm
No
U602
No
Pin 3 °¬ 2.5 V
Pin 11 °√ 2.8 V
Pin 9 = 0.5~2.5 V
Yes
U601
No
pin 30, 47
°√ -10 dBm
Yes
U601
No
Pin 17, 18, 19, 20
°√ 40 mV
Yes
Check U601
No
Pin 38 °√ 2.5 V
Pin 35 °¬ 0.5 V
Yes
Resolder
U400
Resolder
U708
Check
VC1 : H
VC2 : L
No
Resolder
U700, L707
Check
U707 : +VBATT
Pin 2 (APC)
OK?
Resolder or Change
C640, R702, R700, R701, C705
Resolder
U400, U502, U503
U504, U602
Resolder
U501
Resolder
OneC(U400)
Resolder
U601 (Pin35, Pin38)
Flow chart of Troubleshooting and Circuit Diagram
Yes
Change or Resolder
U706
Check
Ant. S/W, Control Circuit
Yes
Resolder or
Change U707
No
Check +VBATT
or APC Control
Advertisement
Table of Contents
