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5-14 DCS Transmit
Flow chart of trouble shooting
Tx On (level : 0)
U602
Yes
Pin 2
No
U602
Yes
Pin 13
No
U609
Yes
Pin 4
No
U608
Pin 8
No
U610
Yes
Pin 5
No
U610
No
Pin 9 = 0.5~2.5 V
No
At 540MHz,
No
U612
At CH - 135MHz,
Yes
U605
No
Pin 17, 18, 19, 20
Yes
No
Check U605
Pin 35, Pin 38
Yes
Resolder
U501
Resolder
U600
Check
VC1 : L
VC2 : H
VC3 : L
No
Resolder
U609, C606
Check
Yes
U608 : +VBATT
Pin 2 (APC)
OK?
Resolder or Change
C647, R614
Resolder
U610
Resolder
U605, U612
Resolder
OneC(U501)
Resolder
U605 (Pin35, 38)
Yes
Change or Resolder
U602
Check
Ant. S/W, Control Circuit
Yes
Resolder or Change
U608
No
Check +VBATT
or APC Control
5-21
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