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5-14 DCS Transmitter
Tx On (level : 0)
U605
Pin 8
25 dBm
U605
Pin 3
25 dBm
U600
Pin 11
U600
Pin 1
U502
Pin 24
U502
Pin 5, 6, 7, 8
40
Resolder
U600
Flow Chart of Troubleshooting and Circuit Diagrams
Yes
No
Yes
No
Yes
25 dBm
No
Yes
0 dBm
No
Yes
0 dBm
No
Yes
mV
Yes
Pin 14, 23, 26, 31, 32
Resolder
U604
Check
VC1 : H
VC2 : L
No
Resolder
C614, C605
Check
U600 : +VBATT,
Pin 2, 5, 6
OK?
Resolder
R504, R502,
R503, C507
Check
U502
No
Pin 9, 10, 12, 13
-6 dBm
OK?
Yes
Check
U502
No
> 2.7 V
OK?
Yes
Yes
Change or Resolder
U605
Check
Ant. S/W Control Circuit
Yes
Resolder or
Change U600
No
Check +VBATT
or PAM Control signal
Check & Resolder
I/O signal, RF13MHz, RF PSU Part
Resolder
U623
5-22
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