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