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5-14 DCS Transmitter
Tx On (level : 0)
U203
Pin 8
≥ 25 dBm
U203
Pin 3
≥ 25 dBm
U476
Pin 11
≥ 25 dBm
U476
Pin 1
≥ 0 dBm
U623
Pin 24
≥ 0 dBm
U623
Pin 5, 6, 7, 8
40 ≥ mV
Resolder
Flow Chart of Troubleshooting and Circuit Diagrams
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
Yes
Pin 14, 23, 26, 31, 32
U467
Resolder
CN1
Check
VC1 : H
VC2 : L
No
Resolder
L614, C263
Check
U476 : +VBATT,
Pin 2, 5, 6
OK?
Resolder
U696, C802
Check
U623
No
Pin 9, 10, 12, 13
≥ -6 dBm
OK?
Yes
Check
U623
No
> 2.7 V
OK?
Yes
Yes
Change or Resolder
U203
Check
Ant. S/W Control Circuit
Yes
Resolder or
Change U476
No
Check +VBATT
or PAM Control signal
Check & Resolder
I/O signal, RF13MHz, RF PSU Part
Resolder
U623
5-23
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