User Guide

Flow Chart of Troubleshooting and Circuit Diagrams 5-23
5-14 DCS Transmitter
Tx On (level : 0)
U203
Pin 8
≥ 25 dBm
U203
Pin 3
≥ 25 dBm
U318
Pin 7
≥ 25 dBm
U476
Pin 8
≥ -10 dBm
U200
Pin 10
≥ -10 dBm
U200
Pin 7 ≥ 2.5 V
Pin 5 ≥ 2.5 V
Pin 3 = 0.5~2.5 V
Resolder
CN1
Check
VC1 : H
VC2 : L
Change or Resolder
U203
Resolder
U318, C263
Resolder
C217, R218, R217, R204
U454
Pin 17, 18, 19, 20
≥ 40 mV
Resolder
OneC(U618)
Check U454
Pin 38, Pin 35
≥ 2.5 V
Resolder
U454 (Pin35, Pin38)
Check U618
Resolder
U618
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Check
Ant. S/W Control Circuit
Check
U476 : +VBATT,
Pin 2 (APC)
OK?
Resolder or Change
U476
Yes
Check +VBATT
or APC Control
No
Yes
Resolder
U478
U454
pin 30, 47
≥ -10 dBm
No No
Check
U200 Pin 3.
OK?
No
Yes Yes
Resolder
U454, U200
Resolder U200 &
Check Pin 7, 5 path