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5-14 DCS Transmitter
Tx On (level : 0)
SGH-N500 Flow Chart of Troubleshooting and Circuit Diagrams
U203
Yes
Pin 8
≥ 25 dBm
No
Yes
U203
Pin 3
≥ 25 dBm
No
U318
Yes
Pin 7
≥ 25 dBm
No
Yes
U476
Pin 8
≥ -10 dBm
No
U200
Yes
Pin 10
C217, R212, R211, R754, R204
≥ -10 dBm
No
U200
No
Pin 7 ≥ 2.5 V
Pin 5 ≥ 2.5 V
Pin 3 = 0.5~2.5 V
Yes
Resolder U200 &
Check Pin 7, 5 path
U454
No
Pin 17, 18, 19, 20
≥ 40 mV
Yes
Check U454
No
U454 (Pin35, Pin38)
Pin 38, Pin 35
≥ 2.5 V
Yes
Resolder
U618
Resolder
CN1
Check
VC1 : H
VC2 : L
No
Resolder
U318, C263
Check
U476 : +VBATT,
Pin 2 (APC)
OK?
No
Resolder
U454
Check
No
U200 Pin 3.
pin 30, 47
OK?
≥ -10 dBm
Yes
Resolder
U454, U200
Resolder
OneC(U618)
Resolder
Check U618
Yes
Change or Resolder
U203
Check
Ant. S/W Control Circuit
Yes
Resolder or Change
U476
Check +VBATT
or APC Control
No
Resolder
U478
Yes
5-23
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