5-22
Flow Chart of Troubleshooting and Circuit Diagrams
5-13 DCS Receiver
Rx On
RF input : CH center freq. + 67.7 kHz
Amp. : -50 dBm
U203
Pin 8
≥
-50 dBm
U203
Pin 1
≥
-53 dBm
F204
Pin 1
≥
-53 dBm
U623
Pin 17, 18
≥
-58 dBm
U623
Pin 1, 2
≥
50 mV
U685
Pin 2, 3, 4, 5
> 100 mV
Resolder
CN1
Check
VC1 : L
VC2 : L
Check
Ant. s/w
control
circuit
Resolder
C821, L612
Resolder
F204, C785, C786, L608
Resolder
U467
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Check
U623
Pin 12, 13
(Freq-100KHz)
≥
-6 dBm
OK?
No
Resolder
U203
Check
U623
Pin 14, 23, 26, 31, 32
> 2.7 V
OK?
Resolder
U685
No
Yes
Yes
No
Check
U685
Pin 14, 16, 17, 18
OK?
Check
U685
Pin 7, 20
OK?
No
Check
Radio PSU,
RF13MHz part
Yes
No
Check & Resolder
I/O signal, RF13MHz, RF PSU Part
Resolder
U623
Содержание SGH-R210E
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