Gsm Receiver - Samsung SGH-R200 Service Manual

5-11 GSM Receiver

RF input : CH center freq. + 67.7 kHz
5-20
Rx On
Amp. : -50 dBm
U401
No
Pin 8
-65 dBm
Yes
U401
Pin 10
-65 dBm
Yes
F301
No
Pin 1
-70 dBm
Yes
F302
No
Pin 1
-60 dBm
Yes
U301
No
Pin 53, 54
-60 dBm
Yes
U301
Pin 49, 50
(225 MHz)
-50 dBm
Yes
U301
No
Pin 43, 44
(45 MHz)
-55 dBm
Yes
U301
No
Pin 24, 25, 26, 27
40 mV
Yes
Check U301
No
Pin 32, 33 2.5 V
Pin 35 0.5 V
Yes
Resolder
U110
Resolder
J401
Resolder &
No
U401 Pin 10
-65 dBm
Yes
Resolder
F301
Resolder
C303, L302, C302, L308, C315
Resolder
F302, C357, L309
Check
C348(CH+225MHz)
No
-20 dBm
C343(1080MHz)
-20 dBm
Resolder
F303,C321,C324,C325
C333,C340,C336,L313, R305
Resolder
OneC(U110), U301
Resolder
U301 (Pin35, Pin 32, 33)
Flow Chart of Troubleshooting and Circuit Diagrams
Check
No
VC1 : L
VC2 : L
No
Resolder
U304
Yes