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5-11 GSM Receiver
5-11
Rx On
RF input : CH center freq. + 67.7 kHz
Amp. : -50 dBm
U208
No
Pin 2
-65 dBm
Yes
U208
No
Pin 9
-65 dBm
Yes
F203
No
Pin 1
-70 dBm
Yes
F201
No
Pin 2
-60 dBm
Yes
U201
No
Pin 1, 2
-60 dBm
Yes
U201
No
Pin 42, 43
(225 MHz)
-50 dBm
Yes
U201
Pin 24, 25
No
(45 MHz)
-55 dBm
Yes
U201
No
Pin 21, 22, 23, 24
40 mV
Yes
Check U201
No
Pin 44, 45
2.5 V
U201 (Pin35, Pin44, 45)
Pin 35
0.5 V
Yes
Resolder
U414
Check IF connector
- > resolder
Resolder &
No
U208 Pin 9
-65 dBm
Yes
Resolder
F203
Resolder
Q200, L209, L207,
C234, C223, C222, C237
Resolder
F201, L205, L203,
L206, L204
Check
C229(CH+225MHz)
No
-20 dBm
C138(540MHz)
-20 dBm
Yes
Resolder
F200, C213, C214,
C215, L201
Resolder
OneC(U414), U201
Resolder
Check
VC1 : L
VC2 : L
VC3 : H
Resolder
U107, U104
Flow chart of trouble shooting
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