Table of Contents
Advertisement
5-11 GSM Receiver
RF input : CH center freq. + 67.7 kHz
5-20
Rx On
Amp. : -50 dBm
U203
No
Pin 8
≥ -65 dBm
Yes
U203
Pin 10
≥ -65 dBm
Yes
F203
No
Pin 1
≥ -70 dBm
Yes
F204
No
Pin 1
≥ -60 dBm
Yes
U454
No
Pin 53, 54
≥ -60 dBm
Yes
U454
Pin 49, 50
(225 MHz)
≥ -50 dBm
Yes
U454
No
Pin 43, 44
(45 MHz)
≥ -55 dBm
Yes
U454
No
Pin 24, 25, 26, 27
≥ 40 mV
Yes
Check U454
No
Pin 32, 33 ≥ 2.5 V
Pin 35 ≤ 0.5 V
Yes
Resolder
U618
Resolder
CN1
Resolder &
No
U203 Pin 10
≥ -65 dBm
Yes
Resolder
F203
Resolder
C234, L209, C596,
L218, C582, C758, R220
Resolder
F204, C727, L204, C600
Check
C481(CH+225MHz)
No
≥-20 dBm
C137(1080MHz)
≥ -20 dBm
Resolder
F200, C698, C699, C494,
C215, C213, L201, R223,
L212, L213, C242
Resolder
OneC(U618), U454
Resolder
U454 (Pin 32,33,35)
Flow Chart of Troubleshooting and Circuit Diagrams
Check
No
VC1 : L
VC2 : L
No
Resolder
U478
Yes
Advertisement
Table of Contents
