Samsung SGH D900i Service Manual - Page 61

PCS Receiver

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Flow Chart of Troubleshooting 9-16. PCS Receiver RX ON RF input : CH center freq : +67.7kHz Cell Power : -60dBm Yes F100 Pin11 No ≥ -65dBm Resolder RFS100,C103,L100 Yes F100 7,8 ≥ -68dBm No Check F100 No Check ANT Switch pin10,pin14 = L control circuit Yes U106 pin 20 ≥ -70dBm pin 21 ≥ -70dBm Yes No Resolder C112, C126, L108 Resolder F100 Yes No U106 pin 4,5,6,7 ≥ 0.2Vp_p Yes Check U200 U106pin16,17,29, 32,36 ≥2.8V pin 10≥1.8V Yes No Check & Resolder C116,C119,C121 And PMU Part Resolder U106 END 9-24 SAMSUNG Proprietary-Contents may change without notice This Document can not be used without Samsung's authorization

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SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
Flow Chart of Troubleshooting
9-24
9-16. PCS Receiver
RX ON
RF input : CH center freq : +67.7kHz
Cell Power : -60dBm
Yes
F100 Pin11
≥ -65dBm
No
Resolder RFS100,C103,L100
Yes
F100 7,8
≥ -68dBm
Check F100
pin10,pin14 = L
No
No
Check ANT Switch
control circuit
Yes
Yes
Resolder F100
U106
pin 20 ≥ -70dBm
pin 21 ≥ -70dBm
No
Resolder C112, C126, L108
Yes
U106pin16,17,29,
32,36 ≥2.8V
pin 10≥1.8V
U106 pin 4,5,6,7
≥ 0.2Vp_p
No
No
Check & Resolder
C116,C119,C121
And PMU Part
Yes
Yes
Resolder U106
Check U200
END