Egsm Rx - Samsung SGH-E790 Service Manual

3-2. RF

3-2-1. EGSM RX

NORMAL CONDITION
catch the channel?
CPL400 Check
Pin1 ≥ -65dBm ?
CPL400 Check
Pin10, 9 ≥ -65dBm ?
Pin6, 7 ≥ -65dBm ?
Pin1, 31, 48 : 2.8V ?
Pin35 : 26Mhz?
Vp-p : 950mV?
Pin24, 25, 26, 27
Vp-p : 120mV?
⑧
U100
Yes
Yes
Yes
U401 Check
Yes
U401 Check
Yes
U401 Check
Yes
U401 Check
Yes
CHECK!!
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①
No
CHECK
ANT402, R424
②
No
C413, RFS400
resolder or change
③
No
CPL400
resolder or change
④
No
C422, C423,
resolder or change
⑤
No
U100 pin J3,J4,K3,K4
resolder or change
⑥
No
TCX400
resolder or change
⑦
No
U401
resolder or change
3-17
Flow Chart of Troubleshooting
contact?
L407