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Flow Chart of Troubleshooting
11-21
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11-2. RF
11-2-1. GSM850/EGSM RX
NORMAL CONDITION
catch the channel?
No
CHECK
ANT401
,
R405
contact?
Yes
DUF400 Check
Pin1
≥
-65dBm ?
Yes
No
C421
,
RFS400
resolder or change
DUF400 Check
Pin10, 11
≥
-65dBm ?
Yes
No
DUF400
resolder or change
U405 Check
Pin6, 7
≥
-65dBm ?
Yes
No
C431
,
C436
,
L406
resolder or change
U405 Check
Pin1, 31, 48 : 2.9V ?
Yes
No
U101
pin
A13
,
B10
,
C112
,
C114
resolder or change
U405 Check
Pin35 : 26Mhz?
Vp-p : 950mV?
Yes
No
TCX400
resolder or change
U405 Check
Pin25, 26, 27, 28
Vp-p : 120mV?
Yes
No
U405
resolder or change
U101
CHECK!!
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