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Flow Chart of Troubleshooting
11-28
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11-2-5. DCS/PCS TX
U405
check or resolder
U101
check or resolder
Yes
Yes
No
U405
pin25,26,27,28
Vp-p=1V ?
TCX400
check or resolder
No
U405
pin35 : 26MHz ?
Vp-p : 950mV ?
Yes
U101
pin
A13
,
B10
,
C112
,
C114
check or resolder
No
U405
pin16,41,31,29
: 2.9V ?
No
U101
check
PAM406
check & change
Yes
PAM406
pin 2 : 0V?
pin 3 : 3V?
Yes
No
PAM406 pin1
about 5dBm ?
Yes
U405 pin21
check
No
PAM406
pin 6 : 2.9V ?
Yes
BATTERY
check & change
No
PAM406
pin16, 17: 3.7V?
No
DUF400
check & change
Yes
PAM406 pin19:
about 30dBm?
C421
,
RFS400
R405
,
ANT401
check & change
Yes
Yes
U101
check & change
No
DUF400
pin 3 : 2.6V ?
No
U404 pin 13 :
about 30dBm?
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