Dcs Receiver - Samsung SGH-i300 Service Manual

SGH-i300 Flow Chart of Troubleshooting and Circuit Diagrams

2-13. DCS Receiver

Continuous RX on
RFinput : 698CH AMP :
-50dBm
Normal
Condition catch
the channel?
F903 check
pin6 = -65dBm
F903 check
pin 12,13 = -65dBm
U902 check
pin 18,19 = -65dBm
Yes
U902 check
pin 8 = 13M ?
Vp-p : 860mV
Yes
U902 check
pin 9,32 clean 2.8V
Yes
U902 check
pin 1,2
Vp-p : 250mV
Yes
U902 check
pin 1,2,3,28
Vp-p : 100mV
Yes
Check U701
This Document can not be used without Samsung's authorization
Yes
Yes
Yes
U701 pin B10, C709,
check or resolder
No
TCX701 check
pin3 = 13M ?
Vp-p : 950mV
C726, R705
check or resolder
No
No
No
SAMSUNG Proprietary-Contents may change without notice
No
Check soldered status
of C933,L901
No
ANT902 resolder or
No
F903 resolder or
No
C926, C927, L904
resolder or change
C710
No
Yes
U701 pin A13, C712
Check or resolder
U902 check or resolder
U902 check or resolder
2-19
change
change
No
TCX701 check
pin 4 = clean 3V?
Yes
TCX701 change or
resolder