Dcs Transmitter - Samsung SGH-X490 Service Manual

Flow Chart of Troubleshooting

7-14. DCS Transmitter

TX ON (0Level)
U 1 00 P i n 7
> = 20 d B m
No
U 1 00 P i n 9
> = 20 d B m
No
U 1 02 Pi n 3 1
> = 20 d B m
No
U 1 02 Pi n 3 7
> = 3 d B m
No
OSC100 p i n 2
> = 6 B m
No
U 1 01 P i n 6 , 7 , 8 , 9
> = 500m V
No
Chec k U 2 02
END
Y e s
R e sold e r CN101, C102
Y e s
Y e s
R e sol d e r C11 7 , L11 6
Y e s
Y e s
R e sold e r R 1 15, R 1 20, R 1 21
Y e s
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung ' s authorization
Chec k U 1 00
p i n 2= L , p i n 4 = L , p i n 8= H
Chec k U 1 02
+ V B A T T(p i n 4 2 , 4 3 )
OK ?
Chec k U 1 01 Y e s
p i n 4 > = 4 . 0 V
p i n 22 , 28 > = 2 . 7 V
7- 28
Y e s
Chan g e
or R e sold e r U 1 00
No
Chec k A N T Sw i t ch
control ci r cu i t
Y e s
R e sol d e r or chan g e U 1 02
or chec k P A M control
s i g n al
No
Chec k + V B A T T
Chec k & R e sol d e r
R F PS U p a rt
No
R e sol d e r U 1 01
or check Tx c p o (R 1 29)