Gsm Transmitter - Samsung SGH-X490 Service Manual

Flow Chart of Troubleshooting

7-12. GSM Transmitter

TX ON (5Level)
U 1 00 P i n 7
> = 20 d B m
No
U 1 00 Pi n 11
> = 20 d B m
No
U 1 02 P i n 6
> = 20 d B m
No
U 1 02 Pi n 4 8
> = 3 d B m
No
OSC100 p i n 1
> = 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 sold e r C119, L117
Y e s
Y e s
R e sold e r R 1 07 , R 1 11, R 1 12
Y e s
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Chec k U 1 00
p i n 2= L , p i n 4 = H , p i n 8= L
Chec k U 1 02
+ V B A T T( p i n 4 2 , 4 3 )
OK ?
Chec k U 1 01
p i n 4 > = 4 . 0 V
p i n 22 , 28 > = 2 . 7 V
7- 24
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
Y e s
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)