SAMSUNG Proprietary-Contents may change without notice
SGH-A500 Flow Chart of Troubleshooting and Circuit Diagrams
6-
7
9. GSM Reciever
●Flow Chart.(GSM : Rx Trouble Shooting)
Check RF(947.4MH z)
Level at C112
>-55dBm
Replace or Resolder the CON101 &
C112
Check RF
Level at C229
> -57dBm
Check the Crack
& Soldering of
U101
OK
Resolder or Replace the
U101
Check 0 ~ 0.5 V
at 2 pin, 10pin of
U101
Resolder the U105,
U104
Check RF Level
both side at C302
> -60dBm and
Almost Same Level
Resolder or Replace C302, L 207, L208,
F202
Check IF(360MH z)
L evel at C229 >
-30dBm
Check the
Level(>-5dBm) and
Frequency
(1307.4MHz)
RF_Out of OSC201
Check
Level(>0.6Vpp) and
Frequency(13MHz)
of OSC202
Check Voltage at
7, 19, 26, 30, 38,
39 pin of U201(2.6
~ 2. 9V)
Check the Pin connection(VRF1) Between
7, 19, 26, 30, 38, 39 pin of U201 and 31
pin of U601.
Check Voltage(2.6 ~
2.9) at 4 pin of
OSC202
Res older or Replace the F204, L 204, C228,
C234, L218
Check IF(360M Hz)
Level Both Side at
L209 > -40dBm and
Almost Same Level
Check the Baseband
Level(Vpp : 1V) at 8,
9 , 10, 11pin of
U201
Check the 2nd Local
Frequency(1440MHz)
on beside the 38 pin
of U202
Resolder or Replace the C239,
C222, R215
Resolder or Replace the OSC202, R226,
L206
Having Some Defect at B'd → Need To send
to Korea
<Test Condition>
1. Phone Tool Inline Mode :
- RF Mode : Rx Continuous.
- ARFCN : Rx 62Ch.
- Gain : Rx 88.
2. Generator RF Level :-50dBm.
3. Measure with Hewlett Packard 85024A active high frequency probe.
→ Measured Value is dependent on Probe Measured Point of Component.
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
