Samsung sgh-a500 Service Manual page 23

11. DCS Reciever
<Test Condition.>
1. Phone Tool Inline Mode :
- RF Mode : Rx Continuous.
- ARFCN : Rx 711Ch.
- 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.
● Flow Chart.(DCS : Rx Trouble Shooting)
Check RF (1845M Hz)
Level at C112
>-55dBm
Check RF
Level at C223
Check RF Level at
L205 > -65dBm
Check IF(360M Hz)
L evel at C229 >
Check IF(360MHz)
L evel Both Side at
L209 > -40dBm
and Almost Same
Level
Check the Baseband
Level(Vpp : 1V) at
8, 9 , 10, 11pin of
U201
SGH-A500 Flow Chart of Troubleshooting and Circuit Diagrams
No
Replace or Resolder the CON101 &
Yes
No
Check the Crack
& Soldering of
U101
Yes
Resolder or Replace the
U101
No
Resolder or Replace L205,
Yes
No
Level(>-5dBm) and
(1485MHz) RF_Out
Yes
Level(>0.6Vpp) and
No
Resolder or Replace the F204, L204, C228,
Yes
No
SAMSUNG Proprietary-Contents may change without notice
C112
Check 0 ~ 0.5 V
at 2 pin, 10pin of
OK
No
Resolder the U105,
F201
Check the Pin connection(VRF1) Between
7, 19, 26, 30, 38, 39 pin of U201 and 31
Check the
No
Frequency
of OSC201
Having Some Defect at B'd → Need To send
Yes
Check
No
Frequency(13MH z)
of OSC202
Resoder or Replace the OSC202, R226,
C234, L218
Check the 2nd Local
Frequency(1440MH z)
on beside the 38 pin
of U202
6-9
U101
No
U 104
pin of U601.
No
Check Voltage at
7, 19, 26, 30, 38,
39 pin of
U201(2.6 ~ 2. 9V)
to Korea
No
Check Voltage(2.6
~ 2.9) at 4 pin of
OSC202
Yes
L206
No
Resolder or Replace the C239,
C222, R215