User Guide

SAMSUNG Proprietary-Contents may change without notice
SGH-A500 Flow Chart of Troubleshooting and Circuit Diagrams
6-9
11. DCS Reciever
● Flow Chart.(DCS : Rx Trouble Shooting)
Check RF(1845MHz)
Level at C112
>-55dBm
Replace or Resolder the CON101 &
C112
Check RF
Level at C223
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 at
L205 > -65dBm
Resolder or Replace L205,
F201
Check IF(360MHz)
Level at C229 >
Check the
Level(>-5dBm) and
Frequency
(1485MHz) 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
Having Some Defect at B'd → Need To send
to Korea
Resoder or Replace the OSC202, R226,
L206
Resolder or Replace the F204, L204, C228,
C234, L218
Check IF(360MHz)
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
<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.
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No No
No
No
No
No