Samsung SGH-D428 service manual, samsung service manuals schematy serwisowki
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GSM TELEPHONE
SGH-D428
GSM TELEPHONE
CONTENTS
1. Specification
2. Flow Chart of Troubleshooting
3. Exploded Views and Parts List
4. Electrical Parts List
5. Block Diagrams
6. PCB Diagrams
ⓒ
Samsung Electronics Co.,Ltd. Dec. 2004
Printed in Korea.
This Service Manual is a property of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
International and/or domestic law.
Code No.: GH68-06337A
BASIC.
1. SGH-D428 Specification
1. GSM General Specification
GSM900
Phase 1
EGSM 900
Phase 2
DCS1800
Phase 1
PCS1900
Freq. Band[MHz]
Uplink/Downlink
890~915
935~960
880~915
925~960
1710~1785
1805~1880
1850~1910
1930~1990
ARFCN range
1~124
0~124 &
975~1023
512~885
512~810
Tx/Rx spacing
45MHz
45MHz
95MHz
80MHz
Mod. Bit rate/
Bit Period
270.833kbps
3.692us
270.833kbps
3.692us
270.833kbps
3.692us
270.833kbps
3.692us
Time Slot
Period/Frame
Period
576.9us
4.615ms
576.9us
4.615ms
576.9us
4.615ms
576.9us
4.615ms
Modulation
0.3GMSK
0.3GMSK
0.3GMSK
0.3GMSK
MS Power 33dBm~13dBm 33dBm~5dBm 30dBm~0dBm 30dBm~0dBm
Power Class 5pcl ~ 15pcl
5pcl ~ 19pcl
0pcl ~ 15pcl
0pcl ~ 15pcl
Sensitivity
-102dBm -102dBm -100dBm -100dBm
TDMA Mux
8
8
8
8
Cell Radius
35Km
35Km
2Km
-
1-
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SGH-D428 Specification
2. GSM TX power class
TX Power
control level
GSM900
TX Power
control level
DCS1800
TX Power
control level
PCS1900
5
33
±
2dBm
0
30
±
3dBm
0
30
±
3dBm
6
31
±
2dBm
1
28
±
3dBm
1
28
±
3dBm
7
29
±
2dBm
2
26
±
3dBm
2
26
±
3dBm
8
27
±
2dBm
3
24
±
3dBm
3
24
±
3dBm
9
25
±
2dBm
4
22
±
3dBm
4
22
±
3dBm
10
23
±
2dBm
5
20
±
3dBm
5
20
±
3dBm
11
21
±
2dBm
6
18
±
3dBm
6
18
±
3dBm
12
19
±
2dBm
7
16
±
3dBm
7
16
±
3dBm
13
17
±
2dBm
8
14
±
3dBm
8
14
±
3dBm
14
15
±
2dBm
9
12
±
4dBm
9
12
±
4dBm
15
13
±
2dBm
10
10
±
4dBm
10
10
±
4dBm
16
11
±
2dBm
11
8
±
4dBm
11
8
±
4dBm
17
9
±
2dBm
12
6
±
4dBm
12
6
±
4dBm
18
7
±
2dBm
13
4
±
4dBm
13
4
±
4dBm
19
5
±
2dBm
14
2
±
5dBm
14
2
±
5dBm
15
0
±
5dBm
15
0
±
5dBm
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2. SGH-D428 Flow Chart of Troubleshooting
1.Baseband
1. Power ON
'Power On' does not work
Yes
Check the current
consumption more
than 100mA
No
Download again
Yes
Check the VBAT
more than 3.3V
No
Charge the Battery
Yes
Check the pin
11 of U102 is
more than 2.8V
No
Check the C117
Yes
U102 pin 33,39
=2.8V
No
U102 pin 9
=1.8V
No
Check U102 and C116
Yes
Yes
Check the clock
signal at pin4 of
OSC801
Freq=13MHz ?
Vrms
≥
300mV ?
Vpp is around
900mVpp ?
No
Check the clock generation
circuit
Yes
Check the initial operation
END
2-
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