Samsung SCH-470 service manual, samsung service manuals schematy serwisowki
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CDMA Portable
Cellular Telephone
SCH-470
SERVICE
Manual
CDMA Portable Cellular Telephone
CONTENTS
1. General Introduction
2. Specification
3. NAM Programming
4. Data Tr a n s f e r
5. Circuit Description
6. Exploded View and Its Parts List
7. PCB Diagrams
8. Tr o u b l e s h o o t i n g
9. Test Command Ta b l e
10. Block & Circuit Diagrams
£
Samsung Electronics Co.,Ltd. APR. 1998.
Printed in Korea
Code No. : GH68-60687A
1 . General Int roduct ion
The SCH-470 cellular phone functions as only digital cellular phone working in CDMA (Code Division
Multiple Access) mode. CDMA type digital mode applies DSSS (Direct Sequential Spread spectrum) mode
which first came to be used in the military.
The DSSS reduces channel cross talk and allow to use one frequency channel by multiple users in the same
specific area, resulting in increase of channel capacity to about ten times compared to that of analog mode
currently used.
Soft/Softer Handoff, Hard Handoff, and Dynamic RF Power Control technologies are combined into this
phone to reduce the call drop while usage.
CDMA digital cellular network consists of MSO (Mobile Switching Office), BSC (Base Station Controller),
BTS (Base Station Transmission System), and MS (Mobile Station). MS meets the specifications of the below:
¶U
IS-95A : Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum
Cellular System
¶U
IS-96A : Speech Service Option 1 Standard for Dual-Mode Wideband Spread Spectrum Cellular Systems
¶U
IS-98A : Standards for Dual-Mode Wideband Spread Spectrum Cellular Mobile Station
¶U
IS-126 : Mobile Station Loopback Service Options Standard
SCH-470 is composed of main handset, rapid charger, cradle, two batteries.
Samsung Electronics
1-1
General Introduction
1.1 General
¶
Frequency Range
Transmitter
U
: 824.64 ~ 848.37 MHz
Receiver
: 869.64 ~ 893.37 MHz
¶
Channel Spacing
: 1.23 MHz
U
¶
Number of Channels
: 20 FA
U
¶
Duplex Spacing
: 45 MHz
U
°
MSC Transmitter Frequency
FA NO. CH. NO. CENTER FREQUENCY
FA NO. CH. NO. CENTER FREQUENCY
1
1011
824.640MHz
11
404
837.120MHz
2
29
825.870MHz
12
445
838.350MHz
3
70
827.100MHz
13
486
839.580MHz
4
111
828.330MHz
14
527
840.810MHz
5
152
829.560MHz
15
568
842.040MHz
6
193
830.790MHz
16
609
843.270MHz
7
234
832.020MHz
17
650
844.270MHz
8
275
833.250MHz
18
697
845.910MHz
9
316
834.480MHz
19
738
847.140MHz
10
363
835.890MHz
20
779
848.370MHz
°
MSC Receiver Frequency
FA NO. CH. NO. CENTER FREQUENCY
FA NO. CH. NO. CENTER FREQUENCY
1
1011
869.640MHz
11
404
882.120MHz
2
29
870.870MHz
12
445
883.350MHz
3
70
872.100MHz
13
486
884.580MHz
4
111
873.330MHz
14
527
885.810MHz
5
152
874.560MHz
15
568
887.040MHz
6
193
875.790MHz
16
609
888.270MHz
7
234
877.020MHz
17
650
889.270MHz
8
275
878.250MHz
18
697
890.910MHz
9
316
879.480MHz
19
738
892.140MHz
10
363
880.890MHz
20
779
893.370MHz
1-2
Samsung Electronics
2 . Specif i cat i on
Frequency Range Transmitter
: 824.64 MHz ~ 848.37MHz
Frequency Range Receiver
: 869.64 MHz ~ 893.37 MHz
Waveform Quality
: above 0.944
Time Reference
: within °æ 1uS
RX Sensitivity
: £
104 dBm, FER = within 0.5%
Dynamic Range
: £
104 dBm ~ £
25 dBm, FER = within 0.5%
TX Output Power
: Maximum 320 mW (25dBm)
TX Frequency Deviation
: within °æ 300 Hz
Occupied Band Width
: 1.32 MHz
TX Conducted Spurious Emissions
: 900 kHz below £
42 dBc / 30 kHz
: 1.98 MHz below £
54 dBc / 30 kHz
Minimum TX Power Control
: below £
50 dBm
Open Loop Power Control
: £
25 dBm : £
57.0 dBm ~ £
38.5 dBm
£
65 dBm : £
17.5 dBm ~
£
1.5 dBm
£
104 dBm :
£
18.0 dBm ~
£
30.0 dBm
Standby Output Power
: below £
61 dBm
Closed Loop TX Power Control Range
: Test 1 beyond °æ 24 dB
Test 2 0 mS ~ 2.5 mS
Test 3 beyond °æ 24 dB
Test 4 beyond °æ 24 dB
Test 5 beyond °æ 24 dB
Size (mm)
: 114
°
50
°
22 (Standard battery)
114
°
50
°
27 (Extended-life battery)
Weight (g)
: 114 (Standard battery)
154 (Extended-life battery)
Samsung Electronics
2-1
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