Samsung SCH-870 Service Manual
DUAL MODE(CDMA+AMPS)
PORTABLE
TELEPHONE
SCH-870
2
ABC
3
END/
DEF
5
JKL
6
MNO
4
GHI
8
TUV
9
WXYZ
7
PQRS
0
OPER
1
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SEND
MENU OK /
Manual
DUAL MODE TELEPHONE CONTENTS
1. Specification
2. Nam Programming
3.Test Commands & Test Procedure List
4.Test Procedure
5. Exploded View & its Parts List
6. Electrical Parts List
7. Block Diagram
8. PCB Diagram
9. Schematic Diagrams
SERVICE
Samsung Electronics Co.,Ltd. Dec. 00
Pinted in Korea.
Code No.: GH68-01765A
ELECTRONICS
2. Nam Programming
LCD Display Key in Function
menu + 60,626 -selects NAM programming
NAM program 1 -choose ‘Setup NAM1’
1:Setup NAM1
2:Setup NAM2
NAM1
Phone # -directory number
1234567890 Phone number -to change, enter new one.
OK -store it.
NAM1
Directory # -directory number
1234567890 Phone number -to change, enter new one.
OK -store it.
NAM1
Activate PRL -PRL status
No < or > -to activate PRL, press < or >
OK -store it.
NAM1
Anlg HomeSID System ID for home, current ststus is displayed.
4369 ID number -to change, enter new one.
OK -store it.
NAM1
Dgtl HomeSID System ID for home, current ststus is displayed.
4369 ID number -to change, enter new one.
OK -store it.
NAM1
More Prog.? General NAM setup
Yes 835235 -to change, press < or >
OK -store it
Samsung Electronics
2-1
NAM program 1 Choose ‘ General’
1. General
2. Setup NAM1
3. Setup NAM2
General
ESN -Electronic Serial Number of the phone is displayed
B0000000 OK -Press OK, to view next status item.
General
CAI version -Common Air Interface version is displayed
3 OK -Press OK, to view next status item.
General
VOC Select
SO_VOIC_EVRC < or > -to change Vocoder rate, press < or >
OK - store it
General
SCM -Station Class Mark displays the power class,
01101010 transmission, slotted class, dual mode.
OK -Press OK, to view next status item.
General
Service Code Service code, current ststus is displayed
835235 6-digit code -to change, enter new code.
OK -store it
General
Lock Code Lock code, current ststus is displayed
0000 4-digit code -to change, enter new code.
OK -store it
General
Slot Mode Slot mode. ‘Yes’indicates the slot mode.
Yes < or > -changes the status.
OK -store it.
General
Slot Index Slot mode index. The higher, the longer sleeping time
2 0-7 -to change, enter new one.
OK -store it.
General
Roundup Timer Roundup Timer.
No < or > -to change the status.
OK -store it.
2-2
Samsung Electronics
LCD Display Key in Function
NAM program 3 choose ‘Setup NAM2’
1. General
2. Setup NAM1
3. Setup NAM2
NAM2 Digital
IMSI_MCC IMSI Moble Country Code, current code is displayed.
000 number -to change, enter new one.
OK -store it.
NAM2 Digital
IMSI_MNC
IMSI Mobile Network Code, current code is displayed.
00 number -to change, enter new one.
OK -store it.
NAM2 Digital
Phone # -Phone number
1234567890 Phone number -to change, enter new one.
OK -store it.
NAM2 Digital
Directory # -directory number
1234567890 Phone number -to change, enter new one.
OK -store it.
NAM2 Digital
Home SID 01
1st CDMA Home system ID, current status is displayed
1700 Phone number -to change, enter new one.
OK -store it.
NAM2 Digital
Home NID 01
1st CDMA Home Network ID, current status is displayed
1 Phone number -to change, enter new one.
OK -store it.
NAM2 Digital
Home SID 02
2nd CDMA Home system ID, current status is displayed
1700 Phone number -to change, enter new one.
OK -store it.
NAM2 Digital
Home NID 02
2nd CDMA Home Network ID, current status is displayed
2 Phone number -to change, enter new one.
OK -store it.
————— repeated to SID 20 & NID 20——————————
NAM2 Digital
Lockout SID01 1st lock system ID,current status is displayed.
0 ID number -to change, enter new one.
OK -store it.
Samsung Electronics
2-3
LCD Display Key in Function
NAM2 Digital
Lockout SID02 2nd lock system ID,current status is displayed.
0 ID number -to change, enter new one.
OK -store it.
—————- repeated to Lockout SID10————————————-
NAM2 Digital
CDMA Home SID CDMA Home system ID, current status is displayed
Yes < or > -changes the status.
OK -store it.
NAM2 Digital
CDMA fSID CDMA foreign SID, current status is displayed.
Yes < or > -changes the system.
OK -store it.
NAM2 Digital
CDMA fNID CDMA foreign NID, current status is displayed.
Yes < or > -changes the system.
OK -store it.
NAM2 Digital
CDMA ACCOLC
CDMA Access Overload Class, current status is displayed.
6 class number -to change, enter new one.
OK -store it.
NAM2 Analog
Phone # -Phone number
1234567890 Phone number -to change, enter new one.
OK -store it.
NAM2 Analog
Directory # -directory number
1234567890 Phone number -to change, enter new one.
OK -store it.
NAM2 Analog
Home SID Analog Home system ID, current status is displayed
1 Phone number -to change, enter new one.
OK -store it.
NAM2 Analog
Auto Reg Auto Registration, current status is displayed
Yes < or > -changes the status.
OK -store it.
NAM2 Analog
ACCOLC
Analog Access Overload Class, current status is displayed.
6 class number -to change, enter new one.
OK -store it
2-4
Samsung Electronics
LCD Display Key in Function
3. Test Commands & Test Procedure List
3-1 T est Command T able
To change the phone from normal mode to test mode, you should enter the following keys :
Press [*759#813580]
Command No Command SW Name Description
01(1F,0,0)
02(3F,0,0)
04(1D,0,1)
07(81,0,0)
08(82,0,0)
09(83,4,0)
10(84,1,0)
11(85,0,0)
12(86,0,0)
13(87,0,0)
14(88,0,0)
15(89,10)
16(8F,0,0)
17(90,0,0)
18(92,20)
20(9E,3,0)
21(9C,5,0)
22(91,96,96)
23(95,3,4)
24(9F,7,8)
25(92,0,0)
26(93,0,0)
27(96,0,0)
28(97,0,0)
30(9D,15,0)
31(00,1,0)
32(A0,1,0)
33(A1,0,0)
34(A2,0,0)
37(A5,3,0)
38(A6,3,0)
39(A7,3,0)
40(A7,3,0)
41(A9,3,0)
42(AA,1,0)
43(AB,0,0)
44(B0,0,0)
45(B1,0,0)
46(B2,0,0)
47(B3,3,0)
T_SUSPEND_I
T_RESTART_I
T_GET_MODE_I
T_CARRIERON_I
T_CARRIEROFF_I
T_LOADSYN_I
T_PWRLEVEL_I
T_RXMUTE_I
T_RXUNMUTE_I
T_TXMUTE_I
T_TXUNMUTE_I
T_VOC_ESEC_I
T_STON_I
T_STOFF_I
T_LCD_CONTRAST_I
T_LNA_GAIN_WR_I
T_TEST_SYS_I
T_SNDNAM_I1)
T_SNDVERSION_I1)
T_SNDESN_I1)
T_BACKLIGHT_ON_I
T_BACKLIGHT_OFF_I
T_DATASVC ON
T_DATASVC OFF
T_PLINE_I
T_AUTOANSWER_I
T_SATON_I*2)
T_SATOFF_I*
T_CDATA_I
T_RXRAS_FLATNESS_I
T_VOC_ENC_OFFSET_I
T_VOC_DEC_OFFSET_I
T_VOC_CDMA_UNITY_GAIN_I
T_VOC_FM_HFRX_UPGAIN_I
T_DTMFON_I2)
T_DTMFOFF_I
T_COMPANDORON_I
T_COMPANDOROF_I
T_FM_VCLINE_I*
T_FM_AUD_GAIN_I
Enter to test menu
Escape from test menu
Get mode CDMA/FM
Turn on the carrier
Turn off the carrier
Load the synthesizer for locking
Change RF power level
Mute rx audio
Unmute rx audio
Mute tx audio
Unmute tx audio
Echo Canceller On/Off
Transmit a continuous Signaling Tone(ST)
Stop transmit a continuous Signaling Tone(ST)
Tune LCD contrast
write LNA gain for IMD test
set test system & Channel
Display & Send NAM Information
Display & Send Software Version
Display & return ESN
Backlight on
Backlight off
Data Service On
Data Service Off
Display and return production date
Enable Auto-answer mode
Enable the transmission of SAT
Disable the transmission of SAT
Continuously send TX Control data
Adjust CDMA RX RAS flatness.
Vocoder ENC offset
Vocoder DEC offset
Vocoder CDMA unity gain
Vocoder FM hfrx upgain
Turn on DTMF
Turn off DTMF
Turn on compandor
Turn off compandor
Enter FM voice state
FM audio gain
Samsung Electronics
3-1
Command No Command SW Name Description
48(B4,0,0)
49(B5,0,0)
50(B6,0,4)
52(B9,0,8)
53(BA,3,0)
54(BB,7,8)
55(AC,1,0)
57(BC,0,0)
58(BD,0,0)
59(BE,0,0)
60(BF,3,0)
61(C0,3,0)
62(C1,3,0)
63(C2,3,0)
64(C3,3,0)
65(C4,3,0)
66(C5,3,0)
67(C6,0,6)
68(C8,0,3)
69(C9,0,3)
70(CA,3,0)
71(D1,3,0)
72(D2,3,0)
73(D3,1,0)
75(D5,0,3)
76(D6,3,0)
77(D7,0,3)
79(D9,1,0)
80(DA,0,0)
81(E3,0,0)
82(E4,0,0)
83(E5,0,0)
84(E6,0,0)
85(E7,0,0)
86(E8,0,0)
87(E9,0,0)
88(EA,3,0)
89(EB,3,0)
90(F0,2,0)
92(D4,5,0)
93(F3,4,0)
96(F6,4,0)
97(F2,4,0)
98(F8,3,0)
99(FC,4,0)
T_VIBRATOR_ON_I
T_VIBRATOR_OFF_I
T_BATT_TYPE_I
T_HW_VERSION_I
T_CARRIER_I
T_VOC13K_I
T_EXT_AUDIO_I
T_MIC_ON_I
T_MIC_OFF_I
T_ALLPATH_I
T_FM_TX_GAIN_I2)3)
T_FM_RX_GAIN_I2)3)
T_DTMF_VOL_TX_I2)3)
T_TX_LIMITER_I2)3)
T_FM_SAT_LEVEL_I2)3)
T_FM_FREQ_SGAIN_I2)3)
T_FM_ST_GAIN_I2)3)
T_READ_BATT_I1)
T_VBATT1_I3)
T_VBATT2_I3)
T_WRITE_BATT_I3)3)
T_CDMA_TXADJ_I2)
T_FM_TXADJ_I2)
T_SET_PA_R_I2)
T_READ_RSSI_I3)
T_CDMA_CH_FLATNESS_BP_ON_I
T_READ_TEMP_I
T_BUZZER_ON_I2)
T_BUZZER_OFF_I
T_VOC_PCMLPON_I
T_VOC_PCMLPOFF_I
T_BYPASS_ON_I
T_BYPASS_OFF_I
T_SPEAKER_ON_I
T_SPEAKER_OFF_I
T_FM_LOOP_TEST_I
T_TRK_ADJ_I3)
T_CDTRK_ADJ_I
T_FM_CH_FLATNESS_I
T_TXRAS_ADJ_I
T_RXRAS_ADJ_I
T_CH_FLATNESS_I
T_FM_TX_PWR_I
T_TXRAS_ADJ_BP_ON_I
T_SND_GAIN_I
Activate a vibrator
Inactivate a vibrator
Battery Type
View HW version
Target Carrier option (Change banner)
Target Service option
External Audio Path On/Off
Unmute MIC Path
mute MIC Path
Tune on the all audio path
AMPS Tx Audio Gain Control
AMPS Rx Audio Gain Control
AMPS Tx DTMF Gain Control
AMPS Tx Limiter Gain Control
AMPS Tx SAT level Control
AMPS Tx Master Gain Control
AMPS Tx ST Gain Control
Saved Low battery value read
Set the low battey position in the standby
Set the low battey position in the talking
write a BATT
Sets tx_agc_adj for CDMA mode
Sets tx_agc_adj for AMPS mode
Sets PA R1,R0 range bits
Read a RSSI
Adjust CDMA TX low power RAS flatness
Read a TEMP
Buzzer on
Buzzer off
Turn on to play a PCM LOOP BACK
Turn off to play a PCM LOOP BACK
Set Low power mode
Set High power mode
Turn on the speaker path
Tturn off the speaker path
FM loop back
TRK LOCAL ADJUST
CDMA TRK LOCAL ADJUST
Adjust FM channel flatness
CDMA TX high power RAS table( not adjustable )
CDMA RX RAS table( not adjustable )
Adjust TX high power RAS
Adjust FM Power level 2 ~ 7
CDMA TX low power RAS table( not adjustable)
Mic/Speaker Gain control
3-2
Samsung Electronics
4. Test Procedure
4-1 List of Equipment
- DC Power Supply
- Test Jig
- Test Cable
- CDMA Mobile Station Test Set HP8924C, HP83236A, CMD-80, etc
- Spectrum Analyzer(include CDMA Test Mode) HP8596E
4-2 Configuration of Test
❈ CAUTION : The test jig and data cable has a voltage drop of 0.33V at FM Max power output,
you’d better set the DC power supply to 3.93V for normal test condition.
(Nominal voltage of battery is 3.6V at cellular phone)
Samsung Electronics
4-1
Spectrum Analyzer
RF In
HP8924C
RF
In/Out
Directional
Coupler
Test Jig
To A-Out
To A-In
DC Power Supply
(+3.93V)
Audio
Out
Audio
In
4-3 Test Cable Description for SCH-870
1. Test Cable
2. Test Cable Connections
1 MHC 172
2 RF CABLE 91.4db Loss for CDMA800 and AMPS
3 BNC CONNECTOR (RF)
4 PLUG CONNECT TO SCH-870
5 DATA CABLE
6 Dsub 25PIN CONNECTOR (DATA)
4-2
Samsung Electronics
1
4
5
6
2
3
3. Dsub 25 PIN CONNECTOR PIN DESCRIPTION (TEST CABLE 1, BACK SIDE)
DATA Dsub CONN.
DESCRIPTION PIN NO.
V_F 12,21
DGND 2, 4, 6, 13, 19
BATT 15, 16, 22
C_F 3,20
TX_AUDIO 5
DP_TX_DATA 7
RX_AUDIO 1
DATA Dsub CONN.
DESCRIPTION PIN NO.
DP_RX_DATA 8
HP_PWR 9
RI 10
CD 11
RTS 14
CTS 17
DTR 18
4. CONVERSION TABLE OF FREQUENCY vs CHANNEL
T Y P E CHANNEL CONVERSION EQUATION REMARK
TX 1 ≤ N ≤ 799 F=0.03 X N + 825.00 N ; CH NUMBER
FREQUENCY 990 ≤ N ≤ 1023 F=0.03 X (N-1023) + 825.00
F ; FREQUENCY
RX 1 ≤ N≤ 799 F=0.03 X N + 870.00
(AMPS/CDMA)
FREQUENCY 990 ≤ N ≤ 1023 F=0.03 X (N-1023) + 870.00
Samsung Electronics
4-3
14 15 16 17 18 19 20 21 22 23 24 25
1 2 3 4 5 6 7 8 9 10 11 12 13
4-4 T est Procedure
4-4-1 Change to Test Mode
A. To change the phone’s state from Normal Mode to Test Mode,You should enter the following keys.
“* 7 5 9 # 8 1 3 5 8 0”
B. The command “21” is mode and channel change , press “OK” to save.
“10000” or “10001” : AMPS’s Sytem A and Sytem B
“20363”
C. The command “0 1” is Suspend.
D. To finish the Test Mode, You should enter the command “0 2”.
4-4-2 Channel Selection and Tx Power Output Level Control
1.AMPS(FM)
A. Enter to Test Mode (“* 7 5 9 # 8 1 3 5 8 0”).
B. The command “21” is mode and channel change
“10000” or “10001” : AMPS’s Sytem A and Sytem B
C. To finish the Test Mode, You should enter the command “0 2”.
D. “0 1” : Suspend.
E. “4 6” : Vocoder initial to Analog mode.
F. “0 9 0 3 6 3 #” : Set to ‘0363’ channel.
G. “0 7” : Carrier On.
H. “9 7 * * * “ : Output RF power level is set as power level 2
“* * *” means AGC level and AGC level range is from 0 to 511.
I. “1 0 2” : RF Power level control, 2(0~7) means power level .
4-4
Samsung Electronics
Channel number
Mdoe : CDMA
2. CDMA
A. Enter to Test Mode ( “* 7 5 9 # 8 1 3 5 8 0” ).
B. The command “21” is mode and channel change , press “OK” to save.
“20363”
C. To finish the Test Mode, You should enter the command “0 2”.
D. “0 1” : Suspend.
E. “0 9 0 3 6 3 #” : Set to ‘0363’ channel.
F. “0 7” : Carrier On.
G. “3 4” : Spread spectrum to 1.23MHz band width.
H. “8 4” : High Power-mode On
I. “9 6 * * * “ : Output RF power level is set max power
“* * *” means AGC level and AGC level range is from 000 to 511.
Channel number
Mdoe : CDMA
Samsung Electronics
4-5
4-5 T est Procedure
1. AMPS(FM)
TEST ITEMS PROCEDURE
1. PREPARATION Set test equipments up.
Confirm that the phone is in the Analog Mode!
( “10000” or “10001” at Test Command “2 0”.)
“* 7 5 9 # 8 1 3 5 8 0” : Enter the Test Mode
“0 1” : Suspend
“4 6” : Initialize Vocoder in Analog mode
If a wrong key would be selected, press “#”, and then enter new command.
To exit the Test Mode at any time, just press [0 2].
2. RF “0 1” : Suspend.
POWER “4 6” : Initialize Vocoder in Analog mode.
“0 9 0 3 6 3 #” : Set channel to 363.
“0 7” : Carrier On.
“1 0 2” : RF Power level selection, “2” means one of the power levels (0~7).
Measurement of the Power Output Levels
Level RF Power
0 ~ 2 + 26.5 dBm + 0.3/-4 dB
3 + 23 dBm + 2/-4 dB
4 + 19 dBm + 2/-4dB
5 + 15 dBm + 2/-4 dB
6 + 12 dBm + 2/-4 dB
7 + 9 dBm + 2/-4 dB
“0 8” : Carrier off
Note 1 : In case of using the antenna cable, compensation for th cable loss should be added
(about 1.5dB).
Note 2 : To prevent phones from being damaged, they must be measured only by calibrated test
equipments.
Warning !
Adjustments without calibrated equipments can cause phones to be heated excessively and
would void the warranty.
3. TX “0 1” : Suspend.
FREQUENCY “4 6” : Initialize Vocoder in Analog mode.
“0 9 0 3 6 3 #” : Set channel to 363.
“0 7” : Carrier On.
Measure the TX frequency : 835.89 MHz ± 2.5ppm.
4. VOICE “0 1” : Suspend.
DEVIATION “4 6” : Initialize Vocoder in Analog mode.
“0 9 0 3 6 3 #” : Set channel to 363.
“0 7” : Carrier On.
“1 4” : TX Audio unmute.
Set the audio generator output to 1kHz, 3.0Vrms.
Measure the Tx voice deviation by using the HPF of 20Hz and the LPF of 99kHz
(spec : less than ±12kHz).
4-6
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