Samsung SCH-A205 User manual

DUALMODE(CDMA/AMPS)
PORTABLETELEPHONE
SCH-A205
SERVICEManual
1. General Instruction
2.Specification
3.CircuitDescription
4.NAMProgramming
5.TestProcedure&TestCommand
6.ElectricalPartsList
7.Block Diagram
8.PCB Diagram
9.SchematicDiagrams
10.ExplodedView&ItsPartList
DUALMODETELEPHONECONTENTS

Samsung Electronics Co.,Ltd. Dec. 99
Pinted in Korea.
Code No.: GH68-02022A
ELECTRONICS

SAMSUNG Proprietary - Contents may change without notice 1-1
1. General Instruction
The SCH-A205 cellular phone functions as both analog cellular phone working in AMPS(Advanced
Mobile Phone Service) mode and 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/Sofer 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 specifi-
cations of the below :
¥ IS-95A : Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread
Spectrum Cellular System
¥ IS-96A : Speech Service Option 1 Standard for Dual-Mode Wideband Spread Spectrum Cellular
System
¥ IS-98A : Standards for Dual-Mode Wideband Spread Spectrum Cellular Mobile System
¥ IS-126 : Mobile Station Loopback Service Options Standard
SCH-A205 is composed of main handset, one battery(800mAh), ear-microphone, and rapid DTC.
Travel adaptor(or travel charger) and HFK is optional. Hands-Free Kit is designed to be operated in
full-duplex mode taking turn-around delay between the phone and the system into account.

SAMSUNG Proprietary - Contents may change without notice 2-1
2. Specification
2-1 General
ITEM
Tx Freq. range
Rx Freq. range
Channel Bandwidth
Channel Spacing
Number of Channel
Duplex Separation
Type of Emission
In/Output Impedance
Tx Intermediate Freq.
Rx Intermediate Freq.
Tx Local Freq.
Rx Local Freq
TCXO freq.
Freq. Stability
Operating Temperature
CDMA
824 ~ 849MHz
869 ~ 894MHz
1.23MHz
30KHz
832
45MHz
40K0F8W,40K0F1D
50ohm
130.38MHz
85.38MHz
1st(260.76MHz)
2nd(FTX+130.38MHz)
1st(FRX+85.38MHz)
2nd(170.76MHz)
19.68MHz
(FRX -45MHz) ±300Hz
-30°C ~ +60°C
AMPS
824 ~ 849MHz
869 ~ 894MHz
30KHz
30KHz
832
45MHz
40K0F8W,40K0F1D
50ohm
130.38MHz
85.38MHz
1st(260.76MHz)
2nd(FTX+130.38MHz)
1st(FRX+85.38MHz)
2nd(170.76MHz)
19.68MHz
±2.5ppm
-30°C ~ +60°C
Supply Voltage 3.75V
Size and Weight STD : 80mm X 43mm X 25.5mm, 85 g, 800 mA

SAMSUNG Proprietary - Contents may change without notice 2-2
2-2 Digital Mode
Waveform Quality 0.944 or more
Time Reference ±1uS or less
Rx Sensitivity and Dynamic Range -104dBm, FER=0.5% or less
-25dBm, FER=0.5% or less
Maximum TX Output Power 23dBm(200mW)
TX Frequency Deviation ±300Hz or less
Occupied Band Width 1.32MHz
TX Conducted Spurious Emission 900KHz : -42dBc / 30KHz below
1.98MHz: -54dBc / 30KHz below
Minimum TX Power Control below -50dBm
Open Loop Power Control -25dBm: -57.0dBm ~ -38.5dBm
-65dBm: -17.5dBm ~ + 1.5dBm
-104dBm: +18.0dBm ~ +30.0dBm
Standby Output Power below -61dBm
Colsed Loop TX Power Control Range Test1: ±24dB or less
Test2: 0mS ~ 2.5mS
Test3: ±24dB or more
Test4: ±24dB or more
Test5: ±24dB or more

SAMSUNG Proprietary - Contents may change without notice 2-3
2-3 ANALOG MODE
TRANSMITTER
RF output power 0.6W (+2/-4dB)
Carrier ON/OFF conditions
"ON" Condition within ±3dB of specification output (in 2mS)
"OFF" Condition below -60dBm (in 2mS)
Compressor
Compression Rate 2:1
Attack Time 3mS
Recovery Time 13.5mS
Reference Input Input level for producing a nominal ±2.9KHz peak
freqency deviation of transmitted carrier
Preamphasis 6dB/OCT within 0.3 ~ 3KHz
Maximum Freqency Deviation
F3 of G3 ±12KHz
Supervisory Audio Tone ±2KHz (±10%)
Signaling Tone ±8KHz (±10%)
Wideband Data ±8KHz (±10%)
Post Deviation Limiter Filter
3.0 ~ 5.9KHz above 40 LOG (F/3000) dB
5.9 ~ 6.1KHz above 35 dB
6.1 ~ 15KHz above 40 LOG (F/3000) dB
Over 15KHz above 28 dB
Spectrum Noise Suppression
For all modulation
f0+20KHz ~ f0+45KHz
above 26 dB
For modulation by voice and SAT
f0+45KHz
above 63 +10 LOG (PY) dB
For modulation by WBD(without SAT)
and ST (with SAT)
f0+45KHz ~ f0+60KHz above 45 dB
f0+60KHz ~ f0+90KHz above 65 dB
f0+90KHz ~ 2f0above 63 +10 LOG (PY) dB
(where f0=carrier frequency
PY=mean output power in watts)
Harmonic and conducted Spurious Emissions below 43 + 10 LOG (PY) dB

SAMSUNG Proprietary - Contents may change without notice 2-4
RECEIVER
De-Emphasis -6dB / OCT within 0.3 ~3KHz
Expander 1:2
Expander Rate within 3mS
Attack Time within 13.5mS
Recovery Time
output level to a 1000Hz tone from a carrier within
Reference Input ±2.9KHz peak frequency deviation
Sensitivity 12dB SINAD / -116dBm
Intermodulation Spurious Response Attenuation avove 65dB
RSSI Range above 60dB
Protection Against Spurious above 60dB
Response Interference
In Band Conducted Spurious Emission
Transmit Band below -60dBm
Receive Band below -80dBm
Out of Band Conducted Spurious Emissions below -47dBm
Radiated Spurious Emission
Frequency Range Maximum Allowable EIRP
25 ~ 70 MHz -45dBm
70 ~ 130MHz -41dBm
130 ~ 174 MHz -41 ~ -32dBm
174 ~ 260 MHz -32dBm
260 ~ 470 MHz -32 ~ -26dBm
470 ~ 1GHz -21dBm

SAMSUNG Proprietary - Contents may change without notice 2-5
MSC Transmitter Frequency
FA NO. CH NO. Center Frequency FA NO. CH NO. Center Frequency
1 1011 824.64MHz 11 404 837.12MHz
2 29 825.87MHz 12 445 838.35MHz
3 70 827.10MHz 13 486 839.58MHz
4 111 828.33MHz 14 527 840.81MHz
5 152 829.56MHz 15 568 842.04MHz
6 193 830.79MHz 16 609 843.27MHz
7 234 832.02MHz 17 650 844.27MHz
8 275 833.25MHz 18 697 845.91MHz
9 316 834.48MHz 19 738 847.14MHz
10 363 835.89MHz 20 779 848.37MHz
MSC Receiver Frequency
FA NO. CH NO. Center Frequency FA NO. CH NO. Center Frequency
1 1011 869.64MHz 11 404 882.12MHz
2 29 87.087MHz 12 445 883.35MHz
3 70 872.10MHz 13 486 884.58MHz
4 111 873.33MHz 14 527 885.81MHz
5 152 874.56MHz 15 568 887.04MHz
6 193 875.79MHz 16 609 888.27MHz
7 234 877.02MHz 17 650 889.27MHz
8 275 878.25MHz 18 697 890.91MHz
9 316 879.58MHz 19 738 892.14MHz
10 363 880.89MHz 20 779 893.37MHz

SAMSUNG Proprietary - Contents may change without notice 2-6
2-4 CDMA Debug Display Information (menu 9 000000 1)
IN IDLE MODE
Sxxxxx : SID (System Identification) toggle
Nxxxxx : NID (Network Identification) toggle
• SIx : Slot cycle index (lowest between the system and the
phone will be used)
• Handset Status : 0-Acquisition
1-Synchronization
2-Paging(Idle)
3-Traffic Initialization
4-Traffic Mode
5-Exit
• T-xx : Tx adjust, Value ranges from +63~-63dB
• Dxxx : sector power in dBm
• -xx : Ec/Io
• Pxxx : PN offset
• CHxxxx : channel number
• TEx : Tx vocoder rate (8 is full rate, 1 is 1/8th rate)
E : Echo canceler
• REx : Rx vocoder rate (8 is full rate, 1 is 1/8th rate)
• xx : Walsh code used in traffic channel
• SIDxxxxx : FM Home System ID
• PWRx : Power Level 0~7
• SATx : Supervisory Audio Tone code (0~3)
• x (Using Frequency Band) : A Band or B Band
• RSSIxxx : RSSI value
• CHxxx : Using Channel
S xxxxx SI x x
T-xx D xxx -xx
P xxx CH xxxx
2-5 FM Debug Display Information (menu 9 000000 1)
SID xxxxx x
PWR x RSSI xxx
SAT x CH xxxx
TE x RE x xx x
T-xx D xxx -xx
P xxx CH xxxx
IN CONVERSATION MODE

SAMSUNG Proprietary - Contents may change without notice 4-1
4. NAM Programming
NAM feature can be programmed as follows
1. Press Menu+6+0 to enter the NAM programming mode, and enter the service code.
2. If you enter the NAM programming mode, each item shows the currently stored data
Go to the next item by pressing the OK key
3. You can modify the data by entering a new data and store it by pressing the OK key
4. If you enter a wrong digit press the CLR key to delete the last digit.
Press and hold the CLR key to delete all digits
5. To scroll items backwards or forwards without changing, push the OK(scroll) key to the up or down.
6. After finishing the NAM programming, press the END key to exit the NAM pragramming mode.
LCD Display Key Input Function
Menu+6+0+
service code Enter the NAM programming mode
NAM program
1:Setup NAM1 1 Chose 'Setup NAM1'
2:Setup NAM2
NAM1 New data Phone number is displayed.
Phone # or To change the phone number, enter the new one.
3003003000 OK Press the OK key to store it.
NAM1 New data Directory number is displayed.
Directory # or To change the directory number, enter the new one.
3003003000 OK Press the OK key to store it.
NAM1 The roaming list is enabled or not.
Activate PRL OK To change sytem selection operaiton push the OK(scroll) key
No to the right or left. Press the OK key to store it.
NAM1 New data Analog home system ID, current status is displayed.
Anlg HomeSID or To change the SID, enter the new one.
32768 OK Press the OK key to store it
NAM1 New data 1st CDMA home system ID, current status is displayed.
Dgtl HomeSID or To change the SID, enter the new one.
32768 OK Press the OK key to store it
NAM1 To program the more NAM item push the OK(scroll) key to
More Prog.? OK the right or left. Press the OK key.
No If service code prompt is displayed, you have to enter the
service code.

SAMSUNG Proprietary - Contents may change without notice 4-2
LCD Display Key Input Function
More NAM programming mode
NAM program
1:General 1 Chose 'General'
2:Setup NAM1
3:Setup NAM2
General ESN OK Electronic Serial Number of the phone is displayed.
B0000000
General CAIversion OK Common Air Interface version is displayed.
3
General To change Vocoder rate, push the OK(scroll) key to the right
VOC Select OK or left.
SO_EVRC_FORC Press the OK(scroll) key to store it
General SCM OK Station Class Mark is displayed.
00101010
General 6-digit code
Service Code OK Service Programming Code is displayed.
626626
General 4-digit code Security(Menu+0) lock code is displayed.
Lock Code OK To changed the lock code, enter the new lock code.
0000 Press the OK key to store it.
General Slot mode operation is enabled or not
Slot Mode OK To change Slot mode opration, push the OK(scroll) key to the
Yes right or left.
Press the OK key to store it.
General New data Slot Cycle Index
Slot Index or The higher, the longer sleeping time
2 OK To change Slot Cycle Index, enter the new data from 0 to 7
Press the OK key to store it.

SAMSUNG Proprietary - Contents may change without notice 4-3
LCD Display Key Input Function
General Roundup Timer
Roundup Timer OK To change Slot mode opration, push the OK(scroll) key to
No the right or left.
Press the OK key to store it.
NAM program
1:General 2 Chose 'Setup NAM1'
2:Setup NAM1
3:Setup NAM2
NAM1 Digital New data IMSI Mobile Country Code, current code is displayed.
IMSI_MCC or To change the MCC, enter the new one.
454 OK Pres the OK key to store it.
NAM1 Digital New data IMSI Mobile Network Code, current code is displayed.
IMSI_MNC or To change the MNC, enter the one.
05 OK Press the OK key to store it.
NAM1 Digital New data Phone number is displayed.
Phone # or To change the phone number, enter the new one.
8520000000 OK Press the OK key to store it.
NAM1 Digital New data Directory number is displayed.
Directory # or To change the directory number, enter the new one.
8520000000 OK Press the OK key to store it.
NAM1 Digital New data Primary CDMA channel for system A
Pchn Sys A or To change the channel, enter the new one.
283 OK Press the OK key to store it.
NAM1 Digital New data Primary CDMA channel for system B
Pchn Sys B or To change the channel, enter the new one.
384 OK Press the OK key to store it.
NAM1 Digital New data Secondary CDMA channel for system A
Schn Sys A or To change the channel, enter the new one.
691 OK Press the OK key to store it.
NAM1 Digital New data Secondary CDMA channel for system B
Schn Sys B or To change the channel, enter the new one.
777 OK Press the OK key to store it.

SAMSUNG Proprietary - Contents may change without notice 4-4
LCD Display Key Input Function
NAM1 Digital New data 1st CDMA home system ID, current status is displayed.
Home SID 01 or To change the SID, enter the new one.
10641 OK Press the OK key to store it
NAM1 Digital New data 1st CDMA home network ID, current status is displayed.
Home NID 01 or To change the NID, enter the new one.
65535 OK Press the OK key to store it
Repeated to the SID 20 and NID 20
NAM1 Digital New data 1st lockout system ID, current status is displayed.
LockoutSID01 or To change the lockout SID, enter the new one.
8103 OK Press the OK key to store it.
Repeated to the lockout SID 10
NAM1 Digital
CDMA HomeSID OK
Yes
NAM1 Digital
CDMA fSID OK
Yes
NAM1 Digital
CDMA fNID OK
Yes
NAM1 Digital OK CDMA Access Overload Class, current status is displayed.
ACCOLC
0
NAM program Scroll
1:General and You can programm the NAM2 by chosing 'Setup NAM2'.
2:Setup NAM1 OK
3:Setup NAM2
Autonomous registeration status indicator, current status is
displayed.
To change sytem selection operaiton push the OK(scroll) key
to the right or left.
Press the OK key to store it.

SAMSUNG Proprietary - Contents may change without notice 5-1
5. Test Procedure
5-1 Configuration of Test
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
CAUTION : The test jig and data cable has a voltage drop of 0.18V at FM Max power output you’d for normal
test condition.
(Nominal voltage of battery is 3.75V at cellular phone)

5-2
5-2 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
Test Jig
T
E
S
T
A
U
T
O
P
A
C
K
UP:AUTO POWER ON
DOWN:NOT USE
AUDIO SELECT
LEPT:AUDIO IN
RIGHT:AUDIO OFF
DH25 CONNECTOR
CONNECT TO
DB25 CONNECTOR
OP TEST CABLE
CONNECT TO
AUDIO OUT PORT
OF TEST
EQUIPMENT
CUSE BNC CABLE
CONNECT TO
AUDIO IN PORT
OF TEST
EQUIPMENT
CUSE BNC CABLE
NOT USED
DES CONNECTOR
CONNECT TO JEN
PC SERIAL PORT
BJ11 CONNECTOR
CONNECT TO HP
SERIAL PORT
DC POWER INPUT PORT
CHANGE VOLTAGE LEVEL
BY MODEL(6dr? avde)
RED:+
BLACK : END

SAMSUNG Proprietary - Contents may change without notice 5-3
5-3 TEST CABLE DESCRIPTION FOR SCH-A205
1. TEST CABLE
2. TEST CABLE CONNECTIONS
1 MHC 172
2 RF CABLE (1.4 dB Loss in 800MHz)
3 BNC CONNECTOR (RF)
4 PLUG CONNECT TO SCH-N100/N101/N105
5 DATA CABLE
6 Dsub 25PIN CONNECTOR (DATA)

SAMSUNG Proprietary - Contents may change without notice 5-4
3. Dsub 25 PIN CONNECTOR PIN DESCRIPTION (TEST CABLE 1, BACK SIDE)
DATA Dsub CONN.
DESCRIPTION PIN NO.
V_F 12
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 21
HP_PWR 7
RI
CD
RTS
CTS
DTR
14 16 18 20 22 24
15 17 19 21 23 25
123456789101113
12

SAMSUNG Proprietary - Contents may change without notice 5-5
5-4 Test Procedure
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 “0 1” is Suspend.
C. The command "21" is mode and channel change.
"10000" or "10001" : AMPS's Sytem A or Sytem B
"20363"
and Push the Navigation key to save.
C. The command "21" is mode and channel change.
"20363" : CDMA 363CH
and Push the Navigation key to save.
D. To finish the Test Mode, You should enter the command "0 2".
2. CDMA Channel Selection and Tx Power Output Level Control
2-1 CDMA
A. Enter to Test Mode ( "* 7 5 9 # 8 1 3 5 8 0" ).
B. "0 1" : Suspend.
C. The command "21" is mode and channel change , press "OK" to save.
"20363"
D. To finish the Test Mode, You should enter the command "0 2",
and enter to Test Mode ("* 7 5 9 # 8 1 3 5 8 0").
"0 1" : Suspend.
Channel number
Mdoe : CDMA
Channel number
Mdoe : CDMA

SAMSUNG Proprietary - Contents may change without notice 5-6
E. "0 9 0 363#" : Set to '0363' channel.
F. "0 7" : Carrier On.
G. The command "73" is ON/OFF of Tx drive Amp.
In case of Tx PWR output bellow - 6dBm, set to "0".
In case of Tx PWR output above - 6dBm, set to "1".
H. "3 4" : Spread spectrum to 1.23MHz band width.
I. "7 1 * * * " : Adjust RF power level.
"* * *" means AGC level and AGC level range is f rom 000 to 511.
2-2.AMPS(FM)
A. Enter to Test Mode ("* 7 5 9 # 8 1 3 5 8 0").
B. "0 1" : Suspend.
C. The command "21" is mode and channel change
"10000" or "10001" : AMPS's Sytem A and Sytem B
and Push the Navigation key to save.
D. To finish the Test Mode, You should enter the command "0 2",
and enter to Test Mode ("* 7 5 9 # 8 1 3 5 8 0").
"0 1" : Suspend.
E. "4 6" : Vocoder initial to Analog mode.
F. "0 9 0 363#" : Set to '0363' channel.
G. "0 7" : Carrier On.
H. The command "73" is ON/OFF of Tx drive Amp. In case of AMPS, set to "1".
I. "7 2 * * * " : Output RF power level is set as power level 2
"* * *" means AGC level and AGC level range is f rom 0 to 511.
J. "1 0 2" : RF Power level control, 2(0~7) means power level .

SAMSUNG Proprietary - Contents may change without notice 5-7
3. CDMA
TEST ITEMS PROCEDURE
1. PREPARANCE Set test equipments up.
"* 7 5 9 # 8 1 3 5 8 0" : Enter the Test Mode
"0 1" : Suspend
"0 4" : Current Mode Check
Conf irm that the phone is in the "CDMA Mode".
(If not CDMA Mode, Use Test Command "21""2XXXX" and Push
the Navigation Key to "OK", and enter "0 2" to restart)
If you select a wrong key, press "#", then enter new command.
To exit the Test Mode at any time, just press [0 2].
2. FREQUENCY "0 1" : Suspend.
ACCURACY "0 9 0 363#" : Set channel to 363.
"0 7" : Carrier On.
"7 3" : ON/OFF of Tx drive Amp.
In case of Tx PWR output bellow - 6dBm, set to "0".
In case of Tx PWR output above - 6dBm, set to "1".
"7 1 3 60#" : Set AGC level.
Measure the TX f requency : 835.89MHz°æ300Hz.
3. OCCUPIED CDMA "0 1" : Suspend.
BANDWIDTH "0 9 0 363#" : Set channel to 363.
"0 7" : Carrier On.
"3 4" : Spread spectrum.
"7 3" : ON/OFF of Tx drive Amp.
In case of Tx PWR output bellow - 6dBm, set to "0".
In case of Tx PWR output above - 6dBm, set to "1".
"7 1 X XX#" : Enter AGC Code(XXX) to adjust RF Output Power.
Measure the bandwidth (spec: 1.32MHz).
4. LIMITATIONS ON "0 1" : Suspend.
EMISSIONS "0 9 0 363#" : Set channel to 363.
"0 7" : Carrier On.
"7 3" : ON/OFF of Tx drive Amp.
In case of Tx PWR output bellow - 6dBm, set to "0".
In case of Tx PWR output above - 6dBm, set to "1".
"3 4" : Spread spectrum.
"7 1 X XX#" : Enter AGC Code(XXX) to adjust RF Output Power.
Measure the spurious at FC ±900kHz, FC ±1.98MHz, 2FC, 3FC, 1/2FC.
spec: FC ±900kHz below 42dBc/30kHz
FC ±1.98MHz below 54dBc/30kHz
Outside Receive Band 43+10log (PY)
PY: Mean Output Power in watts.