Samsung SCH-A205 Service Manual

DUAL MODE(CDMA/AMPS) PORTABLE TELEPHONE SCH-A205

SERVICE

Manual

DUAL MODE TELEPHONE

CONTENTS

1. General Instruction

2. Specification

3. Circuit Description

4. NAM Programming

5. Test Procedure & Test Command

6. Electrical Parts List

7. Block Diagram

8. PCB Diagram

9. Schematic Diagrams

10. Exploded View & Its Part List

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 specifications 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 (F

-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(F

+130.38MHz)

1st(F

+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

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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

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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 f

+20KHz ~ f0+45KHz

above 26 dB

For modulation by voice and SAT f

+45KHz

above 63 +10 LOG (PY) dB

For modulation by WBD(without SAT) and ST (with SAT) f

+45KHz ~ f0+60KHz above 45 dB

+60KHz ~ f0+90KHz above 65 dB

+90KHz ~ 2f

above 63 +10 LOG (PY) dB

(where f

=carrier frequency

PY=mean output power in watts)

Harmonic and conducted Spurious Emissions below 43 + 10 LOG (PY) dB

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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

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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

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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) : ABand 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

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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 1stCDMA 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.

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.

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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 1stCDMA 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 1stCDMA 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 1stlockout 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

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

In/Out

Directional

Coupler

Test Jig

To A-Out

To A-In

DC Power Supply

(+3.93V)

Audio

Out

Audio

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 CDMATest 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

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