Samsung SCH-A302 Manuale utente

SERVICE

Cellular Phone

SCH-A302

Manual

Cellular Phone CONTENTS

1. Specification

2. Trouble Shooting

3. Tune-up Procedure &

Test Procedure list

4. Frequency Synthesizer Circuit &

Spurious Radiation

Suppression Circuit

5. NAM Programming

6. Electrical Parts List

7. Exploded Views & Parts List

8. Block Diagram

9. PCB Diagrams

10. Circuit Description &

Circuit Diagrams

©Samsung Electronics Co.,Ltd. December. 2001

Pinted in Korea.

Code No.: GH68-02488A

BASIC.

ELECTRONICS

1. SCH-A302 Specification (REF TIA/EIA/IS-137-A-1)

1. GENERAL

SAMSUNG Proprietary-Contents may change without notice

1-1

ITEM CDMA

TX Freq. Range 824 ~ 849 MHz

RX Freq. Range 869 ~ 894 MHz

Channel Bandwidth 1.23 MHz

Channel Spacing 30 kHz

Number of Channels 20 FA

Duplex Separation 45 MHz

In/Output Impedance 50 Ω

TX Intermediate Freq. 130.38 MHz

RX Intermediate Freq. 85.38 MHz

TX Local Freq. 1st(FTX + 130.38 MHz)

2nd(260.76 MHz)

RX Local Freq. 1st(FTX + 210.38 MHz)

2nd(170.76 MHz)

TCXO freq. 19.68 MHz

Freq. Stability (FRX - 45 MHz) ± 350 Hz

Operating Temperature -30 °C ~ +60 °C

Supply Voltage + 3.8 V

SMALL : 81 x 42 x 21 mm 84 g

Size and Weight MIDDLE : 81 x 42 x 22 mm 87 g

LARGE : 81 x 42 x 25 mm 98 g

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1-2

SCH-A302 Specification

2. 800 MHz CDMA

2-1. GENERAL

TX Freq. Range 824 ~ 849 MHz

RX Freq. Range 869 ~ 894 MHz

Channel Bandwidth 1.23 MHz

Channel Spacing 30 kHz

Number of Channels 20 FA

Duplex Separation 45 MHz

In/Output Impedance 50 Ω

TX Intermediate Frequency 130.38 MHz

RX Intermediate Frequency 85.38 MHz

TX Local Frequency 1st (FTX + 130.38 MHz)

2nd (260.76 MHz)

RX Local Frequency 1st (FRX + 85.38 MHz)

2nd (170.76 MHz)

TCXO Frequency 19.68 MHz

Freq. Stability (FRX - 45 MHz) ± 150 Hz

Operating Temperature -30 °C ~ +60 °C

Supply Voltage + 3.8 V

2-2. TRANSMITTER

Waveform Quality 0.944 or more

Open Loop Power Control

-25 dBm -57.5 dBm ~ -38.5 dBm

-65 dBm -17.5 dBm ~ +1.5 dBm

-104 dBm +18.0 dBm ~ +30.0 dBm

Minimum TX Power Control Below -50 dBm

Closed Loop TX Power Control Range ± 24 dB

Maximum RF Output Power 200 mW (+24.5 dBm)

Occupied Band Width 1.32 MHz

Conducted Spurious Emission @900 kHz -42 dBc / 30 kHz

@1.25 MHz -54 dBc / 30 kHz

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1-3

SCH-A302 Specification

2-3. RECEIVER

Rx Sensitivity and Dynamic Range -104 dBm, FER=0.5 % or less

-25 dBm, FER=0.5 % or less

Conducted Spurious Emission

869 ~ 894 MHz < -81 dBm

824 ~ 849 MHz < -61 dBm

All other Frequencies < -47 dBm

Single Tone Desensitization

Rx Power level -101 dBm

Tone Power level -30 dBm Lower than 1 %

Tone Offset from Carrier ± 900 kHz

Intermoculation Spurious Response Attenuation

Tone 1 offset from carrier = ± 900 kHz

Tone 2 offset from carrier = ± 1,700 kHz

-Test 1, 2

Rx power = -101 dBm

Tone 1 power = -43 dBm

Tone 2 power = -43 dBm

-Test 3, 4 Lower than 1 %

Rx power = -90 dBm

Tone 1 power = -32 dBm

Tone 2 power = -32 dBm

-Test 5, 6

Rx power = -79 dBm

Tone 1 power = -21 dBm

Tone 2 power = -21 dBm

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2-1

2. SCH-A302 Trouble Shooting

1. Logic Section

1-1. No Power

U501 pin38 Input=HIGH Check Q507, Q509 and its

neighboring circuits

U501 pin6 & pin10

output=2.8 V?

Check U501 pin6 & pin10 and its

neighboring circuits

U501 pin39

Input=HIGH? Check R536 and its neighboring

circuits

END

Press PWR button

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2-2

SCH-A302 Trouble Shooting

1-2. Abnormal Initial Operation

TCXO CLK

applied to U609 pina17/U404

pin7?

Check VCTCXO output.

Replace if required.

TCXO CLK

signal outputted from OSC401

pin3?

Check OSC401 and its neighboring

circuits. Replace if required.

TCXO CL

signal outputted from OSC401

pin4?

Check OSC401 and its neighvoring

circuits. Replace if required.

TCXO CL

signal outputted from OSC402

pin4?

Check OSC402 and its neighvoring

circuits. Replace if required.

LED on? Check the LED and its neighboring

circuits. Replace if required.

Normal initial

display on LCD?

Check the LCD pins and its

neighboring circuits. Replace if

required.

Press PWR Key

END

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2-3

SCH-A302 Trouble Shooting

1-3. Abnormal Backlight Operation

‘L’ level outputted

from U501 pin1? Check U501 pin1 and its neighboring

circuits. Replace if required.

‘L’ level outputted

from U501 pin2?

Check U501 pin1 and its neighboring

circuits. Replace if required.

Press any button on the phone

Backlight LED on

1-4. Abnormal Key Data Input

Scanning signals

outputted from U609 pins C2,

A3, E4, D3, C1?

Check keypad dom switch.

Replace if required.

Check initial status

END

SAMSUNG Proprietary-Contents may change without notice

2-4

SCH-A302 Trouble Shooting

1-5. Abnormal Keytone

CLK wavefrom outputted

from U609 pin L16 & pin M17?

Check the U609 pin and its

neighboring circuits.

Replace if required.

CLK waveform outputted

from CON500 pin 5?

Resolder CON500 and its neighboring

circuits. Replace if required.

Key tone waveform

applied to C561? Check C631. Replace if required.

Normal Keytone? Replace the SPK assembly.

Abnormal Keytone

END

SAMSUNG Proprietary-Contents may change without notice

2-5

SCH-A302 Trouble Shooting

1-6. Abnormal Alert Tone

CLK waveform outputted

from U609 pin C14.

Check the U609 pin and its

neighboring circuits. Replace if

required.

CLK waveform applied to

Q511 Base?

Check R552, Q511 and its neighboring

circuits. Replace if required.

Is the buzzer connection

correct? Connect the buzzer correctly.

Abnormal Keytone

Check the buzzer and

replace if required.

2. Transmitter Section

Abormal transmitter section

Turn On Max PWR

Check U402 local level.

Check U204 TX RFT

out level OK?

Check U201 PWR AMP

out level OK?

-10~0 dBm

CDMA : 25~26 dBm

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