Text preview for : Samsung SCH-i830 service manual.pdf part of Samsung SCH-i830 service manual Samsung GSM Samsung SCH-i830 service manual.pdf



Back to : Samsung SCH-i830 service | Home

CDMA TELEPHONE
SCH-i830




CDMA TELEPHONE CONTENTS

1. General Introduction

2. Circuit Description

3. Installation

4. NAM Programming

5. Product Support Tools

6. Test Procedure

7. Flow Chart of Troubleshooting

8. Exploded View/

Disassembly and Assembly Instructions

9. Block Diagram

10. Electrical Parts List

11. PCB Diagrams
Samsung Electronics Co.,Ltd. August. 2006
Printed in Korea.
This Service Manual is a property of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable Code No.: GH68-12640A
International and/or domestic law.
BASIC.
1. General Introduction

1-1 General Instruction

The SCH-i830 enable mobile users to communicate 3G CDMA2000 1X, 1X EVDO 2G GSM service into
a single handset.
For CDMA/PCS mode, The SCH-i830 supports Release A of the CDMA2000 1X standard, offering data
rates of up to 307 kilobits per second (kbps) on both the forward and reverse links, along with
simultaneous voice and data services.
For The GSM/DCS/GPRS mode, The SCH-i830 supports voice service, data service and SMS in
EGSM900 and DCS1800.
So, The SCH-i830 may be the first PDA phone in the world that works on North American CDMA
networks and also GSM networks overseas. This stylish bar phone also supports a VGA color displays,
Bluetooth, SMS, Email, voice dialing, and airplane mode.




1-1
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
General Introduction




1-2

SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
2. Circuit Description

2-1. Logic Section

2-1-1. Power Supply

For the POWER ON, the PHONE_ON pulse signal for 1 second from PDA turns on U900 (PM6650)
The pin 29, 33, 35, 41, 52, 54, 65, 71, 83 of U900(PM6650) are the inputs of all r egulators on the
phone. Simultaneously, MSM sends out PS_HOLD(logical HIGH) to turn on the p in 57 of
U900(PM6650) even after the PHONE_ON signal is released. For the POWER OFF, by pressing
POWER KEY of the phone application, the MSM output LOW on the PS_HOLD.
The regulated voltage(U900,VREG_MSMC, VRGE_MSME, VREG_MSMP ) is used in the digital part
of MSM
The regulated voltage(U900,VREG_MSMA) is used in the analog part of MSM.
The regulated volgtage(U900, VREG_RFTX) is used in the TX RF
The regulated voltage(U900,VREG_RFRX) is used in the Rx RF part.
The regulated voltage(U900,VREG_TCXO) is used in the TCXO
The regulated Voltage(U900,VREG_SYNTH) is used in the PLL part.


2-1-2. Logic Part

The logic part consists of internal CPU of MSM, Memory.


MOBILE SYSTEM MODEM(UCP800:MSM6500)


Industry standard ARM926EJ-S microprocessor is embedded. The MSM6500 chipset integrates
CDMA2000 1x and 1xEVDO service. The 1xEVDO solution can support High-speed peak data rates of
2.4Mbps on forward link and 153kbps on reverse link.
The MSM6500 device is offered in a 409 ball, 0.5mm pitch, CSP production package. Subsystems within
the MSM6500 device include a CDMA processor, a QDSP for voice compression, an ARM9TDMI
microprocessor. Also integrated in the MSM6500 device are analog functions such as an audio voice
codec, PLL, transmit DACS, ADCS, memories, USB controller, peripheral interfaces, and an enhanced
clock. It is one of the most important components of the CDMA cellular phone.
The interface circuitry consists of reset circuit, dual address/data bus and memory controls. The TCXO
clock of 19.2Mhz is used as the clock of SCH-i830 model.


MCP : FLASH ROM and SDRAM (UME802:K5D5657DCM)


MCP is consist of 256Mbit NAND FALSH and 256Mbit SDRAM. MCP is used to store the cellular
phone's executable program ,necessary data files and temporary data space and efs area is used to
store ESN, NAM information, telephone directory, SMS messages and other important information of the
phone. MCP is also used to execute the DMSS(Dual Mode Subscriber system) software.
2-1
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used with out Samsung's authorization
Circuit Description




Clock
CPU clock : 19.2MHz. This clock signal from the TCXO
Sleep clock : 32.768KHz. This clock signal is used for sleep.
TCXO/N : 19.2/N MHz. This clock source is used by various blocks of the MSM6500
device, such as the ARM9CORE, UARTs, general-purpose PDMs and
TCXO is also used by the MSM6500 device to produce CHIPX8.
USB clock : 48MHz. This clock signal is used to drive the USB interface




2-1-3. RF Interface Part

CDMA Data Interface
- TX_Q_P, TX_Q_N, TX_I_P, TX_I_N (UCP800) : Tx analog signal used during CDMA
- RX_I_P, RX_Q_P, RX_I_N, RX_Q_N (UCP800): RX analog signal used during CDMA


RF Interface
- TX : TX_AGC_ADJ(UCP100) is used to control the TX power,
PA_ON_PCS(UCP100) is used to control the PCS power amplifier and
PA_ON_CELL(UCP100) is used to control the CDMA power amplifier.
- RX : TRK_LO_ADJ(UCP100) is used to compensate the TCXO module.




2-1-4. Audio Part

The MSM6500 integrates an audio voiceband Codec into Mobile Station Modem.
The integrated Codec contains all of the required conversion and amplification stages for the
audio front end.


The Codec operates as a 13bit linear Codec with the transmit(TX) and
receive(RX) filters designed to meet ITU-TG.712 requirement. The CODEC contains the
software controller amplifier for both the receiving and transmitting sections. Also, the
vocoding schemes used will be 13kbps QCELP and 8Kbps EVRC. The QCELP vocoder is
based in the MSM internally.




Tx Audio Path

The voice signal from the microphone is inputted to the internal CODEC. The voice signal is then
amplified by the internal amplifier and is converted to PCM data to be outputted to the MSM as 13bit
data. This data is then processed by the MSM(UCP800)'s internal.
2-2

SAMSUNG Proprietary-Contents may change without notice
This Document can not be used with out Samsung's authorization
Circuit Description




Rx Audio Path

The PCM data from the MSM(UCP800)'s internal is inputted to the internal CODEC and the data will be
decoded by the internal DAC and audio levels are adjusted by the amplifier. The final audio is then sent
to the audio receiver.


2-2. PCS Section

2-2-1. Receiver

LOW NOISE AMPLIFIER (U1000)


The low noise amplifier(It is included in FC7510:U1000) amplifies a weak signal received from
the base station to obtain the optimum signal level.


RF BAND PASS FILTER (F1001)


The RF BPF(F1001) passes only a specific frequency(1960