Samsung SCH-N500 User manual

CDMA TELEPHONE
CDMA TELEPHONE CONTENTS
SCH-N500
1. General Introduction
2. Specification
3. Installation
4. Product Support Tools
5. Circuit Description
6. Test Procedure
7. Flow Chart of Troubleshooting
8. Electrical Parts List
9. Exploded Views and Parts List
10. Block Diagram
11. PCB Diagrams

Samsung Electronics Co.,Ltd. Setember. 2005
Printed in Korea.
Code No.: GH68-08423A
BASIC.
This Service Manual is a property of Samsung Electronics Co.,Ltd.
Any unauthorized use of Manual can be punished under applicable
International and/or domestic law.
ⓒ

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1. General Introduction
1-1
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The SCH-N500 (Single Mode) phone functions as digital phone working in CDMA(Code Division Multiple
Access) mode.
The following standards and minimum performance standards shall be met or exceeded by each
subscriber unit.
Air Interface
The Subscriber Unit shall be Single band in compliance with TSB-74.
TIA/EIA IS-125 : Recommended Minimum Performance standards for Digital Cellular Wideband Spread
Spectrum Speech Service Option1.
TIA/EIA IS-126-A : Mobile Station Loop back Service Option standard.
TIA/EIA IS-95B : Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread
Spectrum Cellular Systems;for the analog air interface.
CDMA Receiver/Transmitter Specifications and Requirements
The Subscriber Unit shall meet TIA/EIA IS-98C. The Subscriber Unit shall comply with Personal Station
Class III.

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General Introduction
1-2
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2. Specification
2-1
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2-1 General
ITEM CDMA
Tx Freq. range
Rx Freq. range
Channel Bandwidth
Channel Spacing
Number of Channel
Duplex Separation
Type of Emission
In/Output Impedance
Tx Local Freq.
Rx Local Freq
TCXO freq.
Freq. Stability
Operating Temperature
824.64 ~ 848.87MHz
869.64 ~ 893.37MHz
1.23MHz
30KHz
20FA
45MHz
1M25F9W
50 Ohm
1649.28~1696.74MHz
1739.28~1786.74MHz
19.2MHz
(FRX-45MHz)+/-300Hz
-30deg ~ +60deg
Supply Voltage
Size and Weight
3.6V
STD : 57.0 X 37.0 X 5.1mm
20g 800 mAh

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Specification
2-2
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2-2 800MHz CDMA
GENERAL
Frequency Range
. Transmitter : 824.64 ~ 848.87MHz
. Receiver : 869.64 ~ 893.37MHz
Channel Bandwidth : 1.23MHz
Channel Spacing : 30kHz
Number of Channels : 20FA
Duplex Separation : 45 MHz
Type of Emission : 1M25F9W
Input/Output Impedance : 50 ohms
Local Frequency
. Transmitter : 1649.28~1696.74MHz
. Receiver : 1739.28~1786.7MHz
TCXO Frequency : 19.2MHz
Frequency Stability : (FRX-45MHz) ±300Hz
Operation Temperature : -30°C ~ +60°C
Supply Voltage : +3.6V
TRANSMITTER
Waveform Quality : 0.944 or more
Open Loop Power Control Range
. -25dBm : -57.5dBm ~ -38.5dBm
. -65dBm : -17.5dBm ~ +1.5dBm
. -93.5dBm : +10.5dBm ~ +29.5dBm

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Specification
2-3
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Minimum Tx Power Control : below -50dBm
Closed Loop Power Control Range : ±24dB
Maximum RF Output Power : 398mW(+24.5dBm)
Occupied Bandwidth : 1.23MHz
Conducted Spurious Emission @885 KHz : -42dBc/30kHz
@1.98 MHz : -54dBc/30kHz
RECEIVER
Rx Sensitivity and Dynamic Range : -104dBm, FER=0.5% or less
: -25dBm, FER=0.5% or less
Conducted Spurious Emission
. 869~894 MHz : <-81dBm
. 824~849 MHz : <-61dBm
All Other Frequencies : <-47dBm
Single Tone Desensitization : lower than 1 %
. Rx power level = -101dBm
. Tone power level = -30dBm
. Tone offset from carrier = ±900KHz
Intermodulation Spurious Response Attenuation : lower than 1 %
. Tone 1 offset from carrier = ±900KHz
. Tone 2 offset from carrier = ±1.700MHz
-Test1,2
Rx power = -101dBm
Tone 1 power = -43dBm
Tone 2 power = -43dBm
-Test3,4
Rx power = -90dBm
Tone 1 power = -32dBm
Tone 2 power = -32dBm
-Test5,6
Rx power = -79dBm
Tone 1 power = -21dBm
Tone 2 power = -21dBm

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Specification
2-4
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2-3 CDMA Debug Display Information
Toselectdebugdisplaymode:Select[Menu]+Press[5]+[*]+press[2]+[1]+[2]+[3]+[5]+[8]+
[0] + select [Debug Screen].
CDMA Monitor
Sxxxxx Nxxxxx SX
Pxxx RSSI-ECIO Wxx
CxxxxR-xx SI0 T-xx
②
⑤
⑧
①⑥ ③
④
⑦
⑩
⑨
①SID : SXXXX
②NID : NXXXX
③Call Processing State : SX
1) S1 : Init State
2) S2 : Idle State
3) S3 : VC Init State
4) S4 : WFO State
5) S5 : WFA State
6) S6 : Call State
7) S7 : Release State
8) S8 : OVHD State
9) S9 : Originate State
10) SA : Page Res State
11) SB : ORD Res State
12) SC : Reg State
13) SD : MSG State
⑪
④Pilot PN Code
⑤RSSI-ECIO
⑥-ECIO
⑦Walsh Code
⑧Channel Number
⑨Protocol Revision
⑩Slot Cycle Index
⑪ Call state : TX PDM Value
Idle, Sleep state :
Tx_Gain_ADJ Accumulator Value

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3. Installation
3-1
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Installing and Removing the Battery
To install, insert the battery into the opening on
the back of the phone making sure the plastic tabs
on the back are inserted into the matching slots in
the phone. Press down until the latchsnaps into
place.
To remove, make sure the power is off. Push the
battery release latch up completely. Pull and lift the
battery away from the phone.

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Installation
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3-2

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4. Product Support Tools
4-1
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4-1 General
IMPORTANT INFORMATION Purpose
The Product Support Tool (PST) offers you the ability to interface with the SAMSUNG telephone using a
PC. With this tool you can program the phones network system requirements and functionality, data, and
download software upgrades. This document supports UniPST version 2.686.
NOTE: This software supports only Windows 2000/XP.
EQUIPMENT REQUIRED
Make sure you have the following equipment setup:
1. Minimum PC configuration: 586 CPU, 64MB RAM, Windows2000/XP, 5MB of disk space free for
software upgrade.
2. PST Software with appropriate cable (UART Cable for SAMSUNG phone).
3. UART Port.
4. Power Supply (3.8 V) or Battery.
INSTALLATION
Software
1. Insert the SCH-N500 CD ROM into your CD-Rom drive.
2. Run the file explorer and run the Setup.exe file.
SAMSUNG Phone
Use the following procedure to connect the phone, cable, and PC .
Plug the female end of the DM Cable into the 16550 card.
Pull the black rubber connector away from the socket at the base of the phone.
Plug the special connector on the cable into the socket at the base of the phone.

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Product Support Tools
4-2
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4-2 PST (Product Support Tool)
4-2-1 Getting Started
MAIN MENU SCREEN
1. Double Click on your "Samsung PST for PBTL (SE)"
2. Select SCH-N500
The Main Menu Screen shows the basic tasks that are available.
CAUTION: DO NOT attempt to program phone with a low battery.
PST SETUP
UniPst supports SAMSUNG portable telephone. You can select UART port.
4-2-2 Operation Procedure
Service Programming
setting correct com port.
Read Data from File
Click "Open mmc" icon to select the name of a file whose extension is "mmc". The values will be read
from the named file, and will initialize the parameter values seen on the Service programming screen
Read Data from Phone
Click Read from the Phone icon to upload the current programmable parameters of the phone. The
values are read from the phone, so the phone must have the power ON and be properly connected
to the PST.
NOTE: To actually view the data you need to go to the Edit Items screens.
Edit Items
Click this icon to edit Number Assignment Module (NAM) items or UI items.
1. General : Slot Cycle Index, Service Code
2. NAM1
3. NAM2

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Product Support Tools
4-3
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Edit UI Items
1. System, Sound, And/Phone : Sound
Save Data to File
Click this icon to save the current parameters to a file. Once you enter a filename, Click <OK> button to
write all current parameters to that file. This way the same information can be downloaded into multiple
phones.
Write to Phone
Click this icon to write the selected parameter values to the phone. Writing the selected values to the
phone may take up to a minute. If there are dependencies in a field you can make all the changes in
the proper fields and download the information all together.
If you intend to use this write to Phone feature, it is recommended that you do a "Read Data from
Phone" first, and then make the changes, so that nothing gets inadvertently overwritten.
NOTE: DO NOT TOUCH THE PHONE WHILE WRITING IS IN PROGRESS.
Software Download and Upgrade Screen
1. Connect PC and SCH-N500 with UART cable
2. Run Universal PST.
3. Select DownLoad Mode tab.
4. Click Bin icon to load Image file.
5. When the downloading process is finished, the PST shows "Downloading completed!!" and the
SCH-N500 reboots automatically.
NOTE: DO NOT POWER OFF WHILE THE PHONE IS BEING DOWNLOADED!

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Product Support Tools
4-4
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5. Circuit Description
5-1
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5-1 Logic Part
5-1-1 Power Supply
Press "END/ⓛ" key to turn on the phone and then
the V_BAT signal will be connected to ON_SW,
which turns on the inner regulator (MSMA_2.65V,
MSMP_2.85V) of U204 (RC5T623)
The V_BAT applied to ON_SW will change
ON_SW_SENSE signal from HIGH to LOW. This
will allow MSM6000 (U100) to send out PS_HOLD
(logical HIGH) to turn on the inner regulator even
after the END/ⓛkey is released.
The regulated voltage (MSMP_2.85V) is used in
the digital part of MSM6000, Memory, and LCD.
The regulated voltage (MSMA_2.65V) is used in
analog part and MSMC_2.80V used in core part of
MSM6000. The regulated voltage (RFTX_2.60V) is
used in the TX RF part. The regulated voltage
(RFRX_2.60V) is used in the Rx RF part. The
regulated voltage (MOTOR_3.0V) is used in motor
part. The regulated voltage (PAVREF_2.90V) is
used in WS1101 (U447). The regulated voltage
(U209) LED_3.3V is used in LED.
5-1-2 Logic
The logic part consists of the internal CPU
(MSM6000) and the extra memory composed of
SRAM and FlashROM. The MSM6000 receives
32.768KHz TCXO clock signal and controls the
phone as a whole. The major components are as
follows:
- CPU : ARM7TDMI CPU core,
- FROM:U102(K5A3281CTM) 32Mbit Flash ROM,
MCP.
- SRAM:U102(K5A3281CTM) 8Mbit SRAM, MCP.
CPU(U100:MSM6000-208FBGA)
ARM 7TDMI microprocessor is used for the main
processing. The CPU controls all the circuitry. The
MSM6000 derives all of its internal clock sources
from two clock inputs, TCXO (19.20MHz) and
XTAL (32.768KHz). The clock of 32.768KHz is
used for sleep. This is equipped with the ARM
7TDMI CPU core, CDMA, DFM block, vocoder,
general purpose interface, and other interfaces, and
is one of the most important components of the
CDMA cellular phone.
FROM and SRAM (U102:K5A3281CTM,MCP)
Memories are composed of 32Mbit FROM and
8Mbit SRAM. 32Mbit Flash ROM is used to store
the FONT data and terminal's program. Using
the down-loading program, the program can be
changed even after the terminal is fully assembled.
8MbitSRAMisusedtostoretheinternalflag
information, call processing data, and timer data.
KEYPAD
For key recognition, key matrix is setup using
SCAN(0:6) and KEYSENSE(0:2) of input port of
MSM6000. 12 backlight LEDs and back-light
circuitry are included in the keypad for easy
operation in the dark.
LCD MODULE
TheLCDmoduleisa128X64dotsand1fixed
icon. The LCD contains a controller which will
display the information by 8-bit data from the MCU.
It also contains a DC-DC converter for contrast
adjustment and LCD reflector to improve the
display efficiency. An internal back-light circuitry
and EL back-light are used for easy operation in
the dark.

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Circuit Description
5-2
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5-1-3 Baseband
MOBILE SYSTEM MODEM (MSM6000)
The MCU equipped with the ARM 7TDMI CPU
core is an important component of the CDMA
cellular phone. The MSM6000 comes in a 208-Ball
FBGA Package.
MICROPROCESSOR INTERFACE
The interface circuitry consists of reset circuit,
address bus(A0-A22),data bus(D0-D15),and memory
controls (LB, UB, WE, OE, CS|1S, CE|F, CS2S,
RY|BY)
CODEC
The MSM6000 (U100) integrates an audio voice
band CODEC into the Mobile Station Modem. The
integrated CODEC contains all of the required
conversion and amplification stages for the audio
front end.
Clock
-Modem clock : 19.20MHz. This clock signal is
used for ARM 7TDMI
-Sleep clock : 32.768KHz. This clock signal is used
for sleep.
RFT6122, RFR6122 AND MSM INTERFACE
A. CDMA Data Interface
- TX_IP, TX_IM, TX_QP, TX_QM (U400 pins 29,
30 / 27, 28): Differential analog input for I and Q
component used during CDMA mode.
-RX_IP, RX_IM, RX_QP, RX_QM (U300 pins 28,
27 / 25, 26): RX analog baseband output for I and
Q component used during CDMA mode
B. RF Interface
- TX : TX_AGC_ADJ (U400 pin 21) port is used to
control the TX power, TX_ON (U100 pin B12)
signal used to control RFT6122
- RX : SBI_DT, SBI_CK_SBI_ST (U300 pins 3, 4,
5) lines are used to control the RX gain and
TRK_LO_ADJ (U100 pin D15) is used to
compensate the TCXO clock.

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Circuit Description
5-3
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5-1-4 Audio Part
The MSM6000 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 IS-127 EVRC. The
EVRC 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
(U100)'s internal.
RX AUDIO PATH
The PCM data from the MSM (U100)'s internal is
inputtedtotheinternalCODECandthedatawill
be decoded by the internal DAC and audio levels
are adjusted by the amplifier. The final audio is
then sent to the audio receiver.
ALERT TONE AND MELODY DRIVING
CIRCUITRY
A speaker generates alert tone and melody. When
the MSM (U100) receives the data, it generates
alert tone and melody. Ringer signal generated in
MSM6000isintendedtodriveaspeaker.
KEYTONEGENERATOR
The CODEC data out from the MSM6000 is
converted to DTMF signal by TONE generator of
internal CODEC, is then amplified by the internal
audioamplifiertobesenttothespeakerunit.

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Circuit Description
5-4
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5-2 RF Part
5-2-1 Transmitter (For CDMA (800MHz))
ANTENNA
Antenna sends the signal to the base station and
receives the signal from the base station.
DUPLEXER
The duplexer (F401) passes RF signal with the
frequency of 836.49 ± 12.5 MHz through power
amp output to antenna, and receives RF signal
with the frequency of 881.49 ± 12.5 MHz from
antenna to LNA input.
POWER AMP
The power amplifier module (PAM, U447) amplifies
the power of the RF signal sent to the base
station through the antenna.
RF Band Pass Filter (Tx RF SAW Filter)
The RF BPF (F400) pass only specific frequency
(836.49 ± 12.5MHz) signal. This filter eliminates the
image products generated by the up-converter.
TX Automatic Gain Control Amp
The TX AGC amp within RFT6122 controls its gain
by adjusting the control voltage in order to deliver
the suitable power needed at the input stage of
Driver amp. Dynamic range is 90dB, and its control
voltage varies from 0.2V to 2.5V.
5-2-2 Receiver (For CDMA (800MHz))
LOW NOISE AMPLIFIER (LNA)
The low noise amplifier included in RFR6122
amplifies a weak signal received from the base
station to obtain the optimum signal level.
RF BAND PASS FILTER (RX RF SAW
FILTER)
The RF BPF (F300) passes only specific frequency
(881.49±12.5 MHz) signal.
RX Automatic Gain Controller (AGC) AMP
RX AGC amplifier within RFR6122 keeps its output
power at a constant level by controlling the gain
within the dynamic range of 90dB, maximum gain
45dB and minimum gain -45dB.
5-2-3 PLL Block
FREQUENCY SYNTHESIZER CIRCUIT
While both RX PLL block and TX PLL block are
embedded in RFT6122, only the RX VCO block is
embedded in RFR6122. The input reference
frequency is generated from VC-TCXO (OSC301),
and the RF local signal from VCO. PLL compares
the reference with the VCO output divided by
multiples preprogrammed in counters through SBI
interface, and, if the difference is found, adjusts
the DC voltage which controls the frequency of
VCO output signal.

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Circuit Description
5-5
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VC-TCXO
The VC-TCXO (OSC301) is used as a reference
source of the frequency synthesizer. It generates
19.20MHz reference frequency. It is a voltage-
controlled temperature-compensated crystal
oscillator with the frequency stability of 19.20MHz ±
2.0ppm over all useful temperature range. The
frequency is controlled by the voltage from the
MSM6000 considering the ambient temperature.
TEMPERATURE-TO-VOLTAGE CONVERTOR
The temperature-to-voltage convertor (TH101)
detects the peripheral temperature. It is used to
compensate the variance in characteristics of an
active component due to the temperature difference.

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Circuit Description
5-6
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5-3 Test Command Table
To change the phone from normal mode to test mode, you should enter the following keys. :
Press[47*68#13580]
Command No Command SW Name Description
1 T_SUSPEND_I /* Enter to test menu */
2 T_RESTART_I /* Escape from test menu */
7 T_CARRIERON_I /* Turn on the carrier */
8 T_CARRIEROFF_I /* Turn off the carrier */
9 T_LOADSYN_I /* Load the synthesizer for locking */
14 T_CDATA_I /* Continuously send TX control data */
15 T_CDTRK_ADJ_I /* CDMA TRK local adjust */
16 T_CDMA_TXADJ_I /* Sets tx_agc_adj for cdma mode */
21 T_TEST_SYS_I /* Set TEST_SYS */
22 T_SNDNAM_I /* Send NAM information */
23 T_SNDVERSION_I /* Send software version */
24 T_SNDESN_I /* Send ESN */
39 T_BACKLIGHT_ON_I /* Backlight on */
40 T_BACKLIGHT_OFF_I /* Backlight off */
41 T_LAMP_ON_I /* Lamp on */
42 T_LAMP_OFF_I /* Lamp off */
43 T_LCD_CONTRAST_I /* LCD contrast adjust */
45 T_VIBRATOR_ON_I /* Activate a vibrator */
46 T_VIBRATOR_OFF_I /* Inactivate a vibrator */
47 T_DTMFON_I /* Turn on DTMF */
48 T_DTMFOFF_I /* Turn off DTMF */
51 T_BATT_TYPE_I /* Battery type */
52 T_READ_BATT_I /* Saved low battery value read */
53 T_VBATT1_I /* Set the low battey position in the standby
*/
54 T_VBATT2_I /* Set the low battey position in the talking */
55 T_WRITE_BATT_I /* Write a BATT */
56 T_THERM_READ_I /* Read a Thermister */
58 T_CLR_LIFETIME_I /* Clear Life Time */
59 T_CARRIER_I /* Carrier selection */
60 T_CLEAR_ALL_I /* Clear all */
72 T_HIGH_TXRAS_ADJ_I /* High gain TX pwr RAS adjust */
73 T_TXRAS_ADJ_I /* Low gain TX pwr RAS adjust */
74 T_CH_FLATNESS_I /* CDMA TX pwr ch. flatness */
76 T_CDMA_PWR_LIMIT_I /* CDMA TX pwr limit */
79 T_CDMA_TEMPCOMP_I /* CDMA temp. compensation */
121 T_CDMA_VGA_OFFSET_I /* CDMA DVGA offset */
127 T_CDMA_BTF_I