VOXTEL VS400 Service Manual

Service Manual Rev. 1.0

Product: VS400

Service Level: Level 1 ~Level 4

Version: 1v0

Author: Customer Service Department

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			Service Manual Rev. 1.0
1	DOCUMENTATION SCOPE		4
1.1		BRIEF OF VS400	4
1.2		SPECIFICATIONS	4
1.3		BASIC SERVICE	6
1.4		SUPPLEMENTAL SERVICE	6
2	OVERVIEW OF GSM OPERATION		8
2.1		CELLULAR PHONE CONCEPT	8
2.2		GSM-GLOBAL SYSTEM FOR MOBILE COMMUNICATIONS	8
2.3		GSM SYSTEM	9
2.4		SERVICE AREA	11
3	VS400 HARDWARE SPECIFICATIONS		12
3.1		RF SUBSYSTEM	12
3.2		BASE-BAND SUBSYSTEM	14
3.3		BASE-BAND PARTS DETAILS	15
3.4		ACOUSTIC SPECIFICATIONS	27
3.5		CE MARKING	27
3.6		RELATED PERFORMANCE	29
4	CIRCUIT SCHEMATICS		30
4.1		MEMORY CIRCUIT	30
4.2		SIM CARD CIRCUIT	31
4.3		AUDIO CIRCUIT	31
4.4		KEY PAD CIRCUIT	32
4.5		LED CIRCUIT	33
4.6		VIBRATOR CIRCUIT	34
4.7		CHARGER CIRCUIT	34
4.8		LCM CIRCUIT	35
4.9		CAMERA MODULE CIRCUIT	35
4.10 EARPHONE JACK CIRCUIT			36
4.11		FM RADIO CIRCUIT	36
4.12 IRDA REMOTE CONTROL CIRCUIT			37
4.13		MAIN BOARD B2B CONNECTOR CIRCUIT	37
4.14		UPPER BOARD B2B CONNECTOR CIRCUIT	38
4.15		HALL SENSOR CIRCUIT	38
4.16		MINI USB CIRCUIT	38
4.17		RECEIVER CIRCUIT	39

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				Service Manual Rev. 1.0
4.18			TRANSCEIVER CIRCUIT	39
5	SOFTWARE DOWNLOAD			40
5.1		SYSTEM REQUIREMENTS		40
5.2		INSERTION OF THE USB2COM DOWNLOAD CABLE		40
5.3		INSTALLATION OF D/L TOOL		40
6	DISASSEMBLY/ASSEMBLY PROCEDURE			42
6.1		INTRODUCTION		42
6.2		RECOMMENDED TOOLS		42
6.3		DISASSEMBLY PROCEDURE		42
6.4		ASSEMBLY PROCEDURE		52
7	TROUBLE SHOOTINGS			53
7.1		GENERAL BUG LIST		53
7.2		TROUBLE SHOOTING –RF		54
7.2.1			TRANSMITTER	55
7.2.1.1			TRANSCEIVER	55
7.2.1.2			POWER AMPLIFIER	58
7.2.1.3			ANTENNA SWITCH	60
7.2.2			RECEIVER	61
7.2.3			VCTCXO	65
7.2.4			TRANSCEIVER	66
7.3		TROUBLE SHOOTING -BASEBAND		69
7.3.1			MAIN AND UPPER PCB	71
7.3.2			TEST POINTS	72
7.3.3			GPIOS LIST	72
7.3.4 VOLTAGE FOR SPECIFIC FEATURES				74
7.3.5			REGULATOR CONTROL	74
7.3.6			CLOCK WAVEFORMS	74
8	FREQUENT ASK QUESTIONS			78
8.1		GENERAL QUESTIONS		78
8.2		ADVANCED QUESTIONS		81
9	APPENDIX			83

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1 Documentation Scope

This documentation describes the functions and details of VOXTEL’s VS400 – A quad-band GSM850/GSM900/DCS1800/PCS1900 GSM feature phone with GPRS class-10 function. The maintenance procedure and trouble-shootings are included as well.

1.1Brief of VS400

VS400 is a feature phone with camera targeting on the young generation market i.e., teenagers, students and females. VS400 integrates a CSTN-LCD display (1.5” / 128*128 / 65k colors), a VGA camera (30M pixel CMOS camera with flash), 40 polyphonic ring-tones, MP3 player and FM radio. The GPRS function plus WAP2.0 /OMA DRM/SMS/EMS/MMS1.1 allows users to surf the Internet on the move.

1.2 Specifications

Key Features List	VS400
Supported Bands	850/900/1800/1900
GSM Phase	2+ Compliant
GPRS Class	12 Compliant
Circuit Switch Data	CSD up to 14.4 kbps
Supported Voice Codec	FR/EFR/HR/AMR
Main LCD Display	1.5” 128×128 65K Color STN
Antenna Type	Embedded
Charger Type	Switch
Loud speaker / hands free	Yes
Stereo headset	Yes
Polyphonic (chords)	S/W Polyphonic 40 chords
WAP	WAP 2.0
MMS	Yes
EMS R4	Yes

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Concatenated SMS	Yes
Intelligent Text input	T9
FM Radio	Yes
MP3	Yes
Games	WGE games
JPEG	Yes
Secured Digital (SD) card interface	Yes
IrDA interface	Yes
USB Connection	USB 1.1
Wallpapers	Yes
Melody Composer	Yes
ME Address book	250
Caller Photo Display	Yes
Caller Groups	Yes
Calendar/Note/Appointment	Yes
Alarm Clock	Yes
Calculator	Yes

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1.3Basic Service

Tele Service

Telephony (Speech)

Emergency Call

Short Message Service

Delivery Report

Short Message Service MT/MO

Cell Broadcast

Bearer Service

Data circuit duplex asynchronous up to 9600 bit/sec

1.4Supplemental Service

Number identification (CLI)

Calling line identification presentation(CLIP)

Calling line identification restriction (CLIR)

Connected line identification presentation (CoLP)

Connected line identification restriction (CoLR)

Call completion

Call waiting (CW)

Call hold (HOLD)

Call barring

Barring of all outgoing calls (BAOC)

Barring of outgoing international calls (BOIC)

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Barring of outgoing international calls (BOIC-exHC)

Barring of all incoming calls (BAIC)

Barring of incoming calls when roaming (BIC-Roam)

Call forwarding (Call Divert)

Call forwarding unconditional (CFU)

	Call forwarding on mobile subscriber busy (CFB)
	Call forwarding on no reply (CFNRy)
	Call forwarding on mobile subscriber not reachable (CFNRc)
Multi Party	(MPTY)
Charging
	Advice of charge-information (AoCI)

Advice of charge-charging (AoCC)

Unstructured supplementary service Data (USSD)

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2 Overview of GSM Operation

2.1Cellular Phone Concept

The cellular system was first used to provide radiotelephone service in the frequency range 890-960 MHz. A cellular system provides higher call handling capacity and system availability than would be possible with conventional radiotelephone systems (those which require total system area coverage on every operating channel) by dividing the system coverage area into several adjoining sub-areas or cells.

Each cell contains a base station (cell site) that provides transmitting and receiving facilities, for an allocated set of duplex frequency pairs (channels). Since each cell is a relatively small area, both the cell site and the radiotelephone that it supports can operate at lower power levels than would be used in conventional systems.

Using this technique, radiation on a given channel is virtually contained in the cell operating on that channel and, to some extent, those cells directly adjacent to that cell.

Since the coverage area of a cell on a given channel is limited to a small area (relative to the total system coverage area), a channel may be reused in another cell outside the coverage area of the first. By this means, several subscribers may operate within the same geographic area, without interference with each other, on a single channel.

2.2GSM-Global System for Mobile communications

Unlike former cellular systems, GSM uses digital radio techniques. The GSM system has the following advantages over previous analogue systems:

International Roaming - Due to international harmonization and standardization, it will be possible to make and receive calls in any country, which supports a GSM system.

Digital Air Interface - The GSM phone will provide an entirely digital link between the telephone and the base station, which is, in turn, digitally linked into the switching subsystems and on into the PSTN.

ISDN Compatibility - ISDN is a digital communications standard that many countries are committed to implementing. It is designed to carry digital voice and data over existing copper telephone cables. The GSM phone will be able to offer similar features to the ISDN telephone.

Security and Confidentiality – Telephone calls on analogue systems can very easily be overheard by the use of a suitable radio receiver. GSM offers vastly improved

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confidentiality because of the way in which data is digitally encrypted and transmitted.

Better Call Quality - Co-channel interference, handover breaks, and fading will be dealt with more effectively in the digital system. The call quality is also enhanced by error correction, which reconstructs lost information.

Efficiency - The GSM system will be able to use spectral resources in a much more efficient way than previous analogue.

2.3GSM System

In the figure below, the area bounded by bold lines represents the total coverage area of a hypothetical system. This area is divided into several cells, each containing a cell site (base station) operating on a given set of channels which interfaces radiotelephone subscribers to the telephone switching system.

The radiotelephones themselves are capable of operation on any channel in the system, allowing them to operate in any cell. Due to the low power requirements for communications between radiotelephones in a particular cell and the cell site, operating channels may be repeated in cells that are outside the coverage area of each other.

For example, presume that cell A operates on channels arbitrarily numbered 1 through 8, cell B operates on channels 9 through 16, cell C operates on channels 17 through 24 and cell D operates on channels 1 through 8 (repeating the usage of those channels used by cell A). In this system, subscribers in cell A and subscribers in cell D could simultaneously operate on channels 1 through 8.

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The implementation of frequency re-use increases the call handling capability of the system without increasing the number of available channels. When re-using identical frequencies in a small area, co-channel interference can be a problem. The GSM system can tolerate higher levels of co-channel interference than analogue systems, by incorporating digital modulation, forward error correction and equalization. This means that cells using identical frequencies can be physically closer, than similar cells in analogue systems. Therefore the advantage of frequency re-use can be further enhanced in a GSM system, allowing greater traffic handling in high use areas.

By incorporating Time Division Multiple Access (TDMA) several calls can share the same carrier. The carrier is divided into a continuous stream of TDMA frames, each frame is split into eight time slots. When a connection is required the system allocates the subscriber a dedicated time slot within each TDMA frame. User data (speech/data) for transmission is digitized and sectioned into blocks. The user data blocks are sent as information bursts in the allocated time slot of each TDMA frame.

The data blocks are modulated onto the carrier using Gaussian Minimum Shift Keying (GMSK), a very efficient method of phase modulation.

Each time an information burst is transmitted, it may be transmitted on a different frequency. This process is known as frequency hopping. Frequency hopping reduces the effects of fading, and enhances the security and confidentiality of the link. A GSM radiotelephone is only required to transmit for one burst in each frame, and not continually, thus enabling the unit to be more power efficient.

Each radiotelephone must be able to move from one cell to another, with minimal inconvenience to the user. The mobile itself carries out signal strength measurements on adjacent cells, and the quality of the traffic channel is measured by both the mobile and the base station. The handover criteria can thus be much more accurately determined, and the handover made before the channel quality deteriorates to the point that the subscriber notices.

When a radiotelephone is well within a cell, the signal strength measured will be high. As the radiotelephone moves towards the edge of the cell, the signal strength and quality measurement decreases.

Signal information provides an indication of the subscriber’s distance from the base station. As the radiotelephone moves from cell to cell, its control is handed from one base station to another in the new cell.

This change is handled by the radiotelephone and base stations, and is completely transparent to the user.

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2.4Service Area

A service area, where phone calls can be originated and received, is defined by the system operators. (Because this is a radio system, there is no exact boundary that can be drawn on a map.) If the telephone is outside a coverage area, the (no service) indicator will illuminate and calls will be unable to be placed or received. If this happens during a conversation, the call will be lost. There may also be small areas within a particular service area where communications may be lost.

The radiotelephone’s identity information is held by its local GSM system in its Home Location Register (HLR) and Visitor Location Register (VLR). The VLR contains identity information on all local active radiotelephones. Should you roam to another area, system or country the radiotelephones identity information is sent to the VLR in the new system. The new system will then check the radiotelephones details with your home system for authenticity. If everything is in order, it will be possible to initiate and receive calls within the new cell.

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3 VS400 Hardware Specifications

3.1RF Subsystem

VS400 supports GSM850/EGSM/DCS/PCS quad-band as well as GPRS function. It supports GPRS class 10, i.e. the maximum uplink slot number is 2; the maximum downlink slot number is 4.

The key components chosen for accomplishing the above requirements are listed below:

Power amplifier --- SKY77325 (SKYWORKS), which is capable of supporting GPRS class12 and quad-band application.

Transceiver IC --- AD6539 (ADI), which is GSM850/EGSM/DCS/PCS quad-band design with GPRS class-12 capability.

Antenna switch --- C085TK (Hitachi metals), which is as the duplexer between transmission / reception route for EGSM/DCS/PCS bands.

RF Clock --- 26MHz VC-TCXO, which is the fundamental reference frequency for transceiver PLL synthesizer and the fundamental frequency of base band chipset after divided by two.

RF switch (850 and 900MHz)---TG2211FT (Toshiba)

The block diagram of RF section is as below:

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RF Block Diagram

AD6539

TG2211FT

			SAW
	RF
	SWITCH
	850/900		SAW
			SAW
			SAW

26MHz

13MHz

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3.2Base-band Subsystem

VS400 integrates ADI AD20msp430 SoftFone GSM/GPRS BB chipset including AD6528D, AD6535. It supports radio interface for GSM850, GSM900, DCS1800 and PCS1900. For data service, it supports 14.4Kbits/sec GPRS and HSCDS. For voice service, it supports full-rate, half-rate and enhanced full-rate. It also supports data encryption algorithm for GSM network operation including A5/1 and A5/2 algorithms. The following diagram shows the base-band circuit block.

KEYPAD		KeypadCOL
Matrix				Voltag
		KeypadROL
				e
				Regul
MCP Flash		ADD[22:1]		ators
128M+32M		DATA[15:0]	Audio	Audio
AMD
			Data	Data
			port	port
CMOS
Tran			BASE	BASE
Chips		cs
TC5747			BAND	BAND
			I/Q	I/Q
			Serial	Serial
			port	port
Data[15:
Display			Control	Control
Powertip
LCM			Serial	Serial
Boost	IC		port	port
		GPIO
MP1518
			ABB_I	IN
Universal			NT
				T
System			CLKO	MCLK
Connector
(USC)		USC[6:0]	UT	EN
			ABBRES	RES
			ET	ET
		32KH		VCXOE
				N

Battery
Charger
LIGHT	LED
SPEAK
Receiver
	Headhones
	Or Headset

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3.3Base-band Parts Details

AD6528D

AD6535

The AD6528D is the digital baseband processing solution offered by ADI as part of the AD20msp430 SoftFone® chipset Family. The chip integrates a powerful DSP, ARM7TDMI processor, and extensive set of peripherals that support applications such as MMS, EMS and MP3. The AD6528D allow advanced speech algorithms, such as AMR and signal processing function such as echo cancellation and noise reduction. The AD6528D supports pseudo-static RAM, page and burst flash memories, USB, SD/MMC and devices such as camera modules. It can be divided into three main subsystems.

Control processor subsystem.

DSP subsystem.

Peripheral subsystem.

The AD6535 is the analog baseband and power manager processor. It provides voice band and base band codec converters that combine all A/D and D/A function for GSM terminal and power manager include charger function. The AD6535 can be divided into several parts.

Base-band Transmit Section

GMSK Modulator

I-channel & Q-channel Transmitter DACs and Filters

Power Ramping DAC

Base-band Receive Section

I-channel and Q-channel Receiver ADCs and Filters

Auxiliary Section

Voltage Reference

Automatic Frequency Control DAC

Auxiliary ADC

Light Controllers

Audio Section

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Microphone

Loud Speaker

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8 kHz & 16 kHz acoustic freq. Codec

48 kHz Monophonic DAC

Power Management Section

Voltage Regulators

Battery Charger

Battery Protection

Digital Processor Interface

Control, Base-band, and Audio Serial Ports

Interrupt Logic

Panasonic WM-64GRY102

Sensitivity -42±2 dB at 1kHz, 1V/Pa

Impedance max 2.2k ohm, at 1kHz,

S/N Ratio (A curve) min 58 dB, at 1kHz,

Dimension φ 6.0 * 2.2 mm

Directional characteristic omni-directional

Operating voltage DC 2V

Keyrin 2014-8D-03P

Impedance 8 ± 1.2 ohm at 1Vrms, 1KHz.

SPL 88dB(0.1W/0.1m) ± 3dB at 0.8kHz, 1.0, 1.2, 1.5kHz average. Lowest Resonance Frequency (Fo)

800Hz ± 160Hz at 1Vrms

Rated Input (Nom./Max.): 0.5W/1.0W

Frequency Range Fo – 20kHz

Dimension 20mm x 14 mm x 3.5mm (T)

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Receiver

Stacked-MCP

Architecture (128Mbit Flash + 64 M bit PSRAM)

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Operating temperature -20 °C ~ +70 °C

Storage temperature -40°C ~ +85 °C

Philips 2403 252 28908

Rate impedance 32 ohm

Sensitivity average SPL 400-2000Hz at 179mV 110 ± 2 dB

RLR: -16± 2 dB

Dimension φ 8.1mm

Spansion S71PL129JC0

Stacked Multi-Chip Product (MCP) Flash Memory and PSRAM

128 Megabit (8M x 16-bit) CMOS 3.0 voltage-only simultaneous operation, Page mode flash memory with 64Mbit (4M x 16-bit) pseudo-static RAM. Power supply voltage of 2.7 to 3.1 Volt

Access time: 65ns flash and 70ns PSRAM

Operating temperature: -25‌to +85 (wireless)

-40 to +85 (Industrial) Both top and bottom boot blocks in one device.

MCP BLOCK DIAGRAM

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Display	VS400 integrates PowerTip LCM, its specification is as followed.
	ITEM	STANDARD	DOTS
		VALUE
	NUMBER OF	128 x (R,G,B) ×	mm
	DOTS	128
	MODULE	36.1 (W) × 54.55	mm
	DIMENSION	(H) × 4.05 (T)
	EFFECTIVE	29.5 (W) × 29.2	mm
	DISPLAY	(H)

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CMOS

Sensor

Service Manual Rev. 1.0

AREA
DOT SIZE	0.055	(W)	×		mm
	0.195 (H)
DOT PITCH	0.070	(W)	×		mm
	0.210 (H)
APPROX.	6.5				gram
WEIGHT
LCD TYPE	CSTN (Microreflective / Transmissive)
DRIVER	Duty: 1/132 Bias: 1/6
METHOD
VIEWING	6 O’clock
DIRECTION
BACK LIGHT	LED (white) *2
DRIVER IC	DA8912A

LCM TC5747 Single Chip CMOS Imager with Integrated Image Signal Processor and JPEG Codec

The TC5747 is a single chip VGA (640 lines over 480 pixels) color CMOS sensor with an integrated color processing and JPEG codec. It is designed to meet the requirements of cellular devices with low power consumption and miniature size. An embedded programmable core with dedicated hardware performs the sophisticated color processing. An embedded real-time JPEG encoder and compressed frames SRAM store JPEG images on chip. The TC5747 has flexible interfaces and supports multiple video output formats for easy integration into cellular phones. It supports a 16-bit host interface for fast data access and control.

Features

The TC5747 features a state-of-the-art architecture, allowing extremely low power consumption and miniature size. The following are the product highlights.

Sensor Array

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1/4" optical format

VGA resolution 640x480 5µm x 5µm square pixels Integrated 10 Bit ADC

RGB mosaic with micro-lens for high sensitivity

Double sampling for fixed pattern noise reduction

Separate gains for R, G and B

Programmable frame rate up to 20 fps VGA and 40 fps QVGA Programmable window size and filtered-option sub-sampling

Image processing

Embedded Image Signal Processor (ISP)

Embedded micro controller with 32 Kbytes program memory Faulty pixel mechanism

Loadable gamma correction tables

Automatic white balance

Automatic exposure control

Despeckle function

Enhanced dynamic range for backlight illumination

Programmable 3x3 color correction matrix

Programmable 3x3 sharpening or blurring matrix

Anti flicker for 50Hz and 60 Hz

Horizontal and vertical inversion

Digital zoom of 4X, 2X

Color adjustments such as: brightness, contrast, saturation Digital effects, such as monochrome, negative, sepia

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Frame or stamp overlay on the captured image (up to 320x240)

Down sampling by 2x, 3x, 4x, 5x, 6x, 7x, 8x

JPEG Codec

Real-time JPEG encoder and decoder for still images and M-JPEG for motion video

Compression of up to VGA YUV 422 format images

Decompression of up to VGA resolution, 4:2:2, 4:1:1, 4:2:0 format images

Programmable compression ratio, up to 1.8 bits/pixel for VGA image (JPEG compression is done in parallel with preview of the video on the LCD)

Thumbnail image support

Portrait images for phone book

Compression and decompression from the internal memory

Compression can be done after scaling and overlay of frame and stamp

Data Decompressed image can be resized and re-compressed

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CMOS Sensor

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Simple software API

Input clock frequency: 3.6MHz to 32MHz

Power consumption, VGA@ 15 FPS is 85 mW. (24 MHz)

Power management to support low power modes

Operation voltage 2.8 +/- 10%

Technology: 0.25 um s

Operation temperature: -10 to 60 degrees Celsius

Packaging types: module with lens. Module can have either flex cable or board-to-board connector. Several pin-out options will be supported to provide selected interface functionality.

Module size is 9.8mm x 9.45mm x 5.5mm

Horizontal and vertical sync signals

Host and LCM interface

Function block diagram

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Back Light

Key pad

The backlight on the module is single light guide. SW adjusts the brightness by changing the ON/OFF duty cycle of on-chip PWM generator.

The keypad is a matrix. The power key is connected to ground on one side

	C0		C1	C2	C3	and
						the
R0		Tactile switch [↑/ ←/↓/ →]
R1	[Rsk]		[Lsk]	[Send]	X

signal POWERKEY on the other. The columns, KEYCOL(4:0) are connect to the keyboard interface of DBB, and are usually driven low. The rows, KEYROW(4:0) are connected to the keyboard interface of DBB and are internal pulled-up. When a key is pressed, the appropriate row is connected to one of the columns, and forced low, then causing an interrupt.

The following is VS400 keypad matrix comparison table

Upper board

Ghost Key	[Power key]	Tactile switch [enter]

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Vibrator

I/O connector

Main-board

Ghost Key				[Capture]				[Mode]
		C0			C1		C2		C3	C4
R2		[3]			[6]		[9]		X	[#]
R3		[2]			[5]		[8]		[0]	X
R4		[1]			[4]		[7]		X	[*]

JAHWA JHV-10A2-F22A

Rated voltage 4.2 VDC

Rated current Typ. 50mA

Terminal resistance 32 ohm +- 20%

Rated speed Typ. 9000 ~ 18000 rpm

Mechanical noise Typ. 30dB

Operation temperature -30°C ~ 70°C

Storage temperature -40°C ~ 85°C

Mini-USB connector

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Adaptor

Voltage Range

Frequency

Minimum

Maximum Voltage

voltage

90Vac-2264Vac

47-63Hz

90Vac

264Vac

INPUT CHARACTERISTICS

Input Voltage and Frequency

The power supply shall meet all specifications when powered from

the following sources

Efficiency

The minimum efficiency shall not be less than 55% at full load,

rated input voltage.

Input Current

The maximum input current shall be less than 0.3 Arms maximum

at rated input.

AC Inrush Current

The AC mains single-cycle peak inrush current shall be limited to

30 amps cold and coinciding with the AC mains voltage 264Vac.

The power supply shall cause no damage with the hot start inrush

under 40 degree C ambient temperature.

Input Leakage Current

The leakage current shall not exceed 4mA at 240Vac/50Hz.

Over-Voltage Requirement (input)

The supply will operate safely up to 240Vac. the SMP must not fail

in catastrophic manner (i.e. no fire, Flames, sparks, melting)

OUTPUT CHARACTERISTICS

Output Voltage

The

power supply

shall be

regulated DC

output of

5.25+/-5%Vdc,the voltage shall be measured at the power supply

output connector.

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Output

Curren

t

Battery

Packing

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Battery cell – NEC&SGS Li-Ion 700mAh

SGS Cell + PCM

Description	Specification				Unit	Condition
Cell model	Sanyo-GS					LP433443A
Nominal	700				mA
Capacity					h
Nominal	3.7				V
Voltage
Charge	4.2±0.03				V
voltage
Final	2.75				V
discharge
voltage
Maximum	1050				mA	1.5C
Charge
Current
Maximum	1400				mA	2C
Discharge
Current
Internal	<140				mΩ
Resistance
Operating	0~45					Charge
Temperatu	-20~60					Discharge
re Range
Storage	-20~40					Within 6 months ;
Temperatu						Capacity recovery rate 85%
re Range
NEC cell + PCM
Description		Specification			Unit	Condition
Cell model			NEC			ICP340443AL
Nominal Capacity			700		mA
					h

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