Mic ETS2228 Maintance Manual

ETS2228 Maintenance Manual

Contents

Chapter 1 Overview...................................................................................................................................3

1.1 Brief Introduction of Product...............................................................................................3

1.2 Specifications of the Software and Hardware ..............................................................................4

Chapter 2 ETS2228 Principles.................................................................................................................5

2.1 Principles.......................................................................................................................................5

2.1.1 ETS2228 principle structure.................................................................................................5

2.1.2 Detailed Introduction to Functional Circuit Unit......................................................................6

Chapter 3 Detailed Introduction of Functional Module..............................................................................15

3.1 Power Part（including power supply and power management） ............................................. 15

3.2 Base Band Part............................................................................................................................20

3.3 Power Management Part ............................................................................................................20

3.4 RF Part........................................................................................................................................23

Chapter4 Engineering Mode and Test Mode.............................................................................................29

4.1 Entrance to engineering mode and test mode............................................................................. 29

Chapter 5 Troubleshooting....................................................................................................................... 30

Chapter 6 Nam Programming......................................................................................................................40

Chapter 7 Appendix....................................................................................................................................41

7.1 Damageable Spare Part List.......................................................................................................41

7.2 Schematic Circuit Diagram.........................................................................................................42

7.3 Mainboard Structure Diagram...................................................................................................42

7.4 Test Point Location Diagram...................................................................................................... 42

7.5 Abbreviations..............................................................................................................................43

ETS2228 Maintenance Manual

Chapter 1 Overview

1.1 Brief Introduction of Product

Based on the protocol IS-2000 and CDMA technology, supporting 450M/800M/1900M with jointing

different RF modules in PIPU, HUAWEI ETS2228 Fixed Wireless Terminal has the following features:

 Working on frequency 800M;  Voice services;  Call ID display, Call forwarding, Three-way calling, DTMF, Emergency calling;  SMS  Supporting CDMA2000 1X PS data service (MSM6025);  Being compatible with internal antenna or external antenna(external antenna connected with the

standard RF-connector, which can be disassembled);

 Power supply with charge battery or linear power adapter;  Supporting ROMSIM ;

ETS2228 Maintenance Manual

1.2 Specifications of the Software and Hardware

1.2.1 Introduction to software functions

Functional modules within software structure as follows:

(1)Application processing module: Management of voice service.

(2) Protocol shed processing module: to support the CDMA2000 1X standard and being compatible with the protocol IS-95. (3)Platform service sub-system: there the common platform to run the software, which includes starting, diagnosing, downloading, watch-dog etc. (4)Driver modules: to control the hardware, like RF modules, environment detecting, storage equipments. In additional, to control modulation and demodulation, to control user interface.

(5)Background Software Management Modules: to write the user configuration information into flash

and to replace configuration parameters to different software versions ,which to meet different operater’s requirements.

1.2.2 Specification of hardware

 Working Frequency Band: Uplink: 824MHz~849MHz；Downlink ：869MHz~894MHz

 Max. transmitting power: more than 23dBm；

 Max. inputting power: －25dBm；

 Receiving sensitivity : －104dBm；

 Interfaces: Date serial port: DB9 (female), for parameters configuration;

Antenna interface: for installing indoor or outdoor antenna; Power interface: for power supply;  Common power consumption while calling: 1.2W

Common standby power consumption: 40mW

 Dimension: 185 mm × 162 mm × 79 mm

ETS2228 Maintenance Manual

Chapter 2 ETS2228 Principles

2.1 Principles

ETS2228 Fixed Wireless Terminal (FWT) is composed by two boards, keypad and LCD etc. one board is Terminal Communication Process Unit (TCPU), the other one is Phone Interface Process Unit(PIPU).

The TCPU includes MSM6000 subsystem, Power supply and power management subsystem, RF subsystem and TCPU interface subsystem; the PIPU includes user interface subsystem(Serial port

protection module, AF channel 1, AF channel 2, Environment monitoring module and PCB version number check module ), power supply and power manager subsystem(Primary power supply module,

Primary power supply check module, Battery charge/discharge module, DC/DC power module, Power switch control module).

2.1.1 ETS2228 principle structure

Figure 1: ETS2288 FWT Structure

HUAWEI ETS2228 Fixed Wireless Terminal is composed of two boards and keypad & LCD. One

ETS2228 Maintenance Manual

board is Terminal Communication Process Unit (TCPU) and Phone Interface Process Unit (PIPU). The hardware architecture of FWT is shown in Figure 1.

The TCPU is the core of an FWT, including a radio frequency (RF) receiving and transmitting unit, a central processing unit and a power module.

The PIPU and the TCPU are connected through a 72-pin weld-pads (72 weld-pads locates around the TCPU, which to connect the PIPU in the castellation form). The PIPU provides functions of power

conversion from the external power into the power needed by system, battery charge/discharge management, voice signals processing. Besides the PIPU is the bridge between the TCPU and keypad &

LCD.

2.1.2 Detailed Introduction to Functional Circuit Unit

 Power-on Circuit(Battery and Power adapter)

When powering on WL71PIPU, the whole process as follows:

There are two ways of power supply: one is battery, the other is external power. When using the later one, VEXT_DC up to 5V, then PM6610 begins to work and software startups. At this moment,

some functions of software have been running and the system begins to detect and charge the battery, the display of LCD in charging status. If holding the Power-off key for 4S (keeping down the voltage of

TERM_ON), the process of Power-on will be closed, the software all in running, searching the net and being in idle status.

When using the battery, there is only the voltage of VREG_PHONE, the system keeping down the signal Term_on, PM6610 begins power conversion to the one needed by other modules and software

started up. The programme is the same if we turn on the Power-on switch: when turning it on, PM6610 and software starts up. The software only detects the Power-on switch being holding over 4S, it means

the normal power-on. If not, the process will be closed.

ETS2228 Maintenance Manual

Figure 2 Power-on Circuit With Battery

 Charging Circuit When charging or discharging to battery, the management module is controlled by MSM6000 in TCPU.

MSM6000 detects the voltage of the battery to output the signal CHG_EN, which control the charging to

battery or not. If needed, the system will charge the battery.

1. Battery discharging: If there is no external power, MSM6000 control PM6610 to power supply the

system by battery.

2. Battery charging: if there is external power, MSM6000 control PM6610 to charge the battery or not.

The battery is charged or not, which by controlling the output current form the secondary power. When the battery in fast charging status, the grid of Q303 is low and not through. The internal

differential amplifier (TL494) will control the pulse duty ratio of PWM, which the current output of switch power supply will be restricted to 830mA; when the battery in slow charging status, the grid of

Q303 is high and through. The internal differential amplifier (TL494) will control the pulse duty ratio of PWM, which the current output of switch power supply will be restricted to 75mA. Finally the fast

charging operation will be stopped and replaced by the slow charging operation. The feedback loop is accomplished by the internal differential amplifier (TL494).

ETS2228 Maintenance Manual

Signal Modules Function Description VREG_PHONE the secondary power conversion module the output of the secondary

power:4.44V

V_BATT

Battery－>PM6610

the battery output voltage

CHG_EN PM6610->TL494 PM6610:control the output

List 1 Battery Charging/Discharging Module Signals

Figure 3 Battery charging Circuit

Battery is connected to the output of the secondary power supply(4.4V) directly. When there is no

external power supply, battery powers the system supply through the signal VREG_PHONE, and there is

no special discharging control circuit.

 Audio Interface Circuit

ETS2228 audio interface includes handle receiver (the microphone and earphone is included),

speaker interface and hands-free MIC interface. The power of speaker is quit bigger than the others, which must be amplified through the audio amplifier, but for hands-free MIC interface and handle

receiver can be connected directly.

1）Handset MIC Interface。Bead and capacitor constitute the filter circuit.

ETS2228 Maintenance Manual

Figure 4 Handset MIC Circuit

2）Handle Receiver Interface. Bead and capacitor constitutes the filter circuit.

Figure 5 Handle Receiver Interface

3）Hands-free Interface Circuit

The audio amplifier amplifies EAR2 signal to speaker, the switch of speaker is controlled by the bias voltage of MIC2_P. And when the bias voltage of MIC2_P is zero, the voice channel and the audio

amplification is shut-down, which the system is in idle status. Possible faults of the hands-free channel: no ringing, then check whether U603 is wrong or not.

ETS2228 Maintenance Manual

Figure 6 Hands-free Interface Circuit

 LCD unit

In the ETS2228 FWT, LCD is a peripheral component. If wrong with LCD, it can be replaced

directly. The PIPU is compatible with the lattice LCD and the segment LCD, ETS2228 adopt the

lattice LCD.

ETS2228 Maintenance Manual

Figure 7 LCD Hardware Interface Circuit

FUNCTION DESCRIPTIONS

PIN NO.

1 This is the chip select signal. /CS1

2

3

4

5

SYMBOL

/RES

A0

R/W

E

applied is

of a resistive voltage divided

amp. Voltage levels are determined based on Vss,

ETS2228 Maintenance Manual

6~13 DATA BUS DB0~ DB7

14 Power supply VDD 15 Ground VSS

16 VOUT

17 CAP3P 18 CAP1N 19 CAP1P

DC/DC voltage converter.

20 CAP2P 21 CAP2N 22 23 V4 24 V3 25 V2 26 V1

27

This is a multi-level power supply for the liquid crystal drive. The voltage Supply

determined by the liquid crystal cell, and is changed through the use

or through changing the impedance using an op.

and must maintain the relative magnitudes shown below.

V0 ≧V1 ≧V2 ≧V3 ≧V4 ≧Vss

List 2 Lattice LCD Signals

 Keypad unit

In the ETS2288 series FWTs, the keypad is a peripheral component. If it is broken, it can be

directly replaced. And 72PIPU veneer uses 5×5 keypad。

CAP4P

V0

ETS2228 Maintenance Manual

Figure 10 keypad implements circuit

Figure 1 keypad back facet circuit

 Asynchronous serial port drive circuit

We put the drive of the serial port onto the serial port line. The output power level of

the serial port drive does not match the MSM6000 power level---The high power level of MSM6000 is

2.8V, while the high power level of the serial port drive is 4.4V. Thus, what is needed is to make a power-level conversion and protection circuit for the transistor to convert the power level of the serial

port circuit. The dual transient suppression diode protects the serial port and prevents the damage towards the system from abnormal power level input such as ESD.

Serial port signals are divided into 5 groups:

1) Data receiving signal RS_RD (Input); Data sending signal RS_TD (Output).

2) Traffic signal clearing/sending RS_CTS(Input); Request sending RS_RTS (Output)

3) Modem status signal (modem refers to FWT); Carrier wave detection UART1_DCD (Output);

Data terminal ready UART1_DRT (Output)

4) Serial port indicating UART1_IND (Output). The power level (high/low) is determined by the

serial port line. The power level differentiates debugging data line and high-speed data line. Low power level indicates high-speed (230400BPS) and high power level indicates low speed

(115200BPS).

5) External serial port drive power supply VDD1_RS. The power switch is controlled by the

MSM_P voltage.

The circuits are shown by the following diagrams:

ETS2228 Maintenance Manual

Input power level conversion circuit:

Figure 2 Input power level conversion circuit

Output power level conversion circuit:

Figure 3 Output power level conversion circuit

Data receiving signal power level conversion circuit. The power level conversion of signal UART1_RX is accomplished by clamp circuit. The reason lies in that the signal power-level needs to be lowered to detect whether or not the serial port line is connected when there are no data lines.

ETS2228 Maintenance Manual

Figure 4 Data receiving signal power level conversion circuit

Chapter 3 Detailed Introduction of Functional Module

3.1 Power Part（including power supply and power management） 1 .DC/DC power protect module

This part is chosen joint circuit .the external power over voltage protection module protects the

input power. When the input voltage exceeds 30V, the protection circuit will function. Then the silicon

controlled thyristor is in the continuity status and the self-healing fuse F301/F302 (we only need to joint

one of them and now we joint F301) will be blown. Thus, the power protection circuit will be cut.

ETS2228 Maintenance Manual

Figure16 External power over voltage protection module

2. DC/DC power module

The DC/DC power module generates 4.4V main power necessary for the operation of the whole machine. It also fulfills the constant current charging function. The maximum output current is 830mA.

We mainly use the PWM control chip (U302) and the switch transistor (Q301) to complete the

second-time switch power circuit. It is the switch power supply that converts the external power into

4.4V.

The PWM control chip adopts TL494, including 2 differential amplifiers, 1 external adjustable oscillator, 1 pulse comparer, 1 time overflow controller, and 1 output control circuit.

Figure 5 DC/DC Power transfer circuit

ETS2228 Maintenance Manual

Figure 6 TL494

The differential amplifier can work within the range from AC -0.2V to 0.2V. The time overflow

controller has a fixed offset to assure the stable output in case of the changed external input. The external oscillating circuit can be set through Rt/Ct (The working frequency to be set is 100KHZ).

3 .Power supply anti-reverse-insertion circuit and external

interface

D305 and D301 fulfill the anti-reverse=insertion function of the external power supply. EXT_DC

signal: Whether or not the external power supply exists; V_BATT signal: Battery voltage; VREG_PHONE signal: Voltage of the second-time power supply.

ETS2228 Maintenance Manual

Figure19 Anti-reverse-insertion circuit

4 .Second-time power voltage-limiting module

The second-time power voltage-limiting module limits the second-time power voltage to 4.4V.

When the constant current charging operation is ended, the second-time power output is stabilized to

4.4V to provide power for the back-level circuit.. The feedback loop is accomplished by operational

amplifier 1 of TL494.

ETS2228 Maintenance Manual

Figure 7 Second-time power voltage-limiting module

5 .Battery temperature switchover module

The temperature’s measure is finished on TTPU veneer, and the battery’s ID measure is finished on PIPU veneer.

This module converts the thermistor into voltage and sends the voltage to ADC on the TCPU board

to be measured. Thus, the battery temperature will be measured.

See the following figure for the circuit.

Figure21 Battery temperature switchover module

ETS2228 Maintenance Manual

PM6610 PIN NO. Function Description Signal Name HKADC5 Veneer temperature

sampling

HKADC8 Battery temperature

sampling

HKADC9

Battery identify（Battery ID）

Table 1 Environment variable measure PIN

PHONE_THERM

BAT_TEMP

BAT_ID

3.2 Base Band Part

The MSM6000 sub-system includes voice coding/decoding unit, baseband signal processing unit,

and CPU system on which protocol software runs. All these functional units are integrated into the MSM6000 chip. The main function of the voice coding/decoding unit is to conduct compressing and

coding operations over 64K voice and digital code traffics like EVRC codes, to let them be suitable for

being transmitted in wireless environment. The baseband signal processing unit mainly includes

functions like baseband modulation/demodulation and channel coding/decoding. It also includes the CPU system through which protocol software runs, as well as FLASH for storing software and SRAM

for running software.

3.3 Power Management Part

Power management sub-system mainly fulfils DC-DC converting of external input power and managing power voltage which is used by inside circuit.

The function of power management can be divided to two parts: battery management and veneer circuit’s power management. Battery management mainly supplies the functions of charging/discharging

management and temperature protect etc. veneer circuit’s power management manages power of veneer unit circuit in order to reduce equipment’s power consumption according to operation state .Such as user

interface circuit ,RF transmitter,MSM6000 all can be set dormancy state to reduce equipment’s power

consumption a lot.

See the following table for Power management module interface signal:

ETS2228 Maintenance Manual

Signal

direction

I

Signal name Signal flow Signal function Receive unit’s PIN

name

ONE

VREG-PH

interface→PM6610

Interface board

power supply power

VDD，supply power to

PM6610

ICHARGE_P(3

),

VDD-ANA(12)

、

VDD-MSM(15)

、

VDD-MAIN(30

)

VEXT-DC

interface→PM6610

V-BATT interface→PM6610 Stakeout battery

prescription of

external power supply

VCHARGER(1

)

ICHARGE_M(

I

O

I

O

voltage，directly connect

to +pole of battery

TCXO TCXO→PM6610 Main frequency

input signal

BUFF-TC

XO

PM6610→MSM6000 Main frequency

output signal

TCXO-EN MSM6000→PM6610 TCXO enable

signal

PS-HOLD

、

JTAG ON

MSM6000→PM6610 MSM6000→register

unit

Control whether supply power to

MSM6000 continuance

TERM ON interface→PM6610 Control

replacement signal

4)

TCXO-IN(24)

TCXO-OUT(23

)

TCXO-EN(25)

PS-HOLD(7)

KBDPWR-ON(

8)

ETS2228 Maintenance Manual

which produces power

chip

I

O

SBI-ST

SBI-CK

SBI-DT

KEY_BAC

KLIGHT

VERG-TC

XO

VREF-RF

RX

VREG-MS

MSM6000→PM6610

MSM6000→interface

PM6610→TCXO

PM6610→RFR6122

PM6610→MSM6000

MSM6000 control signal

keypad back facet drive headstream

Supply TCXO

voltage which produces circuit

Supply voltage to RFR6122

Supply digital

SBST(22)

SBCK(21)

SBDT(20)

KEYBD-DRV(

10)

VERG-TCXO

（32）

VREG-RFRX(3

1)

VREG-MSMC(

MC

signal voltage to

14)

MSM6000

O

MP

VREG-MS

PM6610→others

Supply voltage to

kinds of external

16)

equipment

O

MA

VREG-MS

PM6610→MSM6000

Supply analog signal voltage to

11)

MSM6000

O

VREG-RF

PM6610→RFT6122

TX

O

SLEEP-CL

PM6610→MSM6000

K

Supply voltage to

RFT6122

Supply dormancy signal to MSM6000

9)

)

VREG-MSMP(

VREG-MSMA(

VREG-RFTX(2

SLEEP-CLK(19

ETS2228 Maintenance Manual

O

RESIN-N

PM-INT-N

Table 2 power management module interface’s signal description

PM6610→MSM6000

Supply replacement

signal to MSM6000

Supply break request signal to

MSM6000

3.4 RF Part

ETS2228 is the FWT working in the 800M frequency band .The structure of the FWTs which use

WL71PIPU but working different frequency band is the same and the difference is RF part.

1 .Receiving unit

PON-RESETB(

5)

MSM-INTERU

PTB(6)

Unit function: After the duplex module sufficiently suppresses the out-of-band spurious filter, the received radio frequency signals will be sent to the down-convert frequency mixer via the radio

frequency low noise amplifier and radio frequency SAW filter to experience the frequency mixing

operation. Since RFR6120 assumes the “Zero Intermediate Frequency” structure, the radio frequency

signal can be directly converted into baseband signals. The following operations are I/Q demodulation

and filter amplifying, and ADC processing. Finally, the digital base band signal will be sent to baseband processing unit MSM6000.

ETS2228 Maintenance Manual

Figure 8 RF receiving unit

2 .Transmit unit

Primary unit function: Emission modulation module RFT6120 directly amplifies analog I/O signals

after DA conversion. Next, radio frequency signals are generated after RF Mixer and RF filter function on the signals. Then the RF signals are amplified by the RF amplifier, so that RF emission signals set

with certain output power value are generated. Finally, after the duplex module sufficiently filters out-of-band spurious emission signals, the signals will be sent to the antenna. The other function of the duplex module is to prevent the emission signals from disturbing the work of the receiver.

ETS2228 Maintenance Manual

Table 9 RF emission unit

3 .RF tracing unit

The main unit function is to provide RF local oscillation signals for transceiver. The RF duplex interval is 45MHz. Therefore, we design the RF oscillator to be shared by both receiving and

transmitting operations. For both of them receiving and transmission operations, the RF local oscillator is high. The reference clock signal frequency is 19.2MHz and the phase detection frequency is 25 KHz. The Rx PLL circuit is integrated into RFT6122, but RX VCO and RX LO are still in RFR6122.

Fv TCXO

RX-CP

Loop filter

ETS2228 Maintenance Manual

LOCK

Counter

RFT6122

R

Digital logic

Fr

Phase checking

Rx-LO-IN

N

SBI control

RX-FAQ

VCO-TUNE

RX

RFR6122

VCO

LO-OUT

RX LO

note：Red signal is the definition of RFT pins, blue signal is the definition of RFR PIN, green signal is the definition of interface.

Table 10 PLL circuit

RX-QP/RX-QM/RX-IM/RX-IP refers to the output of 4 baseband signals. They are to be sent to MSM to be processed. SBST/SBCK/SBDT are 3 control BUSES. MSM controls RFR6122 by

controlling these three signals. The TCXO signal provides clock reference signals for all internal components. Three categories of power provide power for RFR: VREG-RFRX provides power voltage

for PM6610; VREG-TCXO provides voltage needed by the clock for RFR6122; VREG-MSMP provides voltage for internal RFR6122 components. RF local oscillation signals are for receiving/transmission

channels to conduct down/up conversion operations. Both channels share the same RF local oscillation signal.

ETS2228 Maintenance Manual

3.5 Parameter Indices 1 .Performance Indices

 Primary indices of the receiving unit:

（1）Basic indices

（2）Frequency range: Work frequency 869MHZ--894MHZ MHz

（3）Noise coefficient under sensitivity condition: <=7.5dB (Note: Including the loss from

duplexer)

（4）Linearity requirement

（5）Sensitivity capability indices：≤-106dBm/1.23MHz

（6）Amplitude frequency characteristics

（7）Amplitude range：<±1dB, within 1.23MHz（After being calibrated）

（8）double-work distance：10MHz

（9）channel distance：25 KHz

 Primary indices of the emission unit:

（1）Frequency range: 824MHZ～849MHZ MHz

（2）Maximum emission power:>23dBm

（3）Maximum linearity output power: 28 dBm

（4）ACLR requirement：-42dBc/30KHZ@885KHZ～1.98MHZ

-56dBc/[email protected]～4MHZ

（5）In-band low-noise requirement

Under the condition of the minimum output power, the low noise should be lower than

-54dBm/1.23MHZ

 PLL indices:

ETS2228 Maintenance Manual

Reference source signal indices:：

（1）Frequency 19.2MHz

（2）Frequency error ±2ppm（-30℃～85℃）

（3）Output signal amplitude 0.5Vpp（min）

Indices of emitting and receiving intermediate frequency local oscillation signals

：Zero intermediate frequency method

RF local oscillation signals Indices：

（1）Output frequency: 1664～1788MHz；

（2）Output power: -12dBm

2 .Electric Indices

ETS2228 Maintenance Manual

Chapter4 Engineering Mode and Test Mode

4.1 Entrance to engineering mode and test mode

1、Entering test mode ：

Inputting keypad command ＃＃10999* to enter factory test mode：

 Press 4 to hands-freeing voice loopback.  Press 6 to handle loopback.  Press “Delete” long time to LCD test in which all LCD will light and ring utter afterwards.

2、Entering RF calibration－FTM mode ：

Open tool software QXDM and input “mode offline－d” in command window to modify 453NV as

“1”（”0” for normal mode ）

ETS2228 Maintenance Manual

NO NO

good.

TL494(U302)

is good

NO NO NO

Chapter 5 Troubleshooting

（1）Troubleshooting Procedure of the Baseband

1、Power fault maintenance procedure

power-on and startup

YES

Check if the voltage of foot 4 of U302 is 1.25V.

Check if Q301 is

YES

Check if

YES

Check if R312(0.1ohm) is good

YES

Check if D304 is good

Chiefly check if CE junction of Q301 is good

Check if the voltage of foot 4 of U302 is 5V.

Figure 11 Power fault maintenance procedure

YES

End

ETS2228 Maintenance Manual

NO

J404 is 2.84V

？

3 of X501 is 19.2MHz.

NO

2、Initialization fault maintenance procedure

power-on and startup

YES

Is the voltage of pin 10 of

YES

Any 19.2MHz clock signal

on E17 of U701?

YES

Any clock signal on TP801?

YES

Check if the clock output of pin

Check if the clock signal on the channel of X501 is normal.

Download software again or replace TCPU.

Is LCD normal?

Figure 12 Initialization fault maintenance procedure

Check the LCD interface signal of PIPU and restore the LCD.

End

ETS2228 Maintenance Manual

NO

NO NO

3、Key-press fault maintenance procedure

power-on and startup

YES

Does LCD respond after

the key is pressed?

YES

Doed LCD show value of

the key pressed?

YES

Does the keypad respond to data corrrectly?

YES

Check inter-board connection power

and replace the fault cable.

Check if keys are reliably connected with

the keypad and remove faults.

Replace the keypad or the mechenical part upper-lid on the fixed station.

YES

Figure 13 Key-press fault maintenance procedure

End

ETS2228 Maintenance Manual

4、LCD display fault maintenance procedure

Figure 14 LCD LCD display fault maintenance procedure

ETS2228 Maintenance Manual

5、Hands-free fault maintenance procedure

Figure 15 Hands-free fault maintenance procedure

ETS2228 Maintenance Manual

6、Charging fault maintenance procedure

Figure 16 Charging fault maintenance procedure

ETS2228 Maintenance Manual

7、Data service fault maintenance procedure

Figure 17 Data service fault maintenance procedure

ETS2228 Maintenance Manual

（2）RF Processing Module Fault Maintenance Procedure 1、RF Channel Fault Maintenance Procedure

Figure 18 RF Channel Fault Maintenance Procedure

ETS2228 Maintenance Manual

2、RF receiving channel fault maintenance procedure

Figure 19 RF receiving channel fault maintenance procedure

ETS2228 Maintenance Manual

3、RF emission channel fault maintenance procedure

Figure 20 RF emission channel fault maintenance procedure

ETS2228 Maintenance Manual

Chapter 6 Name Programming

Please refer to Key Command Operation Guide.enclosed.

ETS2228 Maintenance Manual

Chapter 7 Appendix

7.1 Damageable Spare Part List

Code Name

03020ASS

02235191

Manufactured board-T601-450AS-WL71PIPB-RASYS FWT interface module-1*2

T601-450AS,Phone type FWT Series Generally Parts Set,Graphic

LCD,White,For ETS2X28

Location Number

Suit 02130633 Primary power supply--5degC-45degC-190V-300V-(12V+/-5%)/0.5A Accessory 24020480

48020117 07050057

04050038

Rechargeable battery,Nickel Metal Hydride Battery,3.6V,1.0Ah,Battery Pack,53*45*15.5mm

Lens-DKBA8.074.1486-Segment lens（argentate）-SU2xx8 PTC,0.29ohm,750mA,PTC,THT,11.0*16.5*3.1mm,Mobile Dedicated Made Wire,RF Cable,0.15m,TNC50SF-Ⅰ,RG316-50-1.5/0.5BR-Ⅰ,For

Accessory

F301

J401

Terminal 15050150 Dynatron -PNP-100V-3000mA-3000mW-0.8V-SOT223-25 Q301 07040002 Varistor,27V,50A RV301 16100002 Tact Switch,FKX,2*3,2P2T,6PIN S101

Audio Frequency Circuit,MC34119D,Amplifier Of Telephone 39040062

Application,2V to 16V,SOIC8（Tape）

U603

39110327 Control Chip,PWM Controller,SO16,Mobile Dedicated U302 51620041 51620042

DKBA8.035.1320,Shielding Box,6025 Module(450M)

DKBA8.035.1321,Shielding Box Cover,6025 Module(450M) 13080003 Duplexer,824~849MHz/869~894MHz,2.1dB.,2.8dB.,21dB. U101 39110306 Voltage Regulator,3.0V,3%,0.15A,SOT-23-5,Mobile Dedicated U204 13010058 S.A.W.FILTER-836.5MHz-2.2dB-100V-SMP U201

39200019

Terminal Dedicated IC,RFT6122 Baseband-to-RF

Transmitter ,2.85V,32QFN

U301

13010086 SAW filter-881.5MHZ-2.4DB->250V-QCS5A Z401

Power Amplifier 47100048

Module-824-849MHz-Ghigh=29dB,Glow=26.5dB-28dBm-10-pin M7

U202

4*4 39200018

Terminal Dedicated IC,RFR6122 RF-to-Baseband

Receiver,2.85V,32QFN

U401

Terminal Dedicated IC,PM6610 Power Management,3.6V,QFN32,Used 39200022

with MSM6000（39200021）

U601

39200021

with MSM6000（39200021） 40060083 FLASH-2M*16BIT FLASH+512K*16BIT SRAM-5MHZ-64KB-2.7V U801

Terminal Dedicated IC,PM6610 Power Management,3.6V,QFN32,Used

U701

ETS2228 Maintenance Manual

12070006 TCXO,19.2MHz,2.8V,2.5ppm,-30degC,85degC X501 12020102 TCXO -32.768KHZ X601

39080088

Operation Amplifier,Headphone Audio Power Amplifier with Digital

Volume Control,2.0V~5.5V,1MHz,Stereo,LLP,Terminal Dedicated

U602

7.2 Schematic Circuit Diagram

7.3 Mainboard Structure Diagram

Please refer enclosed pages for BOM Schematics & Silk Screen.

7.4 Test Point Location Diagram

ETS2228 Maintenance Manual

7.5 Abbreviations

Abbreviation English PLL

ACLR Adjacent channel leakage power radio RF Radio frequncy LCD Liquid crystal display LNA Low noise amplifier CDMA Code-division multiple access PCM Pulse coded modulation USB Universal serial bus UART Universal Asynchronous Receiver TCXO Temperature-compensated crystal oscillator Rx Receive Tx Transmit

Phase lock loop

*******