Download ETS1201 Series Fixed Wireless Terminal Maintenance Manual

ETS1201 Fixed Wireless Terminal Maintenance Manual
Contents
Chapter 1 FWT Working Principles and Parameters ................................................................. 1-1
1.1 Hardware Structure and Working Principles ...................................................................... 1-1
1.2 Hardware Structure Description of FWT Major Functional Modules ................................. 1-2
1.2.1 Hardware Structure of the TCPU ............................................................................ 1-2
1.2.2 Hardware Structure of the TUTU ............................................................................ 1-4
1.3 Function Description of FWT Major Functional Modules ................................................... 1-5
1.3.1 User Interface Subsystem ....................................................................................... 1-5
1.3.2 Power Supply and Power Supply Management Subsystem ................................. 1-14
1.3.3 QSC6020 Subsystem ............................................................................................ 1-19
1.3.4 RF Subsystem ....................................................................................................... 1-19
1.4 Parameter Index .............................................................................................................. 1-21
Chapter 2 Guide to FWT Assembly/Disassembly ...................................................................... 2-1
2.1 Assembly of FWT .............................................................................................................. 2-1
2.2 Disassembly of FWT .......................................................................................................... 2-3
Chapter 3 Repair Process and Troubleshooting ........................................................................ 3-1
3.1 Repair Process .................................................................................................................. 3-1
3.1.1 Repair Process of Baseband Processing Interface Module Failure ....................... 3-1
3.1.2 Repair Process of RF Processing Module Failure .................................................. 3-3
3.2 Troubleshooting ................................................................................................................. 3-5
Chapter 4 List of Damageable Spare Parts ................................................................................. 4-1
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ETS1201 Fixed Wireless Terminal Maintenance Manual
Chapter 1 FWT Working Principles and
Parameters
1.1 Hardware Structure and Working Principles
Figure 1-1 Hardware structure of ETS1201FWT
Huawei ETS1201 Fixed Wireless Terminal (FWT) consists of two boards. One is the
FWT communication process unit (TCPU) and the other is the interface processing unit
(TUTU). Figure 1-1 shows the hardware structure of the FWT.
The TCPU is the core unit of the FWT. It consists of the RF transceiver unit, central
processing unit, power unit, and power monitoring unit.
The TUTU and TCPU are connected through a 72-pin solder cup. (There are 72 solder
cups on the four borders of the TCPU. They are soldered to TUTU like a fort. ) The
TUTU provides the function to connect to the TCPU. It provides various interfaces,
including the USB Interface. External DC power inlet, battery interface, power switch,
POTS interface, extended facsimile interface, indicator light interface, antenna
interface, and R-UIM interface.
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1.2 Hardware Structure Description of FWT Major Functional
Modules
The hardware system of the FWT consists of two boards. They are TCPU and TUTU.
The FWT functional modules include the user subsystem, power subsystem, QSC6020
subsystem, and RF subsystem. Each board has its own functional modules. Classified
by function, the TCPU functional modules include the QSC6020 subsystem, power and
power management module part, RF subsystem, and TUTU interface module. The
TUTU functional modules include:

User subsystem, which consists of the Subscriber Line Interface Circuit (SLIC)
interface module, R-UIM card interface module, extended facsimile interface
module, indicator module, and environment variable monitoring module.

Power and power management module part, which consists of the primary power
interface
protection
module,
primary
power
detection
module,
battery
charging/discharging module, DC/DC power module, and the on/off control
module.
1.2.1 Hardware Structure of the TCPU
Figure 1-2 Hardware structure of the TCPU board
For the ETS1201, the major difference of the hardware part is the frequency of the RF
module on the TCPU board. The ETS1201 uses the 800 MHz RF module. The
structures of TCPU boards working on different frequencies are the same.
The TCPU board can be divided into four parts: QSC6020 subsystem, power and
power management module part, RF subsystem, and TUTU interface module, as
shown in Figure 1-2.
The QSC6020 subsystem consists of the speech codec unit, baseband signal
processing unit, and the CPU system used to run the protocol software. All these
functional units are integrated in the QSC6020 chip. The speech codec unit realizes
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the compressed coding of 64 kbps speed data stream, for example EVRC coding, so
that the data can be transmitted over the radio network. The baseband signal
processing unit implements the baseband modulation and demodulation and channel
codec functions. It also consists of the CPU system used to run the protocol software
and applications. Besides, this subsystem also contains the FLASH used to store the
software and the SRAM used to run the software.
The power and power management module part realizes functions related to the
system power supply and power management.
The RF subsystem consists of the RF processing unit and the antenna feeder system.
The RF signal processing unit realizes the modulation/demodulation of baseband
signals, power amplification, and up/down-convert functions. It converts the baseband
signals into the RF signals for radio transmission, or converts the RF signals into the
baseband signals. The interface involved in the CDMA2000 1x Um interface.
The TUTU board provides the power interface, PCM interface, USB interface, FAX
interface, R-UIM interface, and indicator light interface. It is a 72-pin solder cup. As the
TCPU board can be used in ETS1201 FWT, the interface meets the requirements of
these two series products.
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1.2.2 Hardware Structure of the TUTU
Power
switch
DB9
USB
Protection
module
Primary power
module
port
Serial
USB port
protection
Protection
module
module
On/off
control
DC/DC
power
module
Antenna
interface
Antenna
Secondary
power
SLIC
module
Facsimile
extended
interface
module
72Pin
TCPU
module cup
Indicator
interface
Indicator
Charging
control
R_UIM card
Peripheral
component
R_UIM
card
interface
Battery
Charging
circuit
Interface with the
peripheral
component
Circuit on the
board
Verification circuit
Figure 1-3 Hardware structure of the TUTU board
As shown in Figure 1-3, the TUTU board consists of the user subsystem and the power
and power management module part.
The user subsystem consists of the SLIC interface module, SPI module, R-UIM card
interface module, extended facsimile interface module, indicator light module, and
environment variable monitoring module. The power and power management module
part consists of the primary power interface protection module, primary power detection
module, battery charging/discharging module, DC/DC power module, and the on/off
control module.
1)
The SLIC interface module receives and transmits the voice signals, sends the
ringing tone and signal tone (such as dialing tone, busy tone, hooking prompt tone,
and service prompt tone) to the common telephone set, sends the calling number
to the common telephone set, and receives the dialed number.
2)
The SPI module realizes the ESD protection function and signal level conversion.
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ETS1201 Fixed Wireless Terminal Maintenance Manual
3)
The R_UIM card interface circuit serves as the interface for the communication
between the CPU system and the R_UIM card. It also supplies power to the
R_UIM card and realizes the power protection function.
4)
The extended facsimile interface provides the control interface, simulated two
wires, and asynchronous serial port required by the facsimile board.
5)
The indicator light module provides four RSSI indicators light, a dual-color batter
indicator light, and a power indicator light.
6)
The environment variable monitoring module completes the board temperature
detection, battery temperature sampling, and battery ID detection functions.
7)
The primary interface protection module completes the anti-static and
over-voltage protection functions.
8)
The
battery
charging/discharging
module
completes
the
battery
charging/discharging management function.
9)
The DC/DC power module completes the secondary conversion of DC power
inside the board. It also provides the voltage stabilizing and constant current
functions for the charging/discharging circuit.
10) The on/off control module controls the on and off of the external tact switch,
startup of the primary power, and closedown of the software.
Besides the above modules, there are also the interface components such as the
connection solder cup between the TUTU and TCPU and USB connector.
1.3 Function Description of FWT Major Functional Modules
1.3.1 User Interface Subsystem
I. SLIC interface module
The SLIC interface module is located between the speech codec integrated in the
QSC6020 chip and the terminal user. It constitutes the analog channel (except the G3
facsimile function) of the TUTU. This analog channel completes the following functions:

Receive and transmit the voice signals.

Send the ringing tone and signal tone (such as dialing tone, busy tone, hooking
prompt tone, and service prompt tone) to the common telephone set.

Send the calling number to the common telephone set.

Receive the dialed number.
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Figure 1-4 Structure of the TUTU
In Figure 1-4, the part between the two dashed lines is the user interface module
(TUTU) and the section enclosed by the dashed line is the SLIC interface module. The
SLIC interface module consists of the SI3210 chip supplied by the Silicon Laboratory
and some peripheral circuits. The chip can provide the SLIC, codec, DC-DC circuit,
Dual-Tone Multi-frequency (DTMF) detection, and other functions used to generate
signals required by the analog phone.
The following introduces the working process of the SLIC interface module:
Transmit channel: The analog voice signal is sent from the telephone set to the RJ11
interface of the TUTU through the telephone line. The signal reaches the SI3210 and
then is converted into the analog voice signal by the SLIC. After the sampling and
coding of the codec, the signal is finally output as the standard PCM stream and sent to
the PCM interface of the QSC6020.
Receive channel: The voice data from the peer end is sent from the PCM interface of
the QSC6020 to the codec of the SI3210 chip. The digital signal is converted to the
analog voice signal by the codec and then demodulated by the SLIC onto the telephone
line. Then the signal reaches the telephone set through the telephone line.
The DTMF signal generated by keys on the telephone set is processed by the SLIC and
codec and converted into the binary key values. Then the key values are reported to
the QSC6020 through the SPI interface.
The ringing tone, signal tone, service prompt tone, and calling number are generated
and controlled by the QSC6020 module. The QSC6020 writes the parameters and
commands into the codec through the SPI interface. Then the codec generates the
corresponding signal and sends the signal to the telephone set through the SLIC.
As the interface levels of the SLIC and QSC6020 are not consistent, the level
conversion between the output signal of the SLIC and the input signal of QSC6020 is
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ETS1201 Fixed Wireless Terminal Maintenance Manual
completed by the adaptation resistor. Figure 1-5 shows the circuit used for level
conversion between the SLIC output signal and QSC6020 input signal.
Figure 1-5 SLIC- QSC6020 interface level conversion circuit
There are three types of interface between the SLIC and other units. They are the PCM
stream interface, SPI interface, and the subscriber line audio interface connected with
the external telephone set.
1)
The PCM interface is the digital audio interface between the SLIC and the
QSC6020. It transmits the telephone voice digital signal in the PCM format. This
interface is implemented through the inter-board interface.
Table 1-1 PCM interface between the SLIC and the QSC6020
PCM interface
SI3210 pin
Inter-board
interface
Direction
QSC6020 pin
PCM_PCLK_A
PCLK (3)
PCM_PCLK
IN
GPIO_6
PCM_FSC_A
FSYNC(6)
PCM_FSC
IN
GPIO_3
PCM_DR_A
DRX (4)
PCM_DR
IN
GPIO_4
PCM_DX_A
DTX (5)
PCM_DX
OUT
GPIO_5
Inside the SI3210, the internal clock signal of the SI3210 is generated through PLL by
using the PLCK as the reference clock. The PCLK must be synchronous with the 8 kHz
FSYNC. Available frequencies for the PCLK include 256 kHz, 512 kHz, 768 kHz, 1024
kHz, 1536 kHz, 2048 kHz, 4096 kHz, and 8192 kHz. The read/write timing diagram
please reference the figure 8 in SI3210 datasheet.
2)
SPI interface allows the QSC6020 to configure the SI3210 parameters and collect
information. This interface is implemented through the inter-board interface.
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Table 1-2 SPI interface between the SI3210 and the QSC6020
SPI interface
SI3210 pin
Inter-board
interface
Direction
QSC6020 pin
SMI_CLK
SCLK (38)
SMI_CLK
IN
GPIO_0
SMI_CS_N
CS (1)
SMI_CS_N
IN
GPIO_36
SMI_DIN
SDI (37)
SMI_DIN
IN
GPIO_2
SMI_DOUT
SDO (36)
SMI_DOUT
OUT
GPIO_1
The read/write timing diagram please reference the figure 7 in SI3210 datasheet.
II. Hold detect circuit
To reduce the power consumption in the standby mode, the SLIC is in the dormant state
in the standby mode. At this time, if the user picks up the phone, the action cannot be
detected. Thus, the external hold detect circuit is designed. In this way, when the SLIC
chip is in the dormant state, the hold detect circuit can detect the off-hook of the user
and report it to the CPU so as to respond to the user.
Figure 1-6 shows the negative voltage circuit and Figure 1-7 shows the hold detect
circuit.
Figure 1-6 Negative voltage circuit
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ETS1201 Fixed Wireless Terminal Maintenance Manual
Figure 1-7 Hold detect circuit
III. SPI module
The ETS1201FWTs provides the asynchronous serial interface or USB interface for
control purpose.
1)
The USB transceiver is provided by QSC6020 on the TCPU board. The major
functions of the TUTU are implemented by the USB circuits of the QSC6020
subsystem, including the ESD protection circuit.
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ETS1201 Fixed Wireless Terminal Maintenance Manual
Figure 1-8 USB interface circuits
IV. R_UIM card interface circuit
The R_UIM card module consists of the R_UIM card power supply, connector, and ESD
protection circuits.
Table 1-3 describes the signals of the interface between the R_UIM card interface
module and other unit
Table 1-3 Signal description of the R_UIM card interface module
Signal
Source or destination module
Function description
VREG_PHONE
Inter-board interface module
UIM card power supply
R-UIM_RST
Inter-board interface module
UIM card reset signal
R-UIM _CLK
Inter-board interface module
UIM card clock signal
R-UIM _DAT
Inter-board interface module
UIM bidirectional
signal
R-UIM _EN
Inter-board interface module
UIM enable signal
data
the implementation of the UIM card interface is shown as Figure 1-99. The diode
provides the ESD protection for signals. The UIM card power is supplied by the LDO
with the one-way output and the switch function. The seamless interface with the
QSC6020 can be realized for the reset, clock, and data signals of the UIM card.
The following figure shows the design:
Figure 1-9 UIM card circuit diagram
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ETS1201 Fixed Wireless Terminal Maintenance Manual
The VDD_SIM power of the ETS1201 is provided by the power management chip on
the TCPU board. The UIM card is directly powered through the R-UIM_EN, as shown in
Figure 1-100.
Figure 1-10 ETS1200 VDD_SIM power
V. Extended facsimile interface
The extended facsimile interface provides interfaces for the extended facsimile board.
These interfaces include the asynchronous serial interface and the PCM interface. The
major function of the facsimile board is bidirectional conversation between the 64 kbps
digital PCM stream and the facsimile data or signaling (such as the V.21 protocol).
Table 1-4 describes the signals of the extended facsimile interface module:
Table 1-4 Signal description of the extended facsimile interface and protection module
Signal
Source or destination module
Direction
Function description
FAX_RD
Inter-board interface module
IN
Serial port receiving
FAX _CTS_N
Inter-board interface module
IN
Serial port clear to send
FAX _RTS_N
Inter-board interface module
OUT
Serial port ready to send
FAX _TD
Inter-board interface module
OUT
Serial port transmitting
FAX_EN_N
Inter-board interface module
IN
Facsimile enable signal
RING
SLIC module
IN
Two-wire telephone line
TIP
SLIC module
IN
Two-wire telephone line
VREG_ FAX
DC/DC power module
IN
3.2 V main power
The extended facsimile interface module provides the control interface, simulated two
wires and asynchronous serial port required by the facsimile board. Figure 1-11 shows
how these interfaces are implemented:
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ETS1201 Fixed Wireless Terminal Maintenance Manual
Figure 1-11 Circuit of the extended facsimile interface module
VI. Indicator light module
The indicator light module provides four RSSI indicators light, a dual-color batter
indicator light, and a power indicator light. It is driven by the QSC6020 on the TCPU
board.
Table 1-5 describes the signals of the interface between the indicator light module and
other units.
Table 1-5 Signal description of the indicator light module
Signal
Source or destination
module
Direction
Function description
VERG_PHONE
DC/DC power module
OUT
LED power
RSSI1
Inter-board interface
module
IN
Intensity indication
RSSI2
Inter-board interface
module
IN
Intensity indication
RSSI3
Inter-board interface
module
IN
Intensity indication
RSSI4
Inter-board interface
module
IN
Intensity indication
STAT1
Inter-board interface
module
IN
Battery state indication
STAT2
Inter-board interface
module
IN
Battery state indication
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ETS1201 Fixed Wireless Terminal Maintenance Manual
Signal
STAT3
Source or destination
module
Inter-board interface
module
Direction
IN
Function description
External power
state indication
supply
Figure 1-122 shows the circuit of the indicator light module. The QSC6020 on the
TCPU board provides the drive signal. The control signal of the indicator light is the
positive logic, that is, the indicator light is on when there is high level.
Figure 1-12 Circuit of the indicator module
VII. Environment variable monitoring module
This module completes the board temperature detection and battery temperature
sampling function.
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ETS1201 Fixed Wireless Terminal Maintenance Manual
Table 1-6 Pin assignment of the environment variable monitoring module
QSC6020 pin
Function description
Signal
HKAIN0
Board temperature sampling
TERMINAL_THERM
HKAIN1
Battery temperature sampling
BAT_TEMP
Board temperature detection is completed on the TCPU board.
Figure 1-13 shows the battery temperature sampling circuit:
Thermal resistor
Figure 1-13 Battery temperature sampling circuit
The battery temperature measurement range is between -10°C and 55°C.As shown in
Figure 1-133, the thermal resistor is used. Within the above temperature range, the
resistance variation range of the thermal resistor is between 282.1 kΩ and 14.44 kΩ.
Thus, for the 10-bit ADC sample (1023 corresponds to 2.5 V. The accuracy of the
sampling value is 0.0025 V), the corresponding values are respectively 813 and 124.
1.3.2 Power Supply and Power Supply Management Subsystem
I. Primary Power Supply Interface Protection Module
The external power supply over-voltage protection module protects the input power
supply. When the input voltage exceeds 30V, the resistance of the varistor RV301 turns
to infinity. If the current is too high, the PTC automatic restore fuse RT501cut-off the
power supply to protect the back circuit. See Figure 1-144
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ETS1201 Fixed Wireless Terminal Maintenance Manual
Figure 1-14 External power supply over-voltage protection module
II. DC/DC Power Supply Module
The DC/DC power supply provides the 4.4V main power for the whole system. Its
maximum output current is 830 mA. The module mainly uses the PWM control chip
(U501) and switching tube (Q501) to implement the secondary switching power supply
circuit. The switching power supply can convert external power supply to 4.4 V. See
Figure 1-15.
Figure 1-15 Power supply conversion circuit
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ETS1201 Fixed Wireless Terminal Maintenance Manual
The PWM control chip adopts the TL494, including two differential amplifiers, one
external adjustable oscillator, one pulse comparator, one time overflow controller, and
one output control circuit.
The differential amplifiers can operate ranging from -0.2V to VCC-0.2V. The time
overflow controller has a fixed offset to ensure the stable output in case of external
input changes. The external oscillator circuit can be set through Rt and Ct. In this
design, Rt is set to 10k and Ct is set to 1000p, and the operating frequency is calculated
as 100 kHz. The functional block diagram of TL494CN is shown Figure 1-16.
Figure 1-16 Functional block diagram of TL494
III. Power Supply Charging/Discharging Module
The battery charging and discharging module implements its function under the control
of the QSC6020 of the TCPU board.
Discharging function: When external power supply is unavailable, the QSC6020
controls the PM to turn on the battery switch and the battery starts to provide power
supply.
Charging function: When an external power supply is detected, the QSC6020 controls
PM whether to charge the battery or not.
Table 1-7 lists the interface signals between the battery charging/discharging module
and other modules.
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ETS1201 Fixed Wireless Terminal Maintenance Manual
Table 1-7 Description of signals of the battery charging/discharging module
Signal name
Source or destination module
Function description
VREG_PHO
NE
Secondary power supply
conversion module
Secondary power supply
output 4.44V
V_BATT
Battery
Battery output voltage
CHG_EN
QSC6020
QSC6020 output control
The circuit of the battery charging/discharging module is Shown as Figure 1-17. The
charging of batteries is controlled by varying the output current of the secondary power
supply. When the battery is charged in the quick mode, the grid of Q503 is low and
without continuity. In this case, the internal differential amplifier of 494 controls the
pulse duty ratio of PWM and maintains the output current of the switching power supply
in 830mA. When the battery is charged in the slow mode, the grid of Q503 is high and it
is turned on. The internal differential amplifier of 494 controls the pulse duty ratio of
PWM and maintains the output current of the switching power supply in 55mA. Then
the quick charging is stopped and the trickle charging starts. This feedback loop is
realized by the operation amplifier 2 of TL494.
Figure 1-17 Charging circuit
Because the battery in the circuit is directly connected with the 4.4V output of the
secondary power supply, when the external power supply is not connected, the battery
provides power supply for the system through the VREG_PHONE signal. So there is no
special discharge control circuit.
IV. Secondary Power Supply Voltage-limiting Module
The secondary power supply voltage-limiting module limits the voltage of the
secondary power supply to not exceeding 4.4V. After the constant current charging
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ETS1201 Fixed Wireless Terminal Maintenance Manual
ends, the module stabilizes the secondary power supply output to 4.4V to provide
power supply for the back circuit. This feedback loop is realized by the operation
amplifier 1 of TL494. The circuit is shown in Figure 1-18.
Figure 1-18 Secondary power supply voltage-limiting module
V. Power-on/Power-off Module
The S501 implements the power-on and power-off function. When the switch is set to
ON, the TERM_ON generates the low-level switching on pulse and the SWITCH_ON
generates the high-level switching on indication signal. The circuit is shown in Figure
1-19.
Power Switch
Figure 1-19 Switching ON/OFF module
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ETS1201 Fixed Wireless Terminal Maintenance Manual
1.3.3 QSC6020 Subsystem
The QSC6020 subsystem includes the voice coding/decoding unit, baseband signal
processing unit, and the CPU system running for protocol software. All these functional
units are integrated in the QSC6020 chip. The voice coding/decoding unit mainly
implements the compression and coding of the 64K voice digital streams, for example
EVRC codes, to make them suitable for the transmission in the wireless environment.
The baseband signal processing unit mainly includes the baseband
modulation/demodulation and channel coding/decoding functions. The subsystem also
includes the FLASH for software storage and SRAM for software operation.
1.3.4 RF Subsystem
For ETS1201 FWT the frequency is 800MHz. Though the frequency bands are different,
the structures of the boards are completely the same.
Each unit of the FWT RF subsystem of ETS1201 is described below in detail.
I. Receive Unit
Functions of the receive unit: After the outband spurious of the RF signals received by
the antenna of FWT is filtered by duplexer module, the signals are amplified by the RF
low noise amplifier and filtered by the RF SAW and then are sent to the down-convert
frequency mixer for frequency mixing. Because the RFR adopts the “zero intermediate
frequency” structure, it can directly convert RF signals to baseband signals, and then
implement I and Q demodulation, filter amplification, and ADC processing. The output
digital baseband signals are then sent to the baseband processing circuit.
The block diagram of the receive unit is shown in Figure 1-200.
Figure 1-20 RF receive unit
II. Transmit Unit
The main function of the transmit unit is as follows: The transmit modulation module
RFT directly amplifies the DA-converted analog I/Q signals and send to QSC6020. The
RF signals are obtained after RF frequency mixing and RF filter frequency change.
Then the RF signals are amplified by the RF power amplifier to the RF transmit signals
with set output power. Finally, the outband spurious of the RF signals of FWT is filtered
by duplexer module and the signals are then sent to the antenna. Another function of
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the duplexer module is to avoid the interference of transmission signals in the receiver.
The block diagram of the transmit unit is as shown in Figure 1-211.
Figure 1-21 RF transmit unit
III. RF Frequency Synthesizer
The main function of the RF frequency synthesizer is to provide RF local oscillator
signals for the transceiver. The duplexer interval of the RF is 45 MHz. So in the design,
transmit and receive share the RF local oscillator. For both transmit and receive, the RF
local oscillator is the high local oscillator. The signal frequency of the reference clock of
the RF synthesizer is 19.2 MHz and the phase discrimination frequency is 25 kHz. The
Rx PLL circuit is integrated in RFT, but the RX VCO and RX LO are still integrated in
RFR. The block diagram of the RF synthesizer is shown in Figure 1-222.
Figure 1-22 PLL circuit
The RX-QP, RX-QM, RX-IM, and RX-IP are the outputs of the four baseband signals of
RFR. The outputs are sent to MSM for processing. The SBST, SBCK, and SBDT are
three control buses. The MSM controls the RFR by controlling these three signals. The
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ETS1201 Fixed Wireless Terminal Maintenance Manual
TCXO signal provides the reference clock signal for all internal components. Three
kinds of power supplies provide power for RFR: The VREG-RFRX provides voltage for
PM, VREG-TCXO provides voltage for the clock of RFR, and VREG-MSMP provides
voltage for the internal components of RFR. The RF local oscillator signals provide the
local oscillator signals needed by receive or transmit channels for RF down conversion
or up conversion. Receive and transmit share one RF local oscillator signal.
1.4 Parameter Index
1.4.1 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
1.4.2 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
1.4.3 PLL indices:
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
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RF local oscillation signals Indices：
（1）Output frequency:
1664～1788MHz；
（2）Output power:
-12dBm
1.4.4 Electric Indices
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Chapter 2 Guide to FWT Assembly/Disassembly
The mechanical part of the FWT is composed of the front shell, bottom shell, and PCB,
as shown in Figure 2-1. This chapter describes the assembly and disassembly of main
body of the FWT (including upper/lower shell, internal cable, and boards).
(1) FWT front shell
(2) Fax board
(3) PCB
(4) FWT bottom
shell
(5) Battery
(6) Battery
cover
Figure 2-1 Mechanical parts of FWT
2.1 Assembly of FWT
To assemble a FWT, perform the following (assume that all boards and cables are
separate. If you are familiar with the FWT, you can install in different sequence):
I. Install RF feeder
At the TNC head, turn the RF feeder down, and push towards the hole of the TNC
header at the right upper corner of the bottom shell, and then fix through a screw.
II. Fix TUTU board
As shown in the figure, place the TUTU board on the corresponding position, and fix
with four ST2.9*6.5 tapping screws.
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ETS1201 Fixed Wireless Terminal Maintenance Manual
Figure 2-2 Installing the board
III. Install the front shell
As shown in the figure below, align the upper and lower shells, and fix with four
ST2.9*9.5 tapping screws.
Figure 2-3 Installing the upper shell
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ETS1201 Fixed Wireless Terminal Maintenance Manual
2.2 Disassembly of FWT
1)
In the disassembly of FWT, if the FWT has the battery and UIM card, pick them out
first. The sequence is the reverse of that in the assembly.
2)
Remove the screws of the shell, and open the front shell.
3)
Remove the antenna, and pick out the RF feeder under the bottom shell.
4)
Remove the screws of TUTU.
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ETS1201 Fixed Wireless Terminal Maintenance Manual
Chapter 3 Repair Process and Troubleshooting
3.1 Repair Process
3.1.1 Repair Process of Baseband Processing Interface Module Failure
I. Power failure
Power on
Yes
Can the voltage reach Pin 12 of
U501?
No
Check F501 and D501, and
clear faults
No
Check U501 and peripheral
circuits and clear faults
Yes
Is the voltage of the pins of L501
4.4V?
Yes
End
Figure 3-1 Repair process of power failure
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ETS1201 Fixed Wireless Terminal Maintenance Manual
II. Charging failure
Switch on the FWT and connect
to the power. Check whether the
charging starts
No
Check whether the battery container has the battery provided by Huawei
.
The battery is not fully charged.
No
Insert Huawei rechargeable battery.
The battery is not fully charged.
No
Check and replace the external
primary power
Yes
Refer to the repair method in
Case1
No
If the voltage of Pin1 is high,
replace Q503
Yes
Is the voltage of Pin2 of J501 about 12 V?
Yes
Refer to the repair of power failure in baseband fault case1, and
confirm whether the power is faulty
No
Check whether the voltage of Pin3 of
Q503 is low
Yes
End
Figure 3-2 Repair process of charging failure
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ETS1201 Fixed Wireless Terminal Maintenance Manual
3.1.2 Repair Process of RF Processing Module Failure
I. RF channel failure
Start CDMA operation mode
Yes
No
Check whether CDMA service and roaming
detection are normal
Check the CDMA receive channel
and clear faults
Yes
No
Check whether the CDMA call
establishment is normal
Yes
RF channel is normal
Figure 3-3 Repair process of RF channel failure
II. RF receive channel failure
3-3
Check the CDMA transmit channel
and clear faults
ETS1201 Fixed Wireless Terminal Maintenance Manual
RF receive channel is faulty
Yes
No
Is the output of duplex
normal?
Check
of Pin1
end of
of the input
power Voltage
theOutput
Check
ofPin
U7202,
and clear
the the
and clear
5 of U101,
peripheral circuit faults
peripheral circuit faults
Yes
No
Is the acoustic output normal?
output of
the input
Checkinput
Check
and and
output
of Z401. Clear
Pins 1, 3, and
Pin1,3,and
4 of4 Z7202.Clear
the
circuits
peripheral circuits
faultsofofperipheral
thefaults
Yes
No
RFR6122 normal?
IsIsthetheQSC6020
normal?
Yes
RF receive channel is normal
Figure 3-4 Repair process of RF receive channel failure
3-4
Checkthe
Input
outputofof
and output
input and
Check
RFR
and clear
faults
faults
and clear
RFR6122
ETS1201 Fixed Wireless Terminal Maintenance Manual
III. RF transmit channel failure
RF transmit channel is faulty
Yes
theoutput
RF output
Pin 23 ofofFRT6122
normal?
IsIsRF
pin of
M22,L22
QSC6020
normal?
Checkthe
thepower
power of
of RFT6122,
Check
QSC6020
TCXO,
and transmittransmit
AGC voltage,
RFTX,TCXO,and
and clear
AGC voltage,
andfaults
clear faults
No
Yes
Is the output of U201 RF surface acoustic filter
No
Check
input
and
output
of Pin 1
Checkthe
input
Pin
3and
4, and
output
Z7201,
andpin
3 of1of
U201,
andand
clearclear
peripheral
faults faults
peripheral
No
Check
input
and
outputPin
of Pin
Checkthe
input
and
output
3 4
of U202, and clear
and and
7 of8U7201,clear
peripheral
peripheral
faults faults
No
Check
input
and
outputPin
of 3Pin 5
Check the
input
and
output
and 6
of 8U7202,
and
clear
and
of U101,
and
clear
peripheral
faults. faults
peripheral
Is the output of RF surface acoustic filter normal?
normal?
QSC6020 normal?
Yes
IsIs the
of of
U202
power
amplifiernormal?
normal?
theoutput
output
RF RF
power
amplifier
Yes
theoutput
output
duplex
normal?
IsIsthe
of of
U101
duplex
normal?
Yes
RF transmit channel is normal
Figure 3-5 Repair process of RF transmit channel failure
3.2 Troubleshooting
This section describes fault symptoms and troubleshooting.
I. The terminal is not connected to an external power adapter. The switch of
the FWT is turned on, but the battery LED is still off.
Open the battery container to check whether the battery has been installed.
If the battery has been installed, the problem is likely resulted from inadequate power
supply of the battery. In this case, you should connect the terminal with the external
power adapter.
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ETS1201 Fixed Wireless Terminal Maintenance Manual
II. Connect the power adapter to the terminal, turn on the FWT, but the power
LED keeps off.
Check the input of the power supply and ensure that the mains is normal and the power
connection board is in the good contact.
Check the output of the power supply and ensure that the output of the power voltage is
normal.
Ensure that switch is ON. Turn it off for one minute, and then turn it on and check the
system.
III. Turn on the switch of the FWT, the power LED is in normal status, but all
the signal intensity LEDs keep off.
Check whether the antenna is correctly installed.
If an outdoor antenna is used, try to place the antenna at a higher place, or change the
antenna direction (only necessary for directional antenna).
IV. The signal intensity LED is in normal status, but no dial tone sounds after
off hook.
Please refer to section 4.1.5 to check the connection between the telephone set and
the FWT.
V. The voice is unstable and discontinuous.
Observe the number of the lit signal LEDs. If it lowers than 2, it means that the network
signal on this position is poor. Please try to use outdoors antenna or move the FWT to a
position with stronger signal. The strong signal intensity may be led by strong
environmental interference, please consult the carrier.
VI. Facsimile receive abnormal
Configure the FWT to “facsimile receive mode”.
VII. Call answering abnormal
You cannot answer a call if the FWT is in “facsimile receive mode”.
VIII. Facsimile sending failure (pressing the sending key after hearing the
sound of “beep”)
It may be caused by the following reasons:
1)
Poor network signal quality.
2)
You have dialed a wrong fax number.
3)
The called party has configured manually receiving mode but not started
receiving.
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ETS1201 Fixed Wireless Terminal Maintenance Manual
IX. The FWT can make a call normally. After the serial port is connected to the
background, it cannot communicate with the background
Confirm the connection between the PC and FWT through the USB cable is correct.
Confirm whether the communication port is set to the USB port to be connected.
X. The fast charging of the FWT cannot stop
Use a multi-meter to measure whether the output voltage of the power adapter is
normal.
Switch off the FWT, open the battery cover the FWT, pick out the battery, and check
whether the voltage of the battery is normal and whether the leakage exists.
If the power of battery is faulty, replace the faulty component. If there is no problem,
re-load the software code.
XI. The battery is empty after the short-time usage
Check whether the battery is used for multiple times. If yes, the battery capacity
decreases obviously. In this case, replace the battery.
Check whether the output voltage of the power adapter is normal. If the power is faulty,
replace the faulty component.
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ETS1201Fixed Wireless Terminal Maintenance Manual
Chapter 4 List of Damageable Spare Parts
03020HHL
TT601-450AS,WL22TUTU,Terminal Interface Process Unit For Fixed Wireless Terminal,
Customized for BSNL,IN,1*2
02130642
Primary power supply --5degC-45degC-190V-300V-(12V+/-5%)/0.5A-European linear
power
24020326
Storage battery -NiMH battery-3.6V-1.5Ah-Battery group -53*46*15.5mm
27010056
Omni antenna -824-894MHz-2.15 dBi-vertical-Omni direction
-50W-0r-TNC/MALE-Without support
7050057
PTC,0.29ohm,750mA,PTC,THT,11.0*16.5*3.1mm,Terminal Dedicated
14140096
Board base-SIM base-6PIN-Level-2.54mm-without locker –without location -0mm-SMT
04050038
Made Wire,RF Cable,0.15m,TNC50SF-I,RG316-50-1.5/0.5BR-I,For Terminal
15060178
MOSFET N MOSFET,55V,2A,0.14ohm,13V,SOT-223, RoHS Terminal Dedicated
15060153
MOSFET,N-Channel,20V,0.7A,0.53ohm,6V,SC-75,Mobile Dedicated,ESD Protected
Gate
07040002
Varistor,27V,500A
15050189
PNP Transistor ,140V,5000mA,3000mW,0.16V,SOT223,100S,Mobile Dedicated
09040306
Switch Power Transformer 40:8:8:8+/-1%
(6-10):(1-2):(2-3):(3-4)-0.107mH-+/-10%-0.24ohm-TDK
PC40EF12.6-Z-17.6*13.5*10.5,Designed for use with Si3210M
14200030
Socket,Square Hole,16PIN,Double Row Straight,Hole Spacing 2.54mm,Plastic Body
Height 8.51mm/Pin Tail Length 2.54mm,THT
16060015
Slide Switch,DPDT,30VDC,0.3A,PCB THT,4.3mm,ON-ON,14*6.5*11,Side,Handle length
8mm,Terminal Dedicated
39110327
Control Chip, PWM Controller,SO16,Mobile Dedicated
51660656
DKBA4.140.1486MX,Plastic Cover(1500 mAh),ETS1000
13080016
Duplexer-824~849MHz(TX),869~894MHz(RX),1.7-2.1-54-Terminal
Dedicated-3.0mm*2.5mm
13010155
SAW Filter,836.5,2.3dB,1.4*1.1mm,Terminal Dedicated
47100136
Power Module,824~ 849MHz,27dB(High Gain)/17dB(Low Gain),M9 3*3mm
39200061
Terminal Dedicated IC,CDMA2000 1X Digital Processor
QSC6020,3.0/3.6/4.2/5.0V,BGA351(Pb-Free),Terminal Dedicated
40060149
FLASH,64MbitFlash+16MbitPsaram,54MHz,64KB,1.8V,BGA88(Pb-Free),AD
MUX,Terminal Dedicated
12020140
Crystal,19.2MHz,7pF,+/-10ppm,70ohm,3.2*2.5*0.6mm,Terminal Dedicated
12020123
Crystal resonator-0.032768MHz-12.5pF-20ppm-65000ohm-SX4-For Handset only
13010097
SAW FILTER,881.5MHz,2.2dB,100V,SMT-5PIN,Mobile Dedicated
4-1