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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 i 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. 1-1 ETS1201 Fixed Wireless Terminal Maintenance Manual 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 1-2 ETS1201 Fixed Wireless Terminal Maintenance Manual 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. 1-3 ETS1201 Fixed Wireless Terminal Maintenance Manual 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. 1-4 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. 1-5 ETS1201 Fixed Wireless Terminal Maintenance Manual 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 1-6 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. 1-7 ETS1201 Fixed Wireless Terminal Maintenance Manual 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 1-8 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. 1-9 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 1-10 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: 1-11 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 1-12 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. 1-13 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 1-14 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 1-15 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. 1-16 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 1-17 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 1-18 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 1-19 ETS1201 Fixed Wireless Terminal Maintenance Manual 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 1-20 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 1-21 ETS1201 Fixed Wireless Terminal Maintenance Manual RF local oscillation signals Indices: (1)Output frequency: 1664~1788MHz; (2)Output power: -12dBm 1.4.4 Electric Indices 1-22 ETS1201 Fixed Wireless Terminal Maintenance Manual 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. 2-1 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 2-2 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. 2-3 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 3-1 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 3-2 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. 3-5 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. 3-6 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. 3-7 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