故障诊断试题及评分WSC2013_TP16_SG_actual_EN

1、Test Project DocumentWSC2013_TP16_SG_actual_EN 故障诊断、维修、测量试题Fault Finding, Repair and MeasurementSubmitted by:Name: Kum-Cheong LeongMember Country: Singapore 新加坡Contents 目录The following are the documentation for this Test Project: 此试题文件包含：WSC2013_TP16_SG_FFM.pdfTest Project Document 试题文件WSC2013_TP16_

2、SG_SCH.pdfFault Finding Schematics (3 sheets) 故障诊断示意图（3张）WSC2013_TP16_SG_CMP.pdfFault Finding Component Layout 故障诊断零件布置图WSC2013_TP16_SG_PCB.pdfFault Finding PCB Design 故障诊断PCB设计Datasheet DocumentPDF Data Files PDF数据文件Introduction简介This test project is a FM Stereo Test Transmitter. 此试题是调频立体声测试发射机。 It

3、 generates the necessary signals to test FM Stereo Receivers and Stereo Decoders. 它可以生成必要的信号以测试调频立体声接收器和立体声解码器。Fig. 1: Audio Signals, Sub-Carrier and Multiplexed (MPX) Signals图1：音频信号、副载波和MPX信号Instead of using special purpose ICs to produce the waveforms this design uses ordinary HCMOS logic. Audio F

4、requency (AF) signals are produced using binary counters and combinational logic and then filtered to obtain two very low distortion sine waves to serve as the test tones. These audio signals are then multiplexed by a 38kHz Sub-Carrier to form a Left+Right and a Left-Right Double Side-Band Suppresse

5、d Carrier (DSBSC) signal to form the Stereo Multiplex (MPX), Fig 1. A 19kHz signal is added to the MPX as a Pilot Tone. This can be used to test FM stereo decoders or FM modulated for testing FM stereo receivers.而非采用特别目的的ICs来生成这种波形图，此设计是使用普通的HCMOS逻辑。音频频率信号是通过二进制计数器和组合逻辑生成的，然后滤波后得到两条低失真正弦波，以便用作测试音。这些

6、音频信号之后会通过38kHz副载波多路传输，形成一个左+右和 左-右 双边带抑制载波信号，然后形成立体MPX。图1 A 19kHz 信号是增加作为MPX导频音的。这样可以用于测试FM立体声解码器或调频波形（测试 FM立体声接收器）。The frequency modulation (FM) oscillator is free running at 65MHz (reduced from 88108MHz due to bandwidth limitation of the supplied oscilloscope) and can be finely adjusted over + 300

7、kHz with the variable capacitor.FM振荡器可以以 65MHz (由于示波器的带宽限制，从原来的88108MHz下降到 65MHz） 正常运行，并可以通过变容器调整至+ 300kHz 。Description of the Project 项目描述The block diagram of the FM Stereo Test Transmitter is shown in Fig. 2. 图2是FM立体音测试发射器的方块图：Manual/Auto Clock手动、自动时钟Control Logic 控制逻辑Multiplexer &Summer MPX和加法器FM

8、 Modulator FM调制器FM Modulated Output FM调制输出MPX Output MPX输出Signal Generator 信号发生器音频Audio 19kHz 38kHzFig. 2: Block Diagram of FM Stereo Test Transmitter图2：FM立体音测试仪方块图The Signal Generator generates the 38kHz sub-carrier and 19kHz pilot tone. It uses an ingenious technique to generate 2 sine waves (audi

9、o) with very low distortion at around 300Hz and 1.2kHz after being filtered with what is effectively a 3-pole Sallen-Key Low-Pass Filter. Before filtering the digital waveform has a fourier series as follows:信号发生器发出38kHz副载波和19kHz导频音。采用独创技术发出2条低失真正弦波（音频），通过一个 3极Sallen-Key 低通滤波器过滤后频率约为300Hz 和1.2kHz。滤波

10、前电子波形图的傅里叶级数如下：The 38kHz sub-carrier is used to multiplex the audio signals and then summed with the 19kHz pilot by the Multiplexer & Summer to form 16 different waveforms (Fig 3). The audio signals being encoded as Left or Right is based on the phase of the sub-carrier.38kHz副载波用于多路传输音频信号，然后通过MPX和加法

11、器与19kHz导频音联合，形成16种不同的波形（表3），音频信号根据副载波的相位编码为左或右。The 16 different waveforms are: 16种不同的波形：300Hz Mono Audio Only 仅300Hz单声道音频300Hz Left Only MPX, No 19kHz Pilot300Hz左 MPX，无19kHz 导频音1.2kHz Mono Audio Only 仅1.2kHz单声道音频300Hz Left Only MPX, with 19kHz Pilot300Hz左 MPX，与19kHz 导频音300Hz + 1.2kHz Mono Audio Only

12、 仅300Hz+ 1.2kHz单声道音频300Hz Right Only MPX, No 19kHz Pilot300Hz右 MPX，无19kHz 导频音19kHz Pilot Only 仅19kHz 导频音300Hz Right Only MPX, with 19kHz Pilot300Hz右 MPX，与19kHz 导频音300Hz Left左/1.2kHz Right 右MPX, No 19kHz Pilot 无19kHz 导频音1.2kHz Left Only MPX, No 19kHz Pilot11.2kHz左 MPX，无19kHz 导频音300Hz Left左/1.2kHz Rig

13、ht右 MPX, with 19kHz Pilot 与19kHz 导频音1.2kHz Left Only MPX, with 19kHz Pilot1.2kHz左 MPX，与19kHz 导频音300Hz Right/1.2kHz Left MPX, No 19kHz Pilot无19kHz 导频音1.2kHz Right Only MPX, No 19kHz Pilot1.2kHz右 MPX，无19kHz 导频音300Hz Right/1.2kHz Left MPX, with19kHz Pilot与19kHz 导频音1.2kHz Right Only MPX, with 19kHz Pilo

14、t1.2kHz右 MPX，与19kHz 导频音Fig 3: Multiplexer and Summer Outputs 表3：MPX和加法器输出The following are 2 waveforms that can be expected: 下列是2种波形图：Fig 4: 300Hz Right/1.2kHz Left MPX, No 19kHz Pilot 图 4: 300Hz 右/1.2kHz 左 MPX, 无19kHz 导频音 U12: QA=0, QB=0, QC=0, QD=0Fig 5: 300Hz Right/1.2kHz Left MPX, with 19kHz Pil

15、ot图 5: 300Hz 右/1.2kHz 左 MPX, 与19kHz 导频音 U12: QA=1, QB=0, QC=0, QD=0The control signals from the Control Logic controls the switching and summing and therefore the output waveforms of the Multiplexer & Summer. 控制逻辑的控制信号决定转换和合并以及MPX和加法器的输出波形。The state of the Control Logic is advanced by the Manual/Aut

16、o Clock. In manual mode the advancing is done by a Push Button via a de-bouncing circuit. In Auto mode it is advanced every 3 seconds.控制逻辑的状态由手动或自动时钟控制。手动模式时由按钮通过防跳动电路控制。自动模式时 每3秒有改变。 Jumper J1 is the power connection to the FM Modulator. Put the jumper to the OFF position when not working on that s

17、ection of the circuit.跳线J1将电源连接到FM调制器。当那部分的电路暂停时，将跳线放在OFF位置上。Jumper J2 selects the mode of advancing the state of the Control Logic, Manual or Auto.跳线J2用于选择控制逻辑的控制模式，手动或自动。Jumper J3 directs the MPX signal to the FM Modulator (To Mod) or to H2 (To H2).跳线J3引导MPX信号至FM调制器 (To Mod) 或者 H2 (To H2).Instruct

18、ions to the Competitor 参赛者指导Fault Finding and Repair 故障诊断和维修You will have to locate and repair 6 faults in the test project. 参赛者将找出并维修试题中的6处故障。Supply voltage of 5.0 + 0.1 volts to be applied to terminal H1, please take note of the polarity.终端H1的电源电压为5.0 + 0.1V，请记下极性。Adjust VR1 to set the frequency o

19、f the clock output at U1 Pin 3.通过调整VR1，设置U1针3的时钟输出频率。Adjust VR2 for maximum MPX output at H2.调整VR2，设置H2的最大MPX 输出。Adjust VR101 to set the period of the clock at U101 Pin 3 to 3.0 + 0.05 seconds.通过调整VR101，设置U101针3的时钟段为3.0 + 0.05 秒。When a fault is located, complete the table in the answer script (Page

20、11) with the components designator and the fault symbol. The fault symbol should be from the Fault Symbol Table (Fig 6). 找出故障后，填写第11页的记录卡，填写元件标识符和故障符号。故障符号应使用表6中的。If the fault requires a component change, please request a component from the experts. Indicate the component requested in the Parts List

21、 and must be signed by both Competitor and Expert.如果故障需要改变零件，请联系专家申请一个零件，填写在零件清单中，必须由参赛者和专家签字。Youll need to show evidence of locating and repairing the fault by measuring and recoding up to 2 measurements prior to and after repairing the fault.需要呈交故障诊断和维修时测量和记录的凭证（至少2种，维修前和维修后）。Fault Symbols: 故障符号：F

22、ault Symbol故障符号Description描述Fault Symbol故障符号Description描述Open 开(part, wire or PCB trace元件、线或PCB线路)Stuck at high voltage (pin, input, output, etc)电压高障碍（针、输入、输出等）Short 短路(part, wire or PCB trace元件、线或PCB线路)Stuck at low voltage (pin, input, output, etc)电压低障碍（针、输入、输出等）Part with larger value (resistor, ca

23、pacitor, etc)测量值太大（电阻器、电容器等）?Incorrect part number or wiring connecting 零件编号或接线错误Part with smaller value(resistor, capacitor, etc)测量值太小（电阻器、电容器等）+/-Wrong Polarity 极性错误Fig 6: Fault Symbol Table 表6：故障符号表Instructions to the Competitor (Contd) 参赛者指导Measurement测量Before proceeding to the measurement porti

24、on of the test project, ensure that all faulty components have been replaced. 在开始测量前确保所有故障元件都已经更换过。You are to work with conventional testing and measurement equipment.必须使用常规的测试和测量设备。You are to record and analyse the measured results.必须记录并分析测量结果。For each measurement, you must provide a schematic show

25、ing how you performed the measurement.必须提供每次测量的相应示意图，说明测量方法。Ensure that your recorded measurements have all the necessary labels, e.g. frequency, voltage, time, etc.确保记录的测量结果都有必要的标签如频率、电压、时间等。You can use the following equipment symbols and example for the measurement schematic:可以使用下列设备符号和示例标注测量示意图：E

26、quipment 设备Symbol 符号Power Supply 电源Voltmeter 电压表VAmmeter 电流表AOscilloscope 示波器Function Generator 函数发生器FGFig 7: Equipment Symbol Table 表7：设备符号表CH1CH2GNDVccTP1TP25VFig 7a: Example of Measurement Schematic 表7a：测量示例图Part List零件清单S/N序Description 品名Value 参数Designator 标识符Qty数量CompetitorRequest参赛者申请Competito

27、rSignature参赛者签名Expert Signature专家签名1Capacitor, Ceramic电容器，陶瓷150pC112Capacitor, Ceramic电容器，陶瓷100nC2, C4, C9, C13, C21, C30, C32, C102, C1039*3Capacitor, Polyester电容器，聚酯22nC314Capacitor, Ceramic电容器，陶瓷1nC5, C7, C33, C35, C3955Capacitor, Polyester电容器，聚酯4n7C616Capacitor, Ceramic电容器，陶瓷220pC817Capacitor,El

28、ectrolytic 电容器，电解47uC10, C1228Capacitor, Ceramic电容器，陶瓷68pC11, C3429Capacitor, Ceramic电容器，陶瓷330nC20110Capacitor, Tantalum电容器，钽2u2C22111Capacitor, Tantalum电容器，钽680nC23112Capacitor,Electrolytic电容器，电解220uC31113Capacitor, Ceramic电容器，陶瓷27pC36114Capacitor, Ceramic电容器，陶瓷100pC37115Capacitor, Variable222pC381

29、16Capacitor, Tantalum电容器，钽3u3C101117Diode, Variable Capacitance二极管，变频电容BB208-03D1, D2218Inductor, Wire Wound 电感器，绕线式InductorL1119LED, Red红, T1- LEDLED1120Resistor, Axial, W电阻器，轴向820RR0121Resistor, Axial, W电阻器，轴向13kR1122Resistor, Axial, W电阻器，轴向15kR2123Resistor, Axial, W电阻器，轴向390kR3, R101, R102324Resi

30、stor, Axial, W电阻器，轴向160kR4125Resistor, Axial, W电阻器，轴向1k8R5, R11226Resistor, Axial, W电阻器，轴向110kR6127Resistor, Axial, W电阻器，轴向43kR7128Resistor, Axial, W电阻器，轴向2k7R81*Decoupling Capacitors C41C56 not included in parts listS/N序Description 品名Value 参数Designator 标识符Qty数量CompetitorRequest参赛者申请CompetitorSignat

31、ure参赛者签名Expert Signature专家签名29Resistor, Axial, W电阻器，轴向91kR9130Resistor, Axial, W36kR10131Resistor, Axial, W560kR12132Resistor, Axial, W6k2R13133Resistor, Axial, W330kR14, R15234Resistor, Axial, W12kR16, R17, R20, R21, R22, R24635Resistor, Axial, W4k7R18, R35236Resistor, Axial, W7k5R19137Resistor, Ax

32、ial, W62kR23138Resistor, Axial, W22kR30, R32239Resistor, Axial, W1k2R31140Resistor, Axial, W33RR33141Resistor, Axial, W2k2R34142Resistor, Axial, W68RR36143Resistor, Axial, W470RR37144Resistor, Axial, W56RR38145Switch, Push Button开关，按钮SW-PBS1146Transistor, NPN, RF晶体管BF199T1147Timer IC计时器TLC555CPU1, U

33、11, U10134812-Bit Binary Counter 12位二进制计数器SN74HC4040NU2149Quad 2-Input Ex-OR Gate四2输入或门SN74HC86NU3, U4, U5350Precision Dual Op Amp 精密双运算放大器TLC277CPU6, U7251Quad Bilateral Analog Switch四路双向模拟开关SN74HC4066NU8152Quad 2-Input OR Gate四2输入或门SN74HC32NU9153Quad 2-Input AND Gate四2输入与门SN74HC08NU10, U162544-Bit

34、 Binary Counter4位二进制计数器74HC93NU12155Hex Inverter 六角逆变器SN74HC04NU13156Triple 3-Input OR Gate 三3输入或门CD74HC4075NU14, U15257Resistor Variable可变电阻器5kVR1, VR2258Resistor Variable可变电阻器100kVR1011Fig. 8: Schematics Sheet 1 图8：示意图Fig. 9: Schematics Sheet 2 图9：示意图Fig. 10: Schematics Sheet 3 图10：示意图Fig. 11: Com

35、ponent Layout Overlay 图11：元件封装Fig. 12: Top Layer 图12 顶层Fig. 13: Bottom Layer (Bottom View) 图13 底层Fault Finding & Repair Answer Script 故障诊断和维修 - 记录表Defective Part 故障；零件Fault Symbol故障符号Fault #1 故障一Before 之前After 之后Measurement#1测量一Node节点:_Measurement#2 测量二(Optional随机)Node:_Defective PartFault SymbolFau

36、lt #2故障二BeforeAfterMeasurement#1Node:_Measurement#2(Optional)Node:_Defective PartFault SymbolFault #3故障三BeforeAfterMeasurement#1Node:_Measurement#2(Optional)Node:_Defective PartFault SymbolFault #4故障四BeforeAfterMeasurement#1Node:_Measurement#2(Optional)Node:_Defective PartFault SymbolFault #5故障五BeforeAfterMeasurement#1Node:_Measurement#2(Optional)Node:_Defective PartFault SymbolFault #6故障六BeforeAfterMeasurement#1Node:_Measurement#2(Optional)Node:_Measu