故障诊断试题及评分WSC2013_TP16_SG_actual_EN教程方案.docx

WSC2013_TP16_SG_actual_EN? WorldSkills International (WSI) reserves all rights in documents developed for or on behalf of WSI, including translation and electronic distribution. This material may be reproduced for non-commercial vocational and educational purposes provided that the WorldSkills International logo and copyright notice are left in place.Page  PAGE \* Arabic \* MERGEFORMAT 1 of  NUMPAGES \* Arabic \* MERGEFORMAT 29 Test Project for Skill 16 WSC2013_TP16_SG_actual_ENVersion: 1.0Date: 08.07.13Page  PAGE \* Arabic \* MERGEFORMAT 29 of  NUMPAGES \* Arabic \* MERGEFORMAT 29 Test Project Document WSC2013_TP16_SG_actual_EN 故障诊断、维修、测量试题 Fault Finding, Repair and Measurement Submitted by: Name: Kum-Cheong Leong Member 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.pdf Test Project Document 试题文件 WSC2013_TP16_SG_SCH.pdf Fault Finding Schematics (3 sheets) 故障诊断示意图（3张） WSC2013_TP16_SG_CMP.pdf Fault Finding Component Layout 故障诊断零件布置图 WSC2013_TP16_SG_PCB.pdf Fault Finding PCB Design 故障诊断PCB设计 Datasheet Document PDF 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 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 Frequency (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 Suppressed Carrier (DSBSC) signal to form the Stereo Multiplex (MPX), Fig 1. A 19kHz signal is added to the MPX as a Pilot Ton