8) This describes the essential skills and knowledge and their level, required for this unit. Evidence shall show that knowledge has been acquired of safe working practices and diagnosing and rectifying faults in display circuits. All knowledge and skills detailed in this unit should be contextualised to current industry practices and technologies. KS01-EH176A Electronic displays faults Evidence shall show an understanding of electronic displays faults, applying safe working practices and relevant Standards, Codes and Regulations to an extent indicated by the following aspects: T1. Cathode ray tube displays encompassing: Operation and characteristics of various types of cathode-ray tubes including delta, in-line and precision in-line Voltages, statics and x-rays around CRTs Set up and adjustment techniques Rear and front projection TV systems Typical faults T2. Plasma displays and their circuit control operation encompassing: Advantages of flat panel displays (over conventional CRT’s, Raster geometry etc) Theory of plasma gas discharge and phosphor excitation Scanning techniques (column/row addressing Luminance/colour aspects (the need to re-address pixels to control light output Gamma correction considerations. (reversal of the gamma correction that is carried out at the TV studio to compensate for the non-linearity of light output of a conventional CRT) Plasma flat panel construction (and handling) T3. Liquid crystal displays and the control circuit operation encompassing: Principles of transmissive LCD displays (as opposed to reflective types) Light polarisation. (polarisation twisting characteristics of liquid crystal and the need for polarisation filters in display panel) Voltage/current requirements and need for electric field Fluorescent back light (need for high frequency operation and power requirements) Scanning techniques (colour/row addressing and thin film transistors) Light attenuation (caused by the many layers/filters the back light has to pass through) Construction and handling T4. Display circuit diagnostics encompassing: Sub-system components (i.e. functional blocks) and their operating parameters Factors effecting system performance Typical faults, their symptoms and cause. Fault diagnosis procedures and testing Sub-system adjustments T5. Advance electronic measuring instruments encompassing: Test/measuring devices and their application - Examples are frequency counters, and synthesisers, spectrum analysers, noise and distortion meters and RF communications service monitor. T6 Connection of test/measuring devices into a circuit encompassing: safety procedures loading and matching storage and delay circuit arrangement of test/measuring devices T7 Taking and interpreting readings T8 Notion of decibels including dBm, dBr, dBu, dBo T9. OHS enterprise responsibilities encompassing: Provisions of relevant health and safety legislation Principles and practice of effective occupational health and safety management Management arrangements relating to regulatory compliance Enterprise hazards and risks, control measures and relevant expertise required Characteristics and composition of workforce and their impact on occupational health and safety management Relevance of enterprise management systems to occupational health and safety management Analysis of working environment and design of appropriate occupational health and safety management systems Analysis of relevant data and evaluation of occupational health and safety system effectiveness Assess resources to establish and maintain occupational health and safety management systems. |