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Elements and Performance Criteria

1. Prepare to diagnose and rectify faults
   • Work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures are identified and applied.
2. Hazards are identified, risks are assessed and control measures implemented
3. Safety hazards not previously identified are reported on job safety assessment and advice on risk control measures is sought from relevant person/s
4. Extent of work is determined from reports, other documentation and discussions with appropriate person/s
5. Appropriate person/s are consulted to ensure work is coordinated effectively with others
6. Tools, equipment and testing devices required for diagnosing faults are obtained in accordance with workplace procedures and checked for correct operation and safety
7. Diagnose and rectify faults
   • WHS/OHS risk control measures and procedures for carrying out the work are followed
8. Need to test or measure live electrical components is determined in accordance with workplace procedures
9. Circuits/machines/plant are checked and isolated in accordance with workplace procedures
10. Logical diagnostic methods are applied to diagnose electronic control system apparatus faults by employing measurements and estimations of system operating parameters
11. Scenarios are tested as suspected cause of system faults
12. Fault causes are identified and relevant person/s engaged where fault is outside scope of digital subsystems
13. Faults in electronic components of control system are rectified
14. System is tested and verified as operating to specified job requirements
15. Unplanned situations are responded to in accordance with workplace procedures in a manner that minimises risk to personnel and equipment
16. Methods for dealing with unplanned situations are selected based on safety and specified work outcomes
17. Diagnosis and rectification work activities are performed using sustainable energy principles and practices without wasting materials, damaging apparatus, the surrounding environment or services
18. Complete and report fault diagnosis and rectification activities
    • WHS/OHS work completion risk control measures and workplace procedures are followed
19. Worksite is made safe in accordance with workplace safety procedures
20. Rectification of faults is documented in accordance with workplace procedures
21. Relevant person/s is notified of system fault rectification in accordance with workplace procedures

Range Statement

Range is restricted to essential operating conditions and any other variables essential to the work environment. Non-essential conditions may be found in the UEE Electrotechnology Training Package Companion Volume Implementation Guide.
Diagnosing and rectifying faults in digital control systems must include at least four of the following faults:	open circuit short circuit incorrect or failed connections insulation failure unsafe condition apparatus/component failure related mechanical failure

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Performance Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions on at least two separate occasions and include:

applying logical diagnostic methods applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements, including implementing risk control measures applying sustainable energy principles and practices completing and reporting fault diagnosis and rectification activities dealing with unplanned events/situations in accordance with workplace procedures in a manner that minimises risk to personnel and equipment diagnosing and rectifying faults documenting fault rectification identifying faults, causes and rectification methods isolating circuits/machines/plant obtaining tools, equipment and testing devices preparing to diagnose and rectify faults rectifying faults in digital subsystems testing and measuring live electrical components using scenarios to test causes of system faults verifying system operates as intended.

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Knowledge Evidence

Evidence required to demonstrate competence in this unit must be relevant to and satisfy all of the requirements of the elements, performance criteria and range of conditions and include knowledge of:

digital control systems, including: comparison between analogue and digital signals advantages of digital control systems digital/analogue control system logic gates truth tables digital testing devices numbering systems, including: the binary number system the octal number system the hexadecimal number system binary addition and subtraction conversion between numbering systems binary coded decimal (BCD) Gray code the American Standard Code for Information Interchange (ASCII) combinational logic networks, including: precautions when handling electronic devices due to electrostatic discharge (ESD) truth tables basic operation and characteristics of logic devices logic probes verification of operation of logic circuits logic families and specifications, including: logic families and specifications transistor-transistor logic (TTL) complementary metal oxide silicone (CMOS) logic families the unit load concept specifications and features of TTL, TTL low power Schottky (LS) and CMOS logic families three state and open collector logic input and output voltage characteristics for CMOS and TTL comparison of TTL with CMOS logic families unit load noise margin interfacing different logic families tri-state logic devices encoders and decoders, including: weighted and unweighted codes Gray BCD ASCII half and full adder error detection decoder and encoder integrated circuits multiplexer and demultiplexer integrated circuits flipflops, including: RS flipflops D flipflops JK flipflops truth tables and operation debouncing a switch timing diagrams sequential logic state tables and timing diagrams registers, including shift registers and data latches counters, including: ripple counters using JK flipflops typical integrated circuit types characteristics and operation ripple counters use of feedback to modify count circuit verification of a ripple counter synchronous counters series and parallel data transfer multivibrators interconnecting digital circuits to perform an application digital-to-analogue (D/A) conversion, including: industrial applications of D/A converters summing D/A converters R-2R D/A converters verification of circuit operation of an IC D/A converter analogue-to-digital (A/D) conversion, including: industrial applications of A/D converters digital ramp, dual slope, successive approximation and simultaneous (flash) A/D converters verification of circuit operation of an IC A/D converters display devices, including: liquid-crystal display (LCD) devices light-emitting diode (LED) devices. operation and characteristics seven segment LED displays drive requirements current limiting multiplexed displays seven segment encoding chips emerging display technologies digital fault finding, including: general fault-finding principles common digital faults digital test equipment locating a fault interfacing logic devices to external loads, including: interfacing with a transistor interfacing with a relay solid state switches opto-isolator verification of circuit operation of an opto-coupler programmable logic devices, including: programmable logic devices applications of programmable logic devices types of programmable logic devices comparison between different programmable logic devices programmable array logic (PAL) programmable logic devices (PLD) field programmable gate arrays (FPGA) programming and verifying correct operation of a programmable array logic device relevant job safety assessments or risk mitigation processes, including risk control measures relevant manufacturer specifications relevant WHS/OHS legislated requirements relevant workplace documentation relevant workplace policies and procedures sustainable energy principles and practices system testing and verification techniques diagnostic methods including digital fault finding, including: diagnostic tools, equipment and testing devices digital control systems, including comparison between analogue and digital signals numbering systems, including binary number system, octal number system and hexadecimal number system.

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