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Elements and Performance Criteria

1. Prepare to find and repair faults in complex power supplies
   • Work health and safety (WHS)/occupational health and safety (OHS) requirements and workplace procedures for relevant work area are identified, obtained and applied
2. WHS/OHS risk control measures are applied in accordance with workplace procedures prior to commencing work
3. Nature of the fault is obtained from documentation or discussions with relevant person/s to determine scope of work
4. Relevant person/s is consulted to ensure the work is coordinated effectively with others
5. Materials required for the work are determined in accordance with workplace procedures
6. Tools, equipment and testing devices required for work are obtained in accordance with workplace procedures and checked for correct operation and safety
7. Find and repair faults
   • WHS/OHS risk control measures and procedures are applied
8. Need to test and measure live work is determined in accordance with WHS/OHS requirements and workplace procedures
9. Apparatus is isolated, as required, in accordance with WHS/OHS requirements and workplace procedures
10. Fault finding is approached methodically, applying principles of complex power supplies, analysing faults through reference to block and schematic diagrams and using measured and calculated values of power supply parameters
11. Apparatus components are dismantled, as necessary, and parts stored to protect against loss or damage
12. Faulty components are rechecked and their fault status confirmed
13. Materials required for repair work are sourced and obtained in accordance with workplace procedures
14. Effectiveness of the repair is tested in accordance with workplace procedures
15. Apparatus is reassembled, tested and prepared for return to customer
16. Unplanned situations are dealt with safely and with approval of relevant person/s
17. Fault-finding and repair activities are carried out efficiently without waste of materials, damage to apparatus, the surrounding environment or services applying sustainable energy practices
18. Complete and report repair activities
    • WHS/OHS risk control measures and workplace procedures are applied
19. Work area is cleaned and made safe in accordance with workplace procedures
20. Justification is made in the required format for repairs to apparatus
21. Work completion is documented in accordance with workplace procedures and relevant person/s notified

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.
Finding and repairing faults in complex power supplies must include at least the following:	fault finding two faults in each of the following types of power supply: linear regulated power supply switch mode power supply

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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 methodical fault-finding techniques applying relevant risk identification, assessment, reporting and control requirements applying relevant work health and safety (WHS)/occupational health and safety (OHS) requirements applying sustainable energy principles and practices coordinating work with relevant person/s dealing effectively with unplanned events determining live testing/measurement requirements determining scope of work efficiently finding faults finding and repairing faults in complex power supplies identifying and accessing materials, tools, apparatus and testing devices isolating circuits/machines/system providing justification for the repairs replacing components without damage selecting relevant test equipment and test methods making and analysing measurements to verify circuit operation.

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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:

complex power supplies fault finding and repair off-line switching regulators relevant manufacturer specifications relevant safe work method statements (SWMS)/job safety assessments or risk mitigation processes relevant standards, codes and regulations relevant WHS/OHS legislated requirements relevant workplace documentation relevant workplace policies and procedures relevant principles of switching regulation series regulation series regulator employing closed loop control switching regulation - closed loop control of output block and schematic diagrams for typical power supply circuits heatsink selection considerations circuit protection methods - crowbar and current-limiting verification of circuit operation fault-finding techniques electromagnetic radiation (EMR) considerations with switch mode supplies inductance and transformer theory diode and semiconductor basics rectification and filtering.

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