Appliance Repair Course

Lesson 1 • Safe Workshop Setup

Defines workspace organization, grounding, and ventilation standards for a repair bench. A properly configured workspace prevents accidents and improves efficiency.

Lesson 2 • Lockout and Tagout Procedures

Teaches energy isolation methods to prevent accidental energization during repairs. Correct lockout/tagout practice is mandatory before disassembly.

Lesson 3 • Understanding Electrical Hazards

Covers shock, arc flash, and fire risks inherent in appliance repair work. Establishes the risk-awareness mindset required throughout the course.

Lesson 1 • Common Electronic Components

Identifies resistors, capacitors, inductors, diodes, and transistors by function and symbol. Component recognition is required for reading schematics and testing circuits.

Lesson 2 • AC Circuit Principles

Covers frequency, RMS values, impedance, and phase relationships in AC systems. Most household appliances operate on AC, making this knowledge essential.

Lesson 3 • Power Supplies and Transformers

Explains how appliances convert mains voltage to usable DC or lower AC levels. Understanding power supply stages is critical for diagnosing dead appliances.

Lesson 4 • Reading Wiring Diagrams and Schematics

Teaches interpretation of schematic symbols, wiring diagrams, and block diagrams. Accurate schematic reading accelerates fault isolation in complex appliances.

Lesson 1 • Digital Multimeter Operation

Covers voltage, current, resistance, continuity, and diode test modes. The multimeter is the primary diagnostic tool used in every subsequent chapter.

Lesson 2 • Oscilloscope Basics for Appliance Repair

Introduces waveform capture, time base, and trigger settings for appliance signals. Oscilloscopes reveal intermittent faults invisible to a multimeter.

Lesson 3 • Clamp Meter and Insulation Tester

Explains non-contact current measurement and insulation resistance testing. These tools detect overload conditions and insulation breakdown in motor-driven appliances.

Lesson 1 • Reassembly and Functional Verification

Guides correct reassembly sequence, connector seating, and initial power-on checks. Verification confirms the repair is complete before returning the appliance.

Lesson 2 • Visual and Physical Inspection

Covers inspection of PCBs, wiring, mechanical parts, and thermal damage indicators. Visual inspection often reveals the fault before any measurement is taken.

Lesson 3 • Cleaning and Preparation

Explains safe cleaning methods for PCBs, mechanical assemblies, and housings. Clean components improve contact reliability and extend repaired appliance life.

Lesson 4 • Hand Tools for Appliance Repair

Identifies screwdrivers, nut drivers, spanner sets, and specialty tools used in disassembly. Correct tool selection prevents fastener damage and speeds teardown.

Lesson 1 • Heating Element Theory and Testing

Explains resistive heating principles and how to measure element resistance and continuity. Element failure is the most common fault in heating appliances.

Lesson 2 • Thermostats and Thermal Cutoffs

Covers bimetallic, capillary, and electronic thermostats plus one-shot thermal fuses. These devices protect appliances from overheating and must be verified after repair.

Lesson 3 • Diagnosing Electric Ovens and Ranges

Applies element and thermostat testing to full oven diagnosis including control boards. Systematic fault isolation reduces unnecessary part replacement.

Lesson 1 • Motor Replacement and Run-In Testing

Guides correct motor mounting, coupling alignment, and post-replacement load testing. Proper installation prevents premature motor failure after repair.

Lesson 2 • Motor Testing and Fault Diagnosis

Covers winding resistance, insulation, and capacitor tests to isolate motor faults. Accurate motor testing prevents replacing a good motor unnecessarily.

Lesson 3 • Electric Motor Fundamentals

Explains motor types, starting methods, and torque-speed characteristics relevant to appliances. Motor theory guides correct diagnosis and part selection.

Lesson 4 • Washing Machine Diagnosis and Repair

Applies motor and control diagnostics to top-load and front-load washing machines. Washing machines combine motor, pump, valve, and control faults in one platform.

Lesson 1 • Refrigerant Handling and Safety

Covers safe refrigerant recovery, handling, and recharge procedures per environmental regulations. Improper refrigerant handling is illegal and environmentally harmful.

Lesson 2 • Compressor and Sealed System Diagnosis

Tests compressor windings, starting components, and system pressures to identify sealed-system faults. Sealed-system repairs require careful diagnosis before opening the circuit.

Lesson 3 • Defrost System Diagnosis and Repair

Diagnoses defrost heaters, timers, thermostats, and sensors causing frost buildup. Defrost faults are among the most frequent refrigerator service calls.

Lesson 4 • Air Conditioner Service and Repair

Applies refrigeration and motor skills to window and split-type air conditioner diagnosis. AC units combine sealed-system, fan motor, and electronic control faults.

Lesson 1 • Soldering and Desoldering Techniques

Covers through-hole and SMD soldering, desoldering, and joint quality inspection. Quality solder joints are essential for reliable PCB-level repairs.

Lesson 2 • Power Electronics Repair

Covers diagnosis and replacement of triacs, SCRs, and IGBT modules in motor drives and heating controls. Power electronics failures cause complete appliance shutdown.

Lesson 3 • Microcontroller and Sensor Diagnosis

Diagnoses appliance microcontrollers, NTC sensors, and Hall-effect sensors using signal tracing. Sensor faults often mimic control board failures and must be ruled out first.

Lesson 4 • Component-Level Fault Isolation

Uses in-circuit and out-of-circuit testing to identify failed resistors, capacitors, and semiconductors. Component-level diagnosis avoids costly full board replacement.