Standard

APS 107 - Microwave Ovens

Course Description

Introduces the use of tools, materials, and service procedures to restore electronic circuits of microwave ovens to safe, full-range operation. Emphasis is placed on the fundamental theory and practical application of electronic components to appliance circuits. Topics include: microwave theory, circuit symbols and schematics, radiation leakage measurement, safety interlocks, electrical and electronic components, and service practices.

Competency Areas		Hours
Microwave Theory		Class	3
Circuit Symbols and Schematics		D. Lab	2
Radiation Leakage Measurement		P. Lab/O.B.I.	3
Safety Electrical and Electronic Components Interlocks		Credit	5
Service Practices
Prerequisite:	IFC 102, APS 110, and program admission
Corequisite:

Course Guide

Competency	After completing this section, the student will:	Hours
		Class	D.Lab	P.Lab/ O.B.I.
MICROWAVE THEORY		4	0	0
Historical development	Describe the historical development of microwave oven technology.
Spectrum of operation	Identify the range of radio frequencies that microwave ovens emit.
Myths	Explain myths relating to microwave generation. Describe microwave oven factual operational conditions.
CIRCUIT SYMBOLS AND SCHEMATICS		6	0	0
Electrical symbols	Identify electrical components of microwave ovens using symbols in schematic diagrams.
	Describe the function of electrical components in microwave ovens.
Electronic symbols	Identify electronic components of microwave ovens using symbols in schematic diagrams.
	Describe the function of electronic components in microwave ovens.
Integrated circuit symbols	Identify integrated circuit components of microwave ovens using symbols in schematic diagrams.
	Describe the function of electronic components in microwave ovens.
RADIATION LEAKAGE MEASUREMENT		6	2	10
Measurement instruments	Identify test equipment for microwave oven function and component testing.
Federal guidelines	Relate minimum acceptable operational characteristics for microwave ovens as presented by federal guidelines.
SAFETY ELECTRICAL AND ELECTRONIC COMPONENTS		8	0	10
Components	Identify the components used in microwave oven interlock circuitry.
	Describe the function of components used in microwave oven interlock circuitry.
Interlock circuit	State conditions which interrupt the operation of microwave oven interlock circuitry.
Servicing practice	Service microwave oven interlock circuits.
	Service microwave cabinet hardware.
Electrical terminology and applications	Identify transformers, capacitors, fan motors, and turntable motors used in microwave ovens.
	Describe the function of transformers, capacitors, fan motors, and turntable motors used in microwave ovens.
Electronic terminology and applications	Identify magnetron tubes, TRIAC circuit rectifiers, transistors, silicon controlled rectifiers, varistors, and thermistors used in microwave ovens.
	Describe the function of magnetron tubes, TRIAC circuit rectifiers, transistors, silicon-controlled rectifiers, varistors, and thermistors used in microwave ovens.
SERVICE PRACTICES		6	0	30
Components	Service microwave oven power level control circuits.
	Service microwave oven timing circuits.
	Service microwave oven cabinet hardware.
	Service microwave oven magnetron tube circuits.
Safety practices	Identify safe working practices to use when servicing microwave ovens.
	Conform to safe working practices during performance of microwave oven service operations.

Suggested Resources

Books

Mid-America Vocational Curriculum Consortium. (1986). Microwave oven repair. Stillwater, OK: Author.

Whirlpool Corporation. (1988). Diagnosis and repair of Whirlpool microwave ovens, KM-2. LaPorte, IN: Author.

Whirlpool Corporation. (1988). Understanding Whirlpool electronic control microwave ovens, KM-4. LaPorte, IN: Author.

Whirlpool Corporation. (1989). Fundamentals of Whirlpool microwave ovens, KM-1. LaPorte, IN: Author.

Audiovisuals

Mid-America Vocational Curriculum Consortium. (1986). Microwave oven repair (Transparency Set No. 601303). Stillwater, OK: Author.

Whirlpool Corporation. (1988). Diagnosis and repair of Whirlpool microwave ovens, KM-2 (Filmstrip No. LIT 603702 and Cassette Tape No. LIT 603704). LaPorte, IN: Author.

Whirlpool Corporation. (1988). Understanding Whirlpool electronic control microwave ovens, KM-4 (Filmstrip No. LIT 677308 and Cassette Tape No. LIT 677309). LaPorte, IN: Author.

Whirlpool Corporation. (1989). Fundamentals of Whirlpool microwave ovens, KM-1 (Filmstrip No. LIT 603433 and Cassette Tape No. LIT 603435). LaPorte, IN: Author.