Testing Procedures

!WARNING

To avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitor before servicing, unless testing requires power.

Illustration	Component	Testing	Results
	Thermal cutout	Disconnect all wires from TCO.
		Measure resistance across terminals.	Closed at 32°F (0°C) and
		Cavity TCO	Closed at 32°F (0°C) and
		Magnetron TCO	Opens at 230°F (110°C)
		Magnetron TCO	Closed at 140°F (60°C) and
			Opens at 320°F (160°C)
	Diode	Discharge Capacitor	Infinite resistance should be
			measured in one direction and 50KΩ
		Remove diode lead from capacitor and	or more in the opposite direction.
		connect ohmmeter.	NOTE: Ohmmeter must contain a
		Reverse leads for second test.	NOTE: Ohmmeter must contain a
		Reverse leads for second test.	battery of 6 volts minimum.
	Circuit Protector	Discharge Capacitor	Infinite resistance should be
			measured in one direction and 50KΩ
		Remove diode lead from capacitor and	or more in the opposite direction.
		connect ohmmeter.	NOTE: Ohmmeter must contain a
		Reverse leads for second test.	NOTE: Ohmmeter must contain a
		Reverse leads for second test.	battery of 6 volts minimum.
	Capacitor	Discharge Capacitor
		Remove wires from capacitor terminals	Between Terminals: Meter should
		and connect ohmmeter, set on highest	momentarily deflect towards zero
		resistance scale to terminals.	then return to over 5 MΩ. If no
			deflection occurs, or if continuous
			deflection occurs, replace capacitor.
		Also check between each terminal and
		capacitor case.	Terminal to Case: Infinite resistance
	Magnetron	Discharge Capacitor	Between Terminals: Less than 1 Ω
		Remove wires from magnetron and	Each terminal to ground measures
		connect ohmmeter to terminals. Also	Infinite resistance.
		check between each terminal and	Note: This test is not conclusive. If
		ground.	oven does not heat and all other
			components test good replace the
			magnetron and retest.
	Blower motor	Remove all wires from motor.
		Measure resistance across coil	Approximately 31 – 35 Ω
	Stirrer motor	Remove all wires from motor.
		Measure resistance across terminals ....	Approximately 12 – 14 KΩ
Secondary	Transformer	Discharge Capacitor
Secondary		Remove all wires from terminals.
Filament		Measure resistance from:
		Measure resistance from:	Less than <1 Ω
Primary		Primary	Less than <1 Ω
Primary		Filament	Less than <1 Ω
		Filament	Less than <1 Ω
		Secondary to Ground screw on
		transformer stack	Approximately 70 – 80 Ω
	Lamp receptacle	Test continuity of receptacle terminals.	Indicates continuity with bulb
			installed.
	Wire Harness	Test continuity of wires	Indicates continuity

16026795

1800 W - 2005 specifications

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Testing Procedures

Illustration

Component

Testing

Results

Discharge Capacitor

1800 W - 2005 specifications