Maytag UMV1152CA Testing Procedures, 16027303, Illustration, Component, Test Procedure, Results

Testing Procedures

!WARNING

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

Illustration	Component	Test Procedure		Results
	Low voltage	Remove low voltage transformer from control
	transformer	circuit board and check:
		(Measure at room temp., or 68° F/20° C.)	Approx. 128 Ω..
		Between pins 1 and 2 (Input)
		Between pins 4 and 5 (19v output)	Approx. 2 Ω..
		Between pins 6 and 7 (7.0v output)	Approx. 2 Ω..
		Between pins 7 and 8 (2.7v output)	Approx. 5 Ω..
	Low voltage	Remove low voltage transformer from control
	transformer	circuit board and check:
	AMV5164BC*,	(Measure at room temp., or 68° F/20° C.)	Approx. 243 Ω..
	MMV5165BA*	Between pins 1 and 2 (Input)
		Between pins 4 and 5 (19v output)	Approx. 11 Ω..
		Between pins 7 and 8 (2.7v output)	Approx. 2 Ω..
	Low voltage	Remove low voltage transformer from control
	transformer	circuit board and check:
	AMV5164BA*,	(Measure at room temp., or 68° F/20° C.)	Approx. 379 Ω..
	AMV1154BA*,	Between pins 1 and 2 (Input)
	MMV1153BA*,	Between pins 4 and 5 (19v output)	Approx. 11 Ω..
	UMV1152CA*	Between pins 7 and 8 (2.7v output)	Approx. 2 Ω..
	Magnetron	Discharge Capacitor	Between Terminals: Less than 1 Ω.
			Each Terminal to Ground: Infinite Ω..
		Remove wires from magnetron and connect	NOTE: This test is not conclusive. If
		ohmmeter to terminals. Also check between	microwave oven does not heat and all
		each terminal and ground.	other components test good, replace the
			magnetron and retest.
	High Voltage	Discharge Capacitor	Between Terminals: Meter should
	Capacitor	Remove wires from capacitor terminals and	momentarily indicate continuity, then 9
		connect ohmmeter, set on highest resistance	MΩ (deflection). A steady 9 MΩ indicates
		scale to terminals.	an open capacitor. Steady continuity
			indicates a shorted capacitor. In either
		Check resistance between each terminal and	case, replace capacitor.
		capacitor case	Infinite Ω.
	High Voltage Diode	Discharge Capacitor	Infinite resistance should be measured in
		Remove diode lead from capacitor and	one direction and several hundred KΩ in
		connect ohmmeter.	the opposite direction.
			NOTE: Ohmmeter must contain a battery
	Power Control Relay	Reverse leads for second test.	of 6 volts minimum.
		Disconnect the leads. Place water in the	Power Level	Cycle On	Cycle Off
		microwave oven and select power levels 1		(Continuity)	(Open)
		through 10. Press the START pad. Check	1	4 sec	26 sec
		continuity between the terminals of the relays ...	2	7 sec	23 sec
			3	10 sec	20 sec
			4	13 sec	17 sec
			5	16 sec	14 sec
			6	19 sec	11 sec
			7	22 sec	8 sec
			8	25 sec	5 sec
			9	28 sec	2 sec
			10	30 sec	0 sec
	Grill heater element	Remove all wires from heater.
	JMV9169BA*,	Measure resistance across terminals	Approx. 15-25 Ω (70° F, 20° C).
	JMV8166BA*,
	AMV6167BD*

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