Kenmore 721.626434 Test And Checkout Precedures And Troubleshooting, Cautions, A. Test Procedures

TEST AND CHECKOUT PRECEDURES AND TROUBLESHOOTING

- CAUTIONS -

-DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER REMOVINGING THE CABINET FROM THE UNIT. PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. (SEE FIGURE 24)

-ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF WATER IN CONTAINER) IN THE OVEN.

Filament

Winding

Secondary

Winding

Primary

Winding

		Figure 24
A. TEST PROCEDURES
COMPONENTS	TEST PROCEDURES	RESULTS
	1) Measure the resistance: Across the
	filament terminals of the magnetron	Normal reading:
	with an ohm-meter on Rx1 scale.	Less than 1 ohm.
	2) Measure the resistance: Between	Normal reading:
MAGNETRON	each filament terminal of the	Infinite ohms.
(Wire leads are	magnetron and the chassis ground	NOTE: Replace the magnetron, if the
removed)	with an ohm-meter on high test scale.
		magnetron checks and all of the
		high voltage component tests are
		good, but the unit still does not heat
		a load.
	1) Measure the resistance:
	With an ohm-meter on Rx1 scale.	Normal readings:
	a. Primary winding;	Approx. 0.3 to 0.5 ohm.
HIGH-VOLTAGE	b. Filament winding;	Less than 0.1 ohm.
	c. Secondary winding;	Approx. 65 to 120 ohms.
TRANSFORMER
(Wire leads are	2) Measure the resistance:
removed)
	With an ohm-meter on highest scale.	Normal readings:
	a. Primary winding to ground;	Infinite ohms.
	b. Filament winding to ground;	Infinite ohms.

NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON.

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