Sharp R-22AT, R-24AT service manual Test Procedures, Letter, Component Test, Steps

R-22AT

R-24AT

TEST PROCEDURES

PROCEDURE
LETTER		COMPONENT TEST
	STEPS	OCCURRENCE	CAUSE OR CORRECTION
	1	The rated AC voltage is not present at	Check supply voltage and oven power cord.
		POWER terminal of CPU connector (CN-A).
	2	The rated AC voltage is present at primary	Touch control transformer or secondary circuit defective.
		side of touch control transformer.	Check and repair.
	3	Fuse on the PWB is open.	Replace the fuse with new one.
			(CARRY OUT 3D CHECKS BEFORE REPAIR)

NOTE: *At the time of these repairs, make a visual inspection of the varistor for burning damage and examine the transformer with tester for the presence of layer short-circuit (check primary coil resistance). If any abnormal condition is detected, replace the defective parts.

CARRY OUT 4R CHECKS.

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