R-24AT. R22AT and R24AT Alternative - Sharp Home Appliance Service Manual (repair manual). Page 17

15

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.