LG MB-387W Service Manual - Page 24
CONDITION, CHECK, RESULT, CAUSE, REMEDY, TROUBLE 2, Oven does not operate at all ; Display window
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(TROUBLE 2) Oven does not operate at all ; Display window does not display any figures and no input is accepted. CONDITION 1. Fuse blows. CHECK Check continuity of monitor switch (with door closed). Replace fuse Check continuity of primary switch (with door opened). RESULT Continuity. No continuity. Continuity. No continuity. CAUSE Malfunction of the monitor switch. REMEDY Replace primary and monitor switches. Shorted contact at the primary switch. Replace primary and monitor switches. Disconnect one side of the wire lead connected from transformer to the high voltage capacitor and operate the unit. Normal. Fuse blows again Defective high voltage capacitor. Defective high voltage transformer. Replace high voltage capacitor. Replace high voltage transformer. NOTE : All these switches must be replaced at the same time. Refer to page 5-6, 5-7 2. Fuse does not blow. Check continuity of magnetron thermostat. No continuity. Continuity. Check continuity of power supply cord. No continuity. Defective magnetron thermostat. Replace magnetron thermostat. Defective power supply cord. Replace power supply cord. 5-14