Symptom control circuit is working properly explained microwave , barbecue grill is not in control of the heating circuit . The normal boot process are:qmMservice manual download site

Press the key pizza grill , set the heating time , and press the start button . IC01 barbecue control signal terminal ( 12 ) pin output low , so Q5 conduction through R15 , BBQ relay is energized by RY2 , 220V mains plus H ends of the grill heater . Be burned for heating food ( baking ) bake .qmMservice manual download site
 qmMservice manual download site
When a fault is detected , press the start button , hear the sound of barbecue relay RY2 suction units , indicating that the control circuit is normal barbecue , barbecue measure both ends of the heater H 220V voltage , thereby judging grill heater H itself is faulty . The grill heater structure as shown in the figure , the two 110V, 500w quartz heating tubes in series , installed at the top of the furnace chamber. Cause of damage in two ways: First, the individual connectors X1 ~ X4 burn rot oxidation , resulting in a series circuit is not energized , with a small oxide grinding rasp to make a good recovery connector contact failure can be ruled out. Second, the two quartz heating tubes have a burn , heat pipes at both ends with a multimeter to measure the normal resistance of about 24Ω, if infinite resistance , indicating that the pipe burn . With 110V, 500w quartz heating pipe replacement, troubleshooting .qmMservice manual download site