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Troubleshooting and Testing
Procedure
Letter
2. Control Unit
The following symptoms indicate a defective control unit. Before replacing the control unit, perform
the Key unit test (Procedure Q) to determine if control unit is faulty.
2-1. In connection with pads.
1. When touching the pads, a certain group of pads do not produce a signal.
2. When touching the pads, no pads produce a signal.
2-2. In connection with indicators.
1. At a certain digit, all or some segments do not light up.
2. At a certain digit, brightness is low.
3. Only one indicator does not light.
4. The corresponding segments of all digits do not light up; or they continue to light up.
5. Wrong figure appears.
6. A certain group of indicators do not light up.
7. The figure of all digits flicker.
8. The following symptoms indicate a defective LSI unit.
2-3. Other possible problems caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.
d) Proper temperature measurement is not obtained.
When testing is completed,
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. Reconnect all leads removed from components during testing.
5. Re-install the outer case (cabinet).
6. Reconnect the power supply cord after the outer case is installed.
7. Run the oven and check all functions.
When defective components, the Control Unit or Key Unit are replaced, the defective
part or parts must be properly packed for return in the shipping carton, with its cushion
material, in which the new replacement part was shipped to you.
• When touching the keys on the touch screen, a certain key produces no signal at all.
• When touching a number key on the touch screen, two figures or more are displayed.
• When touching the keys on the touch screen, sometimes a key produces no signal.
Component Test
3-12
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