Daewoo KOT-150S0A, Руководство по обслуживанию

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TROUBLE SHOOTING
Following the procedures below to check if the oven is defective or not.
1. Check grounding before checking trouble.
2. Be careful of the high voltage circuit.
3. Discharge the high voltage capacitor.
4. When checking the continuity of switches of of the high voltage transformer, disconnect one lead wire from these parts
and then check conitnuity with the AC plug removed. To do otherwise may result in false reading of damage to your
meter.
5. Do not touch and part of the circuitry on the touch control circuit since static electric discharge may damage this control
panel.
Always touch yourself to ground while working on this panel to discharge any static charge built up in your body.
First of all operate the microwave oven following the correct operation described on pages 6~19 by time cooking, in order
to find the exact cause of any trouble.
(TROUBLE 1) The following visual conditions indicate a probable defective touch control circuit or membrane switch
assembly.
1. Incomplete segments.
(A) Segments missing.
(B) Partial segments missing.
(C) Digit flickering other than normal fluorescent slight flickering.
(D) "TOUCH CLOCK PAD TO ENTER TIME OF DAY" does not disply when power is on.
2. A distinct change in the brightness of one or more numbers in the display.
3. One of more digits in the display are not on when they should be.
4. Display indicates a number different from one touched.
5. For example, touch 5 and 3 appears in the display.
6. Specific numbers (for example 5 and 3) will not display when the panel is touched.
7. Display does not count down or up with time cooking or clock operation.
8. Oven is programmable and cooks normally but no display shows.
9. Display obviously jumps in time while counting down.
10. Display counts down noticeably too fast while cooking.
11. Display can not shift from the first stage cooking to the third stage cooking while 3 phase cooking (including defrost).
12. Display does not show the time of day when dear pad is touched (in clock mode).
13. Oven lamp and fan motor and tum table motor do not stop although cooking is finished.
Check if the RELAY 5 and 6 contacts close if they are close, replace touch control circuit.