Daewoo KOC-154K Service Manual download pdf (Page 24)

(TROUBLE 6)

Lower heater is not heated; food will not become hot.

CONDITION CHECK

Check continuity of

Primary interlock switch

Malfunction of

primary Interlock

switch

RESULT

continuity

CAUSE

REMEDY

Adjust or

Replace

Lower heater

Is not heated

Check D.C voltage

Being supplied to

RELAY (RY7) coil

Faulty contacts of

RELAY

(RY7) or open

relay coil

Replace

Check continuity of

secondary interlock

switch

Malfunction of

secondary

interlock switch

continuity

Adjust or

replace

Defective

Touch control

circuit

Approx.

24V DC

Replace

Check continuity of

heater

Defective heater

continuity

Replace

CONDITION CHECK

Check each button for

continuity of the button

Malfunction of

touch control

circuit of control

box sub-assembly

RESULT

Normal

CAUSE REMEDY

Replace

control box

sub-assembly

Display does

not show

programming

at all, even if

keyboard is

touched.

(TROUBLE 7)

The following visual conditions inditions indicate a probable defective touch control Circuit or button P.C.B.

assembly

1. Incomplete segments.

1) segment missing

2) partial segments missing

3) digit flickering other than normal fluorescent slight flickering

2. A distinct change in the brightness of one or more numbers exists in the

display.

3. One or more digits in the display are not on when they should be.

4. Display does not count down or up with time cooking or clock operation.

5. Oven is programmable and cooks normally but no display shows.

6. Display obviously jumps in time while counting down.

7. Display counts down noticeably too fast while cooking.

8. Display does not show the time of day when clear button is touched.

9. Oven lamp and turn table motor do not stop although cooking is finished.

Check if the RELAY(RY4) contacts close and if they are close, replace touch control circuit.

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Daewoo KOC-154K Service Manual Page 24

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