Daewoo KOC-154K Service Manual download pdf (Page 34)

3. Case of no microwave oscillation

1) When touching M/W button, oven lamp turns on and Fan motor and turntable rotate, and cook indicator in

display comes on.

*Cause: RELAY 1 does not operate.

- Check method

2) When touching M/W button, oven lamp does not turn on and turntable motor does not rotate but cook indicator

in display comes on.

*Cause: RELAY 6 does not operate.

- Check method

3) When touching M/W button, oven lamp turns on and fan motor does not rotate but cook indicator in display

comes on.

*Cause: RELAY 7 does not operate.

- Check method

STATE

RELAY 1 ON

RELAY 1 OFF

POINT A

+5V DC

GND

POINT B

GND

+24V DC

Q15

STATE

RELAY 6 ON

RELAY 6 OFF

POINT A

+5V DC

GND

POINT B

GND

+24V DC

D14

RY5

Q11

STATE

RELAY 7 ON

RELAY 7 OFF

POINT A

+5V DC

GND

POINT B

GND

+24V DC

D15

RY6

Q12

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 40

Service Manual 1
TABLE OF CONTENTS 2
1. SAFETY AND PRECAUTIONS 3
3. EXTERNAL VIEW 4
2. SPECIFICATIONS 4
4. INSTALLATION 6
EARTHING INSTRUCTIONS 6
5. CONTROL PANEL 7
6. DISASSEMBLY AND ASSEMBLY 8
1. To remove cabinet 9
2. To remove door assembly 9
3. To remove door parts 10
A01 A02 A03 A04 10
A05A06A10A07A08A09 10
◆ High voltage circuit wiring 13
7. To remove magnetron 13
9. To remove H.V.transformer 14
CUTTING (6EA) 18
8. TROUBLESHOOTING GUIDE 20
9. MEASUREMENT AND TEST 26
9-2. MICROWAVE RADIATION TEST 27
9-3. COMPONENT TEST PROCEDURE 28
10. WIRING DIAGRAM 30
TOTAL ASSEMBLY 31
12. PRINTED CIRCUIT BOARD 33
13. P.C.B. CIRCUIT DIAGRAM 37
C.P.O. BOX 8003 SEOUL, KOREA 40
TELEX: DWELEC K28177-8 40
CABLE: “DAEWOOELEC” 40

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Daewoo KOC-154K Service Manual Page 34

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