1. DL manuals
  2. Daewoo
  3. Microwave Oven
  4. KOR-1A4H0P
  5. Service Manual

Daewoo KOR-1A4H0P Service Manual

Summary of KOR-1A4H0P

  • Page 1

    Service manual microwave oven model : kor-1a4h0p daewoo electronics co., ltd. Http://svc.Dwe.Co.Kr s/m no.:.

  • Page 2: Table of Contents

    1 table of contents safety and precautions ........................................................................................................ 2 1. For safe operation ............................................................................................................. 2 2. For safe serv...

  • Page 3

    2 safety and precautions 1. For safe operation d am age that allow s the m icrow ave energy (that cooks or heats the food) to escape w ill result in poor cooking and m ay cause serious bodily injury to the operator. If a n y o f t h e f o llo w in g co n d it io n s e x is t, o p e rato r m u s t n ...

  • Page 4

    3 specifications specifications are subject to change without notice. 1) kor-1a4h model kor-1a4h0p power supply 220v~60hz, single phase with earthing power consumption microwave 1400w grill combination microwave energy output 1000w microwave frequency 2450mhz outside dimensions (w x h x d) 539 x 300...

  • Page 5

    4 external view 1. Outer dimension 1) kor-1a4h 435 539 300 microwave oven m/w dish warmer fresh vegetable frozen vegetable auto defrost fish poultry meat 1hour power kitchen timer stop/ clear start/ speedy cook defrost clock 10 m. 1 m. 10 s. 10min. 1min. Frozen pizza pasta beverage def. Timer lock g...

  • Page 6

    5 1) kor-1a4h 1. Door seal door seal maintains the microwave within the oven cavity and prevents microwave leakae. 2. Door hook when the door is closed, it will automatically lock shut. If the door is opened while oven operating, magnetron tube will immediately stop operating. 3. Door screen allows ...

  • Page 7

    6 1) kor-1a4h 1. Time set pad - used to set the cooking time and the present time. 2. Display - cooking time, power level, indicators and present time are displayed. 3. One touch - used to cook or reheat specific quantities of food. 4. More - used to add time to cooking. 5. Less - used to remove tim...

  • Page 8

    7 installation 1. Steady, flat location t his m icrow ave oven should be set on a steady, flat surface. T his m icrow ave oven is designed for counter top use only. 2. Leave space behind and side a ll air vents should be kept a clearance. If all vents are covered during operation, the oven m ay over...

  • Page 9

    8 1. Connect the m ain lead to an electrical outlet. 2. After placing the food in a suitable container, open the oven door and put it on the glass tray. The glass tray m ust always be in place during cooking. 3. Close the door securely. 4. W hen the oven door is opened, the light turns off. 5. The o...

  • Page 10

    9 disassembly and assembly cautions to be observed when trouble shooting. Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. It is completely safety during normal operation. However, carelessness in servicing the oven can result in an electric shock or possible...

  • Page 11

    10 disassembly and assembly 1. To remove cabinet 1) remove three screws on cabinet back. 2) push the cabinet backward. 2. To remove door assembly 1) remove screws which secure the stopper hinge top. 2) remove the door assembly from top plate of cavity. 3) reverse the above for reassembly. After repl...

  • Page 12

    11 1) kor-1a4h (1) remove the gasket door from door plate. (2) remove the barrier screen inner from door plate. (3) remove the door frame from door plate. (4) remove the stopper hinge top from door plate. (5) remove the spring and the hook. (6) remove the barrier screen outer from door frame. (7) re...

  • Page 13

    12 4. Method to reduce the gap between the door seal and the oven front surface. 1) to reduce gap located on part 'a' loosen two screws on stopper hinge top, and then push the door to contact the door seal to oven front surface. Tighten two screws. 2) to reduce gap located on part 'b ' loosen two sc...

  • Page 14

    1) kor-1a4h 1) remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly. 2) remove four screws which secure the pcb assembly to control panel. 3) disconnect membrane tail from the connector of the pcb assembly. 4) detach membrane from the con...

  • Page 15

    Disassembly and assembly 6. To rem ove high voltage capacitor. 1) rem ove a screw which secure the grounding ring term inal of the h.V.Diode and the capacitor holder. 2) rem ove the h.V. Diode from the capacitor holder. 3) reverse the above steps for reassem bly. H igh voltage circuit w iring 7. To ...

  • Page 16

    Disassembly and assembly 8. To remove wind guide assembly. 1) rem ove a screw which secure the wind guide assem bly. 2) draw forward the wind guide assem bly. 3) pull the fan from the m otor shaft. 4) rem ove two screws which secure the m otor shaded pole. 5) rem ove the m otor shaded pole. 6) rever...

  • Page 17

    Interlock mechanism and adjustment the door lock m echanism is a device which has been specially designed to com pletely elim inate m icrowave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave. (1) prim ary interlock ...

  • Page 18

    Trouble shooting guide following the procedure below to check if the oven is defective or not. 1) check grounding before trouble checking. 2) be careful of the high voltage circuit. 3) discharge the high voltage capacitor. 4) when checking the continuity of the switches, fuse or high voltage transfo...

  • Page 19

    Trouble shooting guide condition check result cause remedy outlet has proper voltage fuse does not blow. Check continuity of magnetron no continuity defective magnetron replace display do not shown countdown no continuity normal defective touch control circuit open power supply cord malfunction of s...

  • Page 20

    (trouble 3) no microwave oscillation even though fan motor rotates. Trouble shooting guide condition check result continuity continuity in backward direction 0 Ω or infnity no continuity no continuity 0 v appro x 15 vdc cause defective high voltag transformer defective high voltag rectifier defectiv...

  • Page 21

    (trouble 4) the following visual conditions indicate a profective touch control circuit or membrane switch assembly. 1. Incomplete segments, 1) segments missing. 2) partical segments missing. 3) digit flickering other than normal display slight flickering. 4) ":0" does not display when power is on. ...

  • Page 22

    Measurement and test 1. Measurement of the microwave power output microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below. Procedure 1. Microwave power output measurement is made with the microwave ove...

  • Page 23

    Measurement and test 2. Microwave radiation test procedures 1. Prepare microwave energy survey, 600cc glass beaker, and glass thermometer 100 (212 ) 2. Pour 275cc 15cc of tap water initially at 20 5 (68 9 ) in the 600cc glass breaker with an inside diameter of approx. 95mm(3.5in.). 3. Place it at th...

  • Page 24

    3. Component test procedure high voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. It is neither necessary nor advisable to attempt measurement of the high voltage. Before touching any oven components or wiring, always unplug the oven from its ...

  • Page 25

    Wiring diagram 1) kor-1a4h0p 24.

  • Page 26

    Printed circuit board 1. Circuit check procedure 1) low voltage transformer check the low voltage transformer is located on the p.C.B. Measuring condition : input voltage : 120v / frequency : 60hz 2) voltage check - key check point - check method terminal voltage load no load 4 - 7 ac 24.7v ac 29.7v...

  • Page 27

    Printed circuit board measure point mp1 mp2 26.

  • Page 28

    3) when there is no microwave oscillation 1) when touching start pad, oven lamp does not turn on. Fan motor do not rotate, but cook indicator in display comes on. * cause : relay 2 does not operate. Refer to circuit diagram (point 3) - check method 2) when touching start pad, oven lamp turns on. Fan...

  • Page 29

    Printed circuit board 2. P.C.B. Circuit diagram vl1 4,5 v2:-12v v1:-5v 3 cn3 2 1 7 lvt1 1 6 3 r12 r9 r15 zd2 r14 q6 r13 d6 d14 d13 ec2 r16 d12 c7 r18 cr1 r17 c4 c3 zd1 ec1 c5 c6 cn1 bz1 (tray,fan,lamp) (magnetron) ry2 ry1 r19 d10 d9 d11 d.O.M sw r8 q10 q9 1 2 r22 c1 r11 r23 q11 ic1 sj3 ra1 sj6 sj5 s...

  • Page 30

    3. P.C.B. Location no no. Name symbol specification part code qíty 1 buzzer bz1 bm-20k 3515600100 1 2 c array ca1 7p(6) 102m 50v cn4xb-102m 1 3 capacitor elec ec1 50v rs 1mf cexe1h109a 1 4 capacitor elec ec2 25v rss 1000uf cexf1e102v 1 5 connector wafer cn1 yw396-02av 3519150520 1 6 connector wafer ...

  • Page 31

    Exploded view and parts list 1. Door assembly refer to disassem bly and assem bly. 2. Control panel assembly refer to disassem bly and assem bly. 3. Total assembly 1) kor-1a4h 30

  • Page 32

    Ref.No part code part name description q'ty remark a00 3511711220 door as kor-14ag0a 1 b00 pkcpswxr10 control-panel as kor-1a4h0p 1 f01 3510802500 cabinet pcm t0.6 1 f02 3516004100 special screw t1 trs lr4 pole 4*10 se mfzn 3 f03 3516110400 cavity as kor-1a1g0a 1 3516110000 cavity joint as kor-1a1g0...

  • Page 33

    Ref.No part code part name description q'ty remark f38 3966310100 motor syncro 220v 2.5w gm-16-24fd12 1 f39 3518905400 thermostat off:90 on:60 h#187 nb 1 f40 3513003400 holder thermostat pp 1 f41 7272400811 special taptite tt3 trs 4x8 mfzn 2 f42 3511406200 cover wave guide heatproof pp 1 f43 3517400...

  • Page 34

    Daewoo electronics co., ltd 686, ahyeon-dong mapo-gu seoul, korea c.P.O. Box 8003 seoul, korea telex : dwelec k28177-8 printed date : jan. 2002 daewoo electronics co., ltd 686, ahyeon-dong mapo-gu seoul, korea c.P.O. Box 8003 seoul, korea telex : dwelec k28177-8 printed date : jan. 2002 daewoo elect...