Daewoo KOC-621Q0S Service Manual - 4. Installation

Page of 36

Download

Print this page

Bookmark us

1. Steady, flat location

This microwave oven should be set on a steady, flat surface.

This microwave oven is designed for counter top use only.

2. Leave space behind and side

All air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually,

cause failure.

3. Away from Radio and TV sets

Poor television reception and radio interference may result if the oven is located close to a TV, Radio, antenna or feeder

and so on.

Position the oven as far from them as possible.

4. Away from heating appliances and water taps

Keep the oven away from hot air, steam or splash when choosing a place to position it, or the insulation might be

adversely affected and breakdowns occur.

5. Power supply

• Check your local power source. This microwave oven requires a current of approximately 12 amperes, 230V, 50Hz.

• Power supply cord is about 1.2 meters long.

• The voltage used must be the same as specified on this oven. Using a higher voltage may result in a fire or other

accident causing oven damage. Using low voltage will cause slow cooking. We are not responsible for damage

resulting from use of this oven with a voltage of ampere fuse other than those specified.

• This appliance is supplied with cable of special type, which, if damaged, must be repaired with cable of same type.

• Such a cable can be purchased from DAEWOO and must be installed by a Qualified Person.

6. Examine the oven after unpacking for any damage such as:

A misaligned door, broken door or a dent in cavity.

If any of the above are visible, DO NOT INSTALL, and notify dealer immediately.

7. Do not operate the oven if it is colder than room temperature.

(This may occur during delivery in cold weather.) Allow the oven to become room temperature before operating.

This appliance must be earthed. In the event of an electrical short circuit, earthing reduces the risk of the electric shock by

providing an escape wire for the electric current. This appliance is equipped with a cord having a earthing wire with a

earthing plug. The plug must be plugged into an outlet that is properly installed and earthed.

4. INSTALLATION

EARTHING INSTRUCTIONS

WARNING

Improper use of the earthing plug can result in a risk of electric shock.

Consult a qualified electrician of serviceman if the earthing instructions are not completely understood, or if doubt

exists as to whether the appliance is properly earthed, and either:

If it is necessary to use an extension cord, use only a 3-wire extension cord that has a 3-blade earthing plug, and a

3-slot receptacle that will accept the plug on the appliance.

The marked rating of the extension cord should be equal to or greater than the electrical rating of the appliance, or

Do not use an extension cord.

« ‹ Prev 3 4 5 6 7 8 9 Next › »

Summary of KOC-621Q0S

Page 1
Service manual microwave oven model: koc-621q0s s/m no. : c621q0s001 daewoo electronics co., ltd. Http://svc.Dwe.Co.Kr dec. 2001.
Page 2: Table of Contents
1 precautions to be observed before and during servicing to avoid possible exposure to excessive microwave energy (a) do not operate or allow the oven to be operated with the door open. (b) make the following safety checks on all ovens to be serviced before activating the magnetron or other microwav...
Page 3: 1. Safety and Precautions
2 1. Safety and precautions 1. For safe operation damage that allows the microwave energy (that cooks or heats the food) to escape will result in poor cooking and may cause serious bodily injury to the operator. If any of the following conditions exist, operator must not use the appliance. (only a t...
Page 4: 3. External View
3 3. External view 470 285 376 2. Specifications model koc-621q0s power supply 230v~50hz, single phase with earthing microwave 1250w power grill 1250w consumption oven 1650w combination 2500w microwave energy output 800w(iec705) microwave frequency 2450mhz outside dimensions (w x h x d) 470x285x376m...
Page 5
4 m/w 1. Roast beef 3. Roast chicken 5. Vegetable auto cook m/w def. Grill temp g 2. Roast pork 4. Fish fillets grill combi temp clock combi koc-621q stop/ clear defrost 1000g 100g 10m. 1m. 10s. Auto cook start/ speedy cook 1 2 e w q 7 3 4 5 8 6 9 0 1 1.Door hook when the door is closed, it will aut...
Page 6: 4. Installation
5 1. Steady, flat location this microwave oven should be set on a steady, flat surface. This microwave oven is designed for counter top use only. 2. Leave space behind and side all air vents should be kept a clearance. If all vents are covered during operation, the oven may overheat and, eventually,...
Page 7: 5. Control Panel
6 5. Control panel m/w 1. Roast beef 3. Roast chicken 5. Vegetable auto cook m/w def. Grill temp g 2. Roast pork 4. Fish fillets grill combi temp clock combi koc-621q stop/ clear defrost 1000g 100g 10m. 1m. 10s. Auto cook start/ speedy cook 2 1 3 4 5 9 q 6 7 8 0 w buttons 1. M/w - press to select mi...
Page 8: 6. Disassembly and Assembly
7 6. 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 safe during normal operation. However, carelessness in servicing the oven can result in an electric shock or possi...
Page 9
8 note: after replacting the door assembly, perform a check of correct alignment with the hinge and cavity front plate. 1. To remove cabinet 1) remove four screws on cabinet back. 2) push the cabinet backward. 2. To remove door assembly 1) remove two screws which secure the stopper hinge top. 2) rem...
Page 10
9 (1) remove the gasket door(a06) from door plate. (2) remove the door frame (a01) from door plate(a04). (3) remove the stopper hinge top(a03) from door plate(a04). (4) remove the spring(a08) and the hook(a07). (5) remove the barrier screen outer(a02) from door frame(a01). (6) reverse the above step...
Page 11
10 5. To remove control panel parts. Ref no. Part code part name description q’ty remark b01 3518523500 switch membrane koc-621q0s 1 b02 3516715810 control-panel abs 1 b03 3514325720 pcb as koc-621q0s 1 b04 7112401211 screw tapping t1 trs 4x12 mfzn 4 (1) remove four screws(b04) which secure the pcb ...
Page 12
11 caution : never install the magnetron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage. Whenever repair work is carried out on magnetron, check the microwave leakage. It shall not exceed 4mw/cm 2 for a fully assembled oven with door normally close...
Page 13
12 8. To remove wind guide assembly. 1) remove a screw for earthing. 2) remove the noise filter from the wind guide. 3) remove two screws which secure the wind guide assembly. 4) draw forward the wind guide assembly. 5) pull the fan from the motor shaft. 6) remove two screws which secure the motor s...
Page 14
13 10. To remove top heater assembly parts. 1) remove two screws 1 then pull out cover insulator *t as 2 and guide air outlet 3 . 2) remove a hex nut 4 and hex nut 5 . 3) pull out heater. 4) reverse the above steps for reassembly. Ref no. Part code part name description q’ty remark 1 7112401011 scre...
Page 15
14 11. To remove motor synchro. And under heater assembly parts. 1) cut the cover parts from the base plate. 2) remove a screw and then pull out motor syncro. 3) remove a screw 1 and then pull out the under heater *u. Assembly. 4) remove a screw 2 . 5) pull out the heater *u 3 from the cover heater ...
Page 16
15 7. Interlock mechanism and adjustment the door lock mechanism is a device which has been specially designed to completely eliminate microwave radiation when the door is opened during operation, and thus to perfectly prevent the danger resulting from the leakage of microwave. (1) primary interlock...
Page 17: 8. Trouble Shooting Guide
16 8. 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 t...
Page 18
17 condition check check continuity of magnetron defective magnetron. Result no continuity cause remedy replace outlet has proper voltage fuse does not blow? Check continuity of noise filter board defective line filter board no continuity replace check continuity of power supply cord defective touch...
Page 19
18 trouble 3) no microwave oscillation even though fan motor rotates. Condition check result check continuity of high voltage capacitor terminals with wires removed continuity cause defective high voltage transformer defective high voltage fuse remedy 1 replace no microwave oscillation check continu...
Page 20
19 (trouble 4) grill heater (upper heater) is not heated; food will not become hot. Condition check check continuity of primary interlock switch malfunction of primary interlock switch result no continuity cause remedy cause remedy adjust or replace grill heater is not heated. Check d.C voltage bein...
Page 21
20 (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 no continuity cause remedy adjust or replace lower heater is not heated check d.C voltage being supplied to relay (ry4) coi...
Page 22
21 cause remedy (trouble 8) when “err 2” or “err 3” come on display. Condition check check continuity of thermistor (resistance of thermistor) defective thermistor result 0 Ω or infinite replace “err 2” or “err 3” come on display check continuity of heater (upper, lower) defective touch control circ...
Page 23: 9. Measurement and Test
22 9. Measurement and test 9-1. 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 micro...
Page 24
23 9-2. Microwave radiation test procedure 1. Prepare microwave energy survey meter, 600cc glass beaker, and glass thermometer 100°c (212°f). 2. Pour 275cc ± 15cc of tap water initially at 20 ± 5°c (68 ± 9°f) in the 600 cc glass beaker with an inside diameter of approx. 95 mm(3.5 in.). 3. Place it a...
Page 25
24 9-3. 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 ove...
Page 26
25 4. Component action cooking mode manual m/w mode grill combi temp defrost auto roast beef cook roast pork roast chicken fish fillets vegetable magnetron ● ● ● ● ● ● ● ● upper element ● ● ● ● ● ● lower element ●.
Page 27: 10. Wiring Diagram
26 10. Wiring diagram.
Page 28
27 11. Exploded view and parts list 1. Door assembly refer to 6. Disassembly and assembly. 2. Control panel assembly refer to 6. Disassembly and assembly. 3. Total assembly.
Page 29
28 no part name description part cord q'ty a00 door as kog-62150s 3511709210 1 b00 control-panel as koc-621q0s 3516726550 1 f01 cabinet as koc-621q0s 3510806710 1 f02 screw tapping t1 trs 4*10 mfzn 7112401011 3 f03 sensor temperature ptm-k312-d7 3514801400 1 f04 screw tapping t1 trs 4*10 mfzn 711240...
Page 30: 12. Printed Circuit Board
29 12. Printed circuit board circuit check procedure 1. Low voltage transformer check the low voltage transformer is located on the p.C.B. Measuring condition: input voltage: 230v / frequency: 50hz 2. Voltage check - key check point - check method note 1. Secondary side voltage of the low voltage tr...
Page 31
30 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. 2) when touching m/w button, oven lamp does not turn on and turntable motor does not rotate but cook in...
Page 32
31 4. Case of no heating of upper grill when touching grill or combi button, oven lamp turns on and fan motor and turntable rotate, and cook indicator in display comes on. *cause: relay 3 does not operate. 5. Case of no heating of lower grill when touching temp button, oven lamp turns on and fan mot...
Page 33
32 6. Case of no stopping of the count down timer when the door is opened during operation, the count down timer does not stop. Point state door open door closed a open close b +5v dc gnd a b cn1 d.O.M sw 1 2 35313-0210 d1 1n4148 r1 1k +5v r4 10k c1 104z 7 check no method remedy 1 check the stage(on...
Page 34: 13. P.C.B. Circuit Diagram
33 13. P.C.B. Circuit diagram.
Page 35
34 no name symbol specifcation part code q'ty 1 buzzer bz1 bm-20k 3515600100 1 2 capacitor ceramic c1,c3,c8,c9,c13 104 50v z axial cczf1h104z 5 3 capacitor ceramic c11,c12 473 50v z axial cczf1h473z 2 4 c array ca1 1000pf, 2.54mm cn4xb-102m 1 5 capacitor electro ec2 10v rss 470uf cexf1a471v 1 6 capa...
Page 36
S/m no.:c621q0s001 daewoo electronics co., ltd. 686, ahyeon-dong mapo-gu seoul, korea c.P.O. Box 8003 seoul, korea telex: dwelec k28177-8 cable: “daewooelec” http://www.Daewoo.Co.Kr printed date: dec. 2001.