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Service Manual
Microwave Oven
Model :KOG-36052S KOG-36152S KOG-36252S KOG-36352S KOG-36452S
DAEWOO ELECTRONICS CO., LTD.
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 microwave source, and make repairs as necessary: (1) Interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse. (c) Before turning on microwave power for any service test or inspection within the microwave generating compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connection. (d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before the oven is released to the owner. (e) A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven prior to release to the owner.
TABLE OF CONTENTS
PROPER USE AND SERVICE PRECAUTIONS SPECIFICATIONS FEATURES DIAGRAM INSTALLATION OPERATION MEASUREMENT OF THE MICROWAVE OUTPUT POWER MICROWAVE RADIATION TEST WIRING DIAGRAM CIRCUIT DESCRIPTION PRECAUTIONS FOR DISASSEMBLY AND REPAIR DISASSEMBLY AND ASSEMBLY INTERLOCK MECHANISM TROUBLE SHOOTING GUIDE COMPONENT TEST PROCEDURE SAFETY INTERLOCK CONTINUITY TEST EXPLODED AND PARTS LIST 3 4 5 6 7 8 9 10 12 14 15 21 23 25 26 27
2
CAUTION : This Device is to be Serviced Only by Porperly Qualified Service Personnel. Consult the Service Manual for Proper Service Procedures to Assure Continued Compliance with the Federal Performance Standard for Microwave Ovens and for Precautions to be Taken to Avoid Possible Exposure to Excessive Microwave Energy.
PROPER USE AND SERVICE 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 trained service personnel should make repairs.) 1) 2) 3) 4) 5) A broken door hinge. A broken door viewing screen. A broken front panel, oven cavity. A loosened door lock. A broken door lock.
The door seal area and oven cavity surface be kept clean. No grease, soil or spatter should be allowed to build up on these surfaces or inside the oven. DO NOT ATTEMPT TO OPERATE THIS APPLIANCE WITH THE DOOR OPEN. The microwave oven has concealed switches to make sure the power is turned off when the door is opened. Do not attempt to defeat them. DO NOT ATTEMPT TO SERVICE THIS APPLIANCE UNTIL YOU HAVE READ THIS SERVICE MANUAL. 2. For Safe Service Procedures. 1) If the oven is operative prior to servicing, a microwave emission check should be performed prior to servicing the oven. 2) If any ascertained oven unit is found to have excessive emission level 5mW/cm2, the service person should: (a) inform the manufacturer, importer or assembler, (b) repair the unit at no cost to the owner, (c) attempt to ascertain the cause of the excessive leakage, (d) tell the owner of the unit not to use the unit until the oven has been brought into compliance. 3) If the oven operates with the door open, the service person should tell the user not to operate the oven and contact the manufacturer immediately.
CAUTION MICROWAVE RADIATION PERSONNEL SHOULD NOT BE EXPOSED TO THE MICROWAVE ENERGY WHICH MAY RADIATE FROM THE MAGNETRON OR OTHER MICROWAVE GENERATING DEVICE IF IT IS IMPROPERLY USED OR CONNECTED. ALL INPUT AND OUTPUT MICROWAVE CONNECTIONS, WAVEGUIDES, FLANGES, AND GASKETS MUST BE SECURE. NEVER OPERATE THE DEVICE WITHOUT A MICROWAVE ENERGY ABSORBING LOAD ATTACHED. NEVER LOOK INTO AN OPEN WAVEGUIDE OR ANTENNA WHILE THE DEVICE IS ENERGIZED.
3
SPECIFICATIONS
Item POWER SUPPLY MICROWAVE MICROWAVE GRILL COMBINATION MICROWAVE ENERGY OUTPUT MICROWAVE FREQUENCY OUTSIDE DIMENSIONS (WXHXD) CAVITY DIMENSIONS (WXHXD) NET WEIGHT TIMER FUNCTION SELECTIONS MICROWAVE POWER LEVELS Specification 230V~50HZ, SINGLE PHASE WITH EARTHING 1200 W 1050 W 2200 W 800 W 2450 MHz 465X360X274 mm(KOG-36050S/36150S) 290X290X220mm 14.5 Kg 35 min. DUAL SPEED MICROWAVE/GRILL/COMBINATION 3 LEVELS
* Specifications subject to change without notice.
465
D
D : KOG-36250s (352mm) KOG-36450s (354mm)
4
274
FEATURES DIAGRAM
2
4
12
13
1
9 3 10
11
5
8
6
14
7
¤ Saftey Interlock System. ¤L Door Viewing Screen - Allows viewing of food, the screen is designed so that light can pass through, but not the microwave. ¤Ø Door Hook - When the door is closed, it will automatically shut. If the door is opened while the oven is operating, the magnetron will immediately stop operating. ¤OE Oven Cavity ¤º Door Seal - Door seal maintains the microwave energy within the oven cavity and prevents microwave leakage. ¤ Glass Cooking Tray - Made of special heat resistant glass. Food in a proper receptacle is placed on this tray for cooking. ¤ Roller Guide - This must always be used for cooking together with the glass cooking tray. ¤ Coupler - this fits over the shaft in the center of the oven's cavity floor. This is to remain in the oven for all cooking. ¤ Knob V.P.C - Used to select a microwave power level. ¤ Knob Timer - Used in setting cooking time for all functions. ¤æ Door Release Button - By pushing this button the latch system cut off all circuits and stops the oven before the door is opened. ¤ Reflector (Insulator Heater) ¤ Heating Element ¤ Metal Rack
5
INSTALLATION
1. Steady, flat location. This microwave oven should be set on a steady, flat surface. 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 oven 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, or antenna, feeder and so on. 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. Use a receptacle that will accept the earth prong. · Voltage Warning The voltage used must be the same as specified on this Microwave 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 Microwave Oven will a voltage or amperage fuse other than those specified. · Power supply cord is about 1.0 meters long. Do not use an extension cord. If the supply cord is damaged, it must be replaced by the manufacturer or its service agent or a similarly qualified person in order to avoid a hazard; CAUTION : Do not under any circumstances cut or remove the round earthing prog from this pulg. CAUTION : Maintenances works like the replacing of the power cable must be made by a technician qualified of the after-sales-services. WARNING : This appliance must be earthed. IMPORTANT This wires in this mains lead are coloured inaccordance with the following code. Green-and-yellow : Earth Blue : Neutral Brown : Live As the colours of the wires in the mains lead of this appliance may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows: The wire which is coloured green-and-yellow must be connected to the terminal in the plug which is marked with the letter `E' or by the earth symbol or green-and-yellow. The wire which is coloured blue must be connected to the terminal which is marked with the letter `N' or coloured black. The wire which is coloured brown must be connected to the terminal which is marked with the letter `L' or coloured red. 6. Examine the oven after unpacking for any damage such as: Dents, A misaligned door, Broken door, A dents in cavity. If any of the above are visable, do not install this oven.
6
OPERATION
1. Connect the mains lead to an electrical socket-outlet. 2. After placing the food in a suitable utensil, open the oven door and put it on the glass turntable, Glass turntable must always be in place during cooking. In case the oven is operated in the grill mode, use the Metal Rack and place food on the metal Rack. 3. Shut the door. Make sure that it is firmly closed. 4. How to set each function. To set MICROWAVE Cooking. · Set the variable POWER SELECTOR to desired power level. SYMBOL POWER LEVLE DEFORST MED-HIGH HIGH POWER 33% 77% 100%
To set GRILL Cooking · Set the POWER SELECTOR to the (gril) position. To set COMBI Cooking · Set the POWER SELECTOR to the (combi) position. 5. Set the time control by turning the timer knob and then the oven operate inselected cooking mode. If turing the timer knob for less than 2 minutes, turn it past 2 minutes and then back to the desired time. 6. The oven will be turned off automatically when the timer point to "OFF". Then take out foods. · To prevent the oven operating with the door open, your is fitted with safety door interlock switches. If you wish to inspect the food during the cooking time, simply open the door. The oven will auto matically stop the cooking. To continue cooking, you simply close the door. · If you wish to sotp the cooking during the cooking simply turn the timer knob the point "OFF" Cooking can be reset at any time during the cooking cycle by only turning the timer knob. · Do not let the timer continue to operate after removing food.
7. NOTE : When using the GRILL (KOG:368(9)OS) mode;
· Do not open the door so often, the temperature inside the oven decrease and the cooking may not complete in setting time. · Never touch the oven window and metal interior of the oven when taking food in and out, because of the temperature inside the oven and door is very high. · When using these modes, be careful as the tray will be hot to touch, use oven gloves or pot holders while handling tray.
COOKING UTENSILS
Before use, the user should check that tensils are suitable for use in microwave ovens.
Material
Glass (general) Glass (heat resistant) Glass-ceramic and ceramic(heat resistnat) Earthenware China(heat resistant) Plastic(general) Plastic(heat resistant) Aluminium foil containers/aluminium foil Metal baking tins Metal (pots. pans, etc) Paper
Grill cooking
NO Yes Yes Yes Yes No Yes(2) Yes Yes(4) Yes No
Microwave cooking
Yes(1) Yes Yes(1) Yes Yes Yes(2) Yes(2) Yes(3) No No Yes
1. Without metal parts or metal trims. 2. Some plastics are heat-proof only to certain temperatures. Check carefully! 3. It is possible to use aluminium foil to shield delicate areas of food (this prevents over-cooking). 4. Metal tins can be used in the combination methods, however if these are very deep, they will greatly reduce the efficiency, as metal shields the microwave energy from the food.
7
MEASUREMENT OF THE MICROWAVE OUTPUT POWER
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 oven supplied at rated voltage and operated at its maximum microwave power setting with a load of 1,000±5cc of potable water. 2. The water is contained in a cylindrical borosilicate glass vessel having a maximum material thickness of 3 mm and an outside diameter of approximately 190 mm. 3. The oven and the empty vessel are at ambient temperature prior to the start of the test. The initial temperature of the water is 10±2°C(50±3.6°F). It is measured immediately before the water is added to the vessel. After addition of the water to the vessel, the load is immediately placed on the center of the shelf which is in the lowest normal position. 4. Microwave power is switched on. 5. Heating time should be exactly 52 seconds. Heating time is measured while the microwave generator is operating at full power. The filament heat-up time for magnetrons is not included. 6. The initial and final water temperatures are selected so that the maximum defference between the ambient and final water temperature is 5K.
Water Load
Tray
7. The microwave power output P in watts is calculated from the following formula: P = 4187 X T/t · T is actual temperature rise. · t is the heating time. The power measured should be 800W±10%.
CAUTION : 1. Water load should be measured exactly to 1 liters. 2. Input power voltage should be exactly 230 volts as specified. 3. Ambient temperature should be 20±2°C (68±3.6°F)
8
MICROWAVE RADIATION TEST
WARNING · Make sure to check the microwave leakage before and after repair or adjustment. · Always, start measuring of an unknown field to assure safety for operating personnel from microwave energy. · Do not place your hands into any suspected microwave radiation field unless the safe density level is known. · Care should be taken not to place the eyes in direct line with the source of microwave energy. · Slowly approach the unit under test until the radiometer reads an appreaciable microwave leakage from the unit under the test.
Procedure A) Prepare Microwave Energy Survey Meter, 600cc glass beaker, glass thermometer 100°C or 212°F. B) Pour 275cc±15cc of tap water initially at 20±5°C(68±9°F) in the 600cc beaker with an inside diameter of approx. 9.5cm (3.5 in). C) Place it at the center of the tray and set it in a cavity. D) Close the door and operate the oven. E) Measure the leakage by using microwave energy survery meter with dual ranges, set to 2450 MHz. - Measured radiation leakage must not exceed the values prescribed below. · Leakage for a fully assembled oven with door normally closed must be less than 4mW/cm2. - When measuring the leakage, always use the 2 in (5cm) space cone with probe. Hold the probe perpendicular to the cabinet, door. Place the space cone of the probe on the door, cabinet, door seam, door viewing screen, the exhaust air vents and the suction air vents. - Measuring should be in a counter-clockwise direction at a rate of 1 inch/sec. If the leakage of the cabinet door seam is unkow, move the prove more slowly.
- When measuring near a corner of the door, keep the probe perpendicular to the areas making sure the probe end at the base of the cone does not get closer than 2 inches from any metal. If it does, erroneous reading may result.
9
WIRING DIAGRAM(SLOW ACTING RELAY)
10
WIRING DIAGRAM
11
CIRCUIT DESCRIPTION
1. When the food is placed in the oven cavity and door is closed. · The contact of the interlock monitor switch open (NO). · The contacts of the primary interlock switch and secondary interlock switch close.
15A Fuse 12A Fuse
Primary Interlock Switch
Timer Switch NO
COM Interlock Monitor Switch
NC TM Secondary Interlock Switch CL GM FM
TM Timer Motor
CL Cavity Lamp
GM Geared Motor FM
Fan Motor
Fig. 1
2. When the timer is set to the time desired. · The contact of the timer switch close. · Oven lamp turn on. · 230V AC is applied to the high voltage transformer. · Turntable motor start rotating and glass tray rotating. · Fan motor rotating and cools the magnetron by blowing air. · Timer motor operating and point to passing cooking time. · 3.3 Volts AC is generated from the filamente winding of the high voltage transformer. This filament voltage is applied to the magnetron to heat the magnetron filament through two noise preventing choke coils. · A high voltage of 2000 Volts AC is generated in the secondary of high voltae transformer and this secondary voltage is increased by the action of the diode and the charging of the high voltage capacitor. This resultant D.C voltage is then applied to the anode of the magnetron. As shown in Fig. 2 the first half cycle of the high voltage produces in the high voltage transformer secondary charges the high voltage capacitor. Current flow is in the direction of the dotted-line during the second half cycle, the voltage produced by the transformer secondary, and the charge of the high voltage capacitor are combined and applied to the magnetron as shown by the solid line so that oscillations begins. The disturbance wave generated by the magnetron is prevented by the choke coils of 1.5µH, filter capacitors of 500pF and the magnetron's shielded case so that TV and radio programs are not impired by noise.
12
HIGH VOLTAGE TRANSFORMER
RD H.V FUSE
RD
H.V. CAPACITOR
MAGNETRON H.V. DIODE
Fig.2
3. When the door is opened during cooking. · Primary interlock switch and secondary interlock switch open to cut off the primary voltage to the high voltage transformer to stop microwave oscillation. · Fan motor, timer motor and turntable motor stop rotating. · Oven lamp turn off. · As soon as the door is opened, monitor switch close(NC) to create the short circuit. If the contacts of primary interlock switch and secondary interlock switch are both malfunction, the 15A fuse blows open due to the large current surge caused by monitor switch activation.
13
PRECAUTIONS FOR DISASSEMBLY AND REPAIR
Cautions to be observed when trouble shooting. Unlike many other appliances, the microwave oven is a 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 danger from a short circuit. You are asked to observe the following precautions carefully. (1) Always remove the power plug from the outlet before servicing. (2) Use an insulated screwdriver and ware rubber gloves when servicing the high voltage side. (3) Discharge the high voltage capacitor before touching any oven components or wiring.
1. Check the earthed. Do not operate on a two wire extension cord. The microwave oven is designed to be used with earthed. It is imperative, therefore, to makes sure it is earthed properly before begining repair work.
2. Warning about the electric charge in the high voltage capacitor. For about 30 seconds after the operation stopped, and electric charge remains in the high voltage capacitor. When replacing or checking parts, short between oven chassis and the negative high terminal of the high voltage capacitor, by using a properly insulted screw driver to discharge.
(4) When the 15A fuse is blown out due to the operation of the monitor switch; replace primary, secondary interlock switch and monitor switch. Refer to next page for the necessary adjustment. (5) After repair or replacement of parts, make sure that the screws are properly tightened, and all electrical connections are tightened. (6) Do not operate without cabinet.
CAUTION : Service personnel should remove their watches whenever working close to or repairing the
magnetron.
WARNING : When servicing the appliance, need a care of touching or replacing high potential parts
because of electrical shock or exposing microwave. These parts are as follows-H.V. Transformer, Magnetron, H.V. Capacitor, H.V. Diode.
14
DISASSEMBLY AND ASSEMBLY
1. To remove cabinet. Remove three screws on cabinet back.
2. To remove door assembly. 1) Remove two screws ¤ which secure the stopper hinge top. 2) Remove the stopper hinge top ¤L and door assembly ¤Ø from top plate of cavity. 3) Remove the stopper hinge top ¤Lfrom door assembly. 4) Reverse the above for reassembly taking care to replace fixing glue.
1 3
NOTE : After replacing the door preform a check
of correct alignment with the hinge and cavity front face.
2
3. To remove door parts.
6
3 Door Plate
2
1
4
5
15
(1) Remove the gasket door ¤ from door plate. (2) Remove the barrier screen inner ¤Lfrom door plate. (3) Remove the door frame ¤Øfrom door plate. (4) Remove the spring ¤ºand the hook ¤OE . (5) Remove the barrier screen outer ¤ from door frame ¤Ø . (6) Reverse the above steps for reassembly. 4. Method to reduce the gap between the door seal and the oven front surface. (1) To reduce gap located on part `A' 1) Loosen two screws on stopper hinge top, and A then push the door to contact the door seal to oven front surface. 2) Tighten two screws.
D
B
C
(2) To reduce gap located on part `B'. 1) Loosen three screws on bottom hinge, and then the door to contact the door seal to oven front surface. 2) Tighten three screws. (3) To reduce gap locatated on part `C'. (See Fig. A) 1) Loosen a screw on the interlock switch assembly located at the bottom of the oven body. 2) Draw the interlock switch assembly inward as possible to engage with hook on the door bottom. 3) Tighten a screw. (4) To reduce gap located on part `D'. (See Fig. B) 1) Loosen a screw on the interlock switch assembly located at the top of the oven body. 2) Follow step (3) 2) and 3).
Secondary interlock switch
Hook
Mounting screw Hook Primary interlock switch Primary interlock switch
Mounting screw
Fig. A
Fig. B
NOTE: A small gap may be acceptable if the microwave leakage does not exceed 4m W/cm2.
16
5. To remove control panel parts. (1) Remove the screw which secure the control panel, push up two snap fits and draw forward the control panel assembly.
w q 0 6 7 r e 9
t
3
8
5 1
2
4
(2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12)
Remove the door open lever ¤ºfrom the control panel ¤OE . Remove two screws ¤iwhich secure the timer assembly ¤ . Remove the timer assembly ¤ . Pull out the timer knob ¤ from the timer assembly ¤ . Pull out the timer coupler ¤ from the timer assembly ¤ . Remove the screw ¤ pull out the switch micro ¤ . Remove the screw ¤æwhich secure the V.P.C. coupler ¤ . Pull out the V.P.C couple ¤ and V.P.C knob ¤Ø from the control panel ¤OE . Remove the screw ¤ pull out the switch micro ¤ . Remove the door open button ¤ and button spring ¤Lfrom the control panel ¤OE . Reverse the above steps for reassembly.
17
6. To remove high voltage capacitor. (1) Remove a screw ¤ which secure the grounding ring . terminal of the H.V. diode ¤L and the capacitor holder ¤Ø (2) Remove the H.V. diode ¤L from the capacitor holder ¤Ø . (3) Reverse the above steps for reassembly.
1 3
2
High voltage circuit wiring
Magnetron
H.V. Capacitor
H.V. Diode
H.V. Transformer
7. To remove magnetron. (1) Remove three screws ¤ which secure the magnetron ¤L . (2) Remove the magnetron ¤L . (3) Reverse the above steps for reassembly.
18
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/cm2 for a fully assembled oven with door normally cosed.
Metallic gasket plate
Magnetron antenna
Wave Guide
Magnetron Antenna
Cooling fin Magnetron Filament terminal
Metallic Gasket Plate
8. To remove fan motor assembly.
(1) Remove two screws ¤ which secure the back cover ¤Lfrom the cavity outer. (2) Remove two screws ¤Øwhich secure the fan motor ¤OEfrom the back cover ¤L . (3) Pull out the fan ¤º from the motor ¤OE . (4) Reverse the above steps for reassembly.
1
3 5 4
1 2
9. To remove transformer.
(1) Remove the four screws ¤ holding the H.V. transformer ¤L . (2) Remove the transformer ¤L . (3) Reverse the above steps for reassembly.
2
1
19
10. To remove insulator Heater assembly. (1) Remove the four HEX Nuts ¤ . . (2) Remove the Insulator Heater assembly ¤L (3) Reverse the above steps for reassembly.
1
2
11. To remove Heater Part. 7
TOP PLATE
4
6 1 5 2 3
NO 1 2 3 4 5 6 7
PART NAME INSULATOR HEATER HEATER SCREW MACHINE NUT HEX SCREW MACHINE SPACER INSULATOR*I NUT HEX
PART CODE 3513301100 3512801700 7002500613 7392500008 7002400413 3515000700 7S627W50X1
Q'TY 1 1 1 1 2 2 2
DESCRIPTION SPP T0.8 230V 1000W TRS 5X6 MFCR 6N-2-5 SUS TRS 4X4 MFCR C3771BD FLG NUT M5X0.8P MFZN
REMARK
(1) Remove the HEX Nut ¤OE . (2) Remove the Insulator Heater ¤ and Heater ¤L . (3) Remove the two screws ¤º . (4) Reverse the above steps for reassembly.
20
INTERLOCK MECHANISM
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 switch When the door is closed, the hook locks the oven door. If the door is not closed properly, the oven will not operate. When the door is closed, the hook pushes the button of the micro switch. Then the button of the primary interlock switch bring it under on condition.
Latch Mounting screw
Button
Hook Primary interlock switch
ADJUSTMENT 1. When the door is closed, the switch button is pushed by the hook. The movement of the switch button should exceed 1.2mm measured at the top of the button.
1.2mm
21
(2) Secondary interlock switch and interlock monitor switch When the door is closed, the hook pushes the push lever down ward, the push lever presse the button of the monitor interlock switch to bring it under "off", condition and presses the button of the secondary interlock switch to biring it under "on", condition.
Interlock Monitor Swtich Secondary Interlock Switch Hook Push Lever
ADJUSTMENT 2. Interlock monitor switch When the door is closed, the interlock monitor switch should be opened before other switched close. When the door is opened, the interlock monitor switch should be closed after other switched open. Secondary interlock switch The movement of the switch button should exceed 1.2mm measured at the top of the button. (3) Adjustment steps a) Loosen the two mounting screws. b) Adjust interlock switch assembly position. c) Confirm the gap(1.2mm) described above. d) Make sure that push lever moves smoothly after adjustments is completed. e) Completely tighten the two mounting screws. NOTE : Microwave emission test should be performed after adjusting interlock machanism. If the microwave emission exceed 4mW/cm2, readjust interlock mechanism.
(4) Interlock switch resplacement Whenever safety interlock switch are replaced : 1) Refer to the following diagram. 2) Check the connection of monitor switch after replacement. 3) Perform the electrical continuity check of interlock switches and microwave emission test mentioned in this manual.
Secondary Interlock Switch Interlock Monitor Switch Primary Interlock Switch
RD WH
WH BL WH BK RD RD RD WH
SYMBOL RD WH BK BL
COLOR RED WHITE BLACK BLUE
22
TROUBLE SHOOTING GUIDE
Trouble Door shut, timer set but no cooking takes place. 1)
Does the fan motor work when you shut the door and turn the timer? NO NO Does 12A fuse blow? NO continuity
YES Replace primary interlock switch, secondary interlock switch and interlock monitor switch. *All these switches must be replace at the same time.
Check continuity of interlock monitor switch with door shuted.
continuity
Replace fuse
Both continuity
Check continuity of both interlock switch's contact and monitor switch's contact with door partially open until monitor switch contact closes.
Both no continuity
Replace primary, secondary interlock switch and interlock monitor switch.
One is continuity The other is not.
Replace primary, secondary interlock switch and interlock monitor switch.
Disconnect one side of the lead wire connected from transformer to the high voltage capacitor, and operate oven.
Normal
Replace high voltage Capacitor.
Fuse again blows
Replace high voltage transformer NO continuity
Outlet has Proper voltage
Check continuity of H.V.T. Thermal cut-out.
Replace H.V.T. Thermal cut-out
Check continuity of power supply cord.
NO continuity
Replace Power supply cord.
23
2)
Does the fan motor when you shut the door and turn the timer? YES Does the oven lamp light? Does the turntable turn? YES NO microwave oscillation. Check the relay contact of slow acting relay ass'y NO operate Replace slow acting relay ass'y NO Replace or repair oven lamp, turntable motor.
*After short the contacts of a relay, operate oven. operate Check continuity of filament of magnetron NO continuity Replace magnetorn
*Do not operate when you check this continuity. Check continuity filament tap (3.3V) of high voltage transformer. NO continuity Replace high voltage transformer
Check continuity of filament of magnetron.
NO continuity
*Normal reading should be approx. 0. Check the diode for continuity in the reverse and normal directions. continuity in the reverse direction Replace high voltage diode.
Poor continuity
*Meter with 6V or higher voltage batteries should be used to check the normal direction resistance of the diode.
NO GOOD
Replace high voltage transformer
Check the isolation of filament winding of high voltage transformer
GOOD Faulty magnetron
Replace Magnetron
24
COMPONENT TEST PROCEDURE
1. High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle. 2. It is neither necessary nor advisable to attempt measurement of the high voltage. 3. Before touching any oven components or wiring, always unplug the oven from its power source and discharge the capacitor (see page 14). 1. High voltage transformer (A) Remove connections from the transformer terminals and check continuity. (B) Normal readings should be as follows: Secondary winding........Approx. 120 ¡ 10% Filament winding ...........................Approx. 0 Primary winding.............................Approx. 0 2. High voltage capacitor (A) Check continuity of capacitor with meter on the highest OHM scale. (B) A normal capacitor will show continuity for a short time, and then indicate 9M once the capacitor is charged. (C) A shorted capacitor will show continuous continuity. (D) An open capacitor will show constant 9M. (E) Resistance between each terminal and chassis should be infinite. 3. High voltage diode (A) Isolate the diode from the circuit by disconnecting the leads. 5. Interlock monitor switch The interlock switch can be checked with an ohmmeter. Isolate the switch and then connect the meter leads to the common (COM) and normally close (NC) terminals of the switch. The meter should indicate an open circuit with the door closed and a closed circuit with the door opened. In case improper operation is indicated, make the necessary switch adjustment or replacement. 6. Primary and secondary interlock switch The primary and secondary interlock switch can be checked with an ohmmeter. Isolate the switch and connect the meter leads to the common (COM) and normally open (NO) terminals of the switch. The meter should indicate an open circuit with the door opened and a closed circuit with the door closed. In case improper operation is indicated, make the necessary switch adjustment or replacement. (B) With the ohmmeter set on the highest resistance scale, measure the resistance across the diode terminals. Reverse the meter leads and again observe the resistance reading. meter with 6V, 9V or higher voltage batteries should be used to check the front-back resistance of the diode, otherwise an infinite resistance may be read in both directions. A normal diodes resistance will be infinite in one direction and several hundred K in the other direction. 4. Magnetron For complete magnetron diagnosis, refer to "Measurement of the Microwave Output Power". (Page 7) Continuity checks can only indicate and open filament or a shorted magnetron. To diagnose for an open filament or shorted magnetron. (A) Isolate magnetron from the circuit by disconecting the leads. (B) A continuity check across magnetron filament terminals should indicate ohm or less. (C) A continuity check between each filament terminal and magnetron case should read open.
25
SAFETY INTERLOCK CONTINUITY TEST
¥ Disconnect the oven from the power supply. ¥ You can test continuity of safety interlocks and monitor switch by using switch tester or ohmmeter. ¥ The switch operation is checked by the lamp on/off of resistance zero/unlimited. ¥ The sequence of check is interlock monitor switch; primary and secondary interlock switches check. ¥ Make circuits like Fig. a, Fig. b, Fig. c for tests.
1) In case of interlock monitor check. (Lamp on or zero resistance)
PRIMARY INTERLOCK S/W NO COM NC SECONDARY INTERLOCK S/W INTERLOCK MONITOR S/W
2) In case of primary interlock check. (Lamp on or zero resistance)
PRIMARY INTERLOCK S/W NO INTERLOCK MONITOR COM NC S/W SECONDARY INTERLOCK S/W
POWER SUPPLY CORD
POWER SUPPLY CORD
(ohmmeter) Fig. a Condition: 1) Door is opened. 2) Common terminal of the monitor switch disconnected.
(ohmmeter) Fig. b Condition: 1) Door is closed.
N(Schematic diagram of S/W tester) 3) In case of secondary interlock switch. (Lamp on or zero resistance)
PRIMARY INTERLOCK S/W POWER SUPPLY CORD NO INTERLOCK MONITOR S/W NC CONTACT LEAD LAMP S/W
COM
SECONDARY INTERLOCK S/W
BATTERY
(ohmmeter) Fig. c Condition : 1) Door is closed.
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EXPLODED AND PARTS LIST
1. Door Assembly
A1
A2
A3
A4
A5
A6
A7
A8
DOOR ASSEMBLY : 3511706000 (KOG-3605) 3511706010 (KOG-3615/35) 3511706020 (KOG-3625) 3511706030 (KOG-3645)
REF NO A1
A2 A3 A4 A5 A6 A7 A8
PART CODE 3517003010 3517003000 3517003020 3517003030 3512202500 3512202000 3512202010 3512202800 3515201500 3511705500 3517002800 3512300200 3513100700 3515101300
PART NAME BARRIER SCREEN *O
DESCRIPTION
FRAME DOOR STOPPER HINGE *T AS DOOR WELD AS BARRIER-SCREEN* ¥ GASKET DOOR HOOK SPRING HOOK
Q'TY 1 1 PMMA T1.5 1 1 1 1 ABS 1 1 KOR-61150S 1 KOR-61150S 1 POLYESTER T0.1 1 PP 1 POM 1 PW1 1
REMARK KOG-3605 KOG-3615/35 KOG-3625 KOG-3645 KOG-3605 KOG-3615/35 KOG-3625 KOG-3645
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2. Control Panel Ass'y
B12 B11 B7 B16 B6 B10 B14 B13 B9 B15
B3
B8
B1 B2 REF NO B1 PART CODE 3516903610 3516903600 3516903620 3516903630 4416D55061 441B655072 3513402610 3513402600 3513402620 3513402640 3516711400 3516709800 3516709810 3516709820 3513701400 3513701410 4415A66910 7121301511 4415A17352 7121301511 3517400500 7122401211 3517400400 3513402510 3513402500 3513402520 3513402540 3518203800 7122401211 3512764200 B4
B5
CONTROL PANEL ASSEMBLY : 3516713840(KOG-3605) 3516713800(KOG-3615) 3516713810(KOG-3625) 3516713880(KOG-3635) 3516716010(KOG-3645)
PART NAME BUTTON DOOR OPEN
DESCRIPTION ABS SWPA HSWR ABS
B2
BUTTON SPRING
B3
KNOB VPC
B4
CONTRON-PANEL
ABS
B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 B16
LEVER DOOR OPEN SW MICRO SCREW TAPPING SW MICRO SCREW TAPPING COUPLER VPC KNOB SCREW TAPPING COUPLER TIMER KNOB TIMER SCREW TAPPING HARNESS TIMER
POM VP-531A-OF T2S PAN 3X15 MFZN VP-533A-OF T2S PAN 3X15 MFZN POM T2S TRS 4X12 MFZN POM ABS KN35MKD 24E-P T2S TRS 4X12 MFZN KOG-36150S
Q'TY REMARK KOG-3605 KOG-3615/35 1 KOG-3625 KOG-3645 1 KOG-3605 1 KOG-3625/15/35 KOG-3605/35 KOG-3615 1 KOG-3625 KOG-3645 KOG-3605 KOG-3615/35 1 KOG-3625 KOG-3645 1 KOG-3605/15/25/35 1 KOG-3645 1 1 1 1 1 1 1 KOG-3605/35 KOG-3615 1 KOG-3625 KOG-3645 1 1 1
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3. Main Unit
29
PARTS LIST
REF NO. A00 B00 F01 F02 F03 F04 F05 F06 F07 F08 F09 F10 F11 F12 F13 F14 F15 F16 F17 F18 F19 F20 F21 F22 F23 F24 F25 F26 F27 F28 F29 F30 F31 F32 F33 F34 F35 F36 F37 F38 F39 F40 F41 F42 F43 F44 F45 F46 F47 F48 F49 F50 PART NAME DOOR ASS'Y C/PANEL ASS'Y COVER WAVE GUIDE BUTTON LOCKING INSULATOR HEATER AS COUPLER GUIDE ROLLER AS TRAY TRAY RACK AS CABINET SCREW TAPPING SCREW SPECIAL NUT HEX CAVITY AS SCREW TAPPING SCREW TAPPING THERMOSTAT SCREW TAPPING NUT HEX CLAMP POWER CORD CORD POWER AS MAGNETRON SCREW SPECIAL SCREW TAPPING SCREW MATCHINE COVER *B MOTOR SHADED POLE FAN SCREW TAPTITE HOLDER HV CAPACITOR CAPACITOR H.V DIODE H.V. TRANS H.V. SCREW SPECIAL SCREW TAPPING BASE FOOT SCREW TAPTITE STOPPER HINGE *U SCREW TAPPING SW MICRO SW MICRO SW MICRO LEVER LOCK LOCK LAMP NOISE FILTER SCREW TAPPING MOTOR SYNCRO FUSE H.V SLOW ACTING RELAY SCREW TAPPING PART CODE DESCRIPTION EXPLODED AND PART LIST 3511403500 4078502031 3513301400 3517400600 3512510600 3517203600 3517204410 3510801300 7S312X40A1 3516003700 7S627W50X1 3516104810 7122401211 7121300611 3513902200 7112401011 7S627W50X1 4413A90012 35113AAQ95 3518002200 3516002700 7S312X40A1 7601400811 3511402500 3963512100 3511800300 7272400811 3513001900 441U667020 4416V24000 3518106210 3516003700 7112401011 3510308700 3512100900 7272400811 3515201101 7122401211 4415A17352 4415A66910 4415A17352 3513701300 3513805700 3513601600 3518603700 7121400611 3966310100 3518700900 3518570400 7122401211 MICA T0.5 PP KOG-36150S PPS KOR-61150S GLASS KOG-361Q0S 99MM PCM T0.6 T1 TRS 4X10 SE MFZN TT3 FLG HEX 4X8 MFZN FLG NUT M5X0.8P MFZN KOG-36150S T2S TRS 4X12 MFZN T2S PAN 3X6 MFZN OFF:130 ON:115 T1 TRS 4X10 MFZN FLG NUT M5X0.8P MFZN NYLON 66 3X0.75 60X60 120-RTML 2M 218H(MF) I T2S FLG HEX 4X13 SE MFZN T1 TRS 4X10 SE MFZN PAN 4X8 PW MFZN SBHG T0.8 MW10CA-R01 PP+30% GLASS TT3 TRS 4X8 PW MFZN SECC T0.8 2100VAC 0.95uF HVR-1X-32B JY-N80S0-61T TT3 TRS 4X8 MFZN T1 TRS 4X10 MFZN SBHG T0.8 PP DASF-130 TT3 TRS 4X8 MFZN SCP-1 T2.5 T2S TRS 4X12 MFZN VP-533A-OF VP-531A-OF VP-533A-OF POM POM BL 240V 25W T25 DWLF-M T2S TRS 4X6 MFZN GM-16-24FD12 HV-41A 5KV 0.55A #250 DWSR-1 T2S TRS 4X12 MFZN Q'TY 1 1 1 2 1 1 1 1 1 1 3 2 2 1 1 1 1 3 2 1 1 1 3 2 2 1 1 1 1 1 1 1 1 4 5 1 2 2 1 2 1 1 1 1 1 1 1 2 1 1 1 1 REMARKS
for Germany
30
DAEWOO ELECTRONICS CO., LTD.
686, AHYEON-DONG MAPO-GU SEOUL, KOREA C.P.O. BOX 8003 SEOUL, KOREA TELEX: DWELEC K28177-8 CABLE: "DAEWOOELEC" FAX: 02) 360-8184 TEL: 02) 360-8183
http://www.dwe. daewoo.co.kr
S/M NO.:G36052S001
PRINTED DATE: Nov. 1998